If you've never used the Southwest Low Fare Calendar, you've been leaving real money on the table. This tool is one of the most underused fare-finding features in all of air travel — and because Southwest doesn't appear on Google Flights or most third-party booking engines, millions of travelers never see their cheapest fares. I've tracked Southwest pricing patterns for over a decade, and the Low Fare Calendar remains the single most effective way to find cheap Southwest flights when you have even a little date flexibility. In this guide, you'll learn exactly how the Southwest Low Fare Calendar works in 2026, how to read it, how Southwest's completely overhauled fare structure affects your booking decisions, and the expert strategies that separate travelers who consistently pay less from those who don't.

Quick Facts: Southwest Low Fare Calendar (2026)

Tool Location: southwest.com → click "Low Fare Calendar" below search fields

Booking Window: ~7 months ahead; fares released in batches

Fare Display: Lowest available fare per day, full month view

Current Fare Types: Basic, Choice, Choice Preferred, Choice Extra

Points View: Yes — toggle between $ and Rapid Rewards points

Cheapest Days to Fly: Tuesday, Wednesday, early Saturday

Best Booking Window: 3–8 weeks for domestic routes

Seating: Assigned seating (since January 27, 2026)

Checked Bag Fees: $45 first bag / $55 second bag (as of April 2026)

Carry-On Bags: Free on ALL fare types

No Change Fee: Still applies on Choice, Choice Preferred, and Choice Extra

What Is the Southwest Low Fare Calendar?

The Southwest Low Fare Calendar is a built-in pricing tool on southwest.com that shows the lowest available airfare for every day of an entire month in a single calendar grid. Instead of searching one date at a time, you see the full picture instantly — the cheapest travel days appear in contrasting colors, expensive dates stand out immediately, and you can shift your trip by a day or two to capture meaningful savings without digging through dozens of search results.

Here's what makes it genuinely valuable versus other tools:

  • It pulls directly from Southwest's live inventory — no third-party markup, no data lag
  • It displays fares in both dollars and Rapid Rewards points simultaneously
  • It covers one-way, round-trip, and multi-city searches
  • It reflects real-time seat availability — what you see is what you can book right now

The calendar is especially powerful for flexible travelers. Shifting a departure by even one or two days on a busy domestic route can save $40–$90 each way. That's real money — and it takes about 60 seconds to spot on the calendar.

How to Access and Use the Southwest Low Fare Calendar in 2026

Step-by-Step Access

  1. Go to southwest.com (the calendar is exclusive to this site — it does not appear on any third-party platform)
  2. On the main flight search widget, enter your departure city and arrival city
  3. Below the date entry fields, click the link that says "Low Fare Calendar"
  4. A new tab opens with the calendar pre-loaded with your cities
  5. Select your departure month (and return month for round-trips)
  6. Adjust passenger count if needed, then click Search
  7. The calendar populates with the lowest available fare on each date

Expert Tip: Southwest releases new booking dates in periodic batches — not as a continuous rolling window. The calendar displays exactly how far out Southwest is currently selling tickets. If your target travel date is beyond the current window, check back regularly. When Southwest opens new dates, they often load discounted fare inventory first — being ready when new dates drop means access to the cheapest buckets before they fill.

Reading the Calendar

  • Low-priced dates display smaller numbers in a highlighted color — these are days with available Basic or Choice fare inventory
  • Higher-priced dates show larger numbers — demand is strong or cheap seat buckets are sold out
  • "No flights" on a specific date means either no Southwest service on that route that day, or all seats are sold out at every fare level

One critical thing to understand: the calendar shows the lowest currently available fare, not the lowest fare that ever existed. If Basic seats on a date are sold out, the calendar shows the next available price — which might be Choice or Choice Preferred. A date showing $179 doesn't mean cheap seats are gone forever; it means they're gone now. Check back in a few days — airlines reload fare inventory periodically as booking patterns shift.

Toggling Between Dollars and Points

Above the calendar, a simple toggle switches the display from cash fares to Rapid Rewards points. Since Southwest uses dynamic points pricing tied directly to cash fares, cheap dates in dollars are always cheap dates in points. A $79 cash fare might show 5,000–5,500 points; a $159 fare on the same route might show 10,000+ points. The calendar makes award travel planning completely transparent without a separate search.

Southwest's Current Fare Structure: What You're Actually Buying in 2026

Southwest operates with four fare tiers in 2026. Understanding each one before you use the Low Fare Calendar ensures you don't accidentally book a fare that costs you more in restrictions than you saved on the base price.

Basic Fare — Lowest Price, Most Restrictive

Basic is Southwest's entry-level fare — the price you typically see first on the Low Fare Calendar on cheaper travel dates.

What Basic includes:

  • Carry-on bag (free — overhead bin access included on all fares)
  • Personal item (free)
  • Seat assigned at check-in, not at booking — you get whatever's left

What Basic does NOT include:

  • Advance seat selection
  • Flight changes (non-changeable after purchase)
  • Cash refundability
  • If you cancel, you may receive a flight credit valid for 6 months only
  • Checked bags: $45 first bag / $55 second bag

When Basic makes sense: You're traveling solo, flying carry-on only, your dates are locked, and the price gap between Basic and Choice is $35 or more.

When to skip Basic: Any group travel, families needing to sit together, bag-checkers, or anyone with even slight itinerary uncertainty.

Choice Fare — The Smart Middle Ground

Choice is the successor to the old Wanna Get Away Plus — it's the sweet spot for most leisure travelers.

What Choice includes:

  • Standard seat selection at booking
  • Transferable Flight Credit if you cancel — someone else in your household or travel group can use the credit
  • Same-day flight change capability
  • No change fee (pay fare difference only if new flight costs more)
  • Flight credit valid for 12 months if cancelled
  • Checked bags: $45 first / $55 second

Best for: Travelers who want a real seat selection and reasonable flexibility without paying for a fully refundable fare.

Choice Preferred Fare — Full Cash Refundability

Choice Preferred (previously Anytime) is for travelers who need maximum flexibility.

What Choice Preferred includes:

  • Fully cash refundable if cancelled at least 10 minutes before departure
  • Preferred seat selection at booking (closer to the front)
  • Same-day confirmed flight changes
  • EarlyBird Check-In included (now matters less under assigned seating but still affects boarding group placement)
  • 12-month transferable flight credit
  • Earns 10 Rapid Rewards points per dollar spent

Best for: Travelers with genuinely unpredictable schedules, last-minute bookers who need guaranteed cash refund capability.

Choice Extra Fare — Premium with Bag Benefit

Choice Extra (formerly Business Select) is Southwest's top tier and the only fare that still includes free checked bags.

What Choice Extra includes:

  • 2 free checked bags — significant value for bag-heavy travelers
  • Extra Legroom seat selection at booking (first rows and exit rows, ~34" pitch)
  • First boarding groups (Groups 1–2)
  • Fully refundable
  • Earns highest Rapid Rewards points per dollar
  • Priority airport perks

Best for: Frequent flyers who check bags and can make the math work. Two free checked bags round-trip saves $200 for a family of four — potentially more than the fare upgrade cost.

Southwest's Assigned Seating: How It Works in 2026

As of January 27, 2026, Southwest uses fully assigned seating — the open boarding system (A/B/C groups based on check-in time) is gone. Here's how it works now:

Three seat types:

  • Extra Legroom — First five rows and exit rows; ~34 inches of pitch; select at booking with Choice Extra or as an add-on
  • Preferred — Standard legroom, closer to the front; available with Choice Preferred and above at booking
  • Standard — Back of cabin; ~31 inches of pitch; included with Choice at booking; assigned at check-in for Basic passengers

Boarding groups: Numbered 1 through 8, replacing the old A/B/C system. Group assignment is based on seat location and fare class, with Extra Legroom passengers boarding in Groups 1–2.

What this means for Low Fare Calendar users: The cheapest Basic fare now comes with a real downside — you don't choose your seat at booking. For solo travelers this is manageable; for families or groups it can be a genuine problem. Budget the cost of upgrading to Choice for seat selection into your total fare calculation.

10 Expert Tips for Getting the Most from the Southwest Low Fare Calendar

Tip 1 — Always Check Southwest Separately

Southwest does not appear on Google Flights, Kayak, Hopper, or most third-party engines. While Expedia and Priceline added Southwest as a distribution partner in 2026, the Low Fare Calendar tool itself is exclusive to southwest.com. If you book anywhere else, you're missing the calendar entirely and likely paying more. Make southwest.com your final check on every domestic flight search.

Tip 2 — Use the Calendar for Date Flexibility, Not Just Price Checking

This is the calendar's most powerful function and the one most travelers underuse. If you're planning a trip and see Friday shows $189 but Thursday shows $109 and early Saturday shows $99 — that's $180 in round-trip savings per person by shifting two days. Most vacation itineraries absorb this easily. The calendar makes this comparison instant. Check the full month before picking your dates.

Tip 3 — Fly Tuesday, Wednesday, or Early Saturday

Midweek pricing patterns on the Low Fare Calendar are consistent and measurable. Business travel demand peaks Monday morning and Thursday/Friday evening — Southwest's yield management system loads higher fare buckets on those departures. Tuesday, Wednesday, and early Saturday morning departures (before 9 AM) consistently show $20–$55 lower fares than equivalent Monday or Friday flights on the same route. This is the single easiest recurring saving in air travel and it costs you nothing to apply.

Tip 4 — Book the Right Fare for Your Situation

The Low Fare Calendar shows you price. What it doesn't show is the full cost of getting the wrong fare. Before booking Basic, ask yourself three questions:

  1. Am I 100% certain of these travel dates?
  2. Am I flying carry-on only?
  3. Am I traveling solo, or is it okay if my group gets split across the cabin?

If the answer to any of these is "no" — pay the extra $20–$40 for Choice. The seat selection and 12-month transferable credit are worth it. Basic fare's 6-month credit expiry and non-changeability have caught many travelers off guard.

Expert Tip: For a family of four, the difference between Basic and Choice is typically $80–$160 round-trip. That buys you four assigned seats together, a one-year credit window if plans change, and same-day change capability. For most families, that's worth it.

Tip 5 — Book 3–8 Weeks Out for Domestic Routes

Southwest loads discount fare inventory in batches, not as a continuous sliding availability curve. For most domestic routes, the pricing sweet spot is 3 to 8 weeks before departure — enough time that Basic and lower Choice seats are still available, but close enough that you're not paying the flat "planning price" airlines charge further out. Inside 7 days, cheap seat inventory on popular routes is typically gone and the calendar shows only Choice Preferred and Choice Extra pricing, making Southwest appear more expensive than it actually is for flexible travelers.

Tip 6 — Watch for Southwest Sale Windows

Southwest runs periodic systemwide sales — typically open for 3–5 days, requiring 21-day advance purchase, and targeting specific travel windows. These sales are announced via email (subscribe at southwest.com) and on their official social channels. When a sale drops, open the Low Fare Calendar immediately — the calendar updates in real-time when sale inventory is loaded, letting you see exactly which dates qualify at the promotional price. The cheapest sale fares sell out within 24–48 hours on popular routes, so speed matters.

Tip 7 — Calculate the True All-In Cost Before Declaring Southwest the Winner

This is the most important tip in the current environment. With checked bag fees now in place, Southwest is no longer automatically the cheapest option for travelers who check luggage. Run this math every time:

Example — Two travelers, one checked bag each, round-trip:

AirlineBase Fare (RT)Bag Fees (RT)Total Per PersonSouthwest Basic$99 × 2 = $198$45 × 2 = $90$288Delta Main Cabin$139 × 2 = $278$35 × 2 = $70$348Spirit (bare fare)$59 × 2 = $118$55 × 2 = $110$228

In this example Southwest beats Delta by $60 but loses to Spirit all-in — but Spirit comes with no seat selection, no changes, and a worse airport experience. The right answer depends on your priorities, but you can only find it by running the actual math. The calendar shows base fares; you have to add the bags yourself.

Expert Tip: If you or any traveler in your group holds a Southwest Rapid Rewards Credit Card, the first checked bag is free for the cardholder on every flight. On a round-trip with one checked bag, that's $90 in savings — enough to offset many annual card fees in a single trip.

Tip 8 — Use Points View for Award Travel Planning

When you toggle the Low Fare Calendar to Rapid Rewards points, you're looking at Southwest's most efficient award search tool. Since points pricing scales directly with cash fares, the cheapest cash dates are the cheapest award dates. Typical point costs for domestic routes in 2026:

  • Short routes (under 500 miles): 3,500–6,000 points one-way
  • Medium routes (500–1,500 miles): 6,000–10,000 points one-way
  • Longer domestic routes: 10,000–18,000 points one-way

Rapid Rewards points are worth approximately 1.3–1.5 cents each based on average cash fare equivalents. If a redemption works out to less than 1.2 cents per point, consider paying cash and banking the points for a higher-value flight. The calendar makes this calculation instant — compare the dollar fare to the point cost before deciding.

Tip 9 — Compare Nonstop vs. Connecting Fares in the Calendar

On routes where Southwest serves both nonstop and connecting itineraries, the Low Fare Calendar shows the cheapest fare available regardless of routing. A $69 calendar date might involve a connection through Dallas or Denver; an $89 date might be nonstop. Always click through to check the routing before booking. For short routes under 2 hours nonstop, the time cost of a connection almost never justifies the savings. For longer routes, the math changes.

Tip 10 — Set Southwest's Own Fare Alerts

Southwest offers email-based fare alerts through southwest.com and the Southwest app. These are the only real-time Southwest fare alerts that exist — no third-party tool tracks Southwest pricing with the same accuracy or speed. Set alerts for your most-traveled routes and you'll receive notifications when fares drop to a target price. Combined with the Low Fare Calendar, fare alerts cover both proactive planning (calendar) and passive monitoring (alerts) without requiring daily manual checks.

Southwest Baggage Fees: Current Rates (April 2026)

ItemFeeWho Gets It FreePersonal itemFreeEveryoneCarry-on bagFreeEveryone — all fare types1st checked bag$45A-List Preferred, Choice Extra, RR Credit Cardholders2nd checked bag$55A-List Preferred, Choice Extra3rd checked bag$100No waiversOverweight (50–100 lbs)$100No waiversOversize (62+ linear inches)$100No waivers

The carry-on advantage survives: Unlike Spirit and Frontier, which charge $39–$79 for overhead bin bags, Southwest includes the carry-on on every single fare — including Basic. For carry-on-only travelers, this remains a meaningful competitive advantage.

Expert Tip: The Southwest Rapid Rewards Credit Card earns its fee back fast for bag-checkers. One free first checked bag per flight for the cardholder means $90 in savings on a single round-trip with one bag. A card with a $99 annual fee pays for itself in slightly more than one trip.

Best Times to Use the Southwest Low Fare Calendar (By Season)

January — Best Value of the Year

Post-holiday demand collapses after New Year's. The Low Fare Calendar in January shows the lowest fares of the year on most domestic routes — regularly $49–$89 one-way. Use this window aggressively for late winter and early spring travel planning.

February–Early March — Solid Value

Fares remain moderate before Spring Break demand builds. Good time to book future travel for May–June before summer pricing locks in.

Mid-March through April — Spring Break Caution

The calendar shows sharp spikes during peak Spring Break weeks. Book 8–10 weeks ahead if these dates are fixed. Any flexibility to shift by one week — before or after the peak — typically saves $60–$100 per person.

May through August — Summer Premium

Elevated fares across the board. The Low Fare Calendar still identifies the best available dates, but the floor is higher — expect $99–$160+ on most popular routes. Tuesday and Wednesday departures continue to show meaningful savings versus Friday and Sunday within this elevated range.

September–October — Shoulder Season Sweet Spot

In years of tracking fares, September consistently produces some of the lowest domestic prices of the entire calendar year. The combination of school resuming, lighter leisure demand, and Southwest loading promotional inventory makes the Low Fare Calendar particularly rewarding in this window. Target September for the best combination of price and manageable crowds at most destinations.

November–December — Holiday Spike

Thanksgiving week and the Christmas–New Year's stretch are the two highest-priced periods of the year on every route. The Low Fare Calendar will show the full extent of the spike clearly. Book 10–12 weeks out if these dates are fixed. The days immediately after Thanksgiving and the first week of January offer sharp price drops as holiday demand ends.

Cancellation and Change Policies: What the Calendar Doesn't Show You

The Low Fare Calendar shows price — it doesn't show flexibility. Here's what each fare type actually allows if your plans change.

Basic Fare

  • Non-changeable after purchase (no same-day changes, no rebooking)
  • Cancel before departure: possible flight credit valid 6 months only
  • No cash refund under any circumstance
  • The no-change-fee Southwest advantage does not apply to Basic

Choice Fare

  • Changes allowed with no change fee (pay fare difference only if new flight costs more)
  • Cancel: Transferable Flight Credit valid 12 months — someone else in your group can use it
  • Not cash refundable
  • Earns 6 Rapid Rewards points per dollar

Choice Preferred Fare

  • Fully cash refundable if cancelled at least 10 minutes before departure
  • No change fees; same-day confirmed changes available
  • 12-month transferable flight credit
  • Earns 10 Rapid Rewards points per dollar

Choice Extra Fare

  • Fully cash refundable
  • No change fees; same-day confirmed changes
  • 2 free checked bags included
  • Highest points earning rate

Expert Tip: Southwest's no-change-fee policy is one of the last genuine differentiators it holds over legacy carriers — but it only applies to Choice and above. If you book Basic expecting Southwest's famous flexibility, you won't get it. Know your fare before you assume.

What to Do When Southwest Changes Your Flight

If Southwest modifies your itinerary after booking, your rights depend on the scale of the change. Per U.S. Department of Transportation consumer protection guidelines, a significant schedule change — generally 3 hours or more on a domestic route — entitles you to either a full refund to your original payment method or rebooking at no charge. Southwest's internal policies often trigger rebooking options for changes smaller than 3 hours as well.

If your flight is changed significantly and you want a refund rather than a credit, say directly to the agent:

"My flight was significantly changed. I'd like a full refund to my original payment method under DOT consumer protection rules, not a travel credit."

The phrase "DOT consumer protection rules" and "original payment method" are the specific triggers that route your request through the correct internal process.

Frequently Asked Questions: Southwest Low Fare Calendar 2026

What is the Southwest Low Fare Calendar?

The Southwest Low Fare Calendar is a built-in tool on southwest.com that displays the cheapest available Southwest fare for every day of a selected month in a single grid view. It covers one-way, round-trip, and multi-city searches, and can show prices in either U.S. dollars or Rapid Rewards points. It's free to use and requires no login.

Why doesn't Southwest show on Google Flights?

Southwest has historically sold exclusively through its own website and app. While Expedia and Priceline were added as Southwest distribution partners in 2026, the Low Fare Calendar tool itself remains exclusive to southwest.com. Always check southwest.com directly for the calendar view and the full range of Southwest pricing.

Does Southwest still offer free checked bags in 2026?

Not universally. Checked bags cost $45 for the first and $55 for the second on Basic, Choice, and Choice Preferred fares as of April 2026. Free checked bags are still available for Rapid Rewards A-List Preferred members, Choice Extra fare passengers, and Rapid Rewards Credit Cardholders (first bag free). Carry-on bags remain completely free on all fares.

Does Southwest have assigned seating in 2026?

Yes. Southwest switched to fully assigned seating on January 27, 2026. The old open boarding (A/B/C groups) is gone. You now select a Standard, Preferred, or Extra Legroom seat at booking depending on your fare class — or receive a seat assignment at check-in if you booked Basic.

What are the cheapest days to fly Southwest?

Tuesday, Wednesday, and early Saturday mornings consistently show the lowest fares on the Southwest Low Fare Calendar for most domestic routes. Monday mornings and Thursday/Friday afternoon and evening departures are typically the most expensive due to business traveler demand.

How far out does the Southwest Low Fare Calendar show prices?

Southwest typically books approximately 7 months in advance, releasing new dates in batches rather than on a continuous rolling schedule. The calendar displays exactly how far forward Southwest is currently selling. Check back regularly for travel beyond the current booking window — new dates often open with discounted inventory.

How much are Southwest Rapid Rewards points worth?

Rapid Rewards points are generally worth approximately 1.3–1.5 cents each when redeemed for Southwest flights. Since Southwest uses dynamic pricing tied to cash fares, the value can vary — midweek flights during off-peak periods tend to yield closer to 1.5 cents per point, while peak-demand dates may yield 1.1–1.3 cents. The Low Fare Calendar in points view shows exactly what you're getting per point before you commit.

Can I use the Southwest Low Fare Calendar for award bookings?

Yes — and it's one of the most efficient award search tools in the industry. Toggle the display from dollars to Rapid Rewards points and the calendar shows the cheapest award dates for the full month in a single view. Since point costs scale with cash fares, the cheapest cash dates and the cheapest award dates are always the same.

What happens if I book Basic fare and need to change my flight?

Basic fare is non-changeable. Unlike Choice and above, which carry no change fee, Basic fare does not allow modifications after the 24-hour risk-free cancellation window. If you cancel a Basic fare before departure, you may receive a flight credit valid for 6 months — not a cash refund. If you have any chance of needing to change your plans, book Choice or above.

Is Southwest still worth booking in 2026 without free bags?

Yes — for the right traveler. Carry-on-only travelers still benefit from Southwest's free overhead bin access (unlike Spirit and Frontier), the no-change-fee policy on Choice and above, and the Low Fare Calendar's date flexibility tool. For bag-checkers, the automatic advantage is gone — you now need to run the all-in math per trip to confirm Southwest is actually cheapest for your specific itinerary. It often still is, but it's no longer automatic.

Expert Summary: Book Southwest Smarter in 2026

Southwest in 2026 is a genuinely different airline than it was two years ago — assigned seating, bag fees, expiring credits, and a completely renamed fare structure. The Low Fare Calendar itself hasn't changed: it's still the best single tool for finding Southwest's cheapest flights, and it's still exclusive to southwest.com, which means travelers who skip it are flying blind.

Here are the three actions to take right now if you're planning a Southwest trip:

Action 1 — Open the Low Fare Calendar first. Before picking your dates, spend 60 seconds on the calendar view. You'll immediately see whether shifting by a day or two saves $40, $60, or more per person.

Action 2 — Add your bags to the total before comparing prices. Southwest's base fare is only part of the story now. Calculate the all-in price including checked bags for every carrier you're comparing — then decide.

Action 3 — Book Choice, not Basic, unless your situation clearly calls for it. The $20–$40 upgrade from Basic to Choice buys seat selection, 12-month credit flexibility, and change capability. For most travelers, that's worth more than the savings.

At CheapFareFreak.com, we track Southwest pricing alongside every major and ultra-low-cost carrier so you always see the real comparison — not just the advertised fare. Compare live fares and set your price alert now at CheapFareFreak.com — and make sure the cheapest flight you find is actually the cheapest flight total.

— Your friends at CheapFareFreak.com | Real fares, honest trade-offs, no fluff.

Current as of July 2026. Southwest Airlines bag fees reflect the April 2026 increase. Fare types, seat categories, and policies verified against southwest.com. Always confirm current fees directly with Southwest before booking.