Booking a Southwest flight without checking the Southwest Low Fare Calendar first is like buying a car without comparing prices - you might get lucky, but the odds are not in your favor. The Low Fare Calendar shows you the cheapest available fare for every day of the month on your route before you commit to any date. It is free, it takes seconds, and it consistently reveals lower prices than random date selection.
Here is everything you need to know to use it properly in 2026.
The Southwest Low Fare Calendar - What It Is and Why It Exists
The Southwest Low Fare Calendar is a fare comparison feature on southwest.com that displays the lowest available Southwest fare for each day of a selected month on any route. The premise is simple: Southwest's fares are not fixed. They change constantly - sometimes multiple times per day - based on demand, remaining seat inventory, day of week, and how far in advance you are booking.
On a typical Southwest domestic route, the fare difference between the cheapest day of the week and the most expensive can be $80, $100, or $150 or more. Most travelers never see that difference because they search a single date. The Low Fare Calendar eliminates that blind spot entirely by showing the full monthly pricing picture at once.
What you need to know before using it:
- Accessible only at southwest.com - not available on Google Flights or any OTA
- Completely free with no login or account required
- Covers up to 6 months ahead with real-time pricing
- Displays the lowest available fare for every calendar date on your route
- Works for both one-way and round-trip searches
- Updates in real time as seats sell and prices shift
Southwest and Google Flights - The Gap That Costs Travelers Money
Let us address the most important fact in Southwest fare strategy immediately:
Southwest Airlines does not list its fares on Google Flights, Kayak, Skyscanner, Expedia, or any third-party booking platform. Southwest pricing exists only at southwest.com and in the Southwest mobile app.
If you search for domestic US flights exclusively on Google Flights, you are searching an incomplete market. Southwest - which operates thousands of domestic flights daily and frequently offers the lowest fares on competitive routes - is completely absent from your results. You may book what appears to be the cheapest fare on Google Flights while Southwest was offering a significantly lower price on the same route, invisible to you the entire time.
The Low Fare Calendar closes that gap. But only if you go directly to southwest.com to check it.
CheapFareFreak Pro Tip: Set southwest.com as a bookmark alongside Google Flights and treat both as required steps in every domestic US flight search. The five extra minutes of checking Southwest directly has saved travelers $50 to $200 on individual bookings where Southwest was the cheapest option - and completely invisible on every comparison site they checked.
How to Use the Southwest Low Fare Calendar - Complete Walkthrough
Step 1 - Open Southwest.com and Enter Your Route
Go to southwest.com on any device. Select one-way or round-trip. Type in your departure and destination airports. Do not worry about dates yet.
Step 2 - Switch to the Low Fare Calendar View
On the search results page, find the "Low Fare Calendar" or "Flexible Dates" option near the date selector. On desktop, it usually appears as a toggle or link near the date field. On mobile, look for a calendar icon or flexible dates option. Tap or click it to switch from the standard date picker to the full monthly fare display.
Step 3 - Read the Full Month
The calendar loads showing the lowest available Southwest fare for each date on your selected route. Cheaper dates are visually distinct from more expensive ones. Do not select a date immediately - scan the entire month first. The lowest-fare date is frequently not the one you originally planned to travel on, and the difference matters.
Step 4 - Advance Through Multiple Months
Use the navigation arrows to move forward month by month. Southwest's booking window extends approximately 6 months ahead. Looking at two or three months at once gives you the clearest picture of when fares are lowest on your route - especially important for summer travel and holiday periods when prices fluctuate significantly across the calendar.
Step 5 - Click Your Target Date and Review Flights
When you identify your target date, click it to see all available Southwest departures for that day. Each flight displays pricing for all four Southwest fare classes. Choose your fare class based on your budget and flexibility needs.
Step 6 - Search Round-Trip Legs Separately
For round-trip travel, do not use the round-trip search to run both legs simultaneously. Instead, run the Low Fare Calendar as two independent one-way searches - one for your outbound leg and one for your return. Searching each direction separately allows you to independently identify the cheapest available date for each leg, which almost always produces a better combined total than the automatic date pairings a round-trip search generates.
Expert Tip: Separate one-way Low Fare Calendar searches for each leg of a round-trip is one of the most consistently effective Southwest booking strategies. The savings per person on a typical route range from $20 to $80 compared to a single round-trip search - purely from optimizing each direction independently.
Southwest Fare Classes - Everything You Need to Know
Southwest offers four fare classes. Understanding each one is essential because the right fare class for your trip depends entirely on how certain your plans are - not just how much you want to spend.
Wanna Get Away Southwest's lowest fare tier. Built for travelers with firm, confirmed plans who are confident they will not need to change or cancel. Non-refundable - cancellations return the ticket value as Southwest travel funds for future bookings, not cash. No change fees apply if you need to move to a different flight. Two free checked bags included on every ticket.
Wanna Get Away Plus A modest step above Wanna Get Away in price with one significant additional benefit: travel funds generated by cancellations are transferable to another Rapid Rewards member. If your plans change and you need to cancel, you can effectively pass the value to a friend or family member rather than keeping it tied to your own account. No change fees. Two free checked bags included.
Anytime Southwest's fully flexible fare. Fully refundable to your original payment method - cancel at any point before departure and receive a complete cash refund. No change fees. The right choice when your travel dates are genuinely uncertain and you need a real safety net. Two free checked bags included.
Business Select Southwest's premium offering. Fully refundable, guaranteed boarding positions A1 through A15 so you board among the first passengers, complimentary premium drink, and the highest Rapid Rewards points earning rate per dollar spent. No change fees. Two free checked bags included. Typically priced 2 to 3 times higher than Wanna Get Away on the same flight.
The distinction that matters most: Southwest charges no change fees on any fare class - but cash refundability varies significantly. Only Anytime and Business Select fares refund your original payment method. Wanna Get Away and Wanna Get Away Plus cancellations create travel funds that expire. If your plans are even moderately uncertain, the price difference between Wanna Get Away and Anytime may be worth it.
Cheapest Days to Fly Southwest - What the Low Fare Calendar Reveals
Scanning the Southwest Low Fare Calendar consistently across domestic routes reveals reliable day-of-week pricing patterns:
Cheapest days to fly Southwest:
- Tuesday - the lowest-fare day on the majority of Southwest domestic routes
- Wednesday - typically within $10 to $20 of Tuesday on most routes
- Saturday - lower demand than Friday or Sunday; competitive midweek pricing on most leisure routes
Most expensive days to fly Southwest:
- Friday - peak outbound day for business and leisure travelers; consistently highest fares especially on afternoon and evening departures
- Sunday evening - return travel peak; frequently the single most expensive departure window of the week
- Monday morning - business outbound surge with elevated pricing across Southwest's major business routes
Why this matters in practice: On a moderately busy Southwest route - Baltimore to Denver, Dallas Love Field to Chicago Midway, Las Vegas to Los Angeles - the fare gap between Tuesday and Friday can be $80 to $120 per person. A family of four flying round-trip, choosing Tuesday over Friday both ways, can save $640 to $960 on the same trip by adjusting travel dates by two to three days. The Low Fare Calendar makes identifying that opportunity instant.
Setting Southwest Fare Alerts - Two Methods That Work
The Low Fare Calendar shows current pricing at the moment you check it. Fares change constantly. To track price movements on your target route without manually checking every day, use one of these two methods:
Southwest.com built-in fare alerts: After searching your route on southwest.com, look for the "Price Alert" or "Notify Me" option on the results page. Enter your email address and Southwest will send a notification when the fare drops on your saved route and dates. Direct from Southwest's system - the most accurate alert for Southwest-specific fare drops.
Hopper app - best third-party Southwest tracker: Google Flights price alerts do not capture Southwest fare changes because Southwest does not participate in Google's flight data. Hopper tracks Southwest fares directly and sends push notifications when prices change on saved routes. It covers Southwest alongside other airlines in a single interface - making it the most practical tool for travelers who want to monitor multiple carriers including Southwest in one place.
The cardinal rule of fare alerts: When an alert fires at a price you are ready to pay - book immediately. Do not wait. Southwest low fares are not held for you. A Wanna Get Away fare available when your alert fires may be gone within hours on a popular route. If the price fits your budget and the dates work - book it now.
Advanced Strategies to Save More With the Southwest Low Fare Calendar
Run Total Cost Comparisons - Not Headline Fare Comparisons
Southwest includes 2 free checked bags per passenger on every ticket across every fare class. This single benefit fundamentally changes how Southwest fares compare against competing airlines once bags are factored in.
Concrete example: Southwest Wanna Get Away at $179 versus United at $139 with a $35 carry-on fee and $45 checked bag fee round-trip. The United headline fare is $40 cheaper. The United total cost with one checked bag round-trip is $219 - making Southwest $40 cheaper in total. Running this calculation takes sixty seconds and frequently reverses what looks like an obvious fare comparison. Always calculate total cost including all applicable fees before deciding.
Check Every Southwest Airport Near Your Departure City
Southwest operates from multiple airports in most major US metros. Pricing varies between them. Always run Low Fare Calendar searches from every Southwest-served airport in your area:
- Dallas: Love Field (DAL) and Dallas Fort Worth (DFW)
- Los Angeles: LAX, Burbank (BUR), Long Beach (LGB)
- Chicago: Midway (MDW) and O'Hare (ORD)
- Houston: Hobby (HOU) and George Bush Intercontinental (IAH)
- Washington DC area: Reagan National (DCA), Dulles (IAD), BWI
Pricing between nearby airports on the same travel date can vary by $40 to $100. The extra search takes two minutes and occasionally saves significantly more than that.
Book Summer and Holiday Travel During the Initial Release Window
Southwest releases booking availability in batches - typically up to 6 months ahead. For high-demand periods - summer, Thanksgiving, Christmas, spring break - fares are generally lowest when first made available and rise as seats fill. The optimal booking strategy for peak travel: check southwest.com as soon as the target travel dates fall within the 6-month booking window and book immediately if the Low Fare Calendar shows an acceptable price.
Use Rapid Rewards Points on High-Fare Calendar Dates
Southwest Rapid Rewards points are priced in direct proportion to the cash fare - meaning points deliver the same value per dollar whether you redeem on a $79 Tuesday fare or a $189 Friday fare. When the Low Fare Calendar shows elevated pricing on your target dates, burning Rapid Rewards points is as valuable as using them on the cheapest calendar dates. Strategic approach: pay cash on low-fare dates, redeem points on high-fare dates.
The Companion Pass Multiplier Effect
Southwest's Companion Pass allows a designated companion to fly free on every Southwest flight you take - both paid and award bookings - for the duration of the pass. Paired with the cheapest dates on the Low Fare Calendar, the Companion Pass effectively delivers two tickets for the price of one on every booking you make. On a route with a $150 Tuesday Wanna Get Away fare, the Companion Pass makes that $300 round-trip for two people. It is the highest-value single travel benefit available on any domestic US airline.
Frequently Asked Questions
How does the Southwest Low Fare Calendar work?
The Southwest Low Fare Calendar works by connecting to Southwest's real-time booking inventory and displaying the lowest available fare for each calendar date on your selected route. Every date shows the actual bookable price - not an estimate - for the cheapest Southwest fare class available that day. The display updates continuously as seats sell and prices change throughout the day.
Can I book directly from the Southwest Low Fare Calendar?
Yes. Once you identify your target date on the Low Fare Calendar and click it, you are taken directly to Southwest's booking flow for that date. You select your preferred flight time and fare class and complete the booking on southwest.com. The Low Fare Calendar is a fully integrated feature of Southwest's booking system - not a separate tool.
Does the Southwest Low Fare Calendar show all fare classes?
The Low Fare Calendar displays the lowest available fare class for each date - typically Wanna Get Away when available. Once you click a date and view available flights, you will see pricing for all four fare classes (Wanna Get Away, Wanna Get Away Plus, Anytime, Business Select) for each departure time. The calendar view itself shows the floor price - clicking through reveals the complete fare class range.
What does it mean when a date shows no fare on the Southwest Low Fare Calendar?
If a date shows no fare or appears greyed out on the Low Fare Calendar, it typically means no flights are available on that route for that date, the date is outside Southwest's current booking window, or all available inventory for that date has sold out. It does not necessarily mean Southwest does not serve the route - it may mean that particular date is unavailable or not yet released.
Is the Southwest Low Fare Calendar the same as the flexible dates feature on the app?
The Low Fare Calendar on southwest.com and the flexible dates feature in the Southwest mobile app serve the same function - displaying fare pricing across a range of dates - but the visual layout may differ between desktop and mobile. Both pull from the same real-time Southwest pricing data and will show identical fares for the same route and dates.
Can I use the Southwest Low Fare Calendar for group bookings?
The Southwest Low Fare Calendar is designed for individual bookings of up to eight passengers in a standard search. For groups of ten or more travelers, Southwest has a dedicated Group Travel program that offers separate pricing and booking support. The Low Fare Calendar is not the appropriate tool for large group bookings - contact Southwest's Group Travel team directly for those itineraries.
How does Southwest's no-change-fee policy work with Low Fare Calendar bookings?
Southwest charges no change fees on any fare class booked through any channel including the Low Fare Calendar. If you need to change your flight after booking, you can move to any available Southwest flight on the same route. If the new fare is higher than what you paid, you cover the difference. If the new fare is lower, the difference returns as Southwest travel funds on Wanna Get Away fares or as a cash refund on Anytime and Business Select fares.
Should I always book the cheapest date on the Low Fare Calendar?
Not necessarily. The cheapest date on the Low Fare Calendar is the lowest-cost option but may not always be the best option for your specific trip. A Tuesday departure may be significantly cheaper than Thursday but may also require an early morning flight with a connection when Thursday offers a direct flight at a higher fare. Always review the actual flight options for your target date - departure time, routing, and total travel time - before committing to the cheapest calendar date.
The Bottom Line on the Southwest Low Fare Calendar
The Southwest Low Fare Calendar does one thing exceptionally well: it shows you whether the date you are planning to travel is actually the cheapest option available - or whether shifting by a day or two would save you $50, $100, or more per person. That information, delivered in seconds and completely free, is the difference between guessing and knowing.
Combined with Southwest's no-change-fee policy, 2 free checked bags on every ticket, and competitive pricing on domestic routes - the Low Fare Calendar makes Southwest one of the strongest value options in domestic US air travel for travelers who use it correctly.
Before every Southwest booking:
- Open southwest.com and run the Low Fare Calendar for your route
- Scan the full month before selecting any travel date
- Check one to two additional months if your dates are flexible
- Target Tuesday and Wednesday for the lowest available fares
- Search each leg of a round-trip as a separate one-way search
- Check all Southwest-served airports near your departure city
- Add 2 free checked bags to your total cost before comparing against other airlines
- Set a fare alert and book immediately when your target price appears
For side-by-side fare comparisons across Southwest and every major airline, complete total cost breakdowns including all fees, and expert booking guidance for every route - visit CheapFareFreak.com.
Fly Smarter. Spend Less. Book with Confidence.
Southwest Airlines fares, fare class terms, Rapid Rewards program details, baggage policies, Companion Pass terms, and the Low Fare Calendar interface are subject to change without notice. Always verify all current policies and pricing directly at southwest.com before booking.