Finding a cheap flight is not always about discovering some secret code or waiting for a magical Tuesday at 2:17 in the morning.
Sometimes, the biggest savings come from changing your travel date by one day.
That is where the Southwest Airlines Low Fare Calendar can help. I checked Southwest’s current calendar and support information to see what it actually does, what it does not do, and how travelers can use it without getting fooled by a low headline fare.
What is the Southwest Low Fare Calendar?
The Southwest Low Fare Calendar is a date comparison tool. It shows the lowest fare currently available for each day on a specific route. In simple terms, a low fare is the discounted ticket price for a flight, and a bargain airfare does not automatically mean a lower total trip cost.
Southwest describes the results as the lowest “as low as” one-way fare by date and route. The Help Center says the calendar displays the lowest fares available on each day for a month at a time.
This is especially useful when your travel dates are flexible. Rather than searching for one specific departure date, you can compare the entire month to find a better option.
Flight prices can vary widely by day. A Wednesday departure may cost less than a Friday flight, while returning on Saturday could be cheaper than flying home on Sunday. Use the calendar to compare fares before choosing your travel dates.
The important word here is currently. Southwest says fares can change at any time, even while you are shopping.
How to use Southwest’s Low Fare Calendar
The process is pretty simple. You do not need a travel degree or a wall covered in red string.
- Open the Southwest Low Fare Calendar.
- Enter your departure and arrival airports.
- Choose a round trip or one-way search.
- Select your passenger count and travel dates.
- Choose whether you want to view prices in dollars, Rapid Rewards points, or Cash + Points.
- Review the available dates and continue to the flight results.
- Check the fare rules and final price before booking.
Southwest’s booking calendar lets travelers view fares in U.S. dollars, Rapid Rewards points, or Cash + Points. The available payment options may vary based on the search and booking details.
I would start with dollars even if I plan to use points. That gives me a quick look at the cash price. Then I would switch to points and compare the value.
The calendar shows one month at a time
This is worth pointing out because some travel articles make the tool sound more powerful than it is.
Southwest says the Low Fare Calendar shows fares for a month at a time. It is not a permanent year-long pricing chart. It also does not promise that every date in every month will have a bargain.
If I cannot find a good price in the first month, I will check the next month manually. I would also search for one-way flights separately if my schedule allows it. Sometimes the cheapest outbound date and the cheapest return date do not yield the lowest round-trip fare when searched together.
The calendar is most useful when I have some flexibility. If I must fly on a specific Friday afternoon, the calendar cannot force Southwest to offer a cheap fare on that date.
Do not confuse a low fare with a low-cost trip
A low airfare is a good start. It is not the entire travel budget.
I try to look at the full cost of the trip, including the flight, hotel, local transportation, food, activities, baggage, and a little room for surprises. That is the same approach I explain in my guide on how to travel more without spending a fortune.
A $59 flight can look great until the hotel costs twice as much because of the travel dates. A slightly more expensive flight may save money if it avoids an extra hotel night or expensive ground transportation.
This is also where the calendar can help with planning affordable weekend getaways. I can compare the airfare first, then check whether the destination still fits the rest of my budget.
Check the fare type before you celebrate
Southwest currently lists four fare types:
| Fare type | What I would pay attention to |
|---|---|
| Basic | Has more restrictions. Changes require a fare upgrade. Seats are generally assigned at check-in, with exceptions for certain members and cardholders. |
| Choice | Flight changes are allowed, with a fare difference if the replacement flight costs more. |
| Choice Preferred | Flight changes are allowed, with a fare difference if applicable. |
| Choice Extra | Includes more benefits, including two free checked bags under Southwest’s current fare rules. |
The cheapest square on the calendar may be attractive, but I would not book it blindly.
Southwest’s Basic fares can’t be changed unless you upgrade the reservation to Choice, Choice Preferred, or Choice Extra. That restriction matters if your travel plans may change.
Southwest also says that if you buy Choice, you may be able to change to a lower fare later and receive the difference as a Transferable Flight Credit. Tickets that include refundability may qualify for the difference to be refunded to the original form of payment.
Basic fares cannot be changed under the same process. That is a major reason to read the fare details before choosing the cheapest option.
Southwest baggage rules have changed
This is one area where old travel advice can cause problems.
Southwest currently says that every ticketed passenger can bring one carry-on bag and one personal item for free. The carry-on limit is 10 x 16 x 24 inches.
Checked-bag benefits depend on the fare, loyalty status, card benefits, and other qualifications. Under Southwest’s current fare information:
- Basic, Choice, and Choice Preferred fares may have checked-bag fees.
- Choice Extra includes two free checked bags.
- A-List Preferred members receive two free checked bags.
- A-List members and qualifying Southwest Rapid Rewards Credit Card members receive the first checked bag free.
- Weight and size limits still apply.
I would check Southwest’s current baggage and travel fee page before booking. Southwest says it can change the listed pricing, and baggage rules may depend on the ticket and travel dates.
Do not build your budget around the old phrase “two bags fly free for everyone.” That is no longer accurate for every Southwest fare.
Can I change my Southwest flight if the price drops?
Sometimes, yes.
Southwest’s current guidance says passengers who buy Choice, Choice Preferred, or Choice fares pay only the fare difference when changing an upcoming flight. If the new flight costs less, eligible bookings may receive the difference as a Transferable Flight Credit. Some tickets that include refundability may qualify for a refund to the original payment method instead.
Basic fares are different. Southwest says Basic reservations cannot be changed unless the fare is upgraded first.
That means I would be careful about booking Basic just to grab a low price if I expect the fare to drop later. The cheaper ticket may not give me the same rebooking options.
Also, Southwest says travelers should cancel at least 10 minutes before the original scheduled departure time. Missing the flight without taking action can result in lost travel funds or points.
What about the 24-hour cancellation rule?
Southwest’s customer service commitment says travelers can cancel an unchanged reservation without a penalty within 24 hours of the initial booking for a full refund.
The related customer service plan includes an important qualification: the reservation must be made at least one week before the flight’s departure.
That means I would not treat the 24-hour rule as a reason to book carelessly. I would still check the exact terms shown during checkout, especially if the flight is coming up soon or the itinerary has already been changed.
“No cancellation fee” and “automatic cash refund” are not always the same thing. The fare type and timing still matter.
Watch the booking window
When I checked Southwest’s official Low Fare Calendar on August 23, 2026, it showed reservations available through April 5, 2027.
That date will move as Southwest opens more flights for sale. Treat it as a current page detail, not a permanent airline policy.
If your desired dates are not available yet, check the calendar again later. I would also sign up for Southwest emails if I want sale alerts, since Southwest recommends shopping early and checking fares regularly.
My favorite way to use the calendar
I would use the calendar in three passes.
First, I would search my preferred route and scan the month for the lowest prices. Then I would check nearby dates, including midweek departures and returns.
Second, I would compare the cheapest flight dates with the cost of the hotel and transportation. This is where guides such as my Booking.com guide can help with checking hotel rates and cancellation terms.
Third, I would review the fare type, seat rules, baggage cost, and cancellation details. That final check takes a few minutes and can prevent an annoying surprise later.
I would not book a $49 flight simply because the number looks good. I would book it if the date works, the fare rules fit my plans, and the total trip cost makes sense.
Common mistakes to avoid
Before booking, I would avoid these mistakes:
- Assuming the fare shown today will still be available tomorrow.
- Looking only at the flight price and ignoring baggage, hotels, and transportation.
- Choosing Basic without reading the change and seat restrictions.
- Assuming every Southwest passenger receives the same checked-bag benefits.
- Forgetting to compare nearby departure and return dates.
- Missing the cancellation deadline if plans change.
I cover several of these problems in my guide to money mistakes solo travelers make. A cheap flight can still become an expensive mistake if I fail to check the details.
Is the Southwest Low Fare Calendar worth using?
Yes, especially when my dates are flexible.
The calendar gives me a quick way to compare fares across a month, showing whether changing the departure date by one or two days could lower the airfare. It also lets me compare cash prices with Rapid Rewards points.
This is not a guarantee of the lowest possible price forever. It is a snapshot of the fares Southwest currently has available. Prices can change, seats can sell out, and the cheapest fare can come with more restrictions.
My advice is simple: use the calendar to find promising dates, then check the total cost and fare rules before you pay.
That is how I would use it to find a lower Southwest fare without letting a flashy price take over the entire decision.
Sources checked
- Southwest Low Fare Calendar
- Southwest Help Center: Finding the lowest fare
- Southwest Help Center: Current fare types
- Southwest fare types and benefits
- Southwest travel fees and baggage rules
- Southwest customer service commitment
Southwest Airlines Low Fare Calendar FAQ
What is the Southwest Airlines Low Fare Calendar?
The Southwest Airlines Low Fare Calendar is a date comparison tool that shows the lowest fare currently available for each day on a specific route. Southwest displays the results one month at a time, making it easier to compare flexible travel dates.
How do I use the Southwest Low Fare Calendar?
Enter your departure airport, arrival airport, trip type, passenger count, and travel dates. You can view prices in dollars, Rapid Rewards points, or Cash + Points. Then compare the available dates and check the fare rules before booking.
Does the Southwest Low Fare Calendar guarantee the lowest price?
No. The calendar shows the lowest fare currently available when you search, but Southwest says fares can change at any time. Sale fares may also be limited to certain dates, flights, and routes.
Can I search for both one-way and round-trip flights?
Yes. You can search for one-way or round-trip travel. When comparing a round trip, check the price of both flight segments and review the final total before completing the booking.
What fare types can appear on the Southwest Low Fare Calendar?
Southwest currently lists Basic, Choice, Choice Preferred, and Choice Extra fares. The lowest calendar price may be a Basic fare, which has more restrictions. Review the change, cancellation, seating, and baggage rules before choosing a fare.
Can I change my Southwest flight if the fare drops?
Eligible Choice, Choice Preferred, and Choice Extra bookings can generally be changed, although a fare difference may apply. If the new flight costs less, the difference may be issued as a Transferable Flight Credit or refunded when the fare includes refundability. Basic fares cannot be changed unless upgraded.
Does Southwest charge for checked bags?
Southwest currently allows every ticketed passenger to bring one carry-on bag and one personal item for free. Checked-bag benefits depend on the fare type, loyalty status, credit card benefits, and other qualifications. Check Southwest’s current baggage fee page before booking.
Can I cancel a Southwest flight within 24 hours?
Southwest’s customer service commitment says travelers can cancel an unchanged reservation within 24 hours of the initial booking for a full refund. The reservation must be made at least one week before departure. Check the terms shown during booking because fare rules and timing still matter.
