Southwest Airlines fees and trap map
Southwest still matters because free checked bags can reset the math, but the newer fare structure means travelers should stop treating old Southwest assumptions as universal truth.
Fast read: The 2-Bag Weight Split: You get 2 free bags. Pack a light foldable duffel so you can split a 51 lb bag into two ~26 lb bags at the kiosk and avoid the $100+ overweight fee.
Southwest is the benchmark airline for bag value, yet its newer fare structure means users still need to read the fine print.
You are trading bag savings against fare-family differences, seating or boarding changes, and same-day flexibility rules.
Southwest works as a benchmark airline users should compare against before paying annual fees elsewhere just to claw back bag costs.
This is a benchmark page now
Southwest helps users answer whether another airline's low fare is actually low once a normal bag enters the trip.
The old free-bag story is not the whole story
Southwest now needs closer reading by fare family and booking timing, which makes the airline strategically more interesting than its reputation suggests.
Seat and boarding changes are the new friction zone
As Southwest becomes more segmented, users need to compare it less as mythology and more as an all-in product.
1st checked bag: free (applies to travel booked and ticketed before May 28, 2025)
Carryon + personal item included: (a) one carryon bag not exceeding 10 x 16 x 24 inches; and (b) one smaller personal item stowable under a seat or in an overhead compartment
No seat selection with Basic fares; a Standard seat will be assigned at check-in (flights departing on or after January 27, 2026). Until then, Southwest uses open seating
No cancel fees (all fare types eligible for cancellations without a fee); failure to cancel at least 10 minutes prior to scheduled departure may result in forfeited travel funds
How to beat Southwest Airlines fees
Go from fee table to traveler strategy: traps, workarounds, fee-stack math, and what to do before checkout.
This page should not be a dead-end database row. Use it to move into the fee-avoidance guide, then into the tool that solves the actual problem.
- The "Flight Credit" Trap: If you switch to a cheaper flight, you don’t get cash back—you get a credit that expires in 12 months.
The 2-Bag Weight Split: You get 2 free bags. Pack a light foldable duffel so you can split a 51 lb bag into two ~26 lb bags at the kiosk and avoid the $100+ overweight fee.
Published fee rows
| Category | Amount | Conditions | Pricing | When | Source |
|---|---|---|---|---|---|
| Carry on | 0.00 USD | Carryon + personal item included: (a) one carryon bag not exceeding 10 x 16 x 24 inches; and (b) one smaller personal item stowable under a seat or in an overhead compartment | Not published | per flight | Source |
| Checked baggage | 0.00 USD | 1st checked bag: free (applies to travel booked and ticketed before May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 0.00 USD | 2nd checked bag: free (applies to travel booked and ticketed before May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 35.00 USD | 1st checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 45.00 USD | 2nd checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 35.00 USD | 1st checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 45.00 USD | 2nd checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 35.00 USD | 1st checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 45.00 USD | 2nd checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 0.00 USD | 1st checked bag: free (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 0.00 USD | 2nd checked bag: free (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Checked baggage | 150.00 USD | 3rd+ checked bag (for travel booked and ticketed and/or changed on or after May 28, 2025) | per direction | Not published | Source |
| Oversize baggage | 200.00 USD | Oversized item: in excess of 62 inches but not more than 80 inches; charge is in addition to the standard checked bag fee | per direction | Not published | Source |
| Overweight baggage | 100.00 USD | Overweight item: 51–70 lbs; charge is in addition to the standard checked bag fee | per direction | Not published | Source |
| Overweight baggage | 200.00 USD | Overweight item: 71–100 lbs; charge is in addition to the standard checked bag fee | per direction | Not published | Source |
| Oversize baggage | 200.00 USD | Oversized & overweight: only one $200 charge applies if the piece is both oversized and overweight (as long as it does not exceed 100 lbs); standard checked bag fee also applies | per direction | Not published | Source |
| Seat selection | 0.00 USD | No seat selection with Basic fares; a Standard seat will be assigned at check-in (flights departing on or after January 27, 2026). Until then, Southwest uses open seating | Not published | check-in / boarding | Source |
| Seat selection | Varies USD | Paid seat upgrades (for flights departing on or after January 27, 2026) | Not published | per segment | Source |
| Change cancellation | 0.00 USD | No cancel fees (all fare types eligible for cancellations without a fee); failure to cancel at least 10 minutes prior to scheduled departure may result in forfeited travel funds | Not published | before departure | Source |
| Same day change | 0.00 USD | Free same-day change available only for Choice Extra, Choice Preferred, or Choice fares; Basic fares not eligible unless fare is upgraded | Not published | day of travel | Source |
| Same day standby | 0.00 USD | Same-day standby available; request must be made at least 10 minutes prior to scheduled departure of original flight; if using app/mobile web for standby, must list 30 minutes ahead of scheduled departure | Not published | day of travel | Source |
| Unaccompanied minor | 100.00 USD | Unaccompanied minor (UM) service charge (ages 5–11): U.S. Mainland | per direction | Not published | Source |
| Unaccompanied minor | 35.00 USD | Unaccompanied minor (UM) service charge (ages 5–11): Between Hawaiian Islands | per direction | Not published | Source |
Use this page the right way
The fee table is the evidence layer. The value comes from connecting it to trap logic, enforcement reality, and the next action that lowers your all-in cost.
Compare against nearby alternatives
This route is part of the Core 10 set. Treat it like an authority page that should feed users into guides and deterministic tools, not like a leaf node.
Sizer Reality Check
Carry-on measurements usually include wheels and handles. A bag marketed as "22 inches" can still fail if the real outer shell runs tall or will not compress when gate staff starts enforcing size visually.
Legal Disclaimer
Database ID: southwest
If a row is missing or unclear, the right move is to link to the carrier source or mark the uncertainty, not invent confidence.