All dimensions in inches, wheels and handles included.
| Airline | Under the seat | Overhead bin | Weight | Carry-on cost |
|---|---|---|---|---|
| American Airlines | 18 × 14 × 8 | 22 × 14 × 9 | — | Free |
| Delta Air Lines | Not published | 22 × 14 × 9 max 45 linear |
— | Free |
| United Airlines | 17 × 10 × 9 | 22 × 14 × 9 | — | Free except Basic Economy |
| Southwest Airlines | Not published | 24 × 16 × 10 | — | Free |
| Alaska Airlines | Not published | 22 × 14 × 9 max 45 linear |
— | Free |
| JetBlue | 17 × 13 × 8 | 22 × 14 × 9 | — | Free |
| Hawaiian Airlines | Not published | 22 × 14 × 9 max 45 linear |
— | Free |
| Frontier Airlines | 18 × 14 × 8 | 24 × 16 × 10 | 35 lb | Paid |
| Allegiant Air | 18 × 14 × 8 | 22 × 16 × 10 | — | Paid |
| Breeze Airways | 17 × 13 × 8 | 22 × 14 × 9 | 35 lb | Paid |
| Sun Country Airlines | 17 × 13 × 9 | 24 × 16 × 11 | 35 lb | Paid |
The personal item is free on every US airline, on every fare, without exception. Only the overhead-bin carry-on ever costs extra. Airlines measure the outside of the bag — wheels, handles, straps and bulging pockets all count.
Delta, Southwest, Alaska and Hawaiian publish no personal item dimensions; the only test is that it fits under the seat. Spirit ceased operations on 2 May 2026. Airlines change these without notice — recheck before you fly at airlinebagsizes.com
Manufacturers publish dimensions inconsistently, and a “20-inch” spinner is almost never 20 inches once you count the wheels. Where a brand states dimensions including wheels and handles, that’s the number we use. Where it only publishes the case, we say so on the card. Airlines measure the outside of your bag — wheels, handles, straps and all. Anything marked borderline is down to the gate agent, and remember that a soft bag squashes into a sizer while a hard shell won’t.
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Limits verified August 2026 against each carrier’s published policy. Airlines change these without notice — always confirm before you fly. Spirit Airlines ceased operations on 2 May 2026 and is no longer listed.
Airline Bag Size Checker v1.0.15 · last updated 2026-08-12