If you have flown recently, you have probably noticed the metal bag sizers at the gate are not just decoration anymore. In 2026, US airlines are enforcing carry-on limits more strictly than they have in years, and a bag that squeaked by in 2023 can now earn you a gate-check fee.
Here are the current limits for the major US carriers, what counts as a personal item, and a few honest tips for staying under the line. We verified these numbers against published airline guides in July 2026. Rules can change, so always double check your airline's own baggage page before a trip, especially if you booked a basic economy fare.
The short answer
For almost every major US airline, the standard carry-on limit is 22 x 14 x 9 inches, including wheels and handles. If your bag meets that number, you are safe on American, Delta, United, JetBlue, and Alaska.
Southwest is the outlier in a good way: it allows a larger 24 x 16 x 10 inches.
Carry-on limits by airline (2026)
| Airline | Carry-on limit (inches) | Notes |
|---|---|---|
| American | 22 x 14 x 9 | Included on all fares, even Basic Economy |
| Delta | 22 x 14 x 9 | Included on Basic Economy |
| United | 22 x 14 x 9 | Basic Economy domestic gets personal item only |
| Southwest | 24 x 16 x 10 | Most generous limit among the majors |
| Alaska | 22 x 14 x 9 | Standard limit |
| JetBlue | 22 x 14 x 9 | Blue Basic fares get personal item only |
Two things trip people up in that table.
Wheels and handles count
The 22 x 14 x 9 measurement includes everything that sticks out: wheels, the telescoping handle housing, and any bulging front pockets. Manufacturers sometimes list interior dimensions or "body only" sizes, so a suitcase marketed as carry-on sized can measure 23 inches wheel to handle. Measure your actual bag from the floor to the top of the handle before you trust the label.
Your fare class matters as much as your bag
On United domestic Basic Economy and JetBlue Blue Basic, a full-size carry-on is not included at all. You get a personal item only, and bringing a roller bag to the gate means paying to check it. American and Delta still include a carry-on with Basic Economy. If you are comparing cheap fares, that difference can quietly erase the savings.
Personal item sizes (the under-seat bag)
Personal item limits vary more between airlines than carry-on limits do. Published limits for 2026:
| Airline | Personal item (inches) |
|---|---|
| American | 18 x 14 x 8 |
| Delta | 18 x 14 x 8 |
| United | 17 x 10 x 9 |
| Southwest | 16.25 x 13.5 x 8 |
| JetBlue | 17 x 13 x 8 |
| Spirit | 18 x 14 x 8 |
| Frontier | 14 x 18 x 8 |
The personal item must fit fully under the seat in front of you. A soft, squashable bag has a real advantage here over anything rigid, because an inch of overstuffing can be pressed flat.
Why enforcement got stricter
Airlines have moved from the honor system to actually measuring. More gates use bag sizers and some airports have automated scanners, and gate-check fees for oversized bags commonly run in the 60 to 100 dollar range depending on the airline and route. The days of a visibly oversized bag sliding through boarding are mostly over.
There is no trick around this. The reliable strategy is boring: know your airline's number, measure your packed bag at home, and pack so the bag closes without bulging.
How to stay under the limit without stress
Measure the packed bag, not the empty one
A soft bag grows when you overfill it. Pack fully, zip it, then measure. If the front pocket bulges past 9 inches of depth, redistribute.
Compress the soft stuff
Clothes are the bulkiest, most compressible thing in your bag. Compression cubes squeeze out trapped air so the same clothes take up noticeably less space, which is often the difference between a bag that zips flat and one that bulges past the sizer. We make a set for exactly this: the PackLite Air Cubes vacuum compression set compresses by rolling, no vacuum machine needed. Any decent compression cube helps; the point is to compress rather than cram.
Watch weight on international and regional flights
Most US domestic carriers do not publish a carry-on weight limit, but many international airlines do, often 15 to 22 pounds. If your trip connects to a foreign carrier or a small regional jet, weigh your bag at home. A handheld luggage scale costs less than a single overweight fee and takes ten seconds to use.
When in doubt, size for the strictest airline
If you fly a mix of airlines, buy and pack for 22 x 14 x 9. A bag that fits the strictest common limit fits everywhere, and you never have to think about it again.
The bottom line
- Standard US carry-on limit in 2026: 22 x 14 x 9 inches including wheels and handles. Southwest allows 24 x 16 x 10.
- Basic Economy on United (domestic) and JetBlue Blue Basic means personal item only.
- Enforcement is real now. Measure your packed bag at home.
- Compression and a luggage scale are the two cheapest ways to guarantee you pass the sizer.
Numbers verified against published 2026 airline baggage guides in July 2026, including roundups by SmarterTravel and Upgraded Points. Airlines change rules without much notice, so confirm on your carrier's site before you fly.