What Size Carry-On Luggage Is Allowed? | The 22x14x9 Standard

A carry-on that sticks out too far costs time and money at the gate. The standard U.S. limit of 22 x 14 x 9 inches covers the big four legacy carriers, but the real answer depends on exactly which airline you’re flying. Here’s how to measure your bag correctly, which airlines break from the norm, and how to know whether your suitcase will actually make it past the gate agent.

The Standard U.S. Carry-On Size Most Airlines Use

The most commonly stated limit across American, Delta, United, JetBlue, and Alaska Airlines is 22 x 14 x 9 inches, including handles and wheels. The FAA confirms that 45 linear inches (height + width + depth) is the maximum total most airlines accept before a bag must be checked. This standard fits overhead bins on most mainline aircraft, but regional jets with smaller bins still force gate-checking even compliant bags.

Which Airlines Stick To The Standard And Which Don’t

The table below covers the major U.S. carriers and their published carry-on size limits. Always verify on the airline’s own baggage page before packing — third-party charts are often stale.

How To Measure Your Carry-On Correctly

Three steps and one common mistake separate a smooth boarding from a last-minute check. Measure height, width, and depth with the wheels, handles, and any external pockets fully extended. Add the three numbers to get the total linear inches if the airline uses that rule. The most common error is assuming wheels don’t count — they absolutely do, and a bag that fits without them will fail the sizer at the gate. If you’re ready to buy a new bag, the best carry-on suitcases for international travel ship with the 22x14x9 dimensions and often include built-in sizer fit guarantees.

Weight Limits And The Personal Item Exception

Most U.S. airlines do not publish a domestic carry-on weight limit, but some international carriers and a few domestic budget airlines do — check the specific carrier’s baggage page before you fly. The TSA does not set carry-on size limits; that’s entirely an airline decision. Carry-on rules are also distinct from personal-item rules. Personal items (purses, laptop bags, small backpacks) must fit under the seat and are typically smaller — often around 17 x 10 x 8 inches — but dimensions vary by airline. Even a carry-on that matches published sizes may get gate-checked if the overhead bins fill up or if the aircraft is a small regional jet. It’s worth a few hundred extra words to know the difference between personal item and carry-on allowances to avoid surprises.

FAQs

Can I use the same carry-on for international flights?

International carriers frequently use smaller limits — often 21.5 x 13.5 x 9 inches — and may impose weight caps as low as 15 pounds for economy. Always check the international carrier’s baggage page before assuming U.S. standards apply abroad.

What happens if my carry-on is an inch too big?

Gate agents may force you to check the bag at the gate, which can incur a checked-bag fee and risk damage. Some airlines offer a sizer test — if the bag doesn’t fit, you check it on the spot. A tight squeeze in the sizer is still a fail.

Does the FAA set carry-on dimensions?

No. The FAA provides guidelines for safe stowage, but each airline sets its own size limits. The 45 linear inch guideline is a common FAA reference point airlines use, but it is not a legal limit enforced by the agency.