Carry-On Baggage Rules by Airline: The Complete 2026 Guide

You booked the flight. Now comes the part that trips up even frequent travelers: what can you actually bring into the cabin without paying extra or getting stopped at the gate? Carry-on rules are not standardized. They change by airline, by region, by fare class, and sometimes by aircraft. This guide pulls the whole picture together and points you to the exact page for your airline.

We track carry-on and personal item policies for more than 75 airlines and keep the numbers checked against each carrier’s own published rules. Use this page as the map, then drill into the specific tool or guide you need.

How carry-on rules actually work

Every airline lets you bring one small personal item for free: a backpack, purse, or laptop bag that fits under the seat in front of you. The thing that varies is the second, larger bag that goes in the overhead bin. Full-service airlines call it a carry-on and include it on most fares. Budget airlines call it a cabin bag and sell it separately.

So before you compare any two airlines, separate the two questions: how big can my free personal item be, and is the overhead carry-on included or extra? Our carry-on size checker answers both for any airline in a few seconds, with diagrams and a gate-check risk rating.

Carry-on size by region

Sizes cluster by region. On US carriers the standard carry-on is about 22 x 14 x 9 inches (56 x 36 x 23 cm). On most European and international airlines the common limit is 55 x 40 x 23 cm. The two are close, which is why a 55 x 40 x 23 cm bag is sold as a near-universal cabin bag.

The bigger trap on non-US airlines is weight. US legacy carriers rarely weigh carry-ons, but many European, Asian, and Middle Eastern airlines cap cabin-bag weight between 7 kg and 10 kg and enforce it at the gate. If you are flying a non-US carrier, see our guide to carry-on weight limits by airline and weigh your packed bag at home.

For the smaller bag, the allowance ranges from a generous tote on US legacy airlines down to a strict 40 x 30 x 15 cm on some budget carriers. Our personal item dimensions by airline guide lists them side by side, and the best personal item bags for budget airlines covers what actually fits when the limit is tight.

Which airlines charge for a carry-on

Budget carriers give you a personal item on the base fare and charge for overhead-bin access. In 2026 that group includes Frontier, Allegiant, Ryanair, easyJet, Wizz Air, Sun Country, Breeze, Vueling, and Volaris. Frontier is now the most expensive US carry-on fee at about $59 at booking and up to $75 at the gate. Spirit charged more but ceased operations in May 2026.

The full breakdown, with every current price and how to avoid each fee, is in which airlines charge for carry-on bags. If your goal is to skip the overhead bag entirely, how to avoid checked baggage fees pairs well with it.

Basic economy: when your “free” carry-on is not included

The other place people get caught is basic economy. American Basic Economy and Delta Main Basic both include a full carry-on. United Basic Economy does not on domestic and short-haul routes, where it allows a personal item only. Always read what your exact fare includes before you book, because the cheapest fare class is where airlines quietly remove the overhead bag.

How to make any bag fit

If your bag is close to the limit, the fix is usually the bag, not the packing. A soft-sided bag built to spec compresses into a sizer in a way a hard shell will not. Our roundups of the best carry-on bags and the best 55 x 40 x 23 cm carry-on luggage focus on bags that actually measure to their claimed size. And if you have ever wondered whether a 22-inch suitcase counts, we tested exactly that in does a 22-inch suitcase fit as a carry-on.

Compare two airlines head-to-head

Choosing between two carriers on the same route? Our airline comparisons put baggage, fees, seats, and total cost side by side. Jump straight to the segment you are booking:

• US legacy carriers for the American, Delta, United, and Alaska matchups
• US ultra-low-cost carriers for the budget matchups where bag fees decide the winner
• European budget airlines for Ryanair, easyJet, and Wizz Air
• European legacy airlines and Asian airlines for full-service international carriers

Look up your exact airline

When you know which airline you are flying, go straight to the source. The carry-on size checker has a dedicated page for each carrier with its exact carry-on dimensions, personal-item allowance, weight limit, and gate-check risk. That page is the one to trust on the day you pack, because it is checked against the airline’s own published policy.