Most US airlines have no carry on weight limit at all. American Airlines publishes a size limit for its carry-on bag: 22 by 14 by 9 inches. It says nothing about weight.
The bag only has to fit in the overhead bin or under the seat.
Fly outside the United States and the picture flips. Most non US carriers set a hard number, usually 7 to 12 kilograms. Some will put your bag on a scale before you board.
So how much can a carry on weigh depends entirely on who you are flying.
This page sorts out which carriers care and who actually checks. It also covers what happens when you are over, and how to weigh your bag before you leave the house.
Do US airlines have a carry on weight limit
American, Delta, and United do not publish a carry-on luggage weight limit for domestic or international flights. Southwest and JetBlue follow the same pattern. There is a size cap, but no scale.
The TSA confirms this is not a security rule. Weight limits, where they exist, come from the airline, not from TSA or the FAA.
Spirit and Frontier still price by size for the personal item and carry-on bag. A bag that is heavy but fits the sizer usually gets waved through at a US gate.
The real risk on a US carrier is the sizer box, not a scale. An overstuffed bag that bulges past its frame is what gets flagged.
Which carriers actually enforce a carry on luggage weight limit
Almost every carrier based outside North America publishes a cabin bag weight limit. Low-cost carriers enforce it hardest.
easyJet caps its cabin bag at 15 kilograms. You also have to be able to lift and stow it yourself.
Singapore Airlines allows 7 kilograms in economy class, one piece only. That is typical of the tighter end for full service Asian and Gulf carriers.
Ryanair and other European low-cost carriers are widely known for a limit near 10 kilograms. We could not confirm the current exact figure on Ryanair’s own site at the time of writing. Treat any Ryanair number you see elsewhere as one to double check before you fly.
The maximum weight for carry on luggage is a carrier specific number, not an industry standard, and it changes.
| Carrier type | Typical carry-on weight limit | Who enforces it |
|---|---|---|
| US legacy carriers: American, Delta, United | None published | Size only, rarely weighed |
| US low-cost: Spirit, Frontier, Southwest | None published | Size only, sizer boxes |
| easyJet | 15 kg | Gate agents, spot checks |
| Singapore Airlines, economy | 7 kg | Check-in and gate scales |
| Most European low-cost and Asian budget carriers | Roughly 7 to 12 kg, verify on the carrier’s site | Bag drop and gate, often |
Are carry on bags weighed, and where
Yes, but unevenly. Travelers on the Rick Steves Travel Forum describe very different experiences on the same airline. One wrote that at Belfast staff didn’t weigh or measure anything. At Edinburgh on the same carrier they weighed everything, and charged a hefty excess weight fee.
Another traveler on that thread said online check-in has made enforcement more random than it used to be. Every carry on used to get weighed at check-in, they wrote, and now it varies by flight.
UK and European airports tend to run stricter checks than others. Gate lines for the scale show up during busy periods.
In practice, weight checks cluster at bag drop counters and boarding gates on low-cost carriers, especially in Europe and parts of Asia. They are rare at US domestic gates.
What happens when your carry on is over the weight limit
On a carrier that enforces a limit, an overweight bag usually leads to one of three outcomes. You pay an excess weight fee on the spot. Or you gate check the bag into the hold for a separate charge, or shift weight into a coat pocket to slip back under the cap.
The Rick Steves forum thread includes a blunt warning worth repeating. Travelers should be prepared to pay in cash if overweight. Some low-cost carriers will not take cards for that fee at the gate.
One traveler on the same thread said the excess fee cost more than his ticket. Budget carriers price low up front and recoup it at the gate.
How to weigh your carry on before you fly
- Use a household bathroom scale. Step on it holding the bag, then step on it alone, and subtract the difference.
- A handheld luggage scale with a hook is faster and cheap enough to keep in a drawer.
- Weigh the bag packed as you plan to travel. Include the coat you intend to wear at the airport.
- Check the exact figure on the airline’s own baggage page before you travel. Limits change by fare class and by route.
If a bag keeps coming in over budget, our carry-on rebalance tool shows which items add the most weight. Then you can shift or cut before you reach the counter.
Carry-on luggage weight limit for international flights
The rule that matters on an international itinerary is the operating carrier’s rule for that specific flight. There is no blanket international standard. A traveler connecting from a US airline with no weight limit onto a partner that caps carry-on at 7 kilograms should pack for the stricter leg.
Check the airline record for your actual flight, such as Emirates, Singapore Airlines, or Turkish Airlines, rather than assuming US norms apply everywhere.
Fare class matters too. Business and first class cabins often get a higher weight allowance or an extra piece, even on carriers that cap economy tightly. The same airline can feel completely different depending on where you sit.
Common questions
How much can a carry on weigh on American, Delta, or United?
None of the three publishes a weight limit for carry-on bags. The rule that governs is the size of the bag and whether it fits the overhead bin or under the seat.
What is the AA carry on weight limit?
American Airlines does not state a carry on weight limit. Its published rule is a size limit of 22 by 14 by 9 inches for the standard carry-on bag.
How many pounds for carry on luggage on a low-cost international carrier?
Figures in the 15 to 26 pound range, roughly 7 to 12 kilograms, are common on low-cost and many full service international carriers. Confirm the exact number on that airline’s own site, since it varies by carrier and sometimes by fare.
Are carry on bags weighed at every airport?
No. Enforcement is inconsistent even within one airline. Travelers report scales used heavily at some airports and skipped entirely at others on the same route.
What is the maximum weight for carry on luggage on easyJet?
easyJet sets its cabin bag limit at 15 kilograms. You also need to be able to lift and stow the bag yourself, without help.
Can gate agents make me check a carry on for being too heavy?
Yes, where an airline enforces a weight limit. The usual options are paying an excess weight fee or gate checking the bag into the cargo hold for a separate fee.
The bottom line
If you fly mostly US domestic on the big carriers, weight is close to a nonissue and size is what actually gets checked. The moment you book a non US or low-cost carrier, treat the carry on weight limit as a real number worth confirming on that airline’s own site. Weigh your bag at home so the gate scale never gets to surprise you.