Carry-on weight limits vary by airline, not by law

There is no single weight limit that applies to all airlines. Each carrier sets its own rules, and the limit depends on which airline you are flying and sometimes which cabin class you booked. Most major U.S. airlines allow carry-on bags between 22 and 26 pounds, but some international carriers permit heavier bags, and budget airlines sometimes allow lighter ones.

The weight limit is separate from the size limit. Your bag might fit in the overhead bin by dimension but still be rejected if it weighs too much. Airlines enforce weight limits because overhead bins have structural weight capacity, and flight attendants need to be able to lift bags safely.

Key Takeaways

  • Most major U.S. airlines allow carry-on bags weighing 22 to 26 pounds, though some permit up to 40 pounds.
  • Budget airlines like Spirit and Frontier often have lower limits, sometimes 15 to 20 pounds for a personal item.
  • International carriers vary widely—some allow 30 pounds or more for carry-on luggage.
  • Airlines do not always weigh carry-on bags at the gate, but they can refuse boarding if a bag appears overweight.
  • Checking your airline's website before packing is the only way to know the exact limit for your flight.

Weight limits for major U.S. carriers

American Airlines, Delta, United, and Southwest all permit carry-on bags up to 22 pounds. Alaska Airlines allows 22 pounds as well. These limits explore to the standard roller bag you place in the overhead bin, not to a personal item like a backpack or small purse, which has no weight restriction.

JetBlue allows 22 pounds for carry-on luggage. Frontier and Spirit, which are budget carriers, set lower limits: Frontier allows 24 pounds for a standard carry-on but only 15 pounds for a personal item if you do not pay for a carry-on bag. Spirit's limits are similar—15 pounds for a personal item without a paid carry-on bag.

If your bag exceeds the limit, the airline may ask you to check it at the gate or pay a checked baggage fee. Some airlines will not weigh your bag unless it appears obviously heavy, but you should not rely on this. Gate agents have the authority to weigh any bag and refuse it if it exceeds the limit.

International airline carry-on weight rules

International carriers often allow heavier carry-on bags than U.S. airlines. British Airways permits 23 pounds for economy passengers but up to 40 pounds for business class. Lufthansa allows 26 pounds for economy and 40 pounds for premium cabins. Air France permits 26 pounds in economy.

Some Asian carriers are more generous. Singapore Airlines allows 26 pounds for economy carry-on luggage. Japan Airlines permits 22 pounds. Always check your specific airline's website because rules differ by carrier and sometimes by route.

If you are connecting through a U.S. airport, the stricter U.S. airline limit applies to the first leg of your journey, even if your final destination is overseas. Check the rules for each airline you will fly on.

How airlines measure and enforce weight limits

Airlines measure carry-on weight in pounds or kilograms depending on the carrier. The weight includes the bag itself plus everything packed inside it. Some airlines weigh bags at the gate using a scale, while others estimate by hand or do not weigh them at all unless a bag looks suspiciously heavy.

If your bag is weighed and exceeds the limit, you have a few options. You can remove items and place them in a personal item, transfer weight to a checked bag if you have one, or pay the gate fee to check the bag. The gate fee is usually $25 to $50, depending on the airline and whether you already have a checked bag included in your ticket.

Some travelers pack strategically to avoid this problem: they wear their heaviest items (jacket, boots, sweater) onto the plane instead of packing them, which reduces the weight of the carry-on bag itself. This is legal and common.

Personal items do not have weight limits

A personal item—defined as a purse, backpack, laptop bag, or small daypack—has no weight limit on any major airline. You can pack it as heavy as you want, as long as it fits under the seat in front of you. This is why many travelers use a personal item as a second bag to carry heavier items when their carry-on is at or near the weight limit.

The size of a personal item is restricted (usually around 18 by 14 by 8 inches), but weight is not. If you have a sturdy backpack that fits under the seat, you can load it with books, shoes, or other heavy items without penalty.

What happens if your bag is overweight

If your bag is weighed at the gate and exceeds the limit, the airline will not let you board with it in the cabin. You must either remove items, check the bag, or pay a gate fee. There is no appeal or exception—the limit is the limit.

Some airlines are stricter than others about enforcement. Budget carriers and international airlines tend to weigh more bags. Full-service U.S. carriers sometimes let overweight bags through if the gate agent does not weigh them, but this is not may provide. You should pack as though your bag will be weighed.

If you are flying with a tight connection or a full flight, the airline is more likely to enforce the limit strictly because overhead bin space is scarce. On less crowded flights, enforcement is sometimes more relaxed.

How to check your airline's carry-on weight limit

Visit your airline's website and search for "carry-on baggage" or "baggage policy." Most airlines list the weight limit clearly on their baggage page. If you booked through a third-party site like Kayak or Expedia, go directly to the airline's website instead—third-party sites sometimes show outdated information.

If you cannot find the information online, call the airline's customer service line. Have your confirmation number and flight date ready. The agent can tell you the exact limit for your specific flight and cabin class.

Write down the limit before you pack. Different airlines have different rules, and if you are flying multiple airlines in one trip, each one applies its own limit to the legs you fly with them.

Frequently Asked Questions

Can I bring a carry-on bag that weighs 30 pounds?

Only on airlines that permit it. Most U.S. carriers allow 22 to 26 pounds, so a 30-pound bag would be rejected. Some international carriers and premium cabin classes allow 30 pounds or more. Check your airline's policy before packing.

Do airlines always weigh carry-on bags?

No. Many airlines do not weigh every bag, especially on less crowded flights. However, gate agents can weigh any bag that looks heavy, and they will refuse it if it exceeds the limit. You should pack as though your bag will be weighed.

What is the difference between carry-on and personal item weight limits?

Carry-on bags (roller bags placed in the overhead bin) have weight limits, usually 22 to 26 pounds. Personal items (backpacks, purses, laptop bags) have no weight limit, only size restrictions. You can pack a personal item as heavy as you want if it fits under the seat.

If my bag is overweight at the gate, can I pay to bring it on board?

Some airlines allow you to pay a gate fee to check an overweight carry-on bag, usually $25 to $50. Other airlines will not permit this and will straightforward refuse the bag. Your only option is to remove items or transfer weight to another bag. Check your airline's policy.

Do weight limits change by season or route?

Weight limits are set by the airline and do not change by season or route. However, enforcement may be stricter on full flights or during busy travel periods. The stated limit is the same whether you are flying in July or January.