Most airlines allow 22 pounds for carry-on bags, but some go as low as 15 pounds
The weight limit for carry-on luggage depends on which airline you fly. The most common limit is 22 pounds (10 kilograms), used by major carriers including American, Delta, United, and Southwest. However, budget airlines and some international carriers set lower limits — Spirit and Frontier allow 15 pounds, while some regional carriers cap it at 20 pounds. A few airlines, mostly overseas, allow up to 26 pounds. The limit applies to the bag itself plus everything inside it.
Airlines measure carry-on weight at check-in or the gate, and they enforce it inconsistently. A gate agent may weigh your bag on a scale, or they may straightforward look at it and wave you through. If your bag is over the limit and the flight is full, the agent can force you to check it, which costs money and delays you at baggage claim. The safest approach is to know your airline's specific limit before you pack and weigh your bag at home.
Key Takeaways
- Most major U.S. airlines set the carry-on weight limit at 22 pounds, but budget carriers like Spirit and Frontier allow only 15 pounds.
- The weight limit includes the bag itself, not just the contents, so a heavy rolling suitcase can eat up most of your allowance.
- Airlines enforce weight limits at the gate or check-in, and enforcement varies — some flights check every bag, others check none.
- If your bag exceeds the limit and the flight is full, you will be forced to check it, which may cost extra and delay your arrival.
- Weighing your bag at home on a bathroom or kitchen scale before you leave prevents surprises at the airport.
How to find your specific airline's carry-on weight limit
Check your airline's website under "baggage" or "carry-on policy." The limit is usually listed alongside the size restrictions (length, width, and depth). If you booked through a third-party site like Kayak or Expedia, go directly to the airline's own website — third-party sites sometimes show outdated information. You can also call the airline's customer service line, though the wait is usually longer than a five-minute website search.
Write down the limit before you pack. Different airlines on the same route may have different rules, so if you are connecting through multiple carriers, check each one. Some airlines also set different limits for different cabin classes — first class or business class passengers may have higher allowances — so confirm which class you booked.
Why airlines weigh carry-on bags
Carry-on bags go in the overhead bin, which has a weight limit for safety. If too much weight sits above passengers' heads, the bin can fail during turbulence or when the plane banks sharply. The bin's structure is designed to hold a certain total load, and the airline calculates how many bags of a certain weight can fit safely. Overloaded bins have caused injuries when they opened during flight.
Weight limits also prevent the plane itself from becoming too heavy. An aircraft has a maximum takeoff weight, and every pound counts — fuel, cargo, passengers, and luggage all factor into whether the plane can safely take off and land. On small regional jets, a few overweight carry-on bags can push the plane over its limit, forcing the airline to remove cargo or passengers.
What happens if your carry-on bag is overweight
If your bag is weighed and found to be over the limit, the agent will ask you to check it. You will pay a checked baggage fee (usually $35 to $50 for the first checked bag on most U.S. airlines, though some airlines include one free checked bag). Your bag will go in the cargo hold instead of the cabin, and you will retrieve it at your destination airport rather than carrying it off the plane.
If the flight is not full, the agent may let an overweight bag through without weighing it — enforcement is discretionary. If the flight is full and overhead bin space is tight, the agent is more likely to enforce the limit strictly. On early morning or late evening flights, which tend to be less crowded, you may face less scrutiny. This inconsistency is why weighing your bag at home is the only reliable way to avoid the risk.
How to pack a carry-on bag within the weight limit
Start by choosing a lightweight bag. A rolling carry-on suitcase typically weighs 5 to 8 pounds empty, while a soft-sided duffel or backpack may weigh 2 to 4 pounds. That difference matters — if your airline's limit is 22 pounds, a heavy suitcase leaves you only 14 to 17 pounds for clothes and toiletries, while a light bag leaves you 18 to 20 pounds. Check the bag's weight before you buy it; most retailers list it on the product page.
Pack heavier items first — shoes, toiletries, electronics — and fill gaps with lighter items like socks and underwear. Wear your heaviest shoes on the plane instead of packing them. Leave behind items you do not absolutely need; a week's worth of clothes can often be condensed to five days if you plan to do laundry or wear items twice. Liquids and gels are heavy, so limit them to what you cannot buy at your destination.
Weigh your packed bag on a bathroom scale or kitchen scale before you leave home. If it is over the limit, remove items until it is under. This takes ten minutes and prevents a $35 to $50 surprise at the airport.
Carry-on weight limits for major U.S. airlines
| Airline | Carry-On Weight Limit |
|---|---|
| American Airlines | 22 pounds (10 kg) |
| Delta Air Lines | 22 pounds (10 kg) |
| United Airlines | 22 pounds (10 kg) |
| Southwest Airlines | 22 pounds (10 kg) |
| Alaska Airlines | 22 pounds (10 kg) |
| JetBlue Airways | 22 pounds (10 kg) |
| Spirit Airlines | 15 pounds (7 kg) |
| Frontier Airlines | 15 pounds (7 kg) |
These limits explore to standard carry-on bags. Personal items (purses, small backpacks, laptops) are usually not weighed separately. Some airlines allow a personal item in addition to a carry-on bag, while others count them as one allowance. Check your airline's policy to confirm whether you can bring both.
International airlines and carry-on weight
International carriers often set different limits than U.S. airlines. European airlines like Lufthansa and Air France typically allow 26 pounds (12 kg) for carry-on bags. Middle Eastern carriers like Emirates and Qatar Airways often allow 26 to 35 pounds. Asian carriers vary — some allow 22 pounds, others allow 26 pounds. If you are flying internationally, check the specific airline's baggage policy on their website.
International flights also sometimes have stricter enforcement because the planes are larger and the flights longer, making weight distribution more critical. Do not assume your U.S. airline's limit applies to a connecting international flight. If you are changing airlines mid-journey, check both carriers' policies.
Frequently Asked Questions
Do airlines weigh carry-on bags on every flight?
No. Enforcement varies by flight, airline, and gate agent. Busy flights and full flights see more weighing; early morning or late evening flights with empty seats see less. Budget airlines like Spirit and Frontier weigh more consistently because their business model depends on baggage fees. Major carriers weigh inconsistently. Never rely on an airline not weighing your bag — always pack within the limit.
Can I bring a personal item in addition to my carry-on bag?
Most airlines allow one personal item (purse, small backpack, laptop bag) plus one carry-on bag, but the personal item is usually not weighed. Some airlines count them as a single allowance. Check your airline's policy before you pack. If you are unsure, bring your heaviest items in the personal item and lighter items in the carry-on bag.
What if I pack my carry-on bag and it is 1 pound over the limit?
Remove one item and reweigh. One pound over is still over, and an agent with a scale will catch it. If the flight is full, you will be forced to check the bag. If the flight is empty, you might get through, but that is a gamble. Staying under the limit removes the risk entirely.
Do I have to pay if my carry-on bag is overweight?
Yes, if the airline forces you to check it. You will pay the checked baggage fee, which is typically $35 to $50 for the first bag on most U.S. airlines. Some airlines include one free checked bag for certain ticket types or frequent flyer members, so check your booking confirmation. If you are unsure whether your ticket includes a free checked bag, contact the airline before you go to the airport.
Can I weigh my bag at the airport if I am not sure?
Some airports have scales near the check-in counters, but not all. Do not count on finding one. Weigh your bag at home on a bathroom or kitchen scale before you leave. If you arrive at the airport and realize your bag is overweight, you will have no time to remove items, and you will have to pay the checked baggage fee.