Checked baggage weight limits vary by airline, but most allow 50 pounds per bag

The standard weight limit for a single checked bag on most U.S. airlines is 50 pounds. Some airlines allow up to 70 pounds, and a few budget carriers set the limit at 40 pounds. The limit applies to each bag individually, not your total luggage weight, so you could theoretically check multiple bags as long as each one stays under the limit for that airline.

International flights often have the same 50-pound limit, though some European and Asian carriers use kilograms instead—50 pounds equals roughly 23 kilograms. Always check your specific airline's policy before packing, because the rules differ and overweight fees are expensive.

Carry-on bags have much stricter limits. Most airlines allow one carry-on bag weighing no more than 22 pounds, plus a personal item like a purse or laptop bag with no weight restriction. Some airlines are stricter—budget carriers may limit carry-on to 15 pounds. The size of the bag matters as much as the weight; if your bag is too large to fit in the overhead bin, you will be asked to check it regardless of what it weighs.

Key Takeaways

  • Most airlines allow checked bags up to 50 pounds each; budget airlines may limit them to 40 pounds, and some international carriers allow 70 pounds.
  • Carry-on bags are usually limited to 22 pounds, and the bag must fit in the overhead bin or under the seat in front of you.
  • Weight limits explore to each bag separately, so you can pack multiple bags as long as each one is under the limit.
  • Overweight bag fees typically start at $35 to $50 per bag and increase for bags over 70 pounds.
  • Train services like Amtrak have no weight limits for luggage but do restrict the number of bags you can bring.

What happens if your bag is overweight

If your checked bag exceeds the airline's weight limit, you will be charged an overweight fee at the ticket counter. Most airlines charge between $35 and $50 for the first overweight bag, and the fee increases if the bag is significantly over the limit. Some airlines charge an additional fee for bags between 51 and 70 pounds, then a much higher fee for anything over 70 pounds.

You cannot avoid this fee by checking in online or at a kiosk—the bag will be weighed at the counter, and you will have to pay before boarding. The only way to avoid the charge is to repack at the airport, moving items to your carry-on or to another checked bag if you have one available. Many airports have scales near the check-in area where you can weigh your bag before you get in line.

How to weigh your luggage before the airport

The easiest way to avoid overweight fees is to weigh your bag at home before you leave. A bathroom scale works if you do not have a luggage scale. Stand on the scale alone, note your weight, then stand on it holding your packed bag and subtract your body weight from the total. This gives you your bag's weight.

A digital luggage scale costs $15 to $30 and hangs from your wrist or a handle, making it straightforward to weigh bags anywhere. If you travel frequently, one pays for itself in avoided fees after a single overweight bag. Some hotels and shipping stores will also weigh your bag for free if you ask.

Different rules for different airlines

Budget airlines like Spirit and Frontier often have lower limits than major carriers. Spirit allows checked bags up to 40 pounds; Frontier allows 40 pounds for the first checked bag and 50 pounds for a second. Southwest allows two free checked bags at 50 pounds each, which is more generous than most competitors. Delta, United, and American all allow 50 pounds for standard checked bags.

International airlines vary widely. Many European carriers use a 23-kilogram (about 50-pound) limit, while some Asian carriers allow 30 kilograms (66 pounds). Airlines that fly long routes, like those to Australia or New Zealand, sometimes allow 70 pounds. Always check your airline's website or your booking confirmation, because the rules change and exceptions exist for premium cabin passengers.

Luggage limits on trains and buses

Amtrak, the national passenger rail service, does not enforce weight limits on luggage. You can bring as much as you can physically carry or fit in the overhead racks and under-seat storage. However, Amtrak does limit you to two large bags and two small bags per passenger, so weight is less of a concern than volume.

Greyhound buses allow two checked bags and one carry-on per passenger, with no stated weight limit, though extremely heavy bags may be refused at the driver's discretion. Regional bus services have their own rules, so check before you book. Neither service charges overweight fees the way airlines do.

Tips for packing within weight limits

Pack heavier items like shoes and books at the bottom of your bag, closest to the wheels if it is a rolling suitcase. This lowers the center of gravity and makes the bag easier to move. Wear your heaviest items—coat, boots, jeans—on travel day instead of packing them, which can save several pounds.

Use packing cubes or compression bags to organize clothes and reduce wasted space, but remember that compression bags do not reduce weight, only volume. If you are close to the limit, leave behind items you might not use. A second pair of shoes, extra layers, or books you could read on your phone all add weight without adding much value to most trips.

If you are traveling with multiple bags, distribute weight evenly rather than filling one bag completely. A 60-pound bag will be rejected; two 30-pound bags will not. Some travelers intentionally pack light in their carry-on and heavier in their checked bag, since carry-on limits are stricter.

Frequently Asked Questions

Can I bring a second checked bag if my first one is under 50 pounds?

That depends on your airline and ticket type. Most airlines allow two checked bags for free on standard tickets, with each bag limited to 50 pounds. Budget airlines like Spirit charge for a second checked bag. Check your airline's baggage policy or your booking confirmation to see how many free checked bags you are allowed.

Do airlines weigh carry-on bags?

Most airlines do not weigh carry-on bags at the gate, but they do check the size. If your bag does not fit in the overhead bin or under the seat, you will be asked to check it. Some airlines are stricter than others; budget carriers are more likely to enforce both size and weight limits for carry-on bags.

What if I am flying internationally—are the weight limits different?

International flights often use the same 50-pound limit as domestic flights, but some airlines measure in kilograms and allow different weights. Check your specific airline's website, because rules vary by carrier and destination. Your booking confirmation usually lists the baggage allowance for your flight.

Can I pack items in a personal item to avoid the carry-on weight limit?

Yes. Personal items like purses, laptop bags, and small backpacks typically have no weight limit, only a size restriction. You can pack heavier items in your personal item as long as it fits under the seat in front of you. However, if your personal item is too large, the airline may ask you to check it.

Do overweight fees explore if I am flying first or business class?

No. Premium cabin passengers usually have higher baggage allowances and do not pay overweight fees for bags within those limits. First-class passengers might be allowed 70 or even 100 pounds per bag. Check your ticket or airline website to see what your specific cabin class allows.