What your luggage weight limit actually is
Your luggage weight limit depends entirely on which airline or train you are traveling with, because each carrier sets its own rules. Most U.S. airlines allow checked bags up to 50 pounds and carry-on bags up to 22 pounds, but some budget carriers charge extra fees if you exceed 40 pounds on a checked bag. Train services like Amtrak do not enforce strict weight limits the way airlines do — they care more about the number of bags than how heavy each one is.
The weight limit also changes based on your ticket type and destination. First-class passengers often get heavier allowances than economy passengers on the same flight. International flights may have different rules than domestic ones. Before you pack, you need to check your specific airline or train's website or your booking confirmation, because the number printed there is the one that matters for your trip.
Key Takeaways
- Most major U.S. airlines allow 50 pounds for checked bags and 22 pounds for carry-on bags, but budget airlines often set lower limits and charge fees for overweight luggage.
- Your ticket type, destination, and which airline you booked with all affect your weight allowance, so you must check your confirmation or the airline's website before packing.
- Train services like Amtrak typically do not weigh bags at all — they limit the number of bags per passenger instead.
- Overweight bag fees usually start at $35 to $50 per bag and increase for bags over 70 pounds, which some airlines refuse to accept at all.
- Scales at home or in the airport terminal let you check your bag weight before you reach the counter, which saves time and money.
Weight limits at major U.S. airlines
American Airlines, Delta, and United all allow checked bags up to 50 pounds and carry-on bags up to 22 pounds for standard economy tickets. Southwest Airlines follows the same 50-pound checked bag limit but does not charge for the first two checked bags, which is unusual among major carriers. Alaska Airlines also uses 50 pounds for checked bags.
Budget carriers like Spirit and Frontier set lower limits. Spirit allows 40 pounds for checked bags and charges $35 if your bag weighs 41 to 70 pounds. Frontier allows 50 pounds but charges $35 for bags over 50 pounds. Allegiant Air charges $40 for checked bags over 40 pounds. If your bag weighs more than 70 pounds, most airlines will not accept it at all, regardless of how much you are willing to pay.
First-class and business-class tickets usually come with higher weight allowances — sometimes 70 pounds per checked bag instead of 50. Military personnel, frequent flyer elite members, and passengers with certain credit cards may also get higher limits. Check your booking confirmation to see what your specific ticket includes.
Carry-on bag weight and size rules
Carry-on bags must fit in the overhead bin or under the seat in front of you, and weight is less important than size for these bags. Most airlines measure carry-on bags at 22 inches long by 14 inches wide by 9 inches deep, though some allow slightly larger bags. A bag that fits these dimensions will almost always be accepted, even if it weighs close to 22 pounds.
The 22-pound limit for carry-on bags is a soft rule — gate agents rarely weigh carry-on bags unless the bag is visibly oversized or the flight is completely full. If your carry-on bag is within the size limits and does not look stuffed, you can usually bring it on board even if it weighs a bit more. Checked bags, by contrast, are always weighed at the counter.
International flight weight limits
International flights often have different rules than domestic flights. Many airlines allow 70 pounds for checked bags on long international routes, while others stick to 50 pounds. Some international carriers, particularly those based in Europe or Asia, use kilograms instead of pounds — 23 kilograms equals about 50 pounds, and 32 kilograms equals about 70 pounds.
If you are flying from the United States to another country, check your airline's international baggage policy on their website. If you are flying from another country back to the United States, the U.S. airline's rules explore for the flight into the U.S., but the foreign airline's rules explore for the flight out. This matters because some international carriers are stricter than U.S. carriers.
Train luggage rules and weight
Amtrak does not enforce weight limits on luggage. Instead, each passenger is allowed two carry-on bags and two checked bags, regardless of how heavy they are. The bags must be a reasonable size — Amtrak staff will refuse bags that are so large they block aisles or take up multiple seats — but weight itself is not a factor.
Regional train services vary. Some commuter rail systems do not allow checked bags at all and only permit small carry-on bags. If you are taking a regional train, check that service's website for their specific rules. Amtrak is the main long-distance option in the U.S., and it is the most lenient about luggage weight.
What happens if your bag is overweight
If your checked bag exceeds the weight limit, you will be charged a fee at the airport counter. The fee is usually $35 to $50 for the first overweight bag, and it increases if your bag is significantly over the limit. Some airlines charge $100 or more for bags over 70 pounds. You cannot avoid this fee by checking in online — the weight is checked at the counter.
If you realize your bag is overweight before you get to the airport, you can repack it by moving items to a carry-on bag, shipping items ahead, or leaving items behind. Repacking at home is much faster and cheaper than paying the fee at the airport. If you are traveling with multiple people, you can also redistribute weight among bags so that no single bag exceeds the limit.
Some airlines allow you to purchase an extra checked bag allowance in advance, which costs less than the overweight fee. If you know you will have a heavy bag, buying an extra bag allowance online before your trip can save you money.
How to weigh your luggage before the airport
A bathroom scale at home is the easiest way to check your bag weight. Stand on the scale alone, note your weight, then stand on it while holding your bag and subtract your weight from the total. This method is accurate enough for packing purposes. If your scale does not go up to your weight, you can weigh yourself at a gym or doctor's office and then weigh your bag there.
Many airports have luggage scales in the terminal near the check-in counters, and some airlines have self-service bag drop machines that weigh your bag before you pay. If you arrive early, you can use these to check your weight and repack if needed. Some hotels also have scales available if you ask at the front desk.
Frequently Asked Questions
Can I bring two carry-on bags if one is a personal item?
Yes. Most airlines allow one standard carry-on bag plus one personal item like a purse, laptop bag, or small backpack. The personal item must fit under the seat in front of you. Both items count toward your carry-on allowance, but neither is weighed as long as they fit the size limits.
Do I get a free checked bag if I buy a basic economy ticket?
It depends on the airline. Southwest includes two free checked bags with all tickets. Most other major airlines charge $35 to $40 for the first checked bag on basic economy tickets, though you may get one free if you have their credit card or elite frequent flyer status. Budget airlines charge for checked bags on all ticket types. Check your airline's website to see what your ticket includes.
What if my luggage is 51 pounds and the limit is 50?
You will be charged an overweight fee, usually $35 to $50. The fee applies even if you are just one pound over. The only way to avoid it is to remove items from the bag before you check it in. If you are at the airport, you can move items to a carry-on bag or ask the airline if you can ship items instead.
Do airlines weigh carry-on bags at the gate?
Rarely. Gate agents focus on whether carry-on bags fit the size limits, not the weight. If your bag is within the size limits and does not look obviously overstuffed, it will almost always be accepted. Checked bags are always weighed at the counter, but carry-on bags are usually not.
Can I bring a suitcase on a train?
Yes. Amtrak allows two checked bags and two carry-on bags per passenger with no weight limit. Your bags should fit in the luggage racks above the seats or in the storage areas at the ends of the cars. Very large suitcases may not fit in these spaces, so a standard rolling suitcase works best.