Checked baggage weight limits vary by airline and ticket type

Most major U.S. airlines allow one checked bag at 50 pounds and a second at 50 pounds, but some carriers permit up to 70 pounds per bag. Budget airlines like Spirit and Frontier often set lower limits — typically 40 pounds for the first bag — and charge extra fees if you go over. International flights may have different rules depending on the airline and destination country.

The weight limit applies to the bag itself plus everything inside it. If your bag weighs 48 pounds empty and you pack 5 pounds of clothes, you have hit the 50-pound mark. Airlines measure this at check-in with a scale, and if your bag is over the limit, you will pay an overage fee — usually $50 to $200 per bag, depending on how much over and which airline you are flying.

First-class and business-class tickets often come with higher limits or additional free bags. Military personnel, airline employees, and frequent flyer elite members may also get exceptions. Always check your specific airline's policy before packing, because the rules differ even among the "big three" carriers (American, Delta, United).

Key Takeaways

  • Standard checked baggage limits are 50 pounds per bag on most major U.S. airlines, though some allow 70 pounds.
  • Budget airlines often set lower limits of 40 pounds and charge fees for overage, sometimes $50 or more per pound over the limit.
  • The weight limit includes the bag itself, not just the contents, and is measured at the airport check-in counter.
  • Premium cabin tickets, military status, and elite frequent flyer status may come with higher weight allowances or additional free bags.
  • International flights may have different weight limits based on the airline and the country you are traveling to.

Weight limits by major U.S. airline

American Airlines allows 50 pounds for the first two checked bags in economy. Delta permits 50 pounds for the first bag and 50 pounds for the second. United also allows 50 pounds per bag for the first two checked bags. All three charge overage fees if you exceed the limit, typically $100 for the first overage and $200 for each additional bag over the limit.

Southwest Airlines includes two free checked bags with all ticket types, each up to 50 pounds. This is unusual — most airlines charge for a second bag. Alaska Airlines allows 50 pounds for the first bag and 50 pounds for the second, with the second bag charged at $30 to $35 depending on your ticket type.

Spirit and Frontier, the largest budget carriers, set first-bag limits at 40 pounds and charge $35 to $45 for the first checked bag itself, plus overage fees if you go over 40 pounds. JetBlue allows 50 pounds for the first bag and 50 pounds for the second, with the second bag free if you have a higher-tier ticket or are a frequent flyer member.

What happens if your bag is overweight

When you check in at the airport, the agent will place your bag on a scale. If it exceeds the airline's limit, you will be told the overage fee before you can proceed. You have three options: pay the fee, remove items from the bag and repack, or leave items behind. Most airports have a trash bin near the check-in counter if you choose to discard things.

Some airlines charge a flat fee for any overage (for example, $100 if you are even one pound over), while others charge per pound. A few airlines allow you to move items to a carry-on bag if you have room, though this only works if your carry-on is not already at the weight limit. If you are flying with a companion, you may be able to redistribute weight between your bags, but the agent will still weigh each bag separately.

Overage fees are not refundable and do not carry over to future flights. If you pay $100 for an overweight bag on one trip, that fee applies only to that flight. Plan ahead by weighing your packed bag at home on a bathroom scale before you leave for the airport.

How to avoid overage fees

Weigh your packed bag at home using a bathroom scale or a luggage scale (available at most drugstores for $15 to $30). Do this the night before your flight so you have time to repack if needed. Place heavier items like shoes and toiletries at the bottom of the bag, and pack lighter items like clothing on top — this does not change the total weight, but it can help you visualize what is taking up space.

If you are packing for a long trip and expect to exceed 50 pounds, consider shipping items to your destination instead. UPS, FedEx, and USPS all offer ground shipping that costs less than an airline overage fee for moderate distances. A 40-pound box shipped via UPS ground from New York to Los Angeles costs roughly $60 to $80, which is less than most overage fees.

Another option is to pack only essentials in your checked bag and use a personal item (purse, backpack, or small bag) for additional items. Most airlines allow one personal item free, in addition to your carry-on and checked bags. A personal item typically has a 16-inch by 14-inch by 8-inch size limit, but the weight limit is usually not enforced as strictly as it is for checked bags.

International flight weight limits

International flights operated by U.S. airlines usually follow the same 50-pound limit as domestic flights. However, some international carriers use a different system: they allow two checked bags with a combined weight limit of 110 pounds (50 kilograms per bag in metric countries). Airlines based in Europe, Asia, and the Middle East often use this 50-kilogram-per-bag system, which is about 110 pounds.

If you are flying on a foreign airline or a code-share flight (where two airlines share the flight number), check the operating airline's policy, not the airline you booked through. For example, if you book a flight on American Airlines but it is operated by a partner airline, the partner's weight rules explore. Your airline confirmation email should state which airline operates the flight.

Some countries have their own regulations that override airline policy. Certain African and South American carriers may have lower limits or charge differently. Always verify the weight limit on your airline's website or by calling their customer service before packing, especially for international travel.

Oversized and overweight bag fees

Some airlines charge separate fees for bags that are both overweight and oversized. A bag is typically considered oversized if it exceeds 62 inches in length plus width plus height (the sum of all three dimensions). If your bag is 65 inches and weighs 55 pounds, you may pay both an oversized fee and an overweight fee — sometimes $100 to $200 total.

A few airlines, like Southwest, do not charge oversized fees as long as the bag closes and fits in the overhead bin or under the seat. Most others do charge. Measure your bag before you pack it: use a soft measuring tape and measure the longest point of each side, then add the three numbers together. If the total is over 62 inches, expect an oversized fee in addition to any overage charges.

Hard-sided luggage (like polycarbonate or aluminum) is often heavier than soft-sided luggage (like nylon), so if you are close to the weight limit, a soft-sided bag may help you stay under. A typical hard-sided carry-on weighs 6 to 8 pounds empty, while a soft-sided one weighs 4 to 6 pounds.

Frequently Asked Questions

Can I pack heavier items in my carry-on to avoid checked baggage fees?

Carry-on bags have weight limits too, though they are rarely enforced at check-in. Most airlines set a 22-pound limit for carry-on bags, but agents usually do not weigh them unless the bag looks unusually heavy or the flight is full. If you move weight from checked to carry-on, you risk having the agent ask you to check the bag anyway, which defeats the purpose.

What if I have a connecting flight with a different airline?

Each airline's weight limit applies to the segment you fly with them. If you fly American to Chicago and then United to Denver, your bag must meet American's limit for the first flight and United's limit for the second. Most bags that meet one major airline's limit will meet another's, but verify both airlines' policies if you are flying budget carriers or international airlines.

Do sports equipment and musical instruments count toward the weight limit?

Yes, they count as checked baggage and must meet the weight limit. A golf bag, ski bag, or instrument case is treated like any other checked bag. Some airlines allow one sports item as a second free checked bag if you have a higher-tier ticket, but the item still cannot exceed the weight limit. Call your airline ahead of time if you are traveling with expensive or fragile sports gear.

Can I pay extra to check a third bag?

Most airlines allow you to check additional bags for a fee, usually $100 to $200 per bag depending on the airline. Each bag must still meet the weight limit. Some airlines cap the number of bags you can check (for example, five bags maximum), so verify this before you pack multiple bags.

What is the weight limit for checked bags on budget airlines like Spirit?

Spirit allows 40 pounds for the first checked bag and charges $35 to $45 for that bag. Frontier allows 40 pounds for the first bag and charges $30 to $40. Both charge overage fees if you exceed 40 pounds. If you fly budget airlines regularly, factor in these lower limits and higher fees when deciding what to pack.