Weight limits depend on your airline and ticket type

Most airlines allow one checked bag weighing up to 50 pounds (23 kilograms) and one carry-on bag weighing up to 22 pounds (10 kilograms), but these limits vary by carrier and the class of ticket you bought. Budget airlines often charge extra fees for checked bags or enforce stricter weight caps. International flights may have different rules than domestic ones. The only way to know your exact limit is to check your airline's website or your booking confirmation before you pack.

Weight limits exist because heavier bags cost more to handle, load, and transport. Airlines measure both the total weight of your bag and its dimensions—a bag can be within the weight limit but still rejected if it is too large to fit in the overhead bin or cargo hold. Some airlines weigh bags at check-in; others do not, but you should assume they will.

Key Takeaways

  • Standard checked baggage limits are 50 pounds for most domestic and international flights, but budget carriers often charge extra or set lower limits.
  • Carry-on bags are typically capped at 22 pounds and must fit in the overhead bin or under the seat in front of you.
  • Your airline's website shows the exact weight and size limits for your specific ticket type and route.
  • Overweight bags incur fees that range from $25 to $200 per bag depending on how much over the limit you are and which airline you fly.
  • Some airlines offer paid options to increase your baggage allowance before you travel, which is usually cheaper than paying overweight fees at the airport.

Checked baggage weight limits by airline type

Full-service carriers (American, Delta, United, Southwest, Alaska) typically allow 50 pounds for the first checked bag on domestic flights. International flights on these airlines often follow the same 50-pound rule, though some routes to Europe or Asia may use a 70-pound limit or a two-bag allowance. The second checked bag, if you pay for it, usually has the same 50-pound limit.

Budget airlines (Spirit, Frontier, Allegiant) often charge $35 to $50 per checked bag and may set lower weight limits—sometimes 40 pounds instead of 50. Some budget carriers bundle a checked bag into higher-tier ticket packages. Read your confirmation email carefully, because "free checked baggage" on a budget airline sometimes means one bag only, not two.

International carriers (British Airways, Lufthansa, Air France, Japan Airlines) often use a two-bag system or a weight allowance of 50 to 70 pounds per bag. Some European and Asian airlines use a total baggage allowance (for example, 99 pounds total across two bags) rather than a per-bag limit. Check your booking confirmation or the airline's baggage page for your specific route.

Carry-on bag weight and size rules

Carry-on bags are measured by both weight and dimensions. Most airlines set a weight limit of 22 pounds (10 kilograms) for carry-on bags, but the size limit is enforced more strictly than weight. A standard carry-on must fit in the overhead bin, which is typically 22 inches long, 14 inches wide, and 9 inches tall. Some airlines have smaller overhead bins and enforce a smaller carry-on size.

In practice, airline staff at the gate check the size of your carry-on bag more often than they weigh it. A bag that is slightly over 22 pounds but fits the size requirement will usually be allowed. A bag that is the right weight but too large to fit in the bin will be gate-checked (sent to the cargo hold) even if you paid to bring it on board. Measure your bag before you travel and test it against the airline's sizer at the gate if you are unsure.

Personal items (purses, backpacks, laptops) do not count toward your carry-on allowance on most airlines. You can bring a personal item plus a carry-on bag. However, if your personal item is very large, staff may ask you to check it or combine it with your carry-on.

What happens if your bag is overweight

If your checked bag exceeds the weight limit, you will be charged an overweight fee at check-in. The fee structure varies by airline but typically follows this pattern: bags 1 to 20 pounds over the limit cost $25 to $50; bags 21 to 50 pounds over cost $100 to $150; bags over 50 pounds may be rejected entirely or charged $200 or more. Some airlines charge per pound once you exceed the limit.

Overweight fees are charged per bag, not per trip. If you have two checked bags and both are overweight, you pay the fee twice. These fees are non-refundable and are separate from any baggage fees you already paid. The only way to avoid them is to repack before check-in or pay for an upgraded baggage allowance before you arrive at the airport.

Carry-on bags are rarely weighed at check-in, so an overweight carry-on is unlikely to incur a fee. However, if a gate agent suspects your carry-on is too heavy, they may ask you to weigh it or may gate-check it without charging a fee (sending it to the cargo hold). This is more common on full flights or smaller aircraft.

How to avoid overweight bag fees

Weigh your bag at home before you leave for the airport. Most luggage stores, post offices, and grocery stores have scales you can use for free or a small fee. Weigh your bag packed and ready to go, because the weight of your clothes and items matters. If you are close to the limit, remove items or redistribute weight between bags if you have multiple bags.

Some airlines offer paid baggage upgrades before your flight. You can log into your booking online and pay $15 to $50 to increase your baggage allowance or add an extra checked bag. This is almost always cheaper than paying an overweight fee at the airport. Check your airline's website under "manage my booking" or "baggage" to see what upgrades are available for your flight.

If you are traveling with a companion, you can sometimes split weight between your bags. For example, if one person's bag is 55 pounds and the other's is 45 pounds, you could move 5 pounds from the first bag to the second, bringing both within the 50-pound limit. This works only if both passengers are on the same reservation or traveling together.

Special rules for oversized or unusually heavy items

Sports equipment (skis, golf clubs, surfboards), musical instruments, and other oversized items often have separate rules. Some airlines allow these items as checked baggage without charging extra if they fit within the weight limit. Others charge a sports equipment fee ($50 to $150) in addition to standard baggage fees. A few airlines count sports equipment toward your baggage allowance and charge overweight fees if the item is too heavy.

Bicycles, for example, are usually charged a flat fee ($50 to $100) rather than weighed. A golf bag might be allowed as a checked bag with no extra fee, or it might count as your second checked bag. Always contact your airline before you travel if you are bringing sports equipment, because the rules vary widely and fees can add up quickly.

Fragile items (artwork, glassware, electronics) are not exempt from weight limits, but some airlines offer special handling or insurance for an additional fee. Packing fragile items in a sturdy box or hard case adds weight, so factor that into your total. If your fragile item is very heavy, you may need to ship it separately rather than check it.

Frequently Asked Questions

Can I bring two carry-on bags instead of one?

No. Most airlines allow one carry-on bag plus one personal item (purse, laptop bag, backpack). If you bring two full-size carry-on bags, the second will be gate-checked. A personal item is typically smaller than a carry-on—think laptop bag or small backpack, not a second rolling suitcase.

Do airlines weigh carry-on bags?

Rarely. Airlines weigh checked bags at the counter, but carry-on bags are usually only checked for size. If your carry-on fits in the overhead bin, it will be allowed even if it is slightly over the weight limit. However, do not assume this—if a gate agent suspects your bag is very heavy, they may ask you to weigh it.

What if I pack more than the weight limit but split it between two checked bags?

If each bag is within the weight limit, you are fine. For example, if the limit is 50 pounds per bag and you have 95 pounds of luggage, you can pack 48 pounds in one bag and 47 pounds in the other. You will pay for two checked bags (if your ticket includes only one), but you will not pay overweight fees.

Do airlines charge for overweight carry-on bags?

Not usually. Overweight fees explore to checked bags. Carry-on bags are charged based on size, not weight. If your carry-on is overweight but fits the size requirement, you will not be charged. If it is too large, it will be gate-checked, but you will not pay an overweight fee—you may pay a gate-check fee if your ticket did not include a carry-on.

Can I pay to increase my baggage weight limit before I fly?

Yes. Most airlines let you purchase baggage upgrades online before your flight. You can add a checked bag, increase the weight limit of an existing bag, or both. Log into your airline account under "manage booking" or "baggage" to see what options are available and their cost. This is usually cheaper than paying overweight fees at the airport.