Standard checked baggage dimensions and weight

Most U.S. airlines allow one checked bag up to 62 inches (length + width + height combined) and 50 pounds. This is the industry standard set by the International Air Transport Association, though individual airlines may differ slightly. The 62-inch limit means a bag measuring 28 × 21 × 13 inches would fit, as would 32 × 22 × 8 inches — the exact shape matters less than the total.

Weight limits are where airlines most often diverge. Domestic carriers like American, Delta, Southwest, and United allow 50 pounds for the first checked bag. Some budget airlines like Spirit and Frontier charge extra if your bag exceeds 40 pounds. International flights on U.S. carriers typically allow 50 pounds, but airlines based in other countries sometimes set 44 pounds as the limit, so check your specific airline's policy before packing.

A second checked bag usually costs $35 to $45 on domestic flights and may be included on international routes depending on your ticket class and airline. Bags beyond the second are charged per bag and can run $100 or more.

Key Takeaways

  • Standard checked baggage is 62 inches (length + width + height) and 50 pounds on most U.S. domestic flights.
  • Budget airlines often set lower weight limits (40 pounds) or smaller dimensions, so confirm your airline's rules before packing.
  • A second checked bag typically costs $35 to $45 on domestic flights; international policies vary by airline and ticket type.
  • Oversized or overweight bags are charged as excess baggage, with fees ranging from $50 to $200 depending on how far over the limit you are.
  • Soft-sided bags are easier to squeeze into overhead bins if you need to gate-check, but hard-sided luggage is more durable for checked travel.

How airlines measure and weigh your bag

At check-in, the agent will place your bag on a scale and measure it if it looks oversized. The scale reading is what matters for weight — if your bag reads 51 pounds, you are over the limit. Some airlines round down by a pound or two as a courtesy, but do not count on it.

For dimensions, airlines use a tape measure or a sizing frame at the counter. If your bag fits through the frame, it passes. If it does not, you will be charged an oversized baggage fee, typically $50 to $100 for the first overage. Soft-sided luggage can compress slightly to fit, but hard-sided cases cannot, so they are more likely to trigger a fee if they are close to the limit.

Differences between domestic and international flights

Domestic flights within the U.S. follow the 62-inch, 50-pound standard across most carriers. International flights departing the U.S. on American, Delta, United, or Southwest also use these limits for the first bag. However, if you are flying on a foreign airline or connecting through another country, the rules may change.

European and Asian carriers often use 23 kilograms (about 50 pounds) as the weight limit but may set the dimension limit at 158 centimeters (about 62 inches) — the same as U.S. carriers. Some Middle Eastern and Asian airlines allow two checked bags at 23 kilograms each on economy tickets, which is more generous than U.S. carriers. Always check your airline's website or confirmation email before you pack, because the rules depend on which airline operates your flight, not which country you are flying to.

What happens if your bag is overweight or oversized

If your bag exceeds the weight or size limit, you will be charged an excess baggage fee at check-in. Fees vary: most U.S. airlines charge $50 for the first 50 pounds of overage, then $100 for each additional 50 pounds. Some airlines charge a flat fee ($75 to $150) for any bag over the limit, regardless of how much over.

You cannot pay the fee and move on if the bag is dangerously heavy — airlines have weight limits for safety reasons, and bags over 100 pounds may be refused entirely. If your bag is too heavy, your options are to remove items at the counter and carry them on, ship items separately, or leave them behind.

Oversized bags (over 62 inches) are usually charged $50 to $100 per bag, and some airlines refuse to check them at all. If your luggage is close to the limit, pack lighter or choose a smaller bag to avoid the fee.

Luggage types and how they affect limits

Hard-sided luggage (polycarbonate or aluminum) is rigid and cannot compress, so it must fit the dimension frame exactly. Soft-sided luggage (fabric with flexible walls) can compress slightly, giving you a little extra room. Neither type changes the official limit, but soft-sided bags are more forgiving if you are a pound or two over or slightly exceed the dimensions.

Expandable luggage has a zipper that lets you increase the depth by 1 to 2 inches. When the expansion is zipped closed, the bag counts as its normal size. When expanded, it exceeds the limit and may be charged as oversized. Keep the expansion zipped during check-in if you are near the size limit.

Packing strategies to stay within limits

Weigh your empty bag at home before you pack. Most luggage weighs 7 to 12 pounds, so you have roughly 38 to 43 pounds of items to pack if your limit is 50 pounds. Use a bathroom scale or a kitchen scale to check your total weight, then subtract the bag's weight to see how much room you have.

Roll clothes instead of folding them to save space. Wear your heaviest items (coat, boots, jeans) on the plane rather than packing them. Put heavier items (shoes, toiletries, electronics) at the bottom of the bag and lighter items on top to distribute weight evenly. If you are flying internationally and bringing gifts or souvenirs, pack them in your checked bag, not your carry-on, to avoid weight issues with your personal item.

Special items and baggage allowances

Sports equipment like skis, golf clubs, or bicycles often counts as a checked bag or is charged separately. Musical instruments may be allowed as a carry-on if they fit in the overhead bin, or checked if they are in a hard case. Strollers and car seats for infants are usually checked free and do not count against your baggage limit.

Mobility aids like wheelchairs and walkers are checked free. Medications and medical equipment are not counted as baggage. If you are traveling with specialized gear, contact your airline before your trip to confirm the rules — some airlines are more flexible than others, and knowing in advance prevents surprises at the counter.

Frequently Asked Questions

Can I check a bag that is slightly over 50 pounds?

You may be charged an excess baggage fee of $50 to $150, depending on your airline. Some agents show flexibility for bags 1 to 2 pounds over, but do not count on it. The safest approach is to weigh your bag at home and remove items if it is over the limit.

What if my luggage is larger than 62 inches but not heavy?

Size and weight are separate limits. An oversized bag will be charged an oversized baggage fee even if it weighs only 30 pounds. The fee is typically $50 to $100 per bag. If your luggage is close to the limit, use soft-sided luggage or pack less to avoid the charge.

Do carry-on bags count toward my checked baggage limit?

No. Your carry-on bag and personal item (purse, backpack, laptop bag) are separate from your checked baggage allowance. You can bring one carry-on and one personal item plus your checked bags, as long as each meets its own size and weight limit.

Can I check a bag for free on budget airlines?

Most budget airlines like Spirit and Frontier charge $30 to $45 for the first checked bag on domestic flights. Some offer a free checked bag if you purchase a higher ticket class or a baggage pass. Check your airline's website or ticket details to see what is included with your fare.

What is the weight limit for checked bags on international flights?

Most U.S. airlines allow 50 pounds for the first checked bag on international flights. Foreign airlines may use 23 kilograms (about 50 pounds) or allow two bags at that weight. The limit depends on your airline, not your destination, so check your booking confirmation or the airline's website.