What Size Luggage Airlines Actually Allow

Most U.S. airlines allow one carry-on bag measuring 22 by 14 by 9 inches and one personal item (purse, backpack, laptop bag) with no size limit as long as it fits under the seat in front of you. Checked bags are typically limited to 62 inches when you add length, width, and height together, though some airlines allow up to 80 inches. Weight limits are usually 50 pounds for the first checked bag and 70 pounds for the second, though budget carriers like Spirit and Frontier charge extra fees for checked bags at all.

These are the standard rules across major carriers — American, Delta, United, Southwest, and JetBlue — but the exact measurements and fees vary. International flights often follow the same carry-on limits but may have stricter checked bag allowances depending on the airline and destination. Budget airlines and regional carriers have tighter restrictions, so checking your specific airline's website before packing is the only way to avoid fees or having to repack at the gate.

Key Takeaways

  • Carry-on bags must fit in the overhead bin and are typically 22 by 14 by 9 inches; personal items like purses and backpacks go under the seat with no strict size limit.
  • Checked bags can be up to 62 inches (length plus width plus height) and weigh up to 50 pounds on most airlines, though some allow 80 inches and 70 pounds.
  • Budget airlines like Spirit, Frontier, and Allegiant charge fees for checked bags or have smaller carry-on allowances, so verify your airline's rules before packing.
  • International flights usually follow the same carry-on limits but may have different checked bag rules depending on the airline and which country you are flying to.
  • Airlines measure bags at the gate, and oversized carry-ons are gate-checked for free, but oversized checked bags may result in oversize fees of $50 to $200.

Carry-On Bag Dimensions and What Fits

The standard carry-on size across most major U.S. airlines is 22 inches long, 14 inches wide, and 9 inches deep. This is the size that fits in the overhead bin on a Boeing 737 or Airbus A320, the most common aircraft on domestic routes. If your bag is larger than these dimensions, it will not fit in the overhead bin and will be checked at the gate, though this is done for free — you do not pay a fee for an oversized carry-on.

Your personal item — a purse, small backpack, laptop bag, or briefcase — has no official size limit on most airlines. The rule is that it must fit under the seat in front of you. In practice, this means a bag roughly 18 by 14 by 8 inches or smaller will always fit. If you bring a larger personal item, you risk being asked to check it, especially on full flights when overhead bin space is tight.

Soft-sided bags (duffel bags, backpacks) compress slightly, so a bag that is technically 23 by 15 by 10 inches may still squeeze into the overhead bin. Hard-sided luggage (roller bags, hard-shell suitcases) does not compress, so it must be exactly within the limits or it will not fit. If you are borderline, soft-sided is the safer choice.

Checked Bag Size and Weight Limits

Most airlines allow checked bags up to 62 inches when you add the length, width, and height together. A standard large roller suitcase is typically 29 inches tall, 20 inches wide, and 12 inches deep, which adds up to 61 inches and fits within the limit. Some airlines, including Southwest and certain international carriers, allow up to 80 inches, which gives you more room for oversized or oddly shaped bags.

Weight limits are 50 pounds for the first checked bag on most carriers. A second checked bag, if the airline allows it, is usually limited to 50 pounds as well, though some airlines cap the second bag at 70 pounds. Bags over the weight limit incur oversize fees, typically $50 to $200 depending on how much over the limit and which airline you are flying.

International flights sometimes have stricter checked bag allowances. Some European and Asian carriers limit checked bags to 50 pounds and 62 inches, while others allow 70 pounds and 80 inches. Check your airline's website before packing, especially if you are flying to a country outside North America.

Budget Airlines and Smaller Carry-On Rules

Spirit, Frontier, and Allegiant have smaller carry-on limits than major carriers. Spirit and Frontier allow carry-on bags of 22 by 18 by 10 inches, which is larger than standard, but they charge fees for checked bags — $35 to $45 for the first bag on Spirit and Frontier, and $40 to $50 on Allegiant. If you bring a carry-on bag that does not fit their dimensions, you pay a gate fee of $35 to $75 to check it.

These airlines also charge for personal items on some fare types. If you book the absolute lowest fare on Spirit or Frontier, you may only be allowed a personal item and no carry-on bag. Checked bags are always paid extras on these carriers unless you have a higher fare class or a frequent flyer membership. Before booking a budget airline, add up the cost of bags to see whether it is actually cheaper than flying a major carrier.

How Airlines Measure and Enforce Size Limits

Airlines use a metal frame or sizer at the gate to check whether your carry-on fits the overhead bin. If your bag does not fit in the frame, it is gate-checked for free. You do not pay a fee for an oversized carry-on — the airline straightforward puts it in the cargo hold and gives it back to you at baggage claim. This happens frequently on full flights, so do not panic if your bag is checked at the gate.

Checked bags are weighed at the counter. If your bag is over the weight limit, you pay the oversize fee before it goes on the plane. Some airlines allow you to move items between bags to get under the limit, but others do not, so ask the agent before you unpack.

In practice, gate agents are lenient with carry-on bags that are slightly oversized, especially early in the boarding process when overhead bins are empty. If you arrive late to the gate or the flight is full, an agent is more likely to enforce the size limit strictly. Packing light and choosing a soft-sided bag reduces the risk of being asked to check your carry-on.

International Flights and Airline-Specific Rules

Most international airlines follow the same carry-on limit of 22 by 14 by 9 inches, but checked bag rules vary. British Airways allows 62 inches and 50 pounds for economy passengers. Lufthansa allows 62 inches and 50 pounds. Air Canada allows 62 inches and 50 pounds. Some carriers, including KLM and Air France, allow 80 inches for checked bags, giving you more flexibility for larger suitcases.

If you are flying to Asia, Australia, or the Middle East, check your specific airline's baggage policy before packing. Some carriers in these regions have stricter weight limits or charge for second checked bags. The airline's website will have a baggage section with exact dimensions and fees.

If you are connecting through a hub airport, use the strictest baggage rules of any airline on your itinerary. If you fly American to London and then British Airways to Paris, follow American's rules for the entire trip, even though British Airways may allow larger bags on the London-to-Paris leg.

Tips for Packing Within Size Limits

Measure your luggage before you travel. Use a tape measure or a luggage sizer (available online for $10 to $20) to confirm your bag fits the airline's dimensions. Many luggage stores and airports have sizers you can use for free. If your bag is borderline, test it in the overhead bin at the airport before you check in — most airports have a sample bin near the ticket counter.

Choose soft-sided luggage for carry-on bags. Soft-sided bags compress slightly and are more forgiving of size limits than hard-shell suitcases. For checked bags, hard-shell luggage is more durable and protects your belongings better, so the size trade-off is worth it.

Pack heavier items in your carry-on and lighter items in checked bags. Carry-on bags have no official weight limit, so you can pack them as heavy as you can lift. This keeps your checked bags under the weight limit and gives you access to essentials during the flight.

Frequently Asked Questions

What happens if my carry-on bag is too big?

The airline gate-checks it for free and gives it back to you at baggage claim. You do not pay a fee. This is common on full flights, so do not worry if it happens. Arriving early to the gate reduces the chance of this happening because overhead bins are fuller later in the boarding process.

Can I bring a rolling suitcase as a personal item?

Only if it fits under the seat in front of you. Most rolling suitcases are too large for this, so they count as carry-on bags instead. A small roller bag (18 by 14 by 8 inches or smaller) may fit under the seat, but a standard carry-on roller suitcase will not. Test it at the airport before boarding.

Do I pay extra if my checked bag is 1 pound over the weight limit?

Yes, most airlines charge an oversize fee for any bag over the limit, even by 1 pound. Fees range from $50 to $200 depending on how much over and which airline. Some airlines allow you to redistribute items between bags to get under the limit, so ask the agent at the counter before you pay the fee.

Are carry-on size limits the same on all airlines?

The standard is 22 by 14 by 9 inches on most major U.S. carriers, but budget airlines like Spirit and Frontier have slightly different limits. International airlines vary, so check your specific airline's website. The difference is usually only an inch or two, but it matters if your bag is borderline.

What if I am flying internationally with a connection?

Use the strictest baggage rules of any airline on your itinerary. If you fly two different airlines, follow the rules of the airline with the smaller allowance for the entire trip. Check both airlines' websites before packing to avoid surprises at the gate.