Standard carry-on dimensions across major airlines

Most U.S. airlines allow carry-on bags measuring 22 inches long by 14 inches wide by 9 inches deep. This is the size limit set by the International Air Transport Association (IATA), which most major carriers follow. However, some airlines enforce slightly different limits, so the actual number varies by carrier.

American Airlines, Delta, United, and Southwest all use the 22 × 14 × 9 inch standard. Budget carriers like Spirit and Frontier sometimes allow smaller bags in their base fares—typically 21 × 14 × 10 inches—and charge extra for larger carry-ons. International airlines may use centimeters instead: 55 × 40 × 20 centimeters is roughly equivalent to the 22 × 14 × 9 inch standard.

The measurement includes wheels, handles, and pockets. If your bag exceeds the limit by even an inch in any dimension, gate agents can require you to check it. Soft-sided bags compress slightly, which sometimes allows them to fit when hard-sided bags of the same stated size would not, though this is not may provide.

Key Takeaways

  • The standard carry-on size is 22 inches long by 14 inches wide by 9 inches deep on most U.S. airlines.
  • Budget carriers often enforce smaller limits or charge extra for carry-ons, so check your specific airline's policy before packing.
  • The measurement includes wheels, handles, and all protruding parts—a bag that is 23 inches long will be rejected even if it is only 1 inch over.
  • Soft-sided bags may compress enough to fit when hard-sided bags would not, but airlines do not may provide this will work.
  • International flights may list dimensions in centimeters (55 × 40 × 20 cm) rather than inches, so convert before buying a bag.

How to measure your own luggage

Use a soft measuring tape or a rigid ruler and measure from the outermost point in each direction. Measure the length from the bottom of the bag to the top of the handle when the handle is fully extended, the width from side to side at the widest point, and the depth from front to back including any front pockets or protruding zippers.

If your bag has wheels, measure from the bottom of the wheels to the top of the handle. If it has a telescoping handle, measure with the handle fully extended, since that is the position it will be in when you carry it through the airport. Write down all three numbers and compare them to your airline's stated limits before you travel.

What happens if your bag is too large

Gate agents check bag size at the boarding gate using a sizing frame—a metal or plastic box in the airline's carry-on dimensions. If your bag does not fit through the frame, you will be asked to check it. This happens most often during busy travel periods when overhead bin space is limited, though technically airlines can enforce size limits any time.

Checking a bag usually costs money on budget carriers and is free on most full-service airlines if you have not already checked a bag. The fee varies by airline and can range from $30 to $75 for the first checked bag on low-cost carriers. If you find out at the gate that your bag is too large, you will have only a few minutes to decide whether to pay the fee or repack into a smaller bag if one is available.

Personal items versus carry-on bags

Most airlines allow one personal item (a purse, backpack, or small bag) in addition to one carry-on bag. Personal items are typically smaller—around 18 × 14 × 8 inches—and must fit under the seat in front of you. Your carry-on bag goes in the overhead bin.

If you only bring a personal item, you are not using your full carry-on allowance. If you bring both a personal item and a carry-on bag at the maximum size, you are using both your allotted spaces. Some travelers pack light enough to fit everything into a personal item to avoid the overhead bin entirely and speed up boarding and deplaning.

Bags that reliably fit the standard

Luggage marketed as "carry-on" or "22-inch" is designed to meet the standard 22 × 14 × 9 inch limit. Brands like Away, Coolife, and Samsonite make bags specifically sized to these dimensions. Hard-sided spinner bags (bags with four wheels that rotate) tend to be more rigid and less likely to compress, so they are more likely to be rejected if they are even slightly oversized.

Soft-sided bags with two wheels or backpack-style carry-ons have more give and may squeeze through even if they are slightly over the limit. However, this is not something to rely on—if a bag is marketed as larger than 22 × 14 × 9 inches, it may not fit, and you could face a checked bag fee at the gate.

Checking your airline's specific policy

Before you buy or pack a bag, visit your airline's website and search for "carry-on baggage" or "baggage policy." The policy page will list the exact dimensions, any exceptions for elite frequent flyer members, and whether soft-sided bags are treated differently from hard-sided ones. Some airlines also list the maximum weight for carry-on bags, which is usually 40 to 50 pounds.

If you are flying on a connecting flight with two different airlines, both airlines' policies explore to your bag. Your bag must fit the carry-on dimensions of the most restrictive airline on your itinerary. If you are unsure, contact the airline directly or measure your bag against the standard 22 × 14 × 9 inch dimensions to be safe.

International carry-on rules

European and Asian airlines often use the IATA standard of 55 × 40 × 20 centimeters, which converts to approximately 21.7 × 15.7 × 7.9 inches. This is slightly different from the U.S. standard—the length and width are similar, but the depth is smaller. Some international carriers are stricter about enforcing size limits than U.S. airlines are.

If you are traveling internationally, check your specific airline's baggage policy on their website. The policy will be listed in centimeters if the airline is based outside the United States. Converting between inches and centimeters can be confusing, so print out both the airline's dimensions and the U.S. standard and compare them side by side before packing.

Frequently Asked Questions

Can I bring a roller bag and a backpack as my carry-on and personal item?

Yes. One roller bag at the standard 22 × 14 × 9 inch size counts as your carry-on, and one backpack or purse counts as your personal item. Both go with you on the plane. If your backpack is large, measure it to make sure it fits under the seat in front of you, since personal items have stricter size limits than carry-ons.

Do airlines measure bags at check-in or only at the gate?

Most airlines only measure bags at the gate during boarding. If your bag fits through the sizing frame, it goes in the overhead bin. If it does not fit, you will be asked to check it. Some airlines measure at check-in on international flights, so your bag could be rejected before you even reach the gate.

What if I buy a bag that says 22 inches but it does not fit the sizing frame?

Bags marketed as "22 inches" usually refer to the length only, not all three dimensions. The width and depth may be larger than the airline's limits. Always check the full dimensions (length × width × depth) before buying, and compare them to your airline's stated policy, not just the length.

Are there any bags that fit every airline's carry-on limit?

Bags that meet the IATA standard of 55 × 40 × 20 centimeters (approximately 21.7 × 15.7 × 7.9 inches) will fit most airlines worldwide. However, some budget U.S. carriers have smaller limits, so a bag that fits international standards might not fit Spirit or Frontier. If you fly multiple airlines, choose a bag that meets the smallest limit you encounter.

Do I need to remove my carry-on from the overhead bin during the flight?

No. Once your bag is stowed in the overhead bin, it stays there for the entire flight. You only remove it when you reach your destination. If you need something during the flight, pack it in your personal item instead, which stays with you under the seat.