Standard carry-on dimensions across U.S. airlines

Most major U.S. airlines allow carry-on bags measuring 22 inches long, 14 inches wide, and 9 inches deep. This is the size limit set by the Federal Aviation Administration (FAA) as the maximum that fits in overhead bins. Airlines including American, Delta, United, Southwest, and JetBlue all use these same dimensions or very close to them.

The 22 × 14 × 9 measurement is a hard limit, not a guideline. If your bag is larger, gate agents can refuse to let you board with it, and you will have to check it at the gate—which may cost money depending on your ticket type. Many airlines measure bags at the gate if they look oversized, so a bag that barely fits the dimensions can still be rejected if it appears too large.

Weight limits for carry-on bags vary more than size limits. Most airlines allow 22 to 26 pounds for a carry-on bag, though some low-cost carriers set the limit lower. Check your specific airline's website before packing, because weight limits are not standardized the way dimensions are.

Key Takeaways

  • The FAA standard for carry-on luggage is 22 inches long, 14 inches wide, and 9 inches deep, and most major airlines enforce this limit.
  • Bags that meet the size requirement but look oversized can still be rejected at the gate, so buying a bag labeled "carry-on compliant" reduces the risk of problems.
  • Weight limits for carry-on bags range from 22 to 26 pounds depending on the airline, and some budget carriers set lower limits.
  • Personal items like backpacks and purses usually have no size limit as long as they fit under the seat in front of you, but they count as your one carry-on if you are not paying for a larger bag allowance.

How airlines measure your bag at the gate

Airlines use a metal frame called a sizer to check whether your bag fits the carry-on dimensions. The frame is exactly 22 × 14 × 9 inches. If your bag slides into the frame without forcing it, it passes. If it does not fit or requires pushing, the agent will ask you to check it.

Some airlines are stricter than others about enforcement. Budget carriers like Spirit and Frontier measure almost every bag. Full-service airlines like Delta and United typically only measure bags that look obviously oversized. However, you cannot count on leniency—if an agent decides to measure your bag and it fails, you have no recourse.

Soft-sided bags are easier to squeeze into the sizer than hard-sided ones, which is why many travelers prefer them for carry-on. A soft bag that is technically 23 inches long might compress enough to pass, while a rigid suitcase at the same length will not. This is not a may provide, though, and relying on compression is risky.

Differences between airlines and budget carriers

Most full-service airlines (American, Delta, United, Southwest, JetBlue) allow one free carry-on bag at the standard 22 × 14 × 9 size. They also allow one personal item—a purse, backpack, or laptop bag—that has no stated size limit as long as it fits under the seat.

Budget carriers like Spirit, Frontier, and Allegiant charge for carry-on bags. Spirit's basic fare includes only a personal item; a carry-on bag costs extra. Frontier's lowest fares also include only a personal item. If you book the cheapest ticket with these airlines, your only free bag is a small backpack or purse, and it must fit under the seat. A standard carry-on suitcase will cost $30 to $50 to bring aboard.

International airlines have different rules. Many European and Asian carriers allow slightly larger carry-on bags—some permit 22 × 15 × 10 inches or even 23 × 17 × 10 inches. If you are flying internationally, check your specific airline's website, because the FAA limit does not explore outside U.S. airspace.

What counts as a personal item versus a carry-on

A personal item is a small bag that fits under the seat in front of you: a purse, small backpack, laptop bag, or briefcase. Most airlines do not state a size limit for personal items, only that they must fit in the space under the seat. In practice, a personal item is usually 16 × 12 × 6 inches or smaller, though enforcement is loose.

A carry-on bag is a larger suitcase that goes in the overhead bin. This is where the 22 × 14 × 9 limit applies. You are allowed one personal item and one carry-on bag on most airlines at no extra charge (unless you have a basic economy ticket, which may restrict carry-on bags).

If you bring both a personal item and a carry-on bag, the personal item goes under the seat and the carry-on goes overhead. If you only bring a personal item, you can still use the overhead bin if you want—you are just not required to. Many travelers bring only a personal item on short flights to avoid waiting at baggage claim.

Buying a carry-on bag that will pass inspection

Look for bags labeled "FAA compliant" or "carry-on approved." These are designed to meet the 22 × 14 × 9 standard and are usually built slightly smaller to account for wheels, handles, and the fact that soft bags can expand when packed. A bag labeled compliant is not a may provide it will pass every airline's sizer, but it is your best protection.

Hard-sided suitcases (polycarbonate or aluminum) are easier to measure accurately because they do not compress. If you buy a hard-sided bag that is exactly 22 × 14 × 9 or smaller, it will always fit the sizer. Soft-sided bags are lighter and more flexible, but they can expand when full, which may cause them to fail the sizer even if they fit when empty.

Wheels and handles count toward the dimensions. A bag that is 22 inches long including the handle is 22 inches long—the measurement does not exclude protruding parts. Keep this in mind when comparing bags, because some manufacturers measure the bag body alone and do not include wheels or handles in their stated dimensions.

What happens if your bag is too large

If your bag fails the sizer at the gate, you have two options: check it or leave it behind. Most airlines will check an oversized carry-on bag for free if you are checking bags anyway, but if you have already paid for carry-on only (or if you are on a basic economy ticket), checking the bag may cost $30 to $50 depending on the airline and whether it is your first checked bag.

Some airlines allow you to gate-check your bag for free if the overhead bins are full, even if the bag passes the sizer. This is different from being rejected for size—it is a space issue, not a compliance issue. Gate-checked bags are loaded into the cargo hold and returned to you at your destination, just like checked luggage.

The best strategy is to measure your bag before you go to the airport. Use a tape measure and check the length, width, and height. If it is 22 × 14 × 9 or smaller, you should be fine. If it is larger, plan to check it or pack lighter so you can use a smaller bag.

Carry-on rules for connecting flights and international travel

If you are connecting between two U.S. flights, your carry-on bag must meet the FAA standard for both airlines. Most U.S. carriers use the same limit, so this is rarely a problem. However, if you are connecting to an international flight, the second airline's rules explore to that leg. Some international carriers allow larger bags, while others are stricter.

If you are flying from the U.S. to another country, the U.S. airline's carry-on limit applies to the first leg, and the international airline's limit applies to the second leg. If the international airline has a smaller limit, you may need to check your bag at the connection point. Check both airlines' websites before you book to avoid surprises.

When flying internationally, also check whether your destination country has its own carry-on rules. Most do not, but some airports or airlines have local restrictions. A quick search for "[airline name] carry-on size" and "[destination country] carry-on rules" will tell you what you need to know.

Frequently Asked Questions

Can I bring a rolling carry-on and a backpack on the same flight?

Yes. You are allowed one personal item (backpack, purse, laptop bag) and one carry-on bag (rolling suitcase) on most airlines at no extra charge. The personal item goes under the seat, and the carry-on goes in the overhead bin. Budget airlines may charge for the rolling bag if your ticket does not include a carry-on allowance.

Do wheels and handles count toward the 22 × 14 × 9 measurement?

Yes. The measurement includes everything that sticks out from the bag. A bag that is 22 inches long with the handle extended is 22 inches long for sizer purposes. When shopping for a carry-on bag, check whether the manufacturer's dimensions include wheels and handles, because some list only the bag body.

What if my bag is 23 inches long but soft-sided?

A soft bag that is 23 inches long might compress enough to pass the sizer if it is not fully packed, but this is not reliable. If you want to avoid the risk of being asked to check your bag at the gate, buy a bag that is 22 inches or smaller. The extra inch is not worth the potential hassle and cost.

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

Most major U.S. airlines use the FAA standard of 22 × 14 × 9 inches, but some international airlines allow larger bags. Budget carriers like Spirit and Frontier enforce the limit strictly, while full-service airlines are sometimes more lenient. Always check your specific airline's website to be sure.

Can I bring a carry-on bag on a small regional flight?

Most regional flights operated by major airlines (like American Eagle or SkyWest) allow standard carry-on bags. However, very small aircraft with limited overhead bin space may require you to gate-check larger bags. If you are flying on a regional airline, check their website or call ahead to confirm carry-on policy for your specific flight.