Standard carry-on dimensions across U.S. airlines
Most major U.S. airlines allow a carry-on bag measuring 22 inches tall by 14 inches wide by 9 inches deep, which is the standard set by the International Air Transport Association (IATA). This size fits in the overhead bin on most commercial aircraft without requiring you to check the bag. However, some airlines enforce this limit strictly, while others are more lenient if your bag fits through the sizer frame at the gate.
The three airlines with the largest carry-on allowances are Southwest, JetBlue, and Alaska Airlines, which permit bags up to 24 inches by 16 inches by 10 inches. American, Delta, and United stick to the 22 by 14 by 9 standard. Budget carriers like Frontier and Spirit have smaller limits—typically 21 by 14 by 10 inches—and may charge a fee if your bag exceeds those dimensions.
Personal items (a purse, backpack, or small laptop bag) are separate from your carry-on and must fit under the seat in front of you. Airlines rarely measure personal items, but they should be noticeably smaller than your carry-on bag.
Key Takeaways
- The standard carry-on size across most U.S. airlines is 22 by 14 by 9 inches, though some carriers allow up to 24 by 16 by 10 inches.
- Budget airlines often have smaller carry-on limits and may charge fees for oversized bags, so check your specific airline's policy before packing.
- A personal item (backpack, purse, or small bag) travels separately and must fit under the seat in front of you.
- Wheels, handles, and pockets count toward the total dimensions, so measure your bag with all parts extended.
- If your bag is borderline, arriving early gives you the best chance of getting it in the overhead bin rather than being forced to check it at the gate.
How to measure your bag correctly
Measure your carry-on with a soft measuring tape or ruler, and include the wheels, handles, and any pockets that stick out. Measure the widest point of the bag in each direction—height from bottom to top, width from side to side, and depth from front to back. If your bag has a telescoping handle, extend it fully before measuring the height. Round up to the nearest half-inch.
Many luggage manufacturers list dimensions on their product pages or tags, but these are often rounded down. If you are buying a new bag, look for one labeled as carry-on compliant by the airline you fly most often. Brands like Away, Calpak, and Coolife make bags specifically sized to fit standard carry-on limits.
What happens if your bag is too large
If your bag exceeds the airline's carry-on limit, you have two options at the gate: check the bag for free (the standard procedure), or pay a checked baggage fee if you have already checked a bag. Some airlines charge $35 to $50 for a second checked bag. Gate agents use a sizer frame—a metal or plastic box at the gate—to test whether your bag fits. If it does not slide in easily, it will be checked.
Arriving early increases the odds that overhead bin space is still available and the gate agent has time to measure your bag before boarding. If you arrive during final boarding, gate agents are more likely to enforce size limits strictly because they need to clear the gate quickly.
Carry-on size limits by major airline
| Airline | Carry-On Dimensions | Personal Item |
|---|---|---|
| Southwest | 24 × 16 × 10 inches | Fits under seat |
| JetBlue | 24 × 16 × 10 inches | Fits under seat |
| Alaska Airlines | 24 × 16 × 10 inches | Fits under seat |
| American Airlines | 22 × 14 × 9 inches | Fits under seat |
| Delta Air Lines | 22 × 14 × 9 inches | Fits under seat |
| United Airlines | 22 × 14 × 9 inches | Fits under seat |
| Frontier Airlines | 21 × 14 × 10 inches | Fits under seat |
| Spirit Airlines | 21 × 14 × 10 inches | Fits under seat |
Packing tips to maximize your carry-on space
Roll your clothes instead of folding them to save space and reduce wrinkles. Place heavier items like shoes and toiletries at the bottom of the bag, and lighter items like socks and underwear on top. Use packing cubes or compression bags to organize clothes into sections and squeeze out air.
Wear your bulkiest item—a jacket, sweater, or boots—onto the plane instead of packing it. This frees up several inches of space in your bag. Keep your laptop, tablet, and chargers in your personal item so you can access them during the flight without opening your carry-on in the overhead bin.
International carry-on size differences
International flights often have stricter carry-on limits than domestic U.S. flights. European airlines typically allow 22 by 14 by 9 inches, matching the IATA standard. Some Asian carriers, including China Southern and Air China, enforce limits as small as 21 by 15 by 9 inches. If you are flying internationally, check your airline's website before packing, because oversized bags are more likely to be checked on long-haul flights.
Budget international carriers like Ryanair and EasyJet have particularly tight restrictions. Ryanair allows only 21 by 16 by 10 inches for a carry-on, and charges a fee if you bring a second bag. If you are flying with a budget carrier, consider checking a bag rather than fighting size restrictions at the gate.
Frequently Asked Questions
Can I bring a rolling suitcase and a backpack as my carry-on?
No. You are allowed one carry-on bag and one personal item. The rolling suitcase counts as your carry-on, and the backpack counts as your personal item. Both must fit within the airline's size limits. If you try to bring two full-sized bags, the gate agent will ask you to check one.
Do wheels and handles count toward the carry-on size?
Yes. Wheels, handles, pockets, and any other part of the bag that sticks out are included in the measurement. A bag that is 22 by 14 by 9 inches with the handle retracted may be 24 inches tall with the handle extended, which could exceed the limit on some airlines.
What if my bag fits the dimensions but looks too full?
As long as your bag fits through the sizer frame at the gate, the airline will allow it. Gate agents measure dimensions, not weight or how stuffed the bag looks. If your bag slides into the frame, it passes the test.
Can I bring a camera bag or medical equipment as a carry-on in addition to my regular bag?
This depends on the airline. Most allow one carry-on and one personal item, period. Some airlines make exceptions for medical equipment like CPAP machines or oxygen, but you must notify them when you book. Camera bags and other specialty bags do not receive exceptions—they count as either your carry-on or personal item.
Is there a weight limit for carry-on bags?
Most U.S. airlines do not enforce carry-on weight limits, only size limits. However, you must be able to lift your bag into the overhead bin yourself. If a gate agent thinks your bag is too heavy to safely store overhead, they may ask you to check it. International airlines sometimes do enforce weight limits, typically 15 to 22 pounds, so check your airline's policy if you are flying internationally.