You bought a suitcase labeled “carry-on size,” packed it carefully, and got to the gate feeling prepared.
Then the agent pointed to a metal sizer box, your bag did not fit, and you paid $50 to gate-check a bag you were sure would work.
The problem is not your bag. “Carry-on size” means different things on different airlines.
Carry-on only since 2014, I have seen this happen on every continent.
The fix is to check your specific airline’s number before you pack, not after.
The short version
- Most U.S. major carriers: 22 x 14 x 9 inches, no weight limit enforced.
- Budget carriers and most international airlines: smaller dimensions, weight limits actively enforced.
- Your bag needs to fit the strictest airline on your itinerary, not just the first leg.
- Measure packed (with wheels and handles), not the manufacturer’s label.
Find your airline below, check the dimensions, and measure your bag packed. Every major airline’s carry-on limit is listed by region so you can look up your flight in 30 seconds.
Not sure if your bag fits? Check it free with our luggage calculator.
U.S. Major Airlines
These airlines share nearly identical carry-on size limits.
If your bag fits on one, it fits on all of them.
| Airline | Carry-On Size Limit | Weight Limit | Personal Item |
|---|---|---|---|
| American Airlines | 22 x 14 x 9 in (56 x 36 x 23 cm) | None enforced | Yes, free |
| Delta | 22 x 14 x 9 in (56 x 36 x 23 cm) | None enforced | Yes, free |
| United | 22 x 14 x 9 in (56 x 36 x 23 cm) | None enforced | Yes, free |
| Southwest | 24 x 16 x 10 in (61 x 41 x 25 cm) | None enforced | Yes, free |
| JetBlue | 22 x 14 x 9 in (56 x 36 x 23 cm) | None enforced | Yes, free |
| Alaska Airlines | 22 x 14 x 9 in (56 x 36 x 23 cm) | None enforced | Yes, free |
Southwest is the outlier. Their dimensions are slightly larger than the industry standard, and they also allow two free checked bags.
If you are used to flying Southwest and switch to another airline, your bag might be an inch or two too wide.
Most U.S. major airlines do not weigh your carry-on. If the bag fits in the overhead bin, it flies.
The practical limit is whether you can lift it yourself.
U.S. Budget Airlines
Budget carriers generate revenue from baggage fees.
Their limits are stricter, and they enforce them more consistently.
| Airline | Carry-On Size Limit | Weight Limit | Carry-On Fee | Free Bag |
|---|---|---|---|---|
| Spirit | 22 x 18 x 10 in (56 x 46 x 25 cm) | None posted | $39 to $65+ | Personal item only |
| Frontier | 24 x 16 x 10 in (61 x 41 x 25 cm) | 35 lbs (16 kg) | $39 to $64+ | Personal item only |
| Allegiant | 22 x 16 x 10 in (56 x 41 x 25 cm) | None posted | $35 to $75+ | Personal item only |
| Sun Country | 24 x 16 x 10 in (61 x 41 x 25 cm) | 35 lbs (16 kg) | $30 to $55+ | Personal item only |
The catch: On Spirit, Frontier, and Allegiant, your only free bag is a personal item that fits under the seat.
Putting anything in the overhead bin costs extra.
If you want a carry-on in the overhead, you pay for it at booking (cheaper) or at the gate (most expensive).
Carry-on fees on budget airlines can double between booking and gate.
Always prepay if you know you need the overhead bin.
Personal item limits on budget airlines
Budget airlines also measure your personal item more strictly than major carriers.
- Spirit: 18 x 14 x 8 in (45 x 35 x 20 cm)
- Frontier: 18 x 14 x 8 in (45 x 35 x 20 cm)
- Allegiant: 16 x 15 x 7 in (40 x 38 x 18 cm)
A standard backpack usually fits Spirit and Frontier limits.
Allegiant is tighter.
If your personal item is too large, they will charge you for a carry-on.
Want a quick walkthrough of updated 2026 carry-on rules before we move into European carriers?
Watch this:
European Airlines
European carriers often have smaller dimensions and, unlike most U.S. airlines, they weigh your bag at the gate.
| Airline | Carry-On Size Limit | Weight Limit | Notes |
|---|---|---|---|
| Ryanair | 21.7 x 15.7 x 7.9 in (55 x 40 x 20 cm) | 10 kg (22 lbs) | Free bag is personal item only; overhead access requires Priority |
| EasyJet | 22 x 17.7 x 9.8 in (56 x 45 x 25 cm) | None posted | Overhead access requires Flexi/Up Front/Extra Legroom fare |
| British Airways | 22 x 17.7 x 9.8 in (56 x 45 x 23 cm) | 23 kg (50.7 lbs) | Generous weight limit |
| Lufthansa | 21.7 x 15.7 x 9.1 in (55 x 40 x 23 cm) | 8 kg (17.6 lbs) | Strictly enforced |
| Air France | 21.7 x 13.8 x 9.8 in (55 x 35 x 25 cm) | 12 kg (26.4 lbs) | Economy only |
| KLM | 21.7 x 13.8 x 9.8 in (55 x 35 x 25 cm) | 12 kg (26.4 lbs) | Same as Air France |
| Wizz Air | 15.7 x 11.8 x 7.9 in (40 x 30 x 20 cm) | 10 kg (22 lbs) | Free bag is very small; larger cabin bag requires Wizz Priority |
Ryanair and Wizz Air are the strictest.
Your free bag on Ryanair is a personal item that fits under the seat.
To use the overhead bin, you need Priority boarding (extra fee).
Wizz Air’s free bag is even smaller.
If you are flying these airlines, measure your bag before you leave home.
Weight enforcement is real on European carriers. Lufthansa agents regularly weigh bags at the gate.
If your bag is over 8 kg, you pay a fee or repack on the spot.
Asian and Middle Eastern Airlines
These carriers vary widely.
Some are among the most generous in the world, while budget Asian carriers are among the strictest.
| Airline | Carry-On Size Limit | Weight Limit | Notes |
|---|---|---|---|
| Emirates | 21.7 x 15 x 7.9 in (55 x 38 x 20 cm) | 7 kg (15.4 lbs) | Low weight limit, strictly enforced |
| Singapore Airlines | 21.7 x 15 x 9.1 in (55 x 38 x 23 cm) | 7 kg (15.4 lbs) | Economy; Business gets 2 bags |
| ANA (Japan) | 21.7 x 15.7 x 9.8 in (55 x 40 x 25 cm) | 10 kg (22 lbs) | Varies by aircraft size |
| Cathay Pacific | 22 x 14 x 9 in (56 x 36 x 23 cm) | 7 kg (15.4 lbs) | Similar to U.S. size, strict weight |
| AirAsia | 22 x 14 x 9 in (56 x 36 x 23 cm) | 7 kg (15.4 lbs) | Cabin bag requires pre-purchase |
| Qantas | 22 x 14.2 x 9.1 in (56 x 36 x 23 cm) | 7 kg (15.4 lbs) | Economy; Business gets 2 bags, 14 kg total |
The 7 kg limit is common across Asia and the Middle East. That is 15.4 pounds, which is roughly the weight of a packed carry-on before you add shoes and toiletries.
If you are flying Emirates, Singapore, or Cathay Pacific in economy, you need to weigh your bag at home.
A luggage scale is the easiest way to know your number before you get to the airport.
How Dimensions Are Measured
Airlines measure your bag including handles, wheels, and any external pockets.
This is important because:
- A suitcase marketed as “21-inch” might measure 22 or 23 inches with the wheels included.
- External pockets that bulge when packed add depth that counts toward the limit.
- Soft-sided bags can expand beyond their stated dimensions when full.
When you check your bag against the size chart above, measure the bag packed with a tape measure.
Include the wheels and handle.
Do not rely on the manufacturer’s stated dimensions.
Why this matters: a 21-inch suitcase usually measures 22 to 23 inches with the wheels included. Always measure the actual bag, not what the label promised.
How Enforcement Works
Enforcement varies by airline, route, and how full the flight is.
Strict enforcement (expect your bag to be measured or weighed):
- Ryanair, Wizz Air, Spirit, Frontier (revenue from fees)
- Lufthansa, Emirates, Singapore Airlines (consistent policy)
- Any full flight where overhead space is limited
Lenient enforcement (your bag usually flies if it looks reasonable):
- U.S. majors on domestic routes
- Half-empty flights
- Business and first class passengers
Gate enforcement vs. boarding enforcement: Some airlines check at the gate with a sizer box.
Others wait until boarding and ask you to gate-check if overhead bins are full.
Gate-checking is sometimes free, sometimes not. On budget carriers, it is almost never free.
For the full breakdown of what happens when your bag does not fit, see airline baggage rules explained.
See how strict Spirit Airlines gets about carry-on size at the gate:
How to Make Sure Your Bag Fits
- Find your airline in the charts above. If you are connecting through two airlines, check both. Your bag needs to fit the stricter limit.
- Measure your bag packed. Use a tape measure. Include wheels, handles, and external pockets. Do not trust the label on the suitcase.
- Weigh your bag if the airline has a weight limit. Most international and budget carriers enforce weight. A luggage scale costs less than a single overweight fee.
- If your bag is borderline, downsize. A carry-on that is 1 inch over might pass on a slow day and fail on a full flight.
If you are within an inch of the limit, you are gambling.
For the complete carry-on packing system, see the carry-on only packing guide.
- Check your airline’s website the week before you fly. Airlines update policies without much notice. The numbers above are current as of early 2026, but your airline’s website is always the final word.
The U.S. Department of Transportation requires airlines to disclose all baggage fees upfront, so the information should be easy to find on the airline’s booking page.
Check your airline, measure your bag packed, and weigh it if flying international or budget.
Those three steps prevent every size-related surprise at the gate.
12-year nomad, carry-on-only traveler across 5 continents, and creator of Organizing.TV.
I help you pack smaller, stress less, and actually enjoy the packing part of travel.
