Airline Carry-On Size Limits: Every Major U.S. Carrier Compared (2026)
Airline Carry-On Size Limits: Every Major U.S. Carrier Compared (2026)
Airline Carry-On Size Limits: Every Major U.S. Carrier Compared (2026)
Bottom line: Most major U.S. airlines cap carry-on bags at 22 x 14 x 9 inches — but the exceptions will cost you. Here's exactly what every carrier allows, who actually enforces it, and how to never get gate-checked again.
Carry-on rules sound simple until you're standing at the gate watching a Spirit agent stuff your bag into a metal sizer while 150 people stare. I dug into the current policies for every major U.S. airline so you don't have to decode five different FAQ pages.
Here's every airline side by side. Bookmark this table — it's the only one you'll need.
| Airline | Carry-On Size | Personal Item Size | Weight Limit | Basic Economy Carry-On? | Enforcement |
|---|---|---|---|---|---|
| American Airlines | 22 x 14 x 9 in | 18 x 14 x 8 in | None | Yes — included free | Moderate |
| Delta Air Lines | 22 x 14 x 9 in | 18 x 14 x 8 in | None | Yes — included free | Moderate |
| United Airlines | 22 x 14 x 9 in | 17 x 10 x 9 in | None | No — personal item only (domestic) | Strict on Basic Economy |
| Southwest Airlines | 24 x 16 x 10 in | 16.25 x 13.5 x 8 in | None | N/A — no basic economy fare | Relaxed |
| JetBlue Airways | 22 x 14 x 9 in | 17 x 13 x 8 in | None | No — Blue Basic = personal item only | Moderate to strict |
| Alaska Airlines | 22 x 14 x 9 in | Fits under seat (no published dims) | None | Yes — included on all fares | Moderate |
| Spirit Airlines | 22 x 18 x 10 in | 18 x 14 x 8 in | None listed | N/A — carry-on always costs extra | Very strict |
| Frontier Airlines | 24 x 16 x 10 in | 14 x 18 x 8 in | 35 lbs | N/A — carry-on always costs extra | Very strict |
| Hawaiian Airlines | 22 x 14 x 9 in | Fits under seat (no published dims) | 25 lbs | Yes — included on all fares | Moderate |
The standard for full-service carriers is 22 x 14 x 9 inches. Southwest and Frontier allow larger bags (24 x 16 x 10), though Frontier charges you for the privilege. Hawaiian is the only legacy carrier with a weight limit — 25 pounds.
American's carry-on limit is 22 x 14 x 9 inches, including wheels and handles. Your personal item can be up to 18 x 14 x 8 inches. No weight limit.
The good news: American still allows a free carry-on on Basic Economy fares, unlike United. The less good news: Basic Economy boards last (Group 8 or 9), so by the time you step on the plane, overhead bins are often full. Your bag gets gate-checked for free, but still — it defeats the purpose.
Enforcement is moderate. American has reportedly removed physical sizer bins at some gates, relying on gate agent judgment instead. At busy hubs like DFW and MIA, agents flag obviously oversized bags. At smaller airports, you'll usually walk right on.
If you're booking a cheap fare on American, use Autopilot's price tracking to watch for a Main Cabin drop. You'll board earlier — meaning your carry-on actually makes it overhead.
United's carry-on dimensions are the same 22 x 14 x 9 inches. But the personal item is notably smaller: just 17 x 10 x 9 inches. That's tighter than every other major carrier.
Here's the big one: United Basic Economy does not include a carry-on on domestic flights. You get one personal item that fits under the seat, and that's it. Try to bring a roller bag to the gate on a Basic Economy ticket and you'll pay a $65 gate-check fee. It's the strictest policy among the Big Three.
International Basic Economy is different — flights to South America, across the Atlantic, or across the Pacific do include a carry-on. But domestically, you're out of luck.
United Express regional jets add another wrinkle. Smaller overhead bins mean even a compliant carry-on might get gate-checked. It's free, but plan for it.
Delta matches the industry standard: 22 x 14 x 9 inches for carry-ons, with personal items fitting under the seat (roughly 18 x 14 x 8 inches). No weight limit.
Delta is arguably the friendliest of the Big Three on Basic Economy. Carry-ons are technically free on all fare classes, including Basic Economy. But — and this is important — Basic Economy passengers board last. On a full A321 or 737, overhead bins are gone by Group 8.
Delta has also started gate-checking bags more aggressively on full flights. Your bag is returned at the jet bridge, so it's painless — but it means your stuff spends the flight in the cargo hold. On regional Delta Connection flights with fewer than 50 seats, only a personal item is allowed onboard.
Southwest has the most generous carry-on dimensions of any major U.S. airline: 24 x 16 x 10 inches. Your personal item can be up to 16.25 x 13.5 x 8 inches. No weight limit, no fare restrictions — every ticket includes a carry-on and a personal item.
Southwest also still offers two free checked bags — making it the best option for heavy packers. Enforcement is relaxed. No sizer bins, and agents rarely challenge bags unless they're obviously oversized. The open-seating model means early boarders grab overhead space first, so check in exactly 24 hours before departure.
Spirit's carry-on dimensions are actually larger than most legacy carriers: 22 x 18 x 10 inches. But here's the catch — you always pay for it. Spirit's base fare (the Go fare) includes only a personal item (18 x 14 x 8 inches). A carry-on bag costs extra, and the price climbs the longer you wait to add it.
Buy it at booking: roughly $35-55 each way. Add it at the airport: up to $99. That gate price is not a typo.
Spirit is also one of the strictest enforcers in the industry. Physical sizer bins at every gate, agents actively checking bags before boarding. If your personal item doesn't fit the smaller sizer, you're paying carry-on or checked bag fees on the spot.
Alaska keeps it simple: 22 x 14 x 9 inches for carry-ons, no weight limit, and a carry-on is included on every fare class. They don't publish specific personal item dimensions — it just needs to fit under the seat.
Alaska is moderately strict on enforcement. They won't hassle you over a bag that's a quarter-inch over, but they do check visually, and on full flights, gate agents are more aggressive about tagging bags for gate-check.
Since Alaska and Hawaiian Airlines merged operations, their baggage policies remain distinct. If you're connecting between Alaska and Hawaiian metal, double-check which rules apply to each segment.
If you fly multiple airlines and don't want to think about this ever again, buy a bag that's 22 x 14 x 9 inches or smaller. That's the magic number.
It fits in every legacy carrier's overhead bin (American, Delta, United, Alaska, Hawaiian, JetBlue). It fits Southwest easily (they allow 24 x 16 x 10). And it technically fits Spirit and Frontier, too — their limits are actually slightly larger.
Most popular carry-on suitcases are designed around exactly these dimensions. A standard 21-22" spinner will clear every airline in this article.
One caveat: those measurements include wheels and handles. A bag marketed as "22 inches" might measure 22.5 or 23 with the wheels. Measure the total exterior yourself before flying, especially on strict enforcers like Spirit and Frontier.
Gate-checking isn't the end of the world, but it's annoying — especially if you packed fragile items or have a tight connection. Here's how to keep your bag overhead where it belongs.
Board early. Overhead bin space is first-come, first-served. Elite status, airline credit cards, and higher fare classes all get you earlier boarding. With Autopilot, you can track fare prices and jump on a deal that puts you in Main Cabin — earlier boarding, guaranteed overhead space.
Use a soft-sided bag when possible. A compressible duffel or backpack squeezes into half-full bins that won't fit a rigid spinner. Especially useful on regional jets.
Wheels forward, handle up. Most overhead bins are designed for bags to go in wheels-first. Proper orientation saves space for everyone.
Keep your personal item under the seat. Every personal item in the overhead bin takes space from someone's carry-on — and on a full flight, that someone might be you next time.
Fly off-peak. Tuesday and Wednesday flights mean more overhead bin space. Friday evening warriors are the most likely to get gate-checked.
Not all fares are created equal. Here's a quick breakdown of which basic economy tickets still include a carry-on and which don't:
A $30 savings on the fare means nothing if you're paying $65 to gate-check a bag you thought was free. This is where Autopilot earns its keep — set up a price watch and get alerted when Main Cabin drops close to Basic Economy pricing. You keep the carry-on, earlier boarding, and often a seat assignment for just $10-20 more.
Most U.S. airlines do not enforce a carry-on weight limit. The two exceptions: Frontier (35 lbs) and Hawaiian Airlines (25 lbs). Hawaiian occasionally weighs bags, especially on interisland flights.
Even without formal limits, you're expected to lift your own bag into the overhead bin unassisted.
The most common size is 22 x 14 x 9 inches (56 x 36 x 23 cm), including wheels and handles. American, Delta, United, JetBlue, Alaska, and Hawaiian all use this limit. Southwest allows 24 x 16 x 10.
A bag at 22 x 14 x 9 inches or smaller fits every major U.S. airline — it clears the strictest legacy carriers and easily fits Southwest, Spirit, and Frontier.
It depends. American and Delta include a carry-on on Basic Economy. United does not on domestic flights (personal item only). JetBlue Blue Basic also restricts you to a personal item. Southwest doesn't have a Basic Economy tier.
Spirit and Frontier — both use physical sizer bins, and gate fees reach $75-99. Among legacy carriers, United is strictest, especially with Basic Economy passengers bringing prohibited overhead bags.
Most U.S. airlines do not weigh carry-on bags. The exceptions are Frontier (35 lb limit) and Hawaiian Airlines (25 lb limit). International carriers, particularly in Europe and Asia, are more likely to weigh carry-ons at the gate.
On most airlines, yes — one carry-on in the overhead bin and one personal item under the seat. Exceptions: United Basic Economy (domestic) and JetBlue Blue Basic limit you to a personal item only. Spirit and Frontier charge separately for the carry-on.
A smaller bag that fits under the seat — purse, laptop bag, small backpack, or briefcase. Most airlines cap personal items around 17-18 x 13-14 x 8 inches. United's allowance (17 x 10 x 9 in) is the smallest among major carriers.
On legacy carriers, your bag is typically gate-checked for free and returned at the jet bridge. On budget carriers (Spirit, Frontier), you'll pay $75-99 at the gate — far more than pre-purchasing online.
Airline policies change. The information in this article was accurate as of May 2026, but always confirm directly with your airline before traveling. This article is for informational purposes only and does not constitute travel advice.
Ready to find the best fare — and know exactly what's included before you book? Try Autopilot to track prices, compare fare classes, and never overpay for a ticket that doesn't even let you bring a carry-on.
