What size carry-on fits on all US airlines?

22" x 14" x 9" including wheels and handles fits most US airlines.

  • Budget airlines (Frontier, Spirit): stricter, 18" x 14" x 8" for free carry-on
  • International low-cost (Ryanair, EasyJet): much smaller, 21.5" x 15.5" x 7.9" maximum
  • Soft-sided bags compress to fit more easily than hard-shell
  • Wheels and handles count toward total dimensions on every airline

Official resource: TSA Carry-On Guidelines

Traveling soon? See our Travel Essentials page.

Want a deeper dive? ↓

Detailed Answer

How It Works

There is no single universal carry-on size mandated by law in the US. Each airline sets its own limits and enforces them with varying degrees of strictness. The 22" x 14" x 9" standard has become a de facto industry norm among major US legacy carriers because it fits the overhead bins on most Boeing and Airbus aircraft they operate. Staying within this size works for American, Delta, United, Alaska, and Hawaiian Airlines without any issue.

Budget carriers operate differently. Spirit and Frontier both restrict free carry-on bags to smaller personal item dimensions. On these airlines, a standard 22" x 14" x 9" bag requires a paid carry-on upgrade. Bringing the wrong size without paying for it results in a gate check fee that is almost always more expensive than buying the upgrade in advance.

International low-cost carriers like Ryanair and EasyJet are the strictest of all. Their allowances are based on European overhead bin sizes which are smaller than US domestic aircraft. A bag that flies free on Delta can cost £40 or more as a bag fee on Ryanair. Knowing the rules before you pack is the single most important thing you can do to avoid unexpected costs.

Carry-On Size by US Airline

  • American Airlines: 22" x 14" x 9" including handles and wheels
  • Delta Air Lines: 22" x 14" x 9" including handles and wheels
  • United Airlines: 22" x 14" x 9" including handles and wheels
  • Alaska Airlines: 22" x 14" x 9" including handles and wheels
  • Southwest Airlines: 24" x 16" x 10", most generous allowance of any major US carrier
  • JetBlue: 22" x 14" x 9" including handles and wheels
  • Spirit Airlines: carry-on bag costs extra, personal item free at 18" x 14" x 8"
  • Frontier Airlines: carry-on bag costs extra, personal item free at 18" x 14" x 8"
  • Allegiant Air: 22" x 16" x 10", carry-on fee applies for basic fares

Carry-On Size by International Airline

  • Ryanair: 40cm x 20cm x 25cm (15.7" x 7.9" x 9.8") for free personal item, larger bag requires Priority boarding purchase
  • EasyJet: 45cm x 36cm x 20cm (17.7" x 14.2" x 7.9") for free cabin bag
  • British Airways: 56cm x 45cm x 25cm (22" x 17.7" x 9.8")
  • Lufthansa: 55cm x 40cm x 23cm (21.6" x 15.7" x 9")
  • Emirates: 55cm x 38cm x 20cm (21.6" x 15" x 7.9")
  • Air Canada: 23cm x 40cm x 55cm (9" x 15.7" x 21.6")
  • Qantas: 56cm x 36cm x 23cm (22" x 14.2" x 9")

What You Need to Know

  • Dimensions always include wheels, handles, and any exterior pockets, measure your bag fully packed
  • Soft-sided bags are more forgiving than hard-shell because they compress slightly to fit tight overhead bins
  • Gate agents have discretion to enforce size rules more strictly on full flights, a bag that passes on a quiet route may be checked on a busy one
  • Basic economy fares on American, Delta, and United often restrict carry-on bags to personal items only, check your fare type before assuming a full-size carry-on is included
  • Spirit and Frontier charge carry-on fees that are cheapest when added at booking, most expensive when paid at the gate
  • Most airlines allow one carry-on plus one personal item, personal item must fit under the seat in front of you
  • Personal item standard size across most US airlines: 18" x 14" x 8" or smaller

Hard-Shell vs Soft-Sided Carry-On

  • Hard-shell bags: protect contents better, easier to clean, dimensions are fixed and do not compress
  • Soft-sided bags: slightly flexible, can be squeezed into tight overhead bins, often lighter
  • For multi-airline travel: soft-sided bags reduce the risk of being gate-checked due to bin space issues
  • For single airline frequent flyers: hard-shell is fine if sized correctly for that carrier

Real Traveler Experiences

"Bought a 22" x 14" x 9" carry-on specifically for travel. It has flown on American, Delta, United, and JetBlue without a single issue. That size is the safe zone for US domestic travel."  Reddit r/solotravel

"Tried to bring my standard carry-on on Ryanair. Gate agent measured it and it failed. Paid £45 to check it at the gate. Always check the airline rules, not just the bag label."  TripAdvisor forum

"Spirit charged me $79 at the gate for a carry-on I did not pre-pay for. Same fee online at booking would have been $35. Never again."  Reddit r/travel

Pro Tips

  • Measure your bag fully packed with wheels and handles, not empty, dimensions change when full
  • If flying Spirit or Frontier, add the carry-on fee at the time of booking, it is always cheapest at that point
  • For multi-airline itineraries, size your bag to the most restrictive carrier on your trip, not the most lenient
  • Packing cubes compress clothing efficiently and help you stay within size limits without sacrificing what you pack
  • For Ryanair specifically, buy Priority boarding if you need overhead bin space, it is the only way to guarantee your bag travels in the cabin on a full flight
  • If your bag gets gate-checked on the way out, it will likely be gate-checked on the return too, factor that into your packing plan

Related Questions

Sources

AskTravel.org is an information website only. Always check local regulations and app availability before traveling, as rules change frequently.

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