Published limit
United Airlines
18 × 11 × 11 in
Rule source reviewed 2026-07-10.
In-cabin pet carrier fit · source-cited
Will your carrier fit under the seat?
Cabin Pet Fit compares each airline's published in-cabin pet-carrier limit against your carrier's listed dimensions, then shows the caveats plainly. No fit guarantees, no gate-side surprises. Just a calm, source-backed answer before you book.
Every rule shows its source and access date. We are not affiliated with any airline, and we never advise on your pet's health or fitness to fly.
14airlines with a published in-cabin limit
2no-published-limit / no-cabin-pets states
14source-cited carriers tracked
224computed carrier × airline fit rows
Under-seat clearance, to scale
What "fits under the seat" actually looks like.
Drawn from real published data — the airline's max envelope versus a carrier we track, at the same scale.
Published max envelope Sleepypod Atom Carrier (17 × 10.5 in)
United soft-sided in-cabin limit (18 × 11 × 11 in), accessed 2026-07-10. Soft-sided carriers can compress slightly; hard-sided cannot.
How it works
Three steps to a confident answer.
01Enter your carrier dimensionsType the length, width, and height in inches, or pick a carrier we already track.02See fit by airlineGet matches / tight / exceeds / unclear against each airline's published limit, with the source.03Trust the methodRead how fit is computed, how we handle soft vs hard carriers, and our affiliate disclosure.
Start with your airline
Airline in-cabin carrier limits
Airlines with a clear published limit first, then the rest. Last-reviewed dates stay visible because trust is a design element.
Published limit
American Airlines
18 × 11 × 11 in
Rule source reviewed 2026-07-10.
Published limit
Delta Air Lines
18 × 11 × 11 in
Rule source reviewed 2026-07-10.
Published limit
JetBlue
17 × 12.5 × 8.5 in
Rule source reviewed 2026-07-10.
Published limit
Alaska Airlines
17 × 11 × 9.5 in
Rule source reviewed 2026-07-10.
Published limit
Frontier Airlines
18 × 14 × 11 in
Rule source reviewed 2026-07-10.
Unclear rule
Southwest Airlines
No simple in-cabin carrier limit published
Rule source reviewed 2026-07-10.
Published limit
Allegiant Air
18 × 12 × 11 in
Rule source reviewed 2026-07-10.
Carriers
Carriers that clear the most published limits.
These are not universal winners. They are easy starting points because their listed dimensions compare cleanly across more airline records. Soft-sided flexibility is a plus, not a guarantee.
soft sided · up to 12 lbSleepypod Atom Carrier
Sleepypod Atom Carrier: soft sided carrier, external 17 x 8.5 x 10.5 in, rated to 12 lb.
- Matches
- 11 airline limits
- Tight / risky
- 1 airline limits
soft sided · up to 16 lbSherpa Original Deluxe Carrier (Medium)
Sherpa Original Deluxe Carrier (Medium): soft sided carrier, external 17 x 11 x 10.5 in, rated to 16 lb.
- Matches
- 5 airline limits
- Tight / risky
- 0 airline limits
soft sided · up to 16 lbWild One Travel Carrier
Wild One Travel Carrier: soft sided carrier, external 17.5 x 11 x 10 in, rated to 16 lb.
- Matches
- 5 airline limits
- Tight / risky
- 0 airline limits
soft sided · up to 16 lbAmazon Basics Soft-Sided Mesh Carrier (Medium)
Amazon Basics Soft-Sided Mesh Carrier (Medium): soft sided carrier, external 16.5 x 10.6 x 11 in, rated to 16 lb.
- Matches
- 5 airline limits
- Tight / risky
- 0 airline limits
Rule-change updates
Get notified when airline pet rules or carrier specs change.
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