What size pet carrier does United Airlines allow in the cabin?

United Airlines's recommended maximum in-cabin carrier is 18 × 11 × 11 in (soft) or 17.5 × 12 × 7.5 in for a hard-sided kennel. It must fit fully under the seat in front of you. Source: the United Airlines pet policy.

How much does United Airlines charge for an in-cabin pet?

$150 each way. Always confirm the current fee on the official United Airlines pet page before you fly.

Will my carrier actually fit under a United Airlines seat?

The published size fits most of the fleet, but real under-seat clearance varies by aircraft and seat. A collapsible or flexible-height carrier is the safest bet on tighter aircraft.

United Airlines in-cabin pet policy — and the carriers that fit

United Airlines allows small pets in the cabin in a carrier up to 18 × 11 × 11 in. Below: the official rules (cited), the honest under-seat caveat, and which carriers fit that limit.

Last verified 2026-07-03 · 8 of 15 carriers we track fit the published limit

United Airlines pet rules

Recommended max carrier (soft)	18 × 11 × 11 in
Max hard-sided kennel	17.5 × 12 × 7.5 in
Soft-sided required?	Soft recommended; hard allowed within its limit
In-cabin fee	$150 each way
Species allowed	dogs, cats
Pets	Pet must fit in the carrier fully under the seat in front of you
Booking	Add your pet when booking or via Reservations

Source: official United Airlines pet policy · verified 2026-07-03

Carriers that fit United Airlines

Matched to United Airlines's published 18 × 11 × 11 in limit (height checked strictly; footprint may rotate). See the full United Airlines carrier shortlist →

Carrier	Size	Fit	Buy
Sherpa Original Deluxe (Small)	15 × 10 × 8.5 in	Fits	See on Amazon →
Mr. Peanut's Gold Series Mini (Low-Profile)	16 × 10.5 × 9.8 in	Fits	See on Amazon →
Petmate Soft-Sided Kennel Cab (Small)	17 × 10 × 10 in	Fits	See on Amazon →
Sherpa Original Deluxe (Medium)	17 × 11 × 10.5 in	Fits	See on Amazon →
Sleepypod Atom	17 × 8.5 × 10.5 in	Fits	See on Amazon →
Petsfit Expandable Soft-Sided	17 × 11 × 11 in	Fits	See on Amazon →
Bergan Comfort Carrier (Small)	16 × 8 × 11 in	Fits	See on Amazon →
Frisco Premium Airline-Compliant Carrier	18 × 11 × 11 in	Fits	See on Amazon →
Sleepypod Air	22 × 10.5 × 10.5 in	Fits collapsed	See on Amazon →
Diggs Passenger	17 × 12 × 10.5 in	Too big	See on Amazon →
Away The Pet Carrier	18.7 × 10.8 × 10.75 in	Too big	See on Amazon →
Sherpa Original Deluxe (Large)	19 × 11.75 × 11.5 in	Too big	See on Amazon →
Mr. Peanut's Gold Series Standard (Expandable)	18.5 × 11.75 × 11.5 in	Too big	See on Amazon →
SturdiBag Pro (Large, Flexible Height)	18 × 11.5 × 11.5 in	Too big	See on Amazon →
ibiyaya JetPaw Expandable Backpack	18 × 12 × 12 in	Too big	See on Amazon →

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How to confirm your actual under-seat space

United Airlines's number is a fleet-wide recommendation, not a promise for your exact seat. Before you buy or fly:

Check which aircraft operates your flight (in your booking or on a seat-map site).
Avoid bulkhead and some window seats — they have less (or no) under-seat storage.
Call United Airlines to confirm under-seat dimensions for that aircraft, or
Choose a collapsible / flexible-height carrier that adapts to a tighter space.

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