In-cabin pet carriers that fit Discover Airlines
The carriers from our list that clear Discover Airlines' official 21.7 × 15.7 × 9.1 in under-seat limit — sorted best-fit first, with the ones that squeeze in when collapsed flagged.
Short answer: 6 of the 15 carriers we track fit Discover Airlines' 21.7 × 15.7 × 9.1 in limit: 2 with room to spare on every side and 4 only when collapsed or squeezed a little. 9 are too big.
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| Carrier | Size | Fit | Buy |
|---|---|---|---|
Sherpa Original Deluxe (Small) up to ~8 lb · max pet 13″ long × 7.5″ tall 15 × 10 × 8.5 in is within 21.7 × 15.7 × 9.1 in — 6.7" spare on length, 5.7" on width, 0.6" on height. · collapsible/flex | 15 × 10 × 8.5 in | Fits | See on Amazon → |
 Mr. Peanut's Gold Series Mini (Low-Profile) up to ~15 lb 17 × 11 × 9 in is within 21.7 × 15.7 × 9.1 in — 4.7" spare on length, 4.7" on width, 0.1" on height. Tightest margin is 0.1", so measure before you fly. · collapsible/flex | 17 × 11 × 9 in | Fits | See on Amazon → |
Mr. Peanut's Gold Series Standard (Expandable) up to ~20 lb 10" tall vs a 9.1" limit — 0.9" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 18 × 11 × 10 in | Flexes — 0.9" over | See on Amazon → |
Sherpa Original Deluxe (Medium) up to ~16 lb · max pet 16″ long × 9.5″ tall 10.5" tall vs a 9.1" limit — 1.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 17 × 11 × 10.5 in | Flexes — 1.4" over | See on Amazon → |
Sherpa Original Deluxe (Large) up to ~22 lb · max pet 18″ long × 10.5″ tall 11.5" tall vs a 9.1" limit — 2.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 19 × 11.75 × 11.5 in | Flexes — 2.4" over | See on Amazon → |
SturdiBag Pro (Large, Flexible Height) pet size not published 11.5" tall vs a 9.1" limit — 2.4" over, but the flexible-height top compresses down. Verify it squeezes under your actual seat. · collapsible/flex | 18 × 11.5 × 11.5 in | Flexes — 2.4" over | See on Amazon → |
Every fit is against the published maximum; real under-seat space varies by aircraft (why). Full rules & fees: Discover Airlines pet policy → · how Discover Airlines ranks on fee and space →
Other airlines: Edelweiss · EL AL Israel Airlines · Etihad Airways · Eurowings · Finnair · Frontier Airlines
Common questions
What size pet carrier does Discover Airlines allow in the cabin?
Discover Airlines' published limit for a carrier under the seat in front of you is 21.7 × 15.7 × 9.1 in. The carrier must be soft-sided. Weight limit: Max 8 kg (animal + bag). We last checked this against Discover Airlines' own pet policy on 2026-10-03.
How many pet carriers fit Discover Airlines' limit?
6 of the 15 carriers we track fit Discover Airlines' 21.7 × 15.7 × 9.1 in limit: 2 with room to spare on every side and 4 only when collapsed or squeezed a little. 9 are too big.
Which carriers only fit Discover Airlines when collapsed or squeezed?
Mr. Peanut's Gold Series Standard (Expandable), Sherpa Original Deluxe (Medium), Sherpa Original Deluxe (Large), SturdiBag Pro (Large, Flexible Height). Each is over the published size until folded or pressed down, so measure yours and expect it may be checked at the gate.
Which carriers are too big for Discover Airlines?
Petmate Soft-Sided Kennel Cab (Medium), Diggs Passenger, ibiyaya JetPaw Expandable Backpack, Sleepypod Atom, Away The Pet Carrier, Petsfit (Medium) Expandable Soft-Sided, Bergan Comfort Carrier (Small), Frisco Premium Airline-Compliant Carrier, Sleepypod Air. Each is over the 21.7 × 15.7 × 9.1 in limit.
How much does Discover Airlines charge for a pet in the cabin?
Subject to a fee that depends on the route (Discover publishes no single figure; its Service Center quotes the price). Confirm the current fee with Discover Airlines when you book.