Frontier Airlines in-cabin pet policy — and the carriers that fit
Frontier Airlines allows small pets in the cabin in a carrier up to 18 × 14 × 11 in, stowed under the seat in front of you. Already own a carrier? Enter its measurements below to check it against this limit. The in-cabin fee is $99 each way. 9 of the 15 carriers we track clear that published limit.
The Sherpa Original Deluxe (Small) leaves the most room — 2.5" on its tightest dimension, while the Petsfit Expandable Soft-Sided only just squeaks in with nothing to spare. Frontier's 11" height ceiling sits mid-pack among the 58 airlines we track (shared with Allegiant, American, Delta, JSX, United): Avelo and Breeze allow more, while EL AL Israel allows only 7".
Will your carrier fit Frontier Airlines?
Measure the outside of your carrier (bulges included) and enter it below. The check uses Frontier Airlines’s published 18 × 14 × 11 in limit — height is checked strictly, the footprint may rotate.
Frontier Airlines pet rules
| Recommended max carrier (soft) | 18 × 14 × 11 in |
| Max hard-sided kennel | 18 × 14 × 8 in |
| Soft-sided required? | Soft recommended; hard allowed within its limit |
| In-cabin fee | $99 each way · compare all airlines → |
| Species allowed | dogs, cats, rabbits, guinea pigs, hamsters, small household birds |
| Weight | Combined pet + carrier under 17 lb |
| Pets | 1 carrier per passenger; pet stays in cabin (no cargo) |
| Booking | Add at flyfrontier.com when booking |
Source: official Frontier Airlines pet policy · verified 2026-07-23
Carriers that fit Frontier Airlines
Matched to Frontier Airlines's published 18 × 14 × 11 in limit (height checked strictly; footprint may rotate). See the full Frontier Airlines carrier shortlist →
Affiliate link — we may earn a small commission at no extra cost to you. It never changes our specs or which carriers we list.
| Carrier | Size | Fit | Buy |
|---|---|---|---|
| 15 × 10 × 8.5 in | Fits 2.5" spare | See on Amazon → | |
| 16 × 10.5 × 9.8 in | Fits 1.2" spare | See on Amazon → | |
| 17 × 10 × 10 in | Fits 1" spare | See on Amazon → | |
| 17 × 11 × 10.5 in | Fits 0.5" spare | See on Amazon → | |
| 17 × 12 × 10.5 in | Fits 0.5" spare | See on Amazon → | |
| 17 × 8.5 × 10.5 in | Fits 0.5" spare | See on Amazon → | |
| 17 × 11 × 11 in | Fits 0" spare | See on Amazon → | |
| 16 × 8 × 11 in | Fits 0" spare | See on Amazon → | |
| 18 × 11 × 11 in | Fits 0" spare | See on Amazon → | |
| 22 × 10.5 × 10.5 in | Fits collapsed | See on Amazon → | |
| 18 × 11.5 × 11.5 in | Flexes — check height | See on Amazon → | |
| 18 × 12 × 12 in | Too tall (12" > 11") | See on Amazon → | |
| 18.7 × 10.8 × 10.75 in | Too big | See on Amazon → | |
| 19 × 11.75 × 11.5 in | Too big | See on Amazon → | |
| 18.5 × 11.75 × 11.5 in | Too big | See on Amazon → |
How to confirm your actual under-seat space
Frontier 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 Frontier Airlines to confirm under-seat dimensions for that aircraft, or
- Choose a collapsible / flexible-height carrier that adapts to a tighter space.
By animal
Frontier Airlines publishes a specific term for these — each has its own conditions:
rabbits, guinea pigs and hamsters small household birds
More airlines: Air Canada · Alaska Airlines · Allegiant Air · American Airlines · Breeze Airways · Delta Air Lines · Southwest Airlines · United Airlines · JSX · all →
Common questions
What size pet carrier does Frontier Airlines allow in the cabin?
Frontier Airlines's recommended maximum in-cabin carrier is 18 × 14 × 11 in (soft) or 18 × 14 × 8 in for a hard-sided kennel. It must fit fully under the seat in front of you. Source: the Frontier Airlines pet policy.
How much does Frontier Airlines charge for an in-cabin pet?
$99 each way. Always confirm the current fee on the official Frontier Airlines pet page before you fly.
Which pet carriers fit Frontier Airlines?
9 of the 15 carriers we track clear Frontier Airlines's published 18 × 14 × 11 in. The roomiest is the Sherpa Original Deluxe (Small), with 2.5" to spare on its tightest dimension. Full shortlist: /fits/frontier/.
Does Frontier Airlines require a soft-sided pet carrier?
Frontier Airlines recommends soft-sided but allows a hard-sided kennel within its published limit. Height is what rules carriers out: Frontier Airlines publishes 11", against 13" at the most generous airline we track.
How many pets can I bring in the cabin on Frontier Airlines?
1 carrier per passenger; pet stays in cabin (no cargo). Species accepted: dogs, cats, rabbits, guinea pigs, hamsters, small household birds. Weight limit: Combined pet + carrier under 17 lb. Add at flyfrontier.com when booking