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 $149 per pet, each way (non-refundable). 11 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 Mr. Peanut's Gold Series Standard (Expandable) only just squeaks in with nothing to spare. Frontier's 11" height ceiling sits mid-pack among the 77 airlines we track (shared with Allegiant, American, American Eagle (regional, incl. Republic Airways), Copa, Delta, JSX, United): Air Europa, Avelo, Breeze and Pegasus 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.
Carriers that clear Frontier Airlines (18 × 14 × 11 in)
Roomiest margin first. Sized to the airline’s limit, not to your pet — measure your pet first →
| Carrier | Size | Fit | Buy |
|---|---|---|---|
Sherpa Original Deluxe (Small) up to ~8 lb · max pet 13″ long × 7.5″ tall | 15 × 10 × 8.5 in | Fits 2.5" spare | See on Amazon → |
 Mr. Peanut's Gold Series Mini (Low-Profile) up to ~15 lb | 17 × 11 × 9 in | Fits 1" spare | See on Amazon → |
Petmate Soft-Sided Kennel Cab (Medium) up to ~10 lb | 17 × 10 × 10 in | Fits 1" spare | See on Amazon → |
Affiliate link — we may earn a small commission at no extra cost to you. It never changes our specs or which carriers we list.
Frontier Airlines pet rules
| Max soft-sided carrier | 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 | $149 per pet, each way (non-refundable) · compare all airlines → |
| Species allowed | dogs, cats, rabbits, guinea pigs, hamsters, small household birds |
| Minimum age | At least 8 weeks |
| Pets | 1 pet per passenger in the cabin; only one adult dog or cat per carrier; no pets in cargo |
| Booking | Add "Cabin Pet" in the Passenger Info step when booking, or later via Manage Trip → "Add Pet in Cabin" · what to book, buy and pack → |
| Routes & cargo | Flights within the U.S. only — only service dogs fly on Frontier's international flights. No pets in the cargo hold and no checked pets. |
Source: official Frontier Airlines pet policy · verified 2026-09-04 · how Frontier Airlines ranks on fee and space →
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.
This table ranks by Frontier Airlines’s size limit — not by your pet. The weight under each carrier is what that size is rated to hold. A bag can clear the airline and still be the wrong size for the animal, which is the most common reason one goes back — measure your pet first →
| Carrier | Size | Fit | Buy |
|---|---|---|---|
Sherpa Original Deluxe (Small) up to ~8 lb · max pet 13″ long × 7.5″ tall | 15 × 10 × 8.5 in | Fits 2.5" spare | See on Amazon → |
Mr. Peanut's Gold Series Mini (Low-Profile) up to ~15 lb | 17 × 11 × 9 in | Fits 1" spare | See on Amazon → |
Petmate Soft-Sided Kennel Cab (Medium) up to ~10 lb | 17 × 10 × 10 in | Fits 1" spare | See on Amazon → |
Sherpa Original Deluxe (Medium) up to ~16 lb · max pet 16″ long × 9.5″ tall | 17 × 11 × 10.5 in | Fits 0.5" spare | See on Amazon → |
Diggs Passenger pet size not published · Diggs discontinued this carrier — link goes to similar carriers | 17 × 12 × 10.5 in | Fits 0.5" spare | Search Amazon → |
Sleepypod Atom up to ~12 lb | 17 × 8.5 × 10.5 in | Fits 0.5" spare | See on Amazon → |
Mr. Peanut's Gold Series Standard (Expandable) up to ~20 lb | 18 × 11 × 10 in | Exact fit 0" spare | See on Amazon → |
ibiyaya JetPaw Expandable Backpack up to ~17 lb | 18 × 12 × 10.5 in | Exact fit 0" spare | See on Amazon → |
Petsfit (Medium) Expandable Soft-Sided up to ~13 lb | 17 × 11 × 11 in | Exact fit 0" spare | See on Amazon → |
Bergan Comfort Carrier (Small) pet size not published | 16 × 8 × 11 in | Exact fit 0" spare | See on Amazon → |
Frisco Premium Airline-Compliant Carrier up to ~22 lb | 18 × 11 × 11 in | Exact fit 0" spare | Search Amazon → |
Sleepypod Air up to ~18 lb | 22 × 10.5 × 10.5 in | Fits collapsed | See on Amazon → |
SturdiBag Pro (Large, Flexible Height) pet size not published | 18 × 11.5 × 11.5 in | Flexes — 0.5" over | See on Amazon → |
2 carriers too big for Frontier Airlines
Away The Pet Carrier pets up to ~18 lb | 18.7 × 10.8 × 10.75 in | Too big | Compare similar on Amazon → |
Sherpa Original Deluxe (Large) up to ~22 lb · max pet 18″ long × 10.5″ tall | 19 × 11.75 × 11.5 in | Too big | View on Amazon |
How to confirm your actual under-seat space
Frontier Airlines's number is its published maximum, not a guarantee 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 exit rows — bulkheads have no under-seat storage and most airlines ban pets there — and check this airline's seat rules above.
- 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 · JetBlue · 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?
$149 per pet, each way (non-refundable). Always confirm the current fee on the official Frontier Airlines pet page before you fly.
Which pet carriers fit Frontier Airlines?
11 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. The heaviest pet any carrier that clears Frontier Airlines is rated for is 22 lb (some fitting carriers publish no pet rating). 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 pet per passenger in the cabin; only one adult dog or cat per carrier; no pets in cargo. Species accepted: dogs, cats, rabbits, guinea pigs, hamsters, small household birds. Add "Cabin Pet" in the Passenger Info step when booking, or later via Manage Trip → "Add Pet in Cabin"