Allegiant Air in-cabin pet policy — and the carriers that fit
Allegiant Air allows small pets in the cabin in a carrier up to 18 × 12 × 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 $50 per segment, per carrier. 9 of the 15 carriers we track clear that published limit.
The Sherpa Original Deluxe (Small) leaves the most room — 2" on its tightest dimension, while the Diggs Passenger only just squeaks in with nothing to spare. Allegiant's 11" height ceiling sits mid-pack among the 58 airlines we track (shared with American, Delta, Frontier, JSX, United): Avelo and Breeze allow more, while EL AL Israel allows only 7".
Will your carrier fit Allegiant Air?
Measure the outside of your carrier (bulges included) and enter it below. The check uses Allegiant Air’s published 18 × 12 × 11 in limit — height is checked strictly, the footprint may rotate.
Allegiant Air pet rules
| Recommended max carrier (soft) | 18 × 12 × 11 in |
| Max hard-sided kennel | 17 × 11 × 10.5 in |
| Soft-sided required? | Soft recommended; hard allowed within its limit |
| In-cabin fee | $50 per segment, per carrier · compare all airlines → |
| Species allowed | dogs, cats |
| Pets | 1 carrier per traveler (up to 2 pets per carrier); counts as 1 of your 2 carry-on items |
| Booking | Check in with an Allegiant agent at the ticket or gate counter at least 1 hour before departure. Cabin pets allowed within the 48 contiguous US only. |
Source: official Allegiant Air pet policy · verified 2026-07-06
Carriers that fit Allegiant Air
Matched to Allegiant Air's published 18 × 12 × 11 in limit (height checked strictly; footprint may rotate). See the full Allegiant Air 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" 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" 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
Allegiant Air'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 Allegiant Air to confirm under-seat dimensions for that aircraft, or
- Choose a collapsible / flexible-height carrier that adapts to a tighter space.
More airlines: Air Canada · Alaska Airlines · American Airlines · Breeze Airways · Delta Air Lines · Frontier Airlines · Southwest Airlines · United Airlines · Austrian Airlines · all →
Common questions
What size pet carrier does Allegiant Air allow in the cabin?
Allegiant Air's recommended maximum in-cabin carrier is 18 × 12 × 11 in (soft) or 17 × 11 × 10.5 in for a hard-sided kennel. It must fit fully under the seat in front of you. Source: the Allegiant Air pet policy.
How much does Allegiant Air charge for an in-cabin pet?
$50 per segment, per carrier. Always confirm the current fee on the official Allegiant Air pet page before you fly.
Which pet carriers fit Allegiant Air?
9 of the 15 carriers we track clear Allegiant Air's published 18 × 12 × 11 in. The roomiest is the Sherpa Original Deluxe (Small), with 2" to spare on its tightest dimension. Full shortlist: /fits/allegiant/.
Does Allegiant Air require a soft-sided pet carrier?
Allegiant Air recommends soft-sided but allows a hard-sided kennel within its published limit. Height is what rules carriers out: Allegiant Air publishes 11", against 13" at the most generous airline we track.
How many pets can I bring in the cabin on Allegiant Air?
1 carrier per traveler (up to 2 pets per carrier); counts as 1 of your 2 carry-on items. Species accepted: dogs, cats. Check in with an Allegiant agent at the ticket or gate counter at least 1 hour before departure. Cabin pets allowed within the 48 contiguous US only.