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. Below: the official rules (cited), the honest under-seat caveat, and which carriers fit that limit.
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 |
| 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 →
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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.
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