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Allegiant Air Pet Policy – Complete Guide for In-Cabin Pet Travel

By flightshelpcenter

Published on December 11, 2025

Flying with a pet on Allegiant Air is possible, but the airline follows one of the strictest and most limited Allegiant Pet Policy among U.S. carriers. Allegiant allows only small dogs and cats and accepts them in the cabin on domestic routes only—there is no cargo option, no international acceptance, and no exceptions for larger animals. Because the policy is short and firm, travelers must understand the details clearly before booking to avoid last-minute denials at the airport.

If you need help confirming whether your pet qualifies or whether your flight accepts pets, many travelers use +1 (866) 558-3017 for assistance.

Quick Overview: Allegiant Air Pet Policy

Allegiant allows small dogs and cats in the cabin on domestic flights only. Pets must travel in a soft-sided under-seat carrier (max: 9”H × 16”W × 19”L), and passengers must pay a $50 per segment pet fee at check-in. Allegiant does not offer cargo pet transport and does not allow pets on international routes.

Key Rules at a Glance:

Dogs & cats only — no birds, rabbits, reptiles, or exotics
Domestic U.S. flights only (no Mexico or Caribbean)
Under-seat soft carrier required
Carrier size limit: 9 × 16 × 19 inches
Pet must remain inside the closed carrier at all times
Maximum one carrier per passenger
Fee: $50 per segment, non-refundable
Pets count as a carry-on item
Airport counter check-in required

If you are unsure about aircraft spacing or carrier fit, it’s smart to confirm with support at +1 (866) 558-3017 before traveling.

Which Pets Allegiant Allows in the Cabin (and Why the List Is Limited)

Allegiant allows only small dogs and cats in the cabin to maintain safety and control space. The airline does not accept any other animals. Pets must stay inside an approved under-seat carrier for the entire flight, and travelers should book pet space early to avoid issues.

Allegiant keeps its list of approved pets extremely narrow to simplify compliance and ensure cabin safety. Only:

Pet Type	Allowed?	Notes
Small dogs	Yes	Must fit in approved soft-sided carrier
Small cats	Yes	Must meet age & carrier requirements

qualify for in-cabin travel. No other species are accepted—not even commonly allowed small pets like rabbits or household birds.

Why so limited?

Because Allegiant operates a low-cost, simplified fleet structure and does not offer cargo operations. Allowing only dogs and cats minimizes complications with ventilation, passenger allergies, and aircraft design.

Pet Requirements:

At least 8 weeks old
Healthy and non-disruptive
Clean, quiet, and free of strong odors
Able to stand & turn comfortably inside the carrier

This narrow eligibility ensures Allegiant can maintain consistent rules across all flights.

How Strict Is Allegiant With Pet Rules?

Allegiant is considered very strict with in-cabin pet standards. Under the Allegiant Pet Policy, the airline follows a single rule set across its entire fleet, leaving no flexibility if the carrier is too tall, too rigid, or if the pet cannot remain fully contained during the flight.

Allegiant enforces strictness in four key areas:

Carrier Size & Fit (Most Enforced Rule)

Agents measure or visually assess carriers during check-in. The carrier must:

Not exceed 9″ (H)
Slide fully under the seat
Be soft-sided
Provide enough space for natural movement

If the bag looks even slightly too tall or stiff, Allegiant may deny your pet.

Route Restrictions

Pets are permitted only on domestic flights within the U.S. They are banned from:

Mexico routes
Caribbean destinations
Any international airport

Containment & Behavior

Your pet must remain:

Fully inside the closed carrier
Under the seat in front of you
Quiet and non-disruptive

Allegiant does not tolerate laps, open zippers, or restless pets during flight.

Capacity & Check-In Rules

Because each aircraft has limited space, Allegiant may restrict how many pets can board a single flight. As part of the Allegiant Pet Policy, travelers must check in at the counter so agents can confirm the carrier meets rules and collect the applicable fee.

If you want accurate confirmation for your specific flight, support is available at +1 (866) 558-3017.

Allegiant Pet Carrier Requirements (2025)

Allegiant allows only soft-sided carriers with maximum dimensions:

9″ H × 16″ W × 19″ L

The pet must be able to stand, turn, and lie down without compressing the walls. The carrier must:

Have a leak-proof bottom
Offer proper ventilation
Fit completely under the seat
Close securely
Count as your carry-on bag

Because Allegiant uses A319/A320 aircraft only, the sizing remains consistent across nearly all flights.

Allegiant Pet Fees (2025): What Travelers Often Miss

Allegiant charges a $50 fee per segment for in-cabin pets. This means you pay the fee for each flight leg, not per travel day.

Fee Breakdown:

$50 per segment
Paid at airport check-in
One fee per carrier
Non-refundable

Many travelers misunderstand the “per segment” rule. If your itinerary includes a stop, you will pay twice for one direction.

If you want a fee explanation for your route, you can call +1 (866) 558-3017.

How to Add a Pet to an Allegiant Flight (2025)

Allegiant does not allow online pet booking. You must add your pet by calling Allegiant directly.

Steps to book your pet:

Confirm your flight is domestic-only
Call Allegiant to reserve the pet space
Bring a compliant under-seat carrier
Pay the pet fee at the airport
Keep your pet inside the carrier throughout the journey

If you aren’t sure whether your flight allows pets, you can get help at +1 (866) 558-3017.

Does Allegiant Allow Pets in Cargo?

No. Allegiant does not offer cargo or checked-baggage pet service.
If your pet doesn’t fit under the seat, Allegiant cannot transport them on any route.

Conclusion

Allegiant pet policy is simple but strict: small dogs and cats only, in the cabin, on domestic routes, in a soft-sided under-seat carrier. Once you understand the limitations and book early, traveling with a pet on Allegiant is straightforward.

If you want help confirming eligibility, carrier sizing, or segment fees, support is available at +1 (866) 558-3017.

Frequently Asked Questions

What pets does Allegiant allow in the cabin?

Allegiant allows only small dogs and cats in the cabin. Birds, rabbits, reptiles, rodents, and exotic animals are not permitted. Pets must be at least eight weeks old, healthy, quiet, and remain inside an approved carrier throughout the flight. Since Allegiant does not offer cargo pet transport, pets that do not meet in-cabin requirements cannot travel with the airline.

How strict is Allegiant with pet carriers?

Allegiant is strict because its aircraft have fixed under-seat dimensions. Carriers must not exceed 9″ H × 16″ W × 19″ L, must fit fully under the seat, and must be soft-sided and leak-resistant. Pets must be able to stand, lie down, and turn around comfortably. If a carrier or pet does not meet these standards, Allegiant may deny boarding.

What is the pet fee on Allegiant, and how does it work?

Allegiant charges $50 per segment for in-cabin pets. A round-trip nonstop costs $100, while one-way trips with a connection also total $100. Fees are paid at airport check-in after verification and are always non-refundable. Because Allegiant does not offer online pet booking, knowing your number of flight segments is essential.

Does Allegiant allow pets on international flights?

No. Allegiant only accepts pets on domestic U.S. flights. Pets cannot travel to or from international destinations served by the airline, including Mexico and the Caribbean. If your trip includes any international segment, pets will not be allowed to fly.

Can two pets share one carrier on Allegiant?

Yes. Allegiant allows up to two small pets in one carrier as long as they fit comfortably, are calm, and can stand and turn naturally. The airline charges one pet fee per carrier. If the pets appear stressed or crowded, Allegiant may require separate carriers, which increases total cost.

Does Allegiant require a pet health certificate?

Allegiant does not require a health certificate for most domestic flights. However, pets must appear healthy, odor-free, and non-aggressive. Some states may require vaccination records, so carrying basic documentation is recommended in case of inspections.

How do I add a pet to my Allegiant reservation?

Pets cannot be added online. You must call Allegiant to reserve space because availability is limited. Agents verify aircraft eligibility, carrier compliance, and remaining pet slots. Fees are paid at airport check-in. Many travelers call +1 (866) 558-3017 for help confirming requirements.

Does Allegiant allow pets in cargo?

No. Allegiant does not offer checked or cargo pet transport. Only small pets in soft-sided under-seat carriers are accepted. Larger pets or those needing cargo accommodations must travel on another airline.

What happens if my pet is disruptive during travel?

Pets must remain quiet, calm, and fully enclosed in the carrier at all times. Excessive barking, attempts to escape, or disruptive behavior may result in denied boarding. Allegiant recommends acclimating pets to the carrier before travel to avoid issues.

Does the pet carrier replace my carry-on bag?

Yes. The pet carrier counts as your carry-on bag. Passengers may still bring one personal item, but no additional carry-on bags are allowed. Plan your luggage carefully to avoid extra fees at the gate.