Flying with Pets on Allegiant in 2025: Your Complete Guide

Bringing a cat or small dog along on your Allegiant flight is simpler than you might think, but the airline’s pet policy is precise. Space is limited, fees apply per flight segment, and the carrier must fit under a standard seat. If you understand the rules before you book, you can avoid gate‑side surprises and give your animal a much calmer experience. This guide covers everything Allegiant allows in 2025—from approved carrier dimensions and booking procedures to service animal distinctions, health precautions, and airport preparation. We also answer the most common questions travelers ask before buying a ticket.

Allegiant Pet Travel: What’s Allowed and Where

Allegiant accepts small domestic cats and dogs only in the cabin. The airline does not transport pets as checked baggage or cargo, and no other species are permitted. Your animal must stay inside an approved carrier stowed under the seat in front of you for the entire flight.

Pet‑friendly routes are limited to flights within the contiguous 48 United States and service to San Juan, Puerto Rico. International destinations and Hawaii are not included in the standard pet program, primarily because of quarantine requirements and flight length. Always check your exact route when booking, as Allegiant may adjust seasonal service to San Juan.

Eligibility for You and Your Pet

  • Passenger age: You must be at least 15 years old to travel with a pet carrier.
  • Pet age and health: Puppies and kittens must be at least 8 weeks old and appear healthy. Allegiant staff may refuse an animal that seems ill, extremely anxious, or aggressive.
  • Vaccinations: While a health certificate is not required for domestic flights, Allegiant strongly recommends that your pet is current on core vaccines. Carry a copy of the vaccination record. Some destination states may demand additional documentation; review the USDA pet travel site for entry requirements.
  • Pets per carrier: A maximum of two pets of the same species can share one carrier if both can stand, turn around, and lie down comfortably. Only one carrier per passenger is allowed.

Allegiant‑Approved Pet Carrier: Dimensions, Materials, and Features

The carrier is the number one reason pets are turned away at the gate. Allegiant enforces a strict size limit because the carrier must slide completely under the seat. The maximum external dimensions are 9 inches high x 16 inches wide x 19 inches long (22.8 cm x 40.6 cm x 48.3 cm). Both soft‑sided and hard‑sided models are permitted, but a soft‑sided carrier is often easier to fit because it can compress slightly without harming the animal.

Key carrier requirements:

  • Leak‑proof and well‑ventilated on at least two sides.
  • Secure zippers or latches that prevent escape. A small padlock is allowed if it can be opened quickly by crew during an inspection.
  • Enough interior room for the pet to stand up without its ears touching the top, turn around, and lie down in a natural position.
  • The carrier counts as your personal item or carry‑on depending on your fare bundle. You can still bring a small personal bag that fits under the same seat, but Allegiant’s standard carry‑on fee may apply for larger bags.

Before buying a carrier, measure your pet’s height (floor to top of head while standing) and length (nose to base of tail). Compare these numbers to the carrier’s interior dimensions, not just the exterior. Many popular airline‑compliant carriers are designed around the 9x16x19 specification; you can browse options from reliable retailers like Amazon’s airline‑approved pet carrier section and read reviews that specifically mention under‑seat fit on Allegiant aircraft.

Booking Your Pet’s Flight: Fees, Limits, and Reservations

Space for pets in the cabin is strictly limited. Most Allegiant flights accept no more than four or five pet carriers, depending on the aircraft type. You cannot simply show up at the airport and expect to bring your pet onboard. You must add your pet to the reservation in advance by calling Allegiant customer service at 702‑505‑8888. Pet slots often sell out days or even weeks ahead during holidays and peak travel periods, so call as soon as your travel dates are firm.

The pet fee is $50 to $100 per segment, per carrier. A round trip with a connection in a focus city will include a separate charge for each flight leg. This fee is non‑refundable and is charged in addition to any passenger baggage or seat fees. If you cancel your trip, the pet fee is generally not refunded, but you may be able to transfer it to a new pet reservation on the same itinerary—subject to availability and Allegiant’s discretion. Always confirm the exact fee when you call, because station‑level pricing can vary slightly.

On travel day, arrive at the airport at least 45 minutes before departure. An agent needs time to inspect your carrier and finalize acceptance. A late arrival could result in your pet being denied boarding even if you hold a reservation.

Day of Travel: Check‑In, Boarding, and In‑Flight Rules

At the check‑in counter, an Allegiant agent will visually examine the carrier and ask to briefly remove your pet to verify the carrier’s interior condition. Afterward, the animal must remain inside the carrier, zipped and latched, until the aircraft door opens at your destination.

During boarding, place the carrier under the seat in front of you as soon as you reach your row. The carrier must stay there for taxi, takeoff, turbulence, and landing. You may not place the carrier on your lap, in an overhead bin, or in the aisle. Window seats often provide slightly more legroom and a better fit for the carrier; if you have an aisle or middle seat, double‑check the underseat space before stowing.

Allegiant does not provide in‑flight pet relief areas. Your pet must hold its bladder for the entire flight plus boarding and deplaning time. A carefully timed potty break at a terminal pet relief station just before boarding is essential. Many airports now offer indoor relief rooms with artificial grass, drains, and waste bags. Check your departure airport’s terminal map online or visit the TSA’s pet travel page to locate these facilities. Plan to arrive at the airport early enough to use them before security and again near the gate if possible.

Service Animals and Emotional Support Animals: The 2025 Distinction

After the U.S. Department of Transportation updated its regulations in early 2021, Allegiant aligns with the federal framework. Emotional support animals (ESAs) are no longer recognized as service animals and must travel under the standard pet policy. That means your ESA must remain in an approved carrier under the seat and you must pay the applicable pet fee. If your ESA is too large for a carrier that fits under the seat, it cannot travel in the cabin as an ESA.

Allegiant welcomes trained service dogs at no charge, and they are allowed to occupy the cabin floor space without a carrier. A service dog is defined as a dog that is individually trained to do work or perform tasks for the benefit of a qualified individual with a disability. No other species are accepted as service animals.

To fly with a service dog, you must complete and submit the DOT’s Service Animal Air Transportation Form at least 48 hours before your flight. If you book within 48 hours, you may present the form at the departure gate. For flights longer than 8 hours, you may also need to submit a Service Animal Relief Attestation. You can find the official forms and guidance on the U.S. DOT service animal page.

Service dogs must be harnessed, leashed, or otherwise tethered at all times and must fit within your foot space without blocking the aisle. Allegiant may deny transport if the dog shows aggressive behavior, poses a direct threat to others, or causes a significant disruption.

Health, Breed, and Temperature Considerations

Allegiant does not publish a banned‑breed list, but owners of brachycephalic (short‑nosed) breeds should be especially cautious. Dogs like pugs, bulldogs, and Boston terriers, and cats such as Persians and Himalayans, have compressed airways that make them more vulnerable to breathing difficulties and heat stress, even in a climate‑controlled cabin. Before booking, consult your veterinarian for an honest fitness‑to‑fly assessment.

Extreme weather at origin or destination airports can also affect pet acceptance. Allegiant may embargo pet travel when ground temperatures exceed safety thresholds—often above 85°F or below 20°F—because animals could be exposed to harsh conditions during boarding or deplaning on the ramp. If you are traveling during a heat wave or a cold snap, call ahead to confirm whether an embargo is in place.

If your pet has a chronic condition, carry a short medical summary from your vet, along with any necessary medications, in your carry‑on. Do not tranquilize your pet for the flight unless your veterinarian specifically prescribes it, because altitude can alter how sedatives work and may cause respiratory depression.

Pre‑Flight Preparation: Training and Packing for a Smooth Flight

A calm pet starts with preparation at home. Introduce the carrier weeks in advance by leaving it open in a common area with a soft blanket and a few treats. Feed your pet near the carrier, then inside it, to build positive associations. Once your pet comfortably naps inside, take short car trips while crated to simulate motion.

On travel day, follow this timeline:

  • 3–4 hours before departure: Offer a light meal. A full stomach increases the chance of motion sickness.
  • 1 hour before: Provide water, then limit fluids until just before you place the pet in the carrier.
  • Just before boarding: Offer an ice cube or a small lick of water, then use a pheromone calming spray (such as Feliway for cats or Adaptil for dogs) inside the carrier a few minutes before loading your pet.

Pack a travel kit that includes a collapsible water bowl, a zip‑close bag of kibble, waste bags, and a familiar blanket or shirt that smells like home. Attach a secure, non‑snag collar with a current ID tag that shows your cell phone number. Consider a secondary tag with a backup contact in case you cannot be reached.

During boarding, speak in a soft, reassuring voice and avoid pulling the carrier out once it is stowed. If your pet whines or scratches, resist the urge to open the carrier; quiet reassurance from above works better for most animals. The steady hum of the aircraft at cruising altitude often helps them settle.

Destinations and Route‑Specific Tips

Allegiant’s network focuses on leisure destinations such as Las Vegas, Orlando‑Sanford, Phoenix‑Mesa, Punta Gorda, and Myrtle Beach. Many of these airports are smaller, which can mean shorter taxi times and a less stressful environment for pets. However, some smaller airports lack indoor pet relief areas, so you may need to use outdoor grassy spots before going through security. Check the airport’s website or the TSA page ahead of time to plan your pet’s bathroom break.

Allegiant operates mostly point‑to‑point flights and does not offer traditional connections. This eliminates the stress of a layover transfer for your pet, but if you build your own itinerary with two separate Allegiant segments as a self‑connect, you will need to exit security, collect your pet, re‑check through security, and re‑book the pet for the second flight—with all the time and fee implications that brings. Self‑connecting is rarely worth the hassle when traveling with an animal.

Troubleshooting and Contingency Planning

Even the most prepared traveler can encounter hiccups. If your pet becomes ill or escapes the carrier mid‑flight, alert a flight attendant immediately. They can assist with minor issues and coordinate with ground personnel if veterinary care is needed upon landing. Never open the carrier in the aisle or near an exit row; containment is the priority.

If Allegiant denies your pet at check‑in because of an ill‑fitting carrier, missing documentation, or perceived health issues, ask to speak with a supervisor about rebooking options. While the pet fee is non‑refundable, the airline may allow you to apply it to a later flight if space is available. Always have a backup plan: a friend or family member who can pick up your pet from the airport, or the number of a nearby boarding facility, just in case.

Frequently Asked Questions About Allegiant Pet Travel

Can I bring more than one pet carrier on Allegiant?

No. Each passenger may bring only one carrier. If you are traveling alone with two pets that cannot share the same carrier, you will need a second ticketed passenger to accommodate the second carrier, or you must find alternative transport for one animal.

What if my pet carrier is slightly larger than the Allegiant dimensions?

If the carrier exceeds 9x16x19 inches in any direction, it will not be accepted. Gate agents use rigid sizing boxes, and even a soft‑sided carrier that appears compressible is still measured against the stated limits. Do not risk it—purchase or borrow a carrier that genuinely fits.

Does Allegiant allow pets on flights to Hawaii or international destinations?

No. The standard pet policy covers only the contiguous 48 states and San Juan, Puerto Rico. Hawaii’s quarantine requirements and international regulations are not supported by Allegiant’s pet program.

How can I keep my pet quiet and calm during the flight?

Start with carrier acclimation at home and consider a light‑blocking carrier cover that leaves ventilation open to create a den‑like atmosphere. Pheromone sprays, a favorite chew toy, or a frozen lick mat with a tiny amount of xylitol‑free peanut butter can help. Do not use bark collars or sedatives unless prescribed by your veterinarian specifically for air travel.

Are there any breed‑specific bans on Allegiant?

Allegiant does not ban specific breeds. However, the airline reserves the right to deny boarding to any animal that behaves aggressively, appears ill, or shows extreme fear. Short‑nosed breeds face higher physiological risks, so a veterinary consultation is strongly advised.

What documentation does Allegiant require for a service dog?

You must complete the DOT Service Animal Air Transportation Form at least 48 hours before your flight. For flights longer than 8 hours, a relief attestation may also be required. No other paperwork is mandatory, though keeping a letter from your healthcare provider that describes the task the dog performs can be helpful.

Is the pet fee refundable if I cancel my flight?

No. The pet fee is generally non‑refundable. In some cases, Allegiant may allow you to transfer the fee to a new pet reservation on the same itinerary, but this is subject to availability and not guaranteed.

Final Thoughts and Resources

Allegiant’s pet policy is built around safety and practicality. When you choose an approved carrier, book early, and put time into pre‑flight training, you can turn travel day into a manageable—and even pleasant—experience for both of you. Every step from check‑in to touchdown becomes easier when you know exactly what to expect.

Before you travel, always confirm the latest policy details on Allegiant’s official pet policy page or by calling reservations. Review the TSA pet travel guidelines for security screening procedures, and check the USDA pet travel site for any state‑specific entry requirements. A well‑prepared pet parent makes all the difference, and with the right information, your 2025 flight with Allegiant can take off without a hitch.