Frontier Pet Policy (2026): Fees, Carrier Size, Allowed Animals and What to Know Before You Fly

Frontier pet travel means flying a small animal in the cabin of a Frontier Airlines flight under the airline's in-cabin pet policy. As of September 2026, Frontier accepts domesticated dogs, cats, rabbits, guinea pigs, hamsters and small household birds on U.S. domestic flights for $149 per pet, per direction, non-refundable. The pet must stay in a carrier under the seat in front of you (maximum 18 x 14 x 11 inches soft-sided). Frontier does not carry pets in cargo or on international flights.

This guide summarizes Frontier's official pet pages as they read on September 29, 2026, explains the federal rules that sit behind them, and lists the practical steps that keep a booking from going wrong at the gate. Airline fees and rules change often, so confirm details on Frontier's own site before you pay.

What is the Frontier Airlines pet policy?

The Frontier Airlines pet policy is the set of conditions under which the ultra-low-cost U.S. carrier accepts companion animals on board. According to Frontier's Family & Pets page (2026), "Pets are allowed in the cabin on all domestic Frontier flights," and the airline states plainly that "we do not allow pets to be checked as baggage." Frontier's help center (2026) adds that "we do not transport pets in the cargo hold."

In practice, that makes Frontier a cabin-only airline for pets. If your animal cannot fit in an under-seat carrier, Frontier is not an option, and you will need to compare other carriers or ground transport.

How much does it cost to bring a pet on Frontier?

Frontier's Optional Services fee schedule (2026) lists the Pet Charge at $149 per pet, per direction (Non-Refundable). A round trip with one pet therefore costs $298 in pet fees alone.

• Per direction, not per segment: Frontier prices the pet charge per direction. Its fee table lists some other charges per flight segment, so the wording matters if your trip includes a connection.
• Pay early or at check-in: Frontier's Family & Pets page (2026) says the one-way charge "may be paid in advance during booking. If you do not pay in advance, you'll need to pay when you check-in your pet."
• Bags are separate: The pet carrier does not replace your bag allowance. Frontier (2026) allows either a personal item or a paid carry-on in addition to the pet container.
• Other Frontier charges still apply: Seat selection, carry-on bags and agent-assistance charges are billed on their own under the same 2026 fee schedule.

CabinPets, an independent fee tracker, also listed Frontier at $149 each way in its 2026 comparison, just under the $150 each way it recorded for American Airlines, Delta Air Lines, United Airlines and JetBlue. The airline's own fee page remains the authority. If a travel blog quotes a lower Frontier figure, it is probably out of date.

Which animals can fly on Frontier?

Frontier's Family & Pets page (2026) lists the accepted species as "domesticated dogs, cats, rabbits, guinea pigs, hamsters, or small household birds" on flights within the United States. Dogs and cats must be at least 8 weeks old.

Animals Frontier never accepts

The same page states that the following "are never accepted":

• Large birds, such as parrots, macaws, cockatoos and birds of prey
• Rodents, including mice, rats and squirrels (hamsters and guinea pigs are the listed exceptions)
• Beavers and ferrets
• Reptiles, including snakes
• Amphibians, spiders and insects

Frontier's list is narrower than the federal definition of a pet. The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) counts ferrets and some birds as pets for travel-document purposes, yet Frontier bans ferrets entirely. For boarding, the airline's own list is what counts.

Frontier pet carrier size requirements

Carrier size is where most Frontier pet bookings fail. Frontier's help center (2026) sets these limits:

Two details are easy to miss. First, the published dimensions are an outer limit, not a guarantee: if your pet cannot stand and turn around inside a carrier that meets them, the pet does not meet the rule. Second, a hard-sided carrier gets 3 inches less height than a soft one, which is why Frontier recommends soft-sided bags that can flex under the seat.

For comparison, CabinPets (2026) lists the maximum carrier size for American Airlines, Delta Air Lines and United Airlines as 18 x 11 x 11 inches. Frontier's soft-sided limit is 3 inches wider, so a carrier sized for Frontier may be too big for another airline, which matters if you have a connecting or return flight on a different carrier.

Frontier's personal item allowance happens to use the same 18 x 14 x 8 inch outer dimensions as the hard-sided carrier limit. The two Frontier pages list the measurements in a different order, but the numbers match.

Seat and cabin rules when flying with a pet

Frontier's Family & Pets page (2026) sets several onboard rules:

• You may not sit in row one or in an exit row when traveling with a pet.
• Some seats cannot fit a pet carrier; Frontier says it will work with you to find a seat that does.
• Your pet must stay in its carrier at all times, including if it becomes restless.
• Frontier asks passengers not to give pets food or water on the aircraft, and recommends no food or water within four hours of departure.
• Frontier states that no oxygen will be given to a pet in an emergency.
• The pet must be "harmless, not disruptive, odorless, and require no attention during flight."

On sedation, Frontier notes that "most veterinarians advise against sedating pets for travel" because the effects of tranquilizers at altitude are unpredictable. That is Frontier's summary of veterinary guidance, not a diagnosis. Ask your own veterinarian about your animal.

How to add a pet to a Frontier booking

Frontier's help center (2026) describes two ways to add a pet:

1. Check eligibility first. Confirm the route is domestic, the species is on Frontier's accepted list, and a dog or cat is at least 8 weeks old.
2. Measure the carrier. Stay within 18 x 14 x 11 inches (soft) or 18 x 14 x 8 inches (hard), and make sure the animal can stand and turn around inside.
3. Add the pet while booking. Select Cabin Pet in the Passenger Info section.
4. Or add it later. Open Manage Trip and select Add Pet in Cabin.
5. Pay the $149 charge. Pay per pet, per direction, either online or when you check in.
6. Pick a suitable seat. Avoid row one and exit rows.
7. Check destination rules. Look up your arrival state's or territory's animal-entry requirements and carry any health certificate it asks for.

Do you need a health certificate to fly Frontier with a pet?

For domestic trips, Frontier's Family & Pets page (2026) says: "While we do not require a health certificate for pets carried in the cabin traveling within the U.S., upon arrival, a certificate may be required by the specific state in which you are landing." Frontier also says it is the passenger's responsibility to check the laws and rules of the destination.

USDA APHIS (page last modified March 20, 2026) is the federal agency for pet travel paperwork. It advises owners taking pets out of the United States to contact a USDA-accredited veterinarian "as soon as you decide to travel."

Puerto Rico and the U.S. Virgin Islands

Frontier (2026) lists extra requirements for U.S. territories. For Puerto Rico, the airline says every animal needs an official health certificate valid for 30 days, rabies vaccination within six months for pets over four months old, treatment for external parasites within 72 hours before entry, and official identification by microchip or a collar with a metal ID tag. For the U.S. Virgin Islands, Frontier lists a health certificate and rabies vaccination within six months, except for dogs and cats under 12 weeks old.

Can you fly internationally with a pet on Frontier?

No. Frontier's Family & Pets page (2026) states that "Frontier Airlines will not accept new pets for International Travel" and that it will accept only service animals internationally. According to Frontier (2026), international service dogs need a CDC Dog Import Form receipt, must be at least 4 months old, must appear healthy on arrival, and need a microchip that a universal scanner can detect.

The U.S. Centers for Disease Control and Prevention (CDC) sets the entry rules for dogs arriving in the United States. According to the CDC (2024), the requirements depend on where the dog was vaccinated and which countries it visited in the previous six months. A dog that has been in a high-risk country for dog rabies and is not vaccinated will not be allowed in.

Service dogs and emotional support animals on Frontier

The U.S. Department of Transportation (DOT) final rule "Traveling by Air With Service Animals" took effect January 11, 2021. It defines a service animal as a dog, of any breed, "individually trained to do work or perform tasks" for a person with a disability. The same rule (DOT, 2020) lets airlines treat emotional support animals as pets.

For Frontier passengers, that means an emotional support animal is subject to the regular pet rules: the carrier size limit, the accepted-species list and the $149 charge. A trained service dog is handled under the service-animal rules. Frontier's help center (2026) also says a passenger traveling with a trained service dog may bring one pet in the cabin as well, if both sets of requirements are met.

Frontier pet travel vs. other kinds of animal documents

People searching "frontier pet" often run into terms like pet passport, health certificate and animal ID, which are easy to confuse. They are different things:

Where Animal Passport fits, and where it does not

Animal Passport is a digital animal and livestock passport that identifies an animal by its muzzle print. The nose print is unique to each animal, much like a fingerprint. An owner captures it with a phone, and the record links the owner, breed, estimated age, body condition and vaccination history. The age estimate comes from a dental photograph and includes a confidence score. The body condition score, on a 1–5 scale, comes from a side-profile photo.

Here is the distinction that matters for this topic: Animal Passport is not an airline pet ticket, a health certificate or a government-issued travel document, and Frontier does not ask for it. The product was built for livestock identity. In August 2025 it was used during livestock flood rescue in Pakistan so farmers could reclaim animals after floodwater washed away their paper tags. For Frontier, follow the airline's rules and your destination's official requirements. For more about biometric livestock ID, see the Animal Passport blog.

Practical tips from reading the fine print

• Pay the pet charge at booking. Frontier lets you pay later at check-in, but paying at booking means the pet is already on your reservation.
• Budget both directions. At $149 each way, one pet adds $298 to a round trip, plus any bag fees.
• Test the carrier at home. Let your pet get used to it for several days, and check it against the 18 x 14 x 11 inch soft-sided limit with a tape measure.
• Keep screenshots. Save the fee page and pet policy on the day you book, since Frontier's fee schedule shows prices that change by booking date.
• Check your arrival state or territory. Frontier leaves destination compliance to the passenger.

Last updated September 29, 2026, by Animal Passport. This article summarizes published airline and government sources and is not legal or veterinary advice.