Pet Policy Frontier Airlines (October 2026): Fees, Carrier Size, Service Dogs and What Paperwork You Need

Frontier Airlines' pet policy lets each passenger bring one small domesticated dog, cat, rabbit, guinea pig, hamster or small household bird in the cabin on flights within the United States for $149 per pet, per direction (non-refundable), according to Frontier's Optional Services page as of October 2026. The pet must stay in a carrier that fits under the seat in front of you: 18 x 14 x 11 inches soft-sided or 18 x 14 x 8 inches hard-sided. Frontier does not fly pets in cargo or on international routes.

The pet policy at Frontier Airlines is the set of rules in Frontier's website and Contract of Carriage that decide which animals may board, in what container, where they sit, and what the owner pays. This guide is written by the Animal Passport editorial team and was last updated on October 8, 2026, using Frontier's own pages and U.S. federal sources. Fees and rules at ultra-low-cost carriers change often, so confirm on Frontier's site before you pay.

Frontier Airlines pet policy at a glance (October 2026)

How much does Frontier charge to fly with a pet?

Frontier charges $149 per pet, per direction, and the charge is non-refundable, according to the Frontier Optional Services fee schedule checked in October 2026. A round trip with one pet therefore costs $298 in pet charges alone, before fares and bag fees.

Frontier's Family and Pets page (2026) says the one-way charge may be paid during booking; if you do not prepay, you pay when you check in your pet. Frontier's FAQ (2026) says you add a pet by selecting Cabin Pet in the Passenger Info section while booking, or later through Manage Trip by selecting Add Pet in Cabin.

Sources disagree on the fee: trust Frontier's page

Some third-party pet travel guides still list a $99 fee and say pets can be booked only by phone. Frontier's own Optional Services page and FAQ, both opened for this article in October 2026, show $149 and online booking. When a blog and the airline disagree, the airline's published fee schedule and Contract of Carriage control.

Which animals can fly on Frontier?

Frontier accepts domesticated dogs, cats, rabbits, guinea pigs, hamsters and small household birds on domestic flights, according to section 14 of the Frontier Contract of Carriage (revision R1, dated 05/05/26). Dogs and cats must be at least 8 weeks old.

Frontier's Family and Pets page (2026) lists species that are never accepted:

• Large birds such as parrots, macaws, cockatoos and birds of prey
• Rodents other than hamsters and guinea pigs, including mice, rats and squirrels
• Ferrets and beavers
• Reptiles, including snakes, and amphibians
• Spiders and insects

Farm animals and livestock are not on Frontier's accepted list, so poultry, goats, lambs or calves cannot fly as Frontier cabin pets.

Frontier pet carrier size and container rules

The carrier is the most common reason pets are turned away at the gate. Frontier's pet FAQ (2026) sets these limits:

• Soft-sided: maximum 18 inches long x 14 inches wide x 11 inches high
• Hard-sided: maximum 18 inches long x 14 inches wide x 8 inches high
• The pet must be able to stand, turn around and lie down in a natural position
• The carrier must fit under the seat in front of you
• Only one adult dog or cat per container

Frontier recommends soft-sided carriers on both its FAQ and Family and Pets page (2026). The 3-inch height difference matters: a soft bag can compress under the seat, while a rigid kennel cannot.

Does the pet carrier count as my personal item?

Yes, in practice. Frontier's Contract of Carriage (R1, 05/05/26) says the pet container counts toward the carry-on baggage allowance. Frontier's Family and Pets page (2026) adds that, in addition to the pet container, you may bring either a personal item (8 x 14 x 18 inches) or a paid carry-on bag (10 x 16 x 24 inches).

Rules on board: seating, food and behavior

Frontier's Family and Pets page (2026) sets onboard conditions that apply on every domestic flight:

1. You may not sit in row 1 or in an exit row with a pet.
2. The pet stays in its container for the whole flight, including when it is restless.
3. Do not feed or water the pet on board; Frontier recommends no food or water within four hours of departure.
4. The pet must be harmless, not disruptive, odorless and require no attention during flight.
5. No oxygen will be given to a pet in an emergency.

Frontier also notes that most veterinarians advise against sedating pets for flights because tranquilizer effects at altitude are unpredictable. Ask your own veterinarian; this article is not veterinary advice.

Can I fly internationally with a pet on Frontier?

No. Frontier's Family and Pets page (2026) states that Frontier will not accept new pets for international travel and will only accept service animals on international flights. Frontier's Contract of Carriage (R1, 05/05/26) limits international animal carriage to service dogs.

For international trips, Frontier requires service dogs to have a Centers for Disease Control and Prevention (CDC) Dog Import Form receipt, be at least 4 months old, appear healthy on arrival and carry a microchip readable by a universal scanner. The CDC's dog import page (updated August 1, 2024) explains that requirements depend on where the dog was vaccinated and whether it has been in a high-risk country for dog rabies in the previous six months.

Puerto Rico and the U.S. Virgin Islands

Pets can fly to U.S. territories on Frontier's domestic network, but the paperwork is stricter. Frontier's Family and Pets page (2026) says every animal traveling to or from Puerto Rico, including service animals, needs an official health certificate valid for 30 days, rabies vaccination within six months for pets over four months old, external parasite treatment within 72 hours of entry, and official identification such as a microchip or metal ID tag. Pets arriving in the U.S. Virgin Islands need a health certificate and rabies vaccination within six months, except dogs and cats under 12 weeks.

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

Frontier itself does not require a health certificate for cabin pets flying within the U.S., according to its Family and Pets page (2026), but your destination may. The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) states on its interstate pet travel page (last modified June 10, 2026) that it does not regulate the interstate movement of pets by their owners; requirements are set by the receiving state or territory.

That means the rule changes with your arrival airport. Before you fly:

1. Look up your destination on the USDA APHIS state-to-state pet travel page.
2. Contact that state's animal health official if anything is unclear.
3. Ask your veterinarian whether you need a Certificate of Veterinary Inspection and updated rabies vaccination.
4. Carry paper or digital copies of the rabies certificate and any health certificate in your carry-on.

Service dogs and emotional support animals on Frontier

Service dogs fly free on Frontier, but emotional support animals do not count as service animals. The U.S. Department of Transportation (DOT) final rule Traveling by Air With Service Animals, published in the Federal Register on December 10, 2020, defines a service animal as a dog individually trained to do work or perform tasks for a person with a disability, and lets airlines treat emotional support animals as pets.

Frontier's Special Services page (2026) applies that rule as follows:

• Only dogs are accepted as service animals, including fully trained psychiatric service dogs.
• Each passenger may bring up to two service animals.
• Service dogs must be at least 4 months old and leashed, harnessed or tethered at all times.
• You must upload the DOT Service Animal Air Transportation Form at least 48 hours before departure; if you book within 48 hours, present it at the airport.
• Since February 1, 2021, Frontier no longer accepts emotional support animals as such; they may fly under the Pet Policy for the pet fee.
• A passenger with a trained service dog may also bring one pet in the cabin.

Frontier's service animal documentation portal (2026) says typed PDF forms get instant approval or decline, while handwritten forms can take up to 7 days to process. Keep a copy, because staff may ask for it at the airport or on board.

Step-by-step: how to book a pet on Frontier

1. Measure your carrier, including any rigid frame, against the 18 x 14 x 11 inch soft-sided or 18 x 14 x 8 inch hard-sided limits.
2. Confirm your pet is an accepted species and, for dogs and cats, at least 8 weeks old.
3. Book your flight and select Cabin Pet in Passenger Info, or add it later under Manage Trip.
4. Pay the $149 per-direction pet charge in advance to avoid paying at check-in.
5. Choose a seat that is not in row 1 or an exit row.
6. Check your destination state's or territory's entry rules on the USDA APHIS site and get any certificate from your veterinarian.
7. Withhold food and water for about four hours before departure, as Frontier recommends, and arrive early for check-in.

Airline pet rules vs. Animal Passport: not the same thing

Searchers sometimes assume a "pet passport" or "animal passport" is what an airline wants to see. For Frontier domestic flights, the documents that matter are the airline's own booking record and pet charge, any health certificate your destination state requires, and, for service dogs, the DOT Service Animal Air Transportation Form. For international service dog travel, add CDC import documentation.

Animal Passport is a different product. It is a digital animal and livestock passport that identifies an animal by its muzzle print, which is unique like a human fingerprint. A farmer captures the nose print on a phone, and the record binds the owner, breed, estimated age (from a dental photograph, with a confidence score), body condition score on a 1–5 scale from a side-profile photo, and vaccination history.

Animal Passport is not an airline document, not a USDA or CDC travel certificate, and not a government-issued pet passport, and Frontier does not ask for it. Where it has proven useful is in proving ownership when paper records fail: during livestock flood rescue in Pakistan in August 2025, muzzle-print records helped farmers reclaim animals after paper tags washed away. Read more about animal identification on the Animal Passport blog.

Bottom line

As of October 2026, flying with a pet on Frontier Airlines means a small animal, a carrier no larger than 18 x 14 x 11 inches, a $149 charge each way, and a U.S. domestic itinerary. There is no cargo option and no international pet travel, and only task-trained service dogs fly free. Check Frontier's Optional Services page and your destination state's rules on USDA APHIS the week you fly, because both can change without notice.