Frontier Dog Fee in 2026: Cost, Carrier Rules and How to Book

The Frontier dog fee is $149 per pet, per direction, and it is non-refundable, according to Frontier Airlines' Optional Services page as of October 2026. A round trip with one dog therefore costs $298 on top of your fare. Frontier carries dogs only in the cabin, only on domestic U.S. flights, and only in a carrier that fits under the seat in front of you. Dogs must be at least 8 weeks old, and trained service dogs fly without the pet fee.

In plain terms, the Frontier dog fee is the one-way charge Frontier Airlines adds to a booking so a passenger can bring a small dog in an approved carrier into the passenger cabin. The fee covers your dog's place under the seat. It does not buy your dog its own seat, and it does not cover a carry-on bag.

This guide is based on Frontier's own policy pages, the U.S. Department of Transportation (DOT) service animal rule, and guidance from the United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) and the Centers for Disease Control and Prevention (CDC). Airline fees change often, so check the price shown at booking before you fly.

How much is the Frontier dog fee in 2026?

As of October 2026, Frontier Airlines lists a "Pet Charge: $149 per pet, per direction (Non-Refundable)" on its Optional Services fee schedule. The same amount applies to a cat, rabbit or other permitted pet; Frontier does not price the fee by species.

• One dog, one way: $149
• One dog, round trip: $298 ($149 outbound plus $149 return)
• Two dogs, round trip: $596, but only if two passengers each bring one dog, because Frontier allows one pet per passenger

Frontier describes the charge as "one-way, directional." That wording means you pay per direction of travel, not per flight segment. Some carriers price per segment instead: the 2026 CabinPets fee survey lists Allegiant Air at $50 "per segment, per carrier," which grows if a trip has a connection.

The fee is non-refundable. If you cancel your trip or decide to leave your dog at home, Frontier's fee schedule gives no indication that the $149 comes back to you.

What the pet fee does not include

Frontier's Family and Pets policy says that, in addition to the pet's travel container, you may bring either a personal item (8 x 14 x 18 inches) or a carry-on bag (10 x 16 x 24 inches), and "an additional fee will apply for the carry-on bag." So the real cost of flying with your dog is the $149 pet charge, any carry-on or checked bag you buy, and any seat selection fee.

This differs from many airlines, where the pet carrier replaces your personal item. On Frontier, the policy wording treats the carrier as an extra item alongside your personal item.

Which dogs can fly on Frontier?

Frontier's pet policy and its Pets Onboard FAQ set out the eligibility rules as of October 2026:

• Minimum age: domesticated dogs and cats must be at least 8 weeks old.
• Domestic only: pets are allowed in the cabin on all domestic Frontier flights. Frontier states that it "will not accept new pets for International Travel" and accepts only service animals internationally.
• Cabin only: Frontier says it does not carry pets in the cargo hold and does not accept pets as checked baggage.
• One pet per passenger: each passenger may travel with one pet in the cabin.
• One adult dog per carrier: only one adult dog or cat may travel in each container.
• Behavior: your pet must be "harmless, not disruptive, odorless, and require no attention during flight."

Frontier also accepts cats, rabbits, guinea pigs, hamsters and small household birds on U.S. flights. It never accepts large birds, ferrets, reptiles, amphibians, spiders, insects, or rodents such as mice and rats.

Is there a weight limit for dogs on Frontier?

Frontier does not publish a weight limit for cabin pets. The practical limit is the carrier: your dog must be able to stand, turn around and lie down in a natural position inside a carrier that still fits under the seat. A large dog that cannot do that cannot fly on Frontier at all, because Frontier offers no cargo option.

Frontier pet carrier size requirements

Frontier publishes two maximum carrier sizes, both measured as length x width x height:

Frontier notes that some seats cannot fit a pet container and says it will work with you to find a seat with space. You may not sit in row one or an exit row with a pet. Your dog must stay in its carrier for the whole trip, including at the gate and on board.

How to add a dog to a Frontier booking

According to Frontier's Pets Onboard FAQ, there are two ways to add a pet:

1. When you book: select Cabin Pet in the Passenger Info section of the booking flow.
2. After you book: open Manage Trip and choose Add Pet in Cabin.
3. At the airport: if you did not pay in advance, Frontier's policy says you will need to pay when you check in your pet.
4. Before travel day: confirm your carrier measures within 18 x 14 x 11 inches (soft-sided) and check your destination state's animal entry rules.
5. On travel day: Frontier recommends no food or water for pets within four hours of departure and asks you not to feed or water your pet on board.

Frontier also warns that most veterinarians advise against sedating pets for air travel, because the effects of tranquilizers at altitude are unpredictable. Ask your own veterinarian about your dog's needs before you fly.

Do you need a health certificate to fly a dog on Frontier?

For most domestic trips, no. Frontier's policy states that it does not require a health certificate for pets carried in the cabin within the U.S. However, Frontier adds that the state you land in may require one, and that checking destination rules and getting any required health documents is the passenger's responsibility.

Frontier publishes stricter rules for U.S. territories. For Puerto Rico, every animal, 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 a collar with a metal ID tag. The U.S. Virgin Islands require a health certificate and rabies vaccination within six months for dogs and cats aged 12 weeks or older.

USDA APHIS, which regulates pet travel, advises owners taking pets abroad to contact a USDA-accredited veterinarian "as soon as you decide to travel" (APHIS Pet Travel page, last modified March 2026). For dogs entering or returning to the United States, APHIS names the CDC as the primary authority, and the CDC's dog import rules depend on where your dog was vaccinated and which countries it visited in the previous six months. Because Frontier no longer accepts new pets on international routes, those rules mainly matter to Frontier passengers with service dogs.

Service dogs and emotional support animals on Frontier

The pet fee does not apply to trained service dogs. The DOT's final rule on Traveling by Air With Service Animals, published in the Federal Register on December 10, 2020 and effective January 11, 2021, defines a service animal as "a dog, regardless of breed or type, that is individually trained to do work or perform tasks" for a person with a disability. The rule states that airlines "generally cannot charge an individual with a disability for transporting service animals."

Emotional support animals are different. The same DOT rule allows airlines to treat emotional support animals as pets. That means a dog flying as an emotional support animal on Frontier would normally follow the pet rules and pay the $149 per-direction charge. The DOT rule specifically protects psychiatric service dogs that are trained to perform tasks, and those dogs are not charged a pet fee.

Frontier also lets a passenger traveling with a trained service dog bring one pet in the cabin. The pet must meet all pet rules and pay the pet fee. For international travel, Frontier says service dogs need a CDC Dog Import Form receipt, must be at least 4 months old, must appear healthy, and must have a microchip that a universal scanner can read.

How the Frontier dog fee compares with other U.S. airlines

Frontier is a low-cost carrier, but its pet fee is not low. The table below uses figures from the CabinPets 2026 in-cabin pet fee survey, which says it read each airline's official policy page between August 14 and October 3, 2026. Frontier's figure matches Frontier's own fee page. Confirm other airlines' fees on their official sites before booking, as carriers change them without notice.

CabinPets reports a median published U.S.-dollar in-cabin fee of $100 across the airlines it tracks. On a direct round trip, Frontier costs $298 with one dog, compared with $300 on United or Delta and $250 on Southwest. Frontier's advantages are its larger published soft-sided carrier size (18 x 14 x 11 inches, versus 18 x 11 x 11 inches listed for American, Delta and United) and a policy that allows a personal item in addition to the pet carrier.

Frontier dog fee vs. pet passports vs. Animal Passport

People searching for airline pet rules often meet the phrase "pet passport," and it means several different things. It helps to keep them apart:

• Frontier's pet charge is a commercial fee for carrying a pet in the cabin. It is not a document.
• Official travel paperwork, such as a state-required health certificate, a USDA-endorsed export certificate or a CDC Dog Import Form receipt, comes from veterinarians and government agencies. These are what border and agricultural officials check.
• Animal Passport is a digital animal and livestock identity record built on muzzle biometrics. An animal's nose print is unique, like a fingerprint, and is captured with a phone. The record links the owner, breed, an age estimate from a dental photograph with a confidence score, a 1 to 5 body condition score from a side-profile photo, and vaccination history.

Animal Passport is not a government-issued travel document, it does not replace a veterinary health certificate, and Frontier does not ask for it. Its main use is livestock identity. During flood rescues in Pakistan in August 2025, Animal Passport records helped farmers reclaim animals after paper ear tags washed away. USDA APHIS also notes that livestock such as pigs do not qualify as pets for travel purposes, and Frontier does not carry livestock in any case.

For more on animal identification and travel paperwork, see the Animal Passport blog.

Tips to keep your Frontier dog trip affordable

• Pay the pet fee online. Adding Cabin Pet during booking or in Manage Trip avoids sorting it out at the counter, and Frontier's fee schedule lists separate airport agent assistance charges of up to $25.
• Measure before you buy. A soft-sided carrier within 18 x 14 x 11 inches is Frontier's recommended option.
• Skip the carry-on if you can. Your personal item is included; a carry-on costs extra.
• Avoid row one and exit rows. You cannot sit there with a pet, so choose seats accordingly.
• Check your destination's rules early. Puerto Rico and the U.S. Virgin Islands require health certificates and recent rabies vaccinations.

Bottom line

As of October 2026, the Frontier dog fee is $149 per pet, per direction, non-refundable, for a small dog that rides in a carrier under the seat on a domestic flight. Frontier does not carry pets in cargo and no longer accepts new pets on international routes. Trained service dogs fly without the fee under DOT rules, while emotional support animals may be charged as pets. Because Frontier updates its fees regularly, confirm the price on Frontier's Optional Services page before you book.

By Animal Passport. Last updated October 7, 2026.