Frontier Airlines Pet Policy: Complete 2026 Guide for Pets, Service Dogs & ESAs

Frontier Airlines allows small pets to fly in the cabin on flights within the U.S., charges a per-direction pet fee, and does not offer checked baggage or cargo hold options for animals. Emotional support animals are no longer treated as service animals on Frontier flights. Trained service dogs fly under federal DOT rules with required documentation and no pet fee.

Policies checked October 2026 on Frontier’s official Family & Pets and Special Services pages. Airline rules and fees change, so confirm the details with Frontier before you book.

Key Takeaways

• The Frontier Airlines pet policy permits in-cabin travel for domesticated dogs, cats, rabbits, guinea pigs, hamsters, and small household birds on U.S. flights. International travel is far more restricted: Frontier no longer accepts new pets for international travel, and only service dogs are accepted on international routes.

• Frontier charges a non-refundable pet fee of $149 per pet, per direction, according to its Optional Services fee list. A round trip with one pet costs $298 in pet fees alone. Always confirm the current amount on Frontier’s official site before booking.

• Your pet carrier must fit under the seat in front of you. A soft sided carrier can measure up to 18 x 14 x 11 inches, and a hard sided carrier up to 18 x 14 x 8 inches. Pets must remain inside the carrier for the entire Frontier flight.

• Frontier follows federal rules set by the United States Department of Transportation: only trained service dogs qualify as service animals. Emotional support animals are treated as pets and must pay the standard pet fee. Service dog handlers must complete and submit the DOT Service Animal Air Transportation Form.

• Disclaimer: This article is for informational and educational purposes only and is not legal advice. Frontier’s pet policy and fees can change quickly, so always confirm details on the airline’s official page before booking.

How Does the Frontier Airlines Pet Policy Work in 2026?

At a glance, Frontier Airlines pet policy allows in-cabin travel only. The airline does not transport pets in the cargo hold or accept pets as checked baggage.

Allowed cabin pets on U.S. routes include:

• Domesticated dogs

• Cats

• Rabbits

• Guinea pigs and hamsters

• Small household birds

Dogs and cats must be at least 8 weeks old to fly. All animals must remain fully inside an airline-approved pet carrier that fits under the seat for the duration of the flight.

A pet fee applies for in-cabin travel. Frontier charges $149 per pet, per direction, and the fee is non-refundable. Frontier allows one pet per passenger in the cabin, so book your pet as soon as your own ticket is confirmed.

The Frontier Airlines pet policy is entirely separate from the service animal policy. Since February 1, 2021, Frontier no longer accepts emotional support animals as service animals. ESAs must follow the standard pet rules and pay the pet fee.

Which Pets Can Fly on Frontier Airlines?

Frontier is more flexible than some ultra-low-cost carriers when it comes to animal species, but the list is still limited. Frontier allows dogs, cats, rabbits, and hamsters in-cabin, along with guinea pigs and small household birds.

Prohibited animals include:

• Large birds such as parrots and macaws

• Ferrets

• Reptiles and amphibians

• Spiders and insects

• Other rodents beyond guinea pigs and hamsters

Large birds and reptiles are not allowed on Frontier flights. The airline can refuse any animal that appears unsafe, ill, or disruptive to other passengers.

Puppies and kittens must be at least eight weeks old to fly. Do not attempt to travel with unweaned or medically fragile animals.

Because Frontier does not transport pets in the cargo hold, larger dogs that cannot fit comfortably inside a carrier under the seat cannot fly under the pet policy. If you plan to bring small birds or small mammals, check both Frontier’s eligible pets list and any destination-specific species restrictions.

How to Book Your Pet on a Frontier Flight

Book your pet’s spot as soon as possible after your own ticket, especially around holidays and spring break.

Step-by-step booking:

1. Choose your Frontier flight and complete your initial booking.

2. During the passenger information step, look for the option to add a pet. You can add a pet during initial ticket selection online.

3. If you already have an existing reservation, use Manage Trip and select “Add Pet in Cabin,” as described in Frontier’s pets onboard FAQ.

4. Some modifications may require calling Frontier’s customer service line.

The pet fee is added when you confirm the pet reservation and must be paid in full. Remember, this fee is non-refundable even if your travel plans change.

Each passenger can bring one pet container on board, and Frontier’s FAQ allows only one adult dog or cat per container.

Frontier Pet Carrier Rules: Size, Style & In-Cabin Travel

Frontier’s in cabin travel rules center on the pet carrier. If the carrier does not meet their dimensions and safety standards, your pet will be denied boarding.

Maximum carrier dimensions:

Dimensions as listed on Frontier’s Family & Pets page in October 2026.

Frontier recommends a soft sided carrier because it can flex to fit under the seat. Hard sided containers must fully fit without forcing or tilting.

Required carrier features:

• Secure closures (locking zippers or latches)

• Leak-proof bottom

• Adequate ventilation on at least two sides

• Enough interior space for the pet to stand, turn around, and lie down in a natural position

The pet carrier counts toward your cabin items. Frontier lets pet owners bring either a personal item or a carry-on bag in addition to the pet container, and a separate fee applies for the carry-on bag.

“You may not sit in row one or an exit row when traveling with a pet.”

Frontier Airlines, Family & Pets

Make sure your seat assignment accommodates the carrier under the seat ahead of you. Label the carrier with your name and contact info, and attach a sturdy collar and leash for use outside the carrier.

Frontier Airlines Pet Fees and How They Affect Baggage

Most airlines, including Frontier, charge separate pet fees that do not replace standard baggage charges. Frontier charges $149 per pet, per direction. A round trip with one pet costs $298 in pet fees. Always check Frontier’s current fee chart before budgeting your trip.

The pet fee is charged per pet, each way, and is non-refundable. It is separate from any charges for a carry on bag or checked baggage on the same reservation.

Passengers can bring one personal item or one paid carry-on in addition to the pet carrier. Factor the total cost of the pet fee plus bags when comparing Frontier Airlines to other carriers. A low base fare can become expensive once pet and luggage charges are added.

Service dogs traveling as service animals do not pay pet fees but must meet the documentation requirements allowed under DOT regulations.

Do You Need a Health Certificate to Fly Frontier with a Pet?

Frontier does not require a health certificate for in-cabin pets flying within the U.S. However, your destination state may require one on arrival, along with proof of rabies vaccination. Frontier’s pet page asks travelers to check the state requirements of their destination, and the responsibility to do so falls on you.

U.S. territory requirements: Puerto Rico and the U.S. Virgin Islands set their own animal entry rules, including health certificate and rabies documentation. Check the territory’s current requirements and the USDA APHIS pet travel pages well before you fly.

There is an important distinction between Frontier rules (what the airline checks at the gate) and government import rules enforced by agriculture or border agencies at your destination. You and your animal must satisfy both sets of requirements.

Schedule a vet visit well before departure for travel to territories with stricter animal health laws. Bring printed copies of all official health certificates and vaccination records, including proof of any prior rabies shot and rabies booster, in a folder.

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Can You Fly Internationally with a Pet on Frontier Airlines?

Short answer: no. Frontier does not accept new pets for international travel, and only service animals are allowed on international Frontier flights.

“Effective immediately, Frontier Airlines will not accept new pets for International Travel.”

Frontier Airlines, Family & Pets

Earlier policies allowed cabin pets on some international routes. If you plan to fly internationally with a pet, check Frontier’s website carefully before booking.

Frontier Airlines does not transport pets as cargo on international flights. If your itinerary connects through another carrier, that airline’s international pet travel rules will apply separately.

Service dogs can fly internationally under specific requirements listed on Frontier’s Special Services page. Handlers need a CDC Dog Import Form receipt, and the dog must be at least 6 months old, appear healthy, and have a microchip that a universal scanner can detect. Frontier also asks for a health certificate dated within 10 days of entry into the U.S. Requirements depend on where the dog has been, so check CDC’s dog import rules before you book.

If you need to fly internationally with a pet (not a service dog), consider alternative airlines that accept pets in cargo or in the cabin on overseas flights.

Frontier Airlines Service Animal Policy vs. ESAs

Under the ADA and DOT rules, a service animal is a dog individually trained to do work or perform tasks for a person with a disability. Trained psychiatric service dogs are service animals. Dogs whose sole function is comfort or emotional support are not service animals under federal law.

“Dogs whose sole function is to provide comfort or emotional support do not qualify as service animals under the ADA.”

ADA.gov, ADA Requirements: Service Animals

Frontier defines service animals as trained dogs only and limits each passenger with a disability to two service animals, which matches the cap allowed by 14 CFR 382.74. Emotional support animals are not recognized as service animals.

Frontier requires handlers to complete and submit the DOT Service Animal Air Transportation Form. If you book more than 48 hours before travel, the form must be uploaded at least 48 hours before departure; if you book within 48 hours, you submit it in person at the airport. This tracks the advance notice limits in 14 CFR 382.75. The same section lets airlines ask for a separate DOT relief attestation on flight segments of 8 hours or more. If you want help preparing the paperwork, our DOT form service organizes the documents, but the airline still decides on acceptance.

Under the ADA, staff may ask only two questions: whether the dog is required because of a disability, and what work or task it has been trained to perform. DOT rules for airlines use the same two questions. There is no federal requirement for registration, certification, ID cards, or vests.

Frontier has not accepted emotional support animals since February 1, 2021. ESAs on Frontier must follow the standard pet policy, stay in carriers, and pay the pet fee.

If you rely on a psychiatric service dog, understand the difference between an ESA letter (which relates to housing under the Fair Housing Act) and DOT forms for service dogs on aircraft. Never purchase “registrations” that claim to guarantee airline acceptance. There is no official U.S. government registry for service dogs.

Frontier Airlines, ESAs, and Psychiatric Service Dogs (PSD)

Many people who previously flew with emotional support animals now either fly with their pet under the Frontier pet policy (paying the fee, using a carrier) or work with a professional to train a psychiatric service dog that qualifies as a service animal.

An ESA letter from a licensed mental health professional can still matter for housing under the Fair Housing Act (42 U.S.C. 3604(f)(3)(B)). An ESA letter does not, by itself, make an animal a service dog or secure free airline travel.

What makes a psychiatric service dog different from an ESA? The dog is individually trained to perform specific tasks: interrupting panic attacks, grounding during dissociation, or reminding the handler to take medication.

Focus on training and task work rather than “certificates.” There is no official U.S. service dog registry. ID cards and vests are optional identification tools that confer no legal rights, as our guide to real vs fake service dog vests explains.

If you fly Frontier with a psychiatric service dog, complete the DOT Service Animal Air Transportation Form accurately, be ready to describe the dog’s tasks, and make sure the dog can behave calmly in crowded airport and cabin environments. Treat any language about “instant PSD letters” or “guaranteed airline approval” with caution.

Tips to Prepare Your Pet or Service Dog for a Frontier Flight

Good preparation makes pet travel and service dog travel safer and more comfortable for both you and your animal. For the full picture of airport rules, see our guide on how to fly with a service dog.

At-home training:

• Get your pet used to spending time inside the pet carrier, gradually lengthening sessions with treats and praise.

• For service dogs, practice lying quietly at your feet in busy, noisy environments.

• Zip or close the carrier for short periods so your pet does not panic on the day of travel.

Pre-flight vet check:

• Schedule a visit, especially for older animals. Discuss motion sickness and anxiety options with your vet. Many veterinarians advise against routine sedation for flights.

Pack a pet travel kit:

• Collapsible water bowl and small bag of treats (following TSA rules)

• Leash, harness, and sturdy collar

• Spare pee pads or absorbent liners for the carrier

• Waste bags

• Printed copies of vaccines, health documents, and any official health certificates

Day-of-travel tips:

• Feed a light meal several hours before departure. Feeding or providing water to pets during flights is discouraged.

• Offer a bathroom break as close to check-in as possible.

• Arrive earlier than usual. Have your boarding pass and pet confirmation ready.

For service dog handlers:

• Locate service animal relief areas at the airport in advance.

• Practice going through security (walking through the metal detector while gear is X-rayed).

• Have a backup plan if a connection is delayed.

Your animal will do best when both of you know what to expect.

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References

1. Frontier Airlines. Family & Pets. Frontier Airlines, 2026. flyfrontier.com

2. Frontier Airlines. Special Services. Frontier Airlines, 2026. flyfrontier.com

3. Frontier Airlines. Optional Services. Frontier Airlines, 2026. flyfrontier.com

4. Frontier Airlines. Pets Onboard (FAQ). Frontier Airlines, 2026. faq.flyfrontier.com

5. U.S. Department of Transportation. 14 CFR 382.75: Documentation for service animals. Legal Information Institute, Cornell Law School. law.cornell.edu

6. U.S. Department of Transportation. 14 CFR 382.74: Number of service animals. Legal Information Institute, Cornell Law School. law.cornell.edu

7. U.S. Department of Justice. ADA Requirements: Service Animals. ADA.gov. ada.gov

8. Centers for Disease Control and Prevention. Bringing a Dog into the U.S. CDC. cdc.gov

This article is for informational purposes only and is not legal advice.