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ESA Letter » Emotional Support Animal » ESA Travel Policy » Frontier Airlines Pet Policy

Frontier Airlines Pet Policy

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HIPAA recognizes CertaPet as a compliant ESA letter service
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BBB recognizes CertaPet as a legit ESA letter service
Ivana Crnec, DVM
Updated by Ivana Crnec, DVM on December 08, 2025
Frontier Airlines pet policy is flexible, making the airline pet-friendly. It accepts most house pets on domestic flights, allowing one pet per passenger, with a maximum of six pets per flight.  All U.S. airlines, including Frontier, comply with the Department of Transportation (DOT) rules and the Air Carrier Access Act (ACAA). Under these regulations, service […]
Table of Contents

Table of Contents

  • What is Frontier Airlines’ Pet Policy?
  • What Types of Pets Does Frontier Airlines Allow?
  • How Much is Frontier Airlines Pet Fee?
  • How to Add Pets to Frontier Flights?
  • What is the In-Cabin Pet Policy for Frontier Airlines?
  • What is the Recommended Pet Carrier Size for In-Cabin Travel for Frontier Airlines?
  • Is there a Pet Weight Limit for In-Cabin Travel for Frontier Airlines?
  • Does Frontier Airlines Require a Health Certificate for In-Cabin Pet Travel?
  • Can you Bring More than One Pet In-Cabin on Frontier Airlines?
  • Why are Regular Pets not Permitted on International Frontier Flights?
  • Does Frontier Airlines Allow Pets in Cargo?
  • What is Frontier Airlines Policy for Emotional Support Animals?
  • Are ESA Letters Still Required to Fly with ESAs on Frontier Airlines?
  • Can you Fly with an ESA as a Regular Pet on Frontier Airlines?
  • Can Frontier Airlines Deny an ESA?
  • What is Frontier Airlines Policy for Service Animals?
  • What is the Procedure for Flying with a Service Dog on Frontier Airlines?
  • Do you Need to Notify Frontier Airlines in Advance for Flying with a Service Dog?
  • Do Service Dogs Fly for Free with Frontier Airlines?
  • Are there Breed Restrictions for Service Dogs on Frontier Airlines?
  • Can you Bring More than One Service Dog on a Frontier Airline Flight?
  • Are There Size Restrictions for Flying with a Service Dog with Frontier Airlines?
  • Can Frontier Airlines Deny a Service Animal?

Frontier Airlines pet policy is flexible, making the airline pet-friendly. It accepts most house pets on domestic flights, allowing one pet per passenger, with a maximum of six pets per flight. 

All U.S. airlines, including Frontier, comply with the Department of Transportation (DOT) rules and the Air Carrier Access Act (ACAA). Under these regulations, service animals can travel for free and are not required to be in pet carriers. 

However, pets and emotional support animals (ESAs) are not protected under DOT rules or the  ACAA and their ability to travel aboard aircrafts depends entirely on Frontier Airlines pet policy and their availability. Pets, ESAs, and service animals in training must be in carriers and are subject to pet fees, as stated in the Frontier pet policy. 

On international flights, only service dogs are permitted in the cabin. Frontier Airlines dog policy on service animals sets a minimum age of four months for domestic and six months for international flights.

Pet owners asking “Does Frontier allow pets?” must know that the answer is yes. However, restrictions apply, so it’s essential to review Frontier’s policies before booking. It is crucial to understand that since 2021, ESAs are considered as pets and fall under the same travel policies on the majority of aircrafts.

What is Frontier Airlines’ Pet Policy?

Frontier Airlines’ pet policy is inclusive, allowing one domesticated pet per passenger on all domestic flights. Health certificates are not required for pets traveling within the U.S. Pets must remain confined in either soft or hard-sided carriers at all times during the flight. The carriers must fit underneath the seat in front of the passenger traveling with the pet. Frontier does not allow pets or ESAs to be checked as baggage or transported in cargo. 

Due to limited space under the seats and to avoid blocking emergency exits, pet owners cannot sit in the first or any exit row. 

Passengers traveling with pets on Frontier are allowed either one carry-on bag or one personal item. Additional fees apply for carry-on bags. Frontier pet policy includes specific limitations on pet carrier dimensions and permitted pet types. It is important to understand these restrictions before booking a flight. 

Frontier charges a non-refundable, one-way $99 pet fee. The cost is similar to that of other pet-friendly airlines that allow ESAs and pets on board. 

What Types of Pets Does Frontier Airlines Allow?

Frontier Airlines allows specific types of pets on select flights. The airline permits dogs, cats, hamsters, rabbits, guinea pigs, and small household birds on domestic flights within the United States. 

Frontier Airlines dog policy states that dogs must be at least sixteen weeks old to fly, while the Frontier Airlines cat policy requires that cats be at least two months old. 

For international flights, Frontier used to allow dogs and cats on board. However, the policy changed, and the airline now allows only service dogs on international routes. 

Service dogs must meet CDC requirements, which include being healthy and having proper documentation. Additionally, service dogs flying with Frontier must be at least four months old. 

Frontier Airlines does not allow large birds (macaws, birds or prey, cockatoos, parrots), beavers, ferrets, reptiles, rodents (rats, mice, and squirrels), spiders, amphibians, and wild animals. 

How Much is Frontier Airlines Pet Fee?

Frontier Airlines pet fee is $99 per one-way trip, which also applies to ESAs. The amount is non-refundable, applies to a single pet per flight, and only covers travel one way. 

The Frontier pet fee refers to the cost of transporting a pet in the airplane’s cabin. Extra charges may apply for the pet carrier, as it is not considered a permitted standard carry-on item. 

Frontier Airlines pet fee is competitively priced and comparable to that of other major U.S. airlines, such as Alaska and Delta. 

How to Add Pets to Frontier Flights?

The instructions on how to add pets to Frontier flights are given below. 

  1. Add the Pet to the Booking. Complete the passenger information section and then click the “Pet Cabin” tab to add a pet or ESA during initial booking. Enter your last name and confirmation code to check the trip itinerary, and then select the “Special Services” button to include a pet in an existing reservation. 
  2. Pay the Flight’s Pet Fee. Frontier Airlines charges a one-way pet travel fee. You can pay this fee in advance during the booking process or at check-in. 
  3. Comply with the Airline’s Requirements. Review Frontier’s pet policies in advance—including approved pet types, carrier size and type, and required health documentation—to ensure a smooth travel experience. 
  4. Check in with the Pet. Arrive at the airport early and meet a Frontier Airlines representative at the ticket counter. Your pet carrier will be inspected, and you can pay the pet fee at that time if it wasn’t paid earlier.
Can you Travel with a Pet on Frontier Airlines without a Reservation?

No, you cannot travel with a pet on Frontier Airlines without a reservation. Passengers with pets must include their pets during initial flight booking or add them to an existing reservation. 

In either case, the airline must be notified in advance. This is because Frontier Airlines does not allow pets other than service animals on international flights. Also, certain seats may not accommodate pet carriers. 

What is the In-Cabin Pet Policy for Frontier Airlines?

Frontier Airlines has an in-cabin pet policy that allows domesticated pets (dogs, cats, some rodents, and small birds) to fly in-cabin on domestic flights and only service dogs on international flights. 

Frontier Airlines dog policy includes an age requirement. Dogs flying domestically must be at least four months old, while those flying internationally must be over six months.

Pets and ESAs cannot travel freely aboard the aircraft, but they must be comfortably placed in pet carriers. The carriers must meet specific size and type requirements to fit under the seat.  Pets cannot be checked as baggage according to Frontier Airlines’ pet in cabin policy. When flying with Frontier, it is important to book and reserve your flight early and inform the airline that you will be bringing a pet in the cabin. Certain seats cannot accommodate pet carriers, so proper seating arrangements must be made in advance. 

What is the Recommended Pet Carrier Size for In-Cabin Travel for Frontier Airlines?

The recommended pet carrier size for in-cabin travel for Frontier Airlines is 18 in x 14 in x 8 in for hard-sided containers and 18 in x 14 in x 11 in for soft-sided models. 

In accordance with the airline’s policy, Frontier pet carrier size must be spacious enough for dogs to stand, turn around, and lie down, yet compact enough to fit under the seat in front of the passenger travelling with a pet. 

Some seats may not have enough space for pet carriers, so it’s important to notify Frontier in advance and request a seat that meets the required dimensions.

Is there a Pet Weight Limit for In-Cabin Travel for Frontier Airlines?

There is no clear information regarding Frontier Airlines pet policy weight limit on the airline’s website. Most airlines limit the combined weight of the pet and the pet carrier to around 20 to 25 pounds. To confirm specific details about Frontier Airlines pet policy weight limit, it’s best to call the airline in advance and ask about their in-cabin weight restrictions for pets. 

Does Frontier Airlines Require a Health Certificate for In-Cabin Pet Travel?

No, Frontier Airlines does not require a health certificate for in-cabin pet travel. Certificates are not necessary for domestic flights. However, some destinations may require a health certificate upon arrival, depending on local regulations.

Licensed veterinarians are authorized to issue pet health certificates for domestic and international travel. A valid certificate contains detailed information about the pet, such as its breed, age, sex, color, and current vaccination status. 

In the health certificate, the veterinarian certifies that, based on the most recent physical examination, the pet is free of contagious diseases and has not bitten or attacked a person within the past 30 days. 

Can you Bring More than One Pet In-Cabin on Frontier Airlines?

No, you cannot bring more than one pet or ESA in-cabin on Frontier Airlines flights. Frontier allows only one pet per passenger. The airline also restricts the total number of in-cabin pets per flight to six. All pets traveling in the cabin must be placed in carriers, and each pet must be in its own individual pet carrier. 

Why are Regular Pets not Permitted on International Frontier Flights?

Regular pets are not permitted on international Frontier flights due to safety concerns and the complex pet importation regulations in different countries. The airline must comply with CDC regulations regarding animal importation, which can vary significantly by destination. Adhering to these rules is challenging and likely influenced Frontier’s decision to prohibit regular pets and ESAs on international flights. 

Additionally, different countries have specific pet entry requirements, such as health certificates, vaccinations, and other documentation. 

Does Frontier Airlines Allow Pets in Cargo?

No, Frontier Airlines does not allow pets in cargo. The airline permits pets exclusively in the cabin. Pets must be confined in carriers that fit under the seat in front of the owner. 

Frontier Airlines pet cargo policy aligns with that of other major U.S. airlines.. Due to past incidents and safety concerns, many airlines no longer allow pets to travel in cargo.

Transporting pets in cargo can be especially risky for snub-nosed or brachycephalic breeds, such as Pekingese dogs and Persian cats. 

What is Frontier Airlines Policy for Emotional Support Animals?

Frontier Airlines does not accommodate emotional support animals. As of February 1, 2021, the Department of Transportation changed its ESA regulations. 

Today, airlines, including Frontier, are no longer required to accept and fly emotional support animals. ESAs in air travel are now treated as regular pets in air travel. Emotional support pets must be confined in pet containers and are subject to standard pet fees. 

Frontier Airlines ESA policy aligns with federal regulations. The DOT changed the rules due to an increase in violations, such as the use of fake ESA letters and ESA misrepresentation.  

Are ESA Letters Still Required to Fly with ESAs on Frontier Airlines?

No, ESA letters are no longer required to fly with ESAs in Frontier Airlines. The Department of Transportation (DOT) and the Air Carrier Access Act (ACAA) have removed protections for emotional support animals. ESAs in air travel are regarded the same as pets. Therefore, ESA documentation is no longer required, and owners must comply with the airline’s pet policies and pay pet fees. 

Can you Fly with an ESA as a Regular Pet on Frontier Airlines?

Yes, you can fly with an ESA as a regular pet on Frontier Airlines. The U.S. Department of Transportation (DOT) changed its ESA* regulations in 2021. Since then, airlines are no longer required to accept ESAs, meaning that they do not fall under any regulation and they do not benefit from special perks.

Emotional support animals traveling with air carriers are now treated the same way as regular pets. They must be confined in pet carriers of specific types and sizes, and their owners need to pay a pet fee.

*Emotional Support Animals (ESAs) are no longer legally recognized for air travel under the Department of Transportation (DOT) regulations. As a result, CertaPet no longer offers ESA travel letters. However, you may qualify for a Psychiatric Service Dog (PSD), which is protected under the Air Carrier Access Act. A PSD can travel with you in the cabin without additional pet fees.

Can Frontier Airlines Deny an ESA?

Yes, Frontier Airlines can deny an ESA. Since the DOT regulations on ESAs have changed and the ACAA no longer covers them, airlines now have the right to reject emotional support animals. Frontier Airlines reserves the right to deny an ESA if it is aggressive, disruptive, or not properly trained. The airline also refuses ESA accommodations if the owners fail to provide the required documentation. 

What is Frontier Airlines Policy for Service Animals?

Frontier Airlines accepts fully trained service dogs and allows them to travel in aircraft cabins free of charge and without requiring pet carriers. Under the new DOT guidelines, Frontier only accepts dogs recognized as service animals. By definition, a service animal is an animal trained to perform specific tasks that benefit a qualified disabled individual. 

Frontier accommodates fully trained service dogs and psychiatric service dogs. The airline does not recognize service animals in training, comfort animals, or ESAs. 

The main conditions for traveling with service dogs under Frontier service dog policy are completing the DOT’s Service Animal Air Transportation Form and notifying the airline at least 48 hours in advance. 

Frontier Airlines service animal policy also enforces age restrictions. The airline does not accept service dogs younger than four months old. 

Handlers are allowed to travel with up to two service dogs under Frontier service dog policy. Service animals must be under control by being harnessed, leashed, or tethered, and must behave properly in public.

What is the Procedure for Flying with a Service Dog on Frontier Airlines?

The procedure for flying with a service dog on Frontier Airlines is explained below. 

  1. Confirm Eligibility. Frontier Airlines allows fully trained service dogs that are more than four months old. Service dogs in training and puppies are not accepted. 
  2. Complete the Paperwork. Complete the Service Animal Air Transportation Form and have a printed copy of the document available at all times. 
  3. Notify the Airline in Advance. Frontier requires a 48-hour notice period for travelers planning to bring service animals. 
  4. Book a Reservation. Select the trained service animal special request when booking or update the reservation online if adding the animal at a later time. 
  5. Choose the Right Seat. Service dogs cannot sit in the exit row or block passage in case of an emergency. If the handler prefers and the dog’s size allows, they may be placed in pet carriers. 
  6. Talk to an Airline Representative. Once at the airport, speak with an airline representative to confirm the disability and the dog’s qualifications as a fully trained service animal. 
  7. Prepare for the Flight. Pack all the service dog’s travel essentials, such as collapsible bowls, spare leashes, treats, and plastic bags. 
  8. Check International Requirements. For international flights, the minimum age is six months, and handlers must present the receipt for the CDC Dog Import Form. 

The service dog handler is responsible for the dog’s behavior. Service dogs on Frontier flights must remain under the owner’s constant control and supervision. The owner guarantees that the service dog will not relieve itself and will behave properly in public, without posing a risk to others. 

Do you Need to Notify Frontier Airlines in Advance for Flying with a Service Dog?

Yes, you need to notify Frontier Airlines in advance of flying with a service dog. Frontier Airlines requires notification at least 48 hours before departure so that proper arrangements can be made. 

Handlers must notify the airline at least 48 hours prior to travel and submit a completed U.S. Department of Transportation Service Animal Air Transportation Form. 

When flying with service animals on international flights with Frontier Airlines, passengers must also provide valid animal health certificates. 

Do Service Dogs Fly for Free with Frontier Airlines?

Yes, service dogs fly for free with Frontier Airlines. The Air Carrier Access Act (ACAA) protects service animals and requires airlines to provide appropriate accommodations at no additional cost.. 

Frontier Airlines allows fully trained service dogs to travel free of charge on both domestic and international flights. However, service dogs in training are not eligible for these benefits. 

Are there Breed Restrictions for Service Dogs on Frontier Airlines?

No, there are no breed restrictions for service dogs on Frontier Airlines. In accordance with the Air Carrier Access Act, all airlines must permit service dogs regardless of their breed.

However, Frontier has specific requirements for service animals, such as being well-behaved, having completed training, and being under the handler’s control and supervision.

Can you Bring More than One Service Dog on a Frontier Airline Flight?

Yes, you can bring more than one service dog on a Frontier Airlines flight. The airline allows passengers with disabilities to fly with up to two trained service animals.

Passengers must notify Frontier Airlines about their travel arrangements at least 48 hours in advance and complete the required U.S. Department of Transportation Service Animal Air Transportation Form

Are There Size Restrictions for Flying with a Service Dog with Frontier Airlines?

No, there are no size restrictions for flying with a service dog with Frontier Airlines. Frontier allows service animals of all sizes as long as they are over four months old and fully trained. 

Unlike regular pets and emotional support animals, service dogs are allowed to travel outside of pet carriers. This no-carrier policy enables large service dogs to travel in cabin with their owners 

Can Frontier Airlines Deny a Service Animal?

Yes, Frontier Airlines can deny a service animal. Certain circumstances permit the airline to refuse service animal accommodations. 

For example, Frontier can deny service animals if they are disruptive (such as barking excessively, growling, or biting), pose direct threats to the safety and health of passengers (like urinating or defecating in the cabin), or are not under the handler’s control. 

Frontier Airlines also reserves the right to refuse service animals if they do not have proper documentation or are not fully trained. Frontier only accepts fully trained service dogs that are over four months old.

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Ivana Crnec, DVM

Ivana Crnec, DVM

Veterinarian

Ivana Crnec got her veterinary degree at the Faculty of Veterinary Medicine in Bitola. She then continued her education at the Faculty of Veterinary Medicine in Zagreb, Croatia, where she specialized in domestic carnivores.

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