Frontier Pet Policy 2026: Cabin Checklist

Frontier allows domesticated dogs, cats, rabbits, guinea pigs, hamsters, and small household birds in the cabin on flights within the United States for a one-way fee (Frontier pet FAQ). Frontier does not transport pets in the cargo hold or as checked pets (Frontier pet FAQ). Each passenger may bring one cabin pet, and the pet must remain in a qualifying travel container throughout the trip (Frontier pet FAQ). Confirm the animal, container, itinerary, and under-seat space with Frontier before booking because some seats may not accommodate the carrier (Frontier Family & Pets). Frontier accepts only service dogs on international flights and says they must meet CDC requirements (Frontier pet FAQ). Keep Frontier's approval separate from permission to enter or cross a border (Frontier Family & Pets).

Does your animal fit the Frontier pet policy?

Start with the animal category. Frontier's domestic cabin-pet list is specific:

Domesticated dogs may travel as cabin pets on flights within the United States (Frontier pet FAQ).
Domesticated cats may travel as cabin pets on flights within the United States (Frontier pet FAQ).
Domesticated rabbits, guinea pigs, and hamsters may travel as cabin pets on flights within the United States (Frontier pet FAQ).
Small household birds may travel as cabin pets on flights within the United States (Frontier pet FAQ).
A pet must be at least 8 weeks old (Frontier pet FAQ).
Each passenger may travel with one pet in the cabin (Frontier pet FAQ).

Do not extend this list to another animal category or airline. The airline pet policies guide can help you organize a separate airline comparison, but Frontier must confirm this booking.

Which Frontier travel path matches your itinerary?

Use the table as a decision check, not as approval for a flight.

Your case	Frontier's published position	What to verify
Listed pet on a flight within the United States	Frontier allows its listed domesticated pets and small household birds in the cabin for a one-way fee (Frontier pet FAQ).	Contact Frontier to confirm its current policy for the itinerary (FAA; Frontier pet FAQ).
Pet presented for checked or cargo transport	Frontier says it does not transport pets in the cargo hold and does not allow checked pets (Frontier pet FAQ).	Do not treat a passenger reservation as checked or cargo pet acceptance (Frontier pet FAQ).
Pet on an international flight	Frontier says it will not accept new pets for international travel (Frontier Family & Pets).	Do not add an ordinary cabin pet to an international itinerary under the domestic policy (Frontier Family & Pets).
Service dog on an international flight	Frontier accepts only service dogs on international flights and says specific requirements apply (Frontier Family & Pets).	Confirm Frontier's current service-animal requirements and its stated CDC requirement before booking (Frontier pet FAQ).

Frontier's decision covers airline transport, while destination or border permission is a separate task (Frontier Family & Pets). The USDA pet travel guide can help you locate that separate path, but it does not approve a Frontier reservation.

Will the animal and carrier fit Frontier's rules?

Frontier says the carrier must let the pet stand, turn around, and lie down in a natural position (Frontier pet FAQ). The carrier must also fit under the seat (Frontier Family & Pets).

Check both the carrier and the animal:

A hard-sided carrier may measure no more than 18 by 14 by 8 inches (Frontier pet FAQ).
A soft-sided carrier may measure no more than 18 by 14 by 11 inches (Frontier pet FAQ).
Frontier recommends a soft-sided carrier (Frontier pet FAQ).
The pet must stay in the travel container at all times (Frontier pet FAQ).
Only one adult dog or cat may travel in one container (Frontier pet FAQ).

The measurements alone do not settle the decision. The animal must be able to use the required natural positions inside the carrier (Frontier pet FAQ), and the carrier must fit under the assigned seat (Frontier Family & Pets). Our dog crate guide for air travel can help you compare carrier designs. It does not replace Frontier's dimensions or approval.

How do you add a pet to a Frontier reservation?

Frontier offers two published routes for adding a cabin pet:

During booking, select Cabin Pet in Passenger Info (Frontier pet FAQ).
After booking, open Manage Trip and select Add Pet in Cabin (Frontier pet FAQ).

Use Frontier's Cabin Pet selection or Add Pet in Cabin path; do not treat the passenger ticket or seat assignment as that add-pet step (Frontier pet FAQ).

Frontier says cabin pets travel for a one-way fee, but the approved source packet does not provide a verified amount for this article (Frontier pet FAQ). Confirm the current charge and the exact reservation with Frontier before paying (Frontier pet FAQ).

Can the carrier fit under your Frontier seat?

Frontier requires the carrier to fit under the seat and warns that some seats may not accommodate it (Frontier Family & Pets). Ask Frontier to check the seat accommodation before booking (Frontier Family & Pets). Do not infer under-seat fit from the carrier's product name.

The FAA says each airline decides whether pets may travel in the passenger cabin (FAA). When an airline permits a cabin pet, the FAA treats the container as carry-on baggage and requires the traveler to follow carry-on rules and flight-attendant stowage instructions (FAA).

What does Frontier not transport?

Frontier does not transport pets in the cargo hold and does not accept checked pets (Frontier pet FAQ). A pet that cannot meet the cabin policy does not become eligible for checked or cargo transport on Frontier under the published pet policy (Frontier pet FAQ).

This article does not reproduce Frontier's excluded-animal categories. Check the live Frontier FAQ for its exact current list before booking.

What changes on an international Frontier flight?

Frontier says it will not accept new pets for international travel and accepts only service animals for international travel under specific requirements (Frontier Family & Pets). Its FAQ states the category more narrowly as service dogs and says they must meet CDC requirements (Frontier pet FAQ).

Do not use domestic cabin-pet acceptance as international approval (Frontier Family & Pets). Confirm Frontier's current service-animal rule before booking (Frontier Family & Pets; Frontier pet FAQ). Then verify destination and border permission separately with the relevant authorities (Frontier Family & Pets).

What should you verify on the day of travel?

Use Frontier's live pages and your reservation for a final check:

Confirm through Frontier's published booking or Manage Trip path that the cabin pet has been added (Frontier pet FAQ).
Confirm that the operating flight remains within the United States if you are using the ordinary cabin-pet policy (Frontier pet FAQ).
Confirm that the animal is at least 8 weeks old and remains within Frontier's published eligible category (Frontier pet FAQ).
Confirm that the carrier stays within the applicable published dimensions and lets the animal stand, turn around, and lie down naturally (Frontier pet FAQ).
Confirm the carrier fits under the assigned seat because Frontier says some seats may not accommodate it (Frontier Family & Pets).
Keep the pet in the container at all times and follow the flight attendant's stowage instructions (Frontier pet FAQ; FAA).

Before booking, Compare expat pet insurance as a separate decision. Insurance does not replace Frontier's approval or destination permission.

Frequently asked questions

What pets does Frontier allow in the cabin?

On flights within the United States, Frontier allows domesticated dogs, cats, rabbits, guinea pigs, hamsters, and small household birds for a one-way fee (Frontier pet FAQ). Each passenger may travel with one cabin pet (Frontier pet FAQ).

How old must a pet be to fly on Frontier?

Frontier says a pet must be at least 8 weeks old (Frontier pet FAQ).

Can Frontier check a pet or carry one in cargo?

No. Frontier says it does not allow checked pets and does not transport pets in the cargo hold (Frontier pet FAQ).

What size pet carrier does Frontier allow?

Frontier lists maximum dimensions of 18 by 14 by 8 inches for hard-sided carriers and 18 by 14 by 11 inches for soft-sided carriers (Frontier pet FAQ). The carrier must fit under the seat and allow the pet to stand, turn around, and lie down naturally (Frontier pet FAQ).

Can a pet leave the carrier during a Frontier flight?

No. Frontier says pets must remain in their travel containers at all times (Frontier pet FAQ).

Does Frontier allow pets on international flights?

Frontier says it will not accept new pets for international travel (Frontier Family & Pets). Frontier accepts only service dogs on international flights and says they must meet CDC requirements (Frontier pet FAQ).

Written by the FG Team, the Furry Guardian editorial team, who keeps these border rules current.