This article was last updated on March 26th, 2025

Want to bring your furry friend along on your next Frontier flight? Unlike many airlines, Frontier only allows pets in the cabin and doesn’t permit them as checked baggage at all. They welcome dogs, cats, and even small critters like rabbits and hamsters on domestic flights. 

In this guide, we’ll walk you through everything you need to know about flying with your pet on Frontier Airlines — from booking to arrival, with all the important details in between. Here’s a quick summary of what to know: 

  • Pets allowed: Dogs, cats, rabbits, guinea pigs, hamsters, small birds (cabin only)
  • Price: $99 per pet, each way
  • Carrier size: Up to 18″L x 14″W x 8″H (hard-sided) or 18″L x 14″W x 11″H (soft-sided)
  • Booking: Book your own ticket first, then add your pet’s ticket by phone or online
  • Health certificates: Required for Puerto Rico and U.S. Virgin Islands
  • International: Pets not allowed on international flights (service dogs only)

How to Book Your Pet’s Travel

Getting your pet booked on a Frontier flight is easy:

  1. First, book your own ticket through Frontier’s website or your preferred booking platform.
  2. You can add your pet during the initial booking by clicking the “Cabin Pet” option. To add to an existing reservation, click the “Add Special Services” button. 
  3. The pet fee can be paid either when booking or when you check in at the airport — whatever works best for your planning.
  4. Make sure you’ve researched any special requirements for your destination (more on that below).

Book your pet’s spot as soon as possible after securing your own ticket. Frontier limits the number of pets allowed on each flight, and these spots fill up quickly, especially during holiday travel seasons. Also, note that Frontier limits pets to one per carrier per passenger. 

What You’ll Pay: Frontier’s Pet Fees

Frontier charges a one-way fee of $99 per pet, per direction. This fee can be paid either when booking or when you check in your pet at the airport.

Important baggage note: Traveling with a pet affects your baggage allowance. You can bring either a personal item (8″H x 14″W x 18″L) OR a carry-on bag (10″H x 16″W x 24″L) in addition to your pet carrier. If you want that carry-on bag, you’ll need to pay an additional fee; something to factor into your travel budget.

Which pets can fly on Frontier?

Not all pets are welcome aboard Frontier flights. Here’s the breakdown:

Pets Welcome in the Cabin (domestic flights only):

  • Dogs and cats (they must be at least 8 weeks old)
  • Rabbits
  • Guinea pigs
  • Hamsters
  • Small household birds

Pets That Can’t Fly on Frontier:

  • Larger birds like parrots and macaws
  • Rodents such as mice, rats, and squirrels
  • Beavers and ferrets
  • Any reptiles or amphibians
  • Spiders and insects
  • And no, you can’t bring your pet lion, tiger, or bear (oh my!)

Service dogs are permitted on all Frontier flights, including international routes, though with additional requirements. Sorry, but emotional support animals don’t have that same right. First time flying with a dog and feeling jitters? Check out our guide on how to fly with a dog. 

Frontier’s Carrier Requirements

Your pet’s carrier needs to meet these specifications:

  • Hard-sided carriers can be up to 18″ length x 14″ width x 8″ height
  • Soft-sided carriers get a bit more height: 18″ length x 14″ width x 11″ height
  • Frontier actually recommends going with a soft-sided carrier
  • The carrier should be roomy enough for your pet to stand, turn around, and lie down naturally
  • It must fit under the seat in front of you
  • Only one adult dog or cat per carrier, please

During Your Flight: What to Expect

Once you’re on board with your pet:

  • Your pet must stay in their carrier the entire time — no mid-flight cuddles, unfortunately
  • You’ll need to avoid row one and exit rows with your pet
  • Skip the in-flight snacks for your furry friend — Frontier recommends not feeding or providing water during the flight
  • Your pet should be odor-free and well-behaved (loud barkers or meowers might not make the best travel companions)
  • Though it might be tempting to calm a nervous pet with medication, Frontier advises against sedation due to unpredictable effects at altitude
  • In case of emergency, be aware that oxygen will not be administered to pets

Health Certificates: Do you need one?

The paperwork requirements vary depending on where you’re flying. For domestic flights, it’s not a huge concern, but if you’re travelling to U.S. territories or internationally, you’ll need to be aware of extra requirements and limitations. 

For Most Domestic Flights:

  • Frontier doesn’t require a health certificate for cabin pets for domestic flights. 
  • If entering the U.S. from abroad, health certificates must be dated within 10 days of entry
  • Health certificates generally need to include the owner’s name and address, animal species, and country of origin/destination
  • Adult pets 3 months and older typically need rabies immunization within the last 12 months
  • Additional recommended vaccinations include hepatitis, PIP, and leptospirosis
  • When in doubt, check with your vet or the USDA’s Veterinary Services

For Puerto Rico (stricter requirements apply):

  • You’ll need a health certificate issued within 30 days of travel
  • Your vet must certify your pet isn’t from a rabies quarantine area
  • Pets over four months need a rabies vaccination within the last six months
  • Your pet will need treatment for external parasites within 72 hours of arrival
  • You’ll also need to provide identification via a microchip or a collar with an ID tag
  • Pack a sturdy collar with two ID tags showing both your home and travel contact info

For U.S. Virgin Islands:

  • You’ll need a health certificate stating your pet isn’t from a rabies quarantine area
  • Rabies vaccination within six months of travel (unless your pet is under 12 weeks)
  • ID tags with your contact information are recommended

International Travel: The Short Answer is No

Planning an international trip with your pet on Frontier? Unfortunately, that won’t work:

  • Frontier does not accept pets on international flights, period
  • Only service dogs can fly internationally, and they face strict requirements
  • Service dogs need a CDC Dog Import Form receipt, must be at least 6 months old, appear healthy, and have a microchip
  • You should also complete the DOT Service Animal Air Transportation Form
  • For Canada, service animals need rabies certificates and health documents in English or French, including proof of parasitic treatment
  • For international travel, rabies vaccinations must be administered no more than one year and no less than 30 days prior to travel
  • If your pet received a rabies booster less than thirty days before an international flight, you’ll need proof of the prior rabies shot