Do you want to fly with your pets on a Frontier flight? Frontier Airlines Pet Policy allows various species of pets such as dogs, cats, hamsters, rabbits, small birds, etc. on domestic flights with their owners. As for international flights, only dogs and cats are permitted. Also, there are some rules laid down which are to be followed for the safety of the pets as well as other travelers. They can not be taken as luggage and are to be carried in a soft or hard carrier approved by the FAA. Your pet should be at least 8 weeks old to be eligible for travel.