Everyone wants to know whether Frontier allows pets on domestic flights or not ? Frontier airlines pet policy provides service to their customers for better trips with their pets. Small pets—including dogs, cats, rabbits, guinea pigs, hamsters, and small house birds—are welcome in the cabin. The only animals that can fly internationally are dogs and cats. You must take steps to ensure that you follow  all relevant laws, customs duties. The carrier for your pet must fit under the seat in front of you. Frontier Airlines charges a $99 one-way, directional pet fee. According to the Frontier Airlines Pet Policy, domestic dogs, cats, rabbits, farm animals, hamsters, or small house birds may be transported on domestic flights for a one-way charge. This is more flexible than many other airlines' pet policies. Only domestic cats and dogs may enter or leave other countries. The shipping container must always be maintained for your pet's safety. Pets are not permitted to be checked as luggage. Mental Service Dogs and other trained Assistance Service Dogs, however, are permitted to fly in the cabin for free. At all times, pets must be contained in the travel carrier. It is the responsibility of the pet owner to calm down their disruptive animal without removing it from the pet carrier.