Frontier Airlines, Denver International Airport’s second largest carrier, has recently changed its regulations regarding small pets in the cabin. Certain animals are now allowed on board as long as they are small enough to be placed in an approved carrier that can fit under your seat.
Frontier Airlines charges a $75 fee for one-way travel at check-in when you bring your pet. There are, however, restrictions as to which kinds of animals are permitted on-board. Dogs, cats, guinea pigs, hamsters, rabbits, and small birds are all accepted on Frontier Airlines. Pets that are not allowed on-board include: snakes and other reptiles, amphibians (such as frogs or salamanders), insects, and spiders.
Larger pets must be checked as baggage at the ticket counter for $150 per kennel. This fee must be paid at check-in, so it is important for travelers with larger pets to arrive early and call in advance to reserve space for your pet as these arrangements cannot be made online.
To ensure the safety of your pet, weather restrictions have also been put in place by Frontier Airlines. If the temperature forecast in any city to which you will be traveling is below 45°F (with or without windchill) or above 85°F, Frontier Airlines will not transport your pet without a veterinarian signed Certificate of Acclimation stating that your pet is acclimated to temperatures below or above the usual guidelines.