No Weight Limit (must fit in carrier)
Airline dog policy
Frontier Airlines
Frontier Airlines is a US ultra-low-cost carrier that accepts small dogs, cats, rabbits, guinea pigs, hamsters, and small household birds in the cabin on domestic flights. The airline does not offer any checked baggage or cargo pet transport. Frontier's budget-friendly base fares combined with a $99 pet fee make it one of the more affordable options for domestic US dog travel, though the airline's network focuses on leisure routes with limited international service.
Book early and confirm aircraft acceptance.
Under-seat dimensions can vary by aircraft.
Fees can change by region and currency.
Booking tip
Frontier allows you to add a pet during the online booking process, which is a convenience many legacy carriers lack. Only soft-sided carriers are permitted — no hard-sided options. The carrier counts as your personal item, so you will not have a separate personal item allowance. Book early as there is a strict limit per flight. Frontier's seat pitch is tight, so verify your carrier fits under the seat, especially on A321neo aircraft.
Why it can work
The $99 cabin fee is among the lowest of any US carrier, and Frontier's acceptance of rabbits, guinea pigs, hamsters, and small birds gives exotic pet owners more options than most airlines. Online pet booking during the reservation process saves time compared to carriers that require phone calls. Frontier's extensive domestic network covers many secondary cities that other pet-friendly carriers do not serve.
Restrictions
Domestic US flights only — no international pet transport. No checked baggage or cargo options whatsoever. Only one pet per carrier, one carrier per passenger. Pets must remain inside the carrier throughout the entire flight. Not permitted in exit rows. Snakes, reptiles, ferrets, rodents (except hamsters/guinea pigs), spiders, and insects are banned.
Dog-owner notes
Frontier's pet policy is straightforward but limited to cabin-only domestic travel. For owners needing to transport dogs internationally or in cargo, Frontier is not an option. Customer service: 1-801-401-9000. The airline operates from multiple focus cities including Denver (DEN), Orlando (MCO), Las Vegas (LAS), and Miami (MIA).
Final check before paying
Confirm the exact aircraft, route, dog breed, carrier size, temperature rules and destination import law directly with the airline. A country can allow dogs while a specific airline or aircraft refuses them.