Pet-Friendly Airlines: Flying With a Dog, Cat, or Other Pet

"Pet-friendly airline" is not a single standard. Policies differ enough between carriers that the airline you would normally book is not necessarily the best one for flying with a pet — and the differences are not cosmetic. They determine whether your pet travels in the cabin or in cargo, whether your breed is allowed at all, and whether you can book at all.

This guide covers what actually varies between airlines, how to compare them, and what to have ready before you book.

For the booking mechanics themselves, see our guide on booking flights with infants, kids, or pets. This one is about how the airlines compare.

The short answer

Most major US airlines allow small dogs and cats in the cabin for a fee, in an approved carrier that fits under the seat. Larger pets travel as cargo on airlines that offer it — and some airlines do not offer cargo transport at all. In-cabin spots are strictly limited per flight, so with a pet you are booking two things, not one.

What actually varies between airlines

These are the differences that decide whether your trip is possible, and on which carrier.

In-cabin size and weight limits

Airlines set their own limits for pet plus carrier combined, and they are not identical. A pet that qualifies for in-cabin travel on one airline may not on another — and the limit is usually on the combined weight or the carrier's dimensions fitting under the seat, not just the animal.

Measure your carrier before booking. The single most common reason people are turned away at the gate is a carrier that does not fit the specific airline's under-seat dimensions.

Number of in-cabin pet spots per flight

Airlines cap how many pets can travel in the cabin on a given flight, and those spots fill. This is why booking early matters far more with a pet than without one — a flight can have seats available for you and no remaining pet spots.

Breed restrictions

Many airlines restrict or ban short-nosed (brachycephalic) breeds from cargo transport because of the genuine respiratory risk at altitude. Some extend restrictions to cabin travel as well. Breeds commonly affected include bulldogs, pugs, Boston terriers, boxers, and Persian cats.

These restrictions vary by carrier and change, so confirm your specific breed's status directly rather than relying on what you read, including here.

Cargo versus cabin-only policies

Some airlines only allow in-cabin pet travel for small pets and do not carry pets as cargo at all. If your pet is too large for the cabin, that airline simply cannot help you — and this is the difference that most often forces a change of carrier.

Fees

Pet fees vary by airline and route, and are charged separately from your own ticket. They are usually one-way, so a round trip doubles it. Confirm the current fee for your specific airline rather than assuming a flat rate.

Age minimums

Airlines set minimum ages for travel — commonly eight weeks for cabin travel and older for cargo — and some require a veterinary certificate confirming the animal is fit to fly.

How airlines compare on the things that matter

Rather than a static ranking — policies change, and a list is out of date the moment it is written — use this as the comparison framework:

• Does the airline carry pets in the cabin? Almost all major US carriers do, for small pets.
• Does it carry larger pets as cargo? This varies widely and is the most common deal-breaker.
• What is the combined pet-plus-carrier limit? Compare against your actual carrier.
• Does it restrict your breed? Check both cabin and cargo policies.
• How many cabin spots per flight? Determines how far ahead you must book.
• What is the fee, one-way and round trip?

Work through those six questions for two or three carriers and you will have a clearer answer than any published comparison, because you will be comparing against your pet rather than in the abstract.

Documentation to have ready regardless of airline

• Up-to-date vaccination records, particularly rabies, which most airlines require proof of.
• A health certificate from a vet, issued within the window your airline requires — commonly 10 days for domestic travel and often less for international.
• An airline-approved carrier that meets that specific airline's size and ventilation requirements. "Airline approved" on a product listing means it meets some airlines' rules, not necessarily yours.
• A reservation for the pet itself, not just a note on your ticket. Cabin pet spots are booked separately and are limited.

International trips add another layer entirely

International pet travel involves the destination country's import requirements on top of the airline's policy, and meeting one does not satisfy the other. Depending on the country, this can include:

• Quarantine periods, which in some countries are measured in weeks or months
• Additional vaccinations, sometimes required a set number of days before travel
• Import permits applied for in advance
• Microchipping, often required before the rabies vaccination to be valid
• Specific entry points, with pets not permitted to arrive at others

Research the destination's rules first, then find an airline that can meet them — not the other way round. The paperwork timeline is frequently the binding constraint, and some countries require months of preparation.

Emotional support animals and service animals

These are treated very differently from pets, and the rules changed significantly in recent years. Service animals — trained to perform a specific task for a person with a disability — generally travel in the cabin at no charge, with documentation. Emotional support animals are no longer covered by the same rules on US carriers and are typically treated as ordinary pets, meaning they must fit the in-cabin weight and carrier limits and pay the pet fee.

Do not assume an emotional support animal will travel free in the cabin. Confirm with the specific airline before booking.

How to choose the right airline for your pet

1. Confirm your pet and carrier combination meets the airline's in-cabin limit, if you intend to travel in the cabin. Measure the carrier, not the pet.
2. Check whether cabin pet spots remain on your specific flight. Do not assume there is room because seats are available.
3. If your pet does not qualify for the cabin, compare a carrier that offers cargo or larger-pet transport rather than concluding there is no option.
4. Confirm breed restrictions against your specific pet before booking, for both cabin and cargo.
5. Book the pet at the same time as your own ticket, not afterwards.
6. For international travel, research the destination's import requirements before choosing the airline, because they may rule out the trip entirely.

Frequently Asked Questions

Which airlines allow pets in the cabin?

Most major US airlines allow small pets — typically dogs and cats — in an approved carrier in the cabin for a fee. Exact size and weight limits, cabin pet-spot caps, and fees vary by airline, so confirm your specific airline's current policy before booking.

How much does it cost to fly with a pet?

Pet fees vary by airline and route and are charged separately from your own ticket, usually one-way. There is no industry-standard rate — confirm the current fee for your airline, and remember a round trip doubles it.

Are there breed restrictions for flying with pets?

Yes. Many airlines restrict short-nosed breeds — bulldogs, pugs, boxers, Persian cats and similar — from cargo transport because of respiratory risk at altitude, and some extend restrictions to the cabin. Confirm your breed's status with the airline before booking.

Do I need to book a separate ticket for my pet?

Usually yes. Pet travel is booked and paid for separately from your own ticket, and cabin pet spots are limited per flight, so it should be arranged when you book rather than added later.

What documents do I need to fly internationally with a pet?

Typically vaccination records, a vet-issued health certificate within a required window, and whatever the destination country requires — which may include an import permit, microchipping, additional vaccinations, or quarantine. Check both the airline's policy and the destination's rules separately.

Can my pet fly in the cabin if it's too big for a carrier?

No. In-cabin travel requires the pet to fit in an approved carrier under the seat. Larger pets must travel as cargo on an airline that offers it — and not all airlines do, which sometimes means changing carrier entirely.

Do emotional support animals fly free?

Generally not on US carriers anymore. Rules tightened considerably in recent years, and emotional support animals are now typically treated as ordinary pets — subject to the same in-cabin limits and fees. Service animals trained for a specific disability are handled separately and usually travel free in the cabin with documentation.

How far in advance should I book a flight with a pet?

As early as you can. The limiting factor is not seat availability but the cap on cabin pets per flight, which fills quickly on popular routes. For international travel, the destination's paperwork timeline is usually the real constraint and can run to several months.