United Airlines Animals in Cabin: What Pet Owners Need to Know in 2026

United Airlines animals in cabin policy, in short: United Airlines lets small, domesticated cats and dogs fly in the passenger cabin inside a ventilated carrier that stays under the seat in front of you for the whole flight. The fee is $150 each way per pet. Carriers can be up to 18 x 11 x 11 inches (soft-sided) or 17.5 x 12 x 9 inches (hard-sided). United publishes no weight or breed limit for cabin pets. Its PetSafe cargo program is closed to the general public, so pets that don't fit under the seat generally can't fly United unless they are trained service dogs.

As of September 2026, this guide pulls together United's published pet rules, the U.S. Department of Transportation (DOT) service animal regulation, and the Centers for Disease Control and Prevention (CDC) dog import rules. Airline policies change without notice, so check the details against United's own pet page before you book.

What does "animals in cabin" mean on United Airlines?

An in-cabin pet on United is a privately owned cat or dog that travels as carry-on alongside a ticketed adult passenger. It is not checked baggage or cargo. PetTravel.com's summary of United's policy (last updated December 2025) says United and United Express accept "small, domesticated cats and dogs" in the cabin on selected domestic and international flights, and that the pet carrier gets a special tag at check-in.

The in-cabin rules date from 2018. NBC News reported in May 2018 that United brought in revised in-cabin procedures after a dog died when a flight attendant told its owner to put the carrier in an overhead bin. Since then, passengers have had to check in with an agent and get a tag for the kennel so cabin crew know a pet is on board.

Which animals can fly in the cabin on United?

Only cats and dogs. According to the policy summaries published by PetTravel.com and Borderless Moves, United does not accept rabbits, birds, reptiles, ferrets or other species as in-cabin pets. Some forum posts claim otherwise, but they don't match United's published rules. Livestock and poultry are excluded from pet travel altogether. The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) says on its Pet Travel page (updated March 2026) that animals "considered livestock or poultry, like pigs or chickens" do not qualify as pets and fall under separate import and export regulations.

Minimum age

• Domestic flights: puppies and kittens must be at least 2 months old, according to both PetTravel.com and Borderless Moves.
• International flights: the sources disagree. PetTravel.com lists 4 months for all pets. Borderless Moves, citing United's current page, lists 6 months for dogs and 4 months for kittens. The 6-month figure for dogs matches the CDC rule that all dogs entering the United States must be at least six months old (CDC, 2024).

How much does United charge for a pet in the cabin?

United charges $150 each way per pet for in-cabin travel, according to the United policy summaries published by PetTravel.com (2025) and Borderless Moves (2026). A round trip with one dog therefore costs $300 in pet fees on top of your own ticket.

Sources disagree on layovers. PetTravel.com says United charges an extra $150 when a connection lasts more than 4 hours in the United States or more than 24 hours outside it. Borderless Moves describes the $150 each-way fee as the entire public fee structure. If your itinerary has a long connection, ask United to confirm the total before you pay.

United Airlines pet carrier size limits

The carrier must fit fully under the seat in front of you with the door closed for the entire flight, and your pet must be able to stand up and turn around inside it. PetTravel.com lists these maximum dimensions for United:

PetTravel.com also says the carrier needs a waterproof bottom, adequate ventilation and secure fasteners, with zippers preferred. A soft-sided carrier can compress slightly to fit, which is why most travelers choose one. Measure your carrier against the limit for your aircraft type before you leave for the airport, because there is no cargo fallback at the gate.

How many pets can you bring, and where can you sit?

• Pets per passenger: up to two, but you must buy an adjacent seat for the second pet, according to PetTravel.com and Borderless Moves.
• Narrow-body limits: Borderless Moves reports that United allows only one pet per person on the Airbus A319, A320 and A321neo and the Boeing 737-800/MAX 8 and 737-900/MAX 9, where there is less room under the middle seat.
• Seats you can't use: emergency exit rows, bulkhead or front-row seats, and United Premium Plus. On some wide-body aircraft, pets aren't allowed in premium cabins because the seats lack under-seat space. The exact list of aircraft differs between sources.
• Limited spaces: each flight takes only a limited number of cabin pets, so add your pet at booking rather than at the airport.

Where does United not allow pets in the cabin?

United bars in-cabin pets on flights to, from or through a list of destinations with strict animal import rules. Both PetTravel.com and Borderless Moves include Australia, Hawaii, Guam, Hong Kong, Ireland, Jamaica, New Zealand, the Philippines, South Africa, Taiwan, Thailand, the United Arab Emirates (Dubai), the United Kingdom and Vietnam, among others.

The two lists aren't identical. Borderless Moves (2026) adds the Dominican Republic, Mongolia and Morocco and lists all of Spain. PetTravel.com (2025) restricts only Bilbao in Spain. A United spokesperson told The Guam Daily Post in May 2024 that pets can't fly in the cabin to, from or through Hawaii, Guam or the Northern Mariana Islands. The one exception is Guam to Tokyo-Narita, and the return trip to Guam isn't allowed. According to the spokesperson, the Hawaii restriction comes from state animal rules.

Can you fly a pet in cargo on United?

Not if you're a member of the public. United paused its PetSafe cargo program in 2018 and relaunched it later that year with new restrictions. Its May 1, 2018 press release said the airline was working with the animal welfare group American Humane. NBC News reported in 2018 that the relaunched PetSafe banned more than 25 short-nosed cat and dog breeds from the cargo hold.

United spokesperson Charlie Hobart told The Guam Daily Post (2024) that United suspended all international PetSafe service on March 19, 2020, and all domestic service on March 25, 2020. The program is still unavailable to the public. The only exceptions are active-duty U.S. military personnel and U.S. State Department Foreign Service personnel traveling on permanent change of station orders. Borderless Moves quotes United's current page as saying: "We no longer let you check your pets through the PetSafe program."

How to book a pet in the cabin on United: step by step

1. Check the route. Make sure no part of your itinerary touches a restricted destination, including connections.
2. Check the aircraft. Look up the aircraft type for each flight. A 737 MAX or another narrow-body can mean a lower carrier height limit or a one-pet limit.
3. Add the pet when you book. Reserve the pet online or through United customer service as early as possible, because cabin pet spaces are limited.
4. Get a compliant carrier. Stay within 18 x 11 x 11 inches (soft) or 17.5 x 12 x 9 inches (hard), and give your pet room to stand and turn around.
5. Prepare documents. PetTravel.com says health certificates are recommended for U.S. domestic flights and required for international ones. Any documents your destination country requires must be ready at check-in.
6. Check in at the counter. Pets can't be checked in at the curb. You pay the fee and get the carrier tag at the counter.
7. Keep the pet in its carrier. Your pet stays in the closed carrier under the seat from boarding until you get off the plane.

Service dogs and emotional support animals on United

Service dogs follow a different set of federal rules from pets. The U.S. Department of Transportation's December 2, 2020 final rule under the Air Carrier Access Act (ACAA) defines a service animal as "a dog that is individually trained to do work or perform tasks for the benefit of a person with a disability". The rule also says airlines no longer have to treat emotional support animals as service animals. Under the rule, airlines may:

• require DOT forms covering the animal's health, behavior and training, and up to 48 hours in advance if the booking was made before then;
• limit each passenger to two service animals;
• require the animal to fit within its handler's foot space and to be harnessed, leashed or tethered at all times.

The DOT rule also prohibits airlines from refusing a service animal based on breed alone. Trained service dogs don't need a carrier and don't pay the pet fee. On United, emotional support and therapy animals travel as regular in-cabin pets, so the $150 fee and carrier limits apply to them.

International trips: CDC dog entry rules still apply

United's cabin approval doesn't cover government entry rules. The CDC announced in May 2024 that, starting August 1, 2024, every dog entering the United States must appear healthy, be at least six months old, be microchipped and come with a CDC Dog Import Form submission receipt. This includes U.S. dogs coming home from abroad. Under the final rule published in the Federal Register on May 13, 2024, travelers flying in must also show that receipt to the airline before boarding.

According to CDC guidance, if your dog has spent the previous six months only in dog-rabies-free or low-risk countries, the Dog Import Form receipt is the only document you need. Dogs that have been in high-risk countries face extra rabies vaccination and documentation requirements. USDA APHIS says on its Pet Travel page (2026) that U.S.-vaccinated dogs that have recently been in a high-risk country need a "Certification of U.S.-Issued Rabies Vaccination" form, submitted by a USDA-accredited veterinarian before the dog leaves the United States. If you're taking a pet abroad, APHIS advises contacting a USDA-accredited veterinarian as soon as you decide to travel.

How United's pet rules differ from Animal Passport

The name can cause confusion, so this section spells out the difference. Animal Passport is not an airline pet ticket, an EU pet passport, a CDC form or a government-issued travel document. None of the airline or government requirements above can be met with an Animal Passport record.

Animal Passport is a digital animal and livestock identity platform built on muzzle biometrics. An animal's nose print is unique, much like a human fingerprint. A farmer or owner captures it with a phone, and the record links the animal to its owner, breed, estimated age, body condition and vaccination history. The platform estimates age from a dental photograph and reports a confidence score. It also gives a body condition score from 1 to 5 based on a side-profile photo.

It was built for animals that paper tags fail to protect. During the livestock flood rescues in Pakistan in August 2025, farmers used Animal Passport records to reclaim animals after their paper tags washed away. That's livestock identity work, a different job from flying a cat to Chicago. For airline travel, rely on United's pet policy, your veterinarian, USDA APHIS and the CDC. More on livestock identity and animal records is on the Animal Passport blog.

Bottom line

United Airlines treats cabin travel as the only public option for pets. That means a cat or dog in an under-seat carrier, $150 each way, a destination that isn't on the restricted list, and a carrier that fits the aircraft you're actually flying. For international trips, the CDC and USDA APHIS rules apply on top of United's policy. Sources disagree on layover fees, the international age minimum and the exact list of banned destinations, so confirm those three points directly with United before you book.