United Flying With Pets: What Owners Need to Know in 2026

United flying with pets means bringing a small cat or dog on a United Airlines flight in the passenger cabin, inside a ventilated carrier that fits under the seat in front of you, for a fee of $150 each way per pet. As of September 2026, United does not accept pets as checked cargo for the general public. Domestic pets can be added on united.com. International trips require a call to United plus government paperwork from the U.S. Centers for Disease Control and Prevention (CDC) and the U.S. Department of Agriculture (USDA).

This guide covers the rules as of September 2026: who can fly, what it costs, which carriers fit, how service animals are treated, and what the government requires when your trip crosses a border. It is written by the Animal Passport editorial team, which covers animal identity and records. Where published sources disagree, we say so.

What Is United's Pet Policy in 2026?

United's pet policy is the airline's set of rules for carrying non-service animals. As of 2026, it has one public option: a cat or dog in the cabin. Paws On Board, a pet-travel policy tracker, last updated its United entry on April 19, 2026. It reports that cargo transport through the PetSafe program "has been discontinued for general passengers" and that only cats and dogs are accepted in the cabin.

The core rules, as compiled by Paws On Board in 2026:

• Species: cats and dogs only.
• Weight and breed: no stated weight limit for cabin pets. The pet only has to fit in an approved carrier under the seat.
• Minimum age: 8 weeks for domestic travel.
• Pets per passenger: up to 2 on most flights, but you must buy the seat next to yours for the second pet. Only 1 pet per person is allowed on the Airbus A319, A320 and A321neo and the Boeing 737-800/MAX 8 and 737-900/MAX 9, because there is less space under the middle seat.
• Seat restrictions: pets cannot sit in exit rows, United Premium Plus seats, or the front row of each cabin.
• In flight: the pet must stay in its carrier under the seat for the whole flight.

How Much Does It Cost to Fly a Pet on United?

United charges $150 each way per pet for in-cabin travel, according to Paws On Board's 2026 policy summary. Other 2026 pet-travel trackers report the same figure. A round trip with one dog therefore costs $300 in pet fees before your own ticket. A second pet costs another $150 each way plus the adjacent seat you must buy.

The long-layover surcharge is less clear. Several third-party guides say United adds a charge when a domestic layover is longer than 4 hours or an international layover is longer than 24 hours. They disagree on the amount: some cite about $125 and others $150. We could not confirm it from a primary United source, so treat either number as an estimate and check the total price when you book. For a deeper breakdown of fees and how United compares with other airlines, see our earlier guide to the United pet fee in 2026.

United Pet Carrier Size Requirements

The carrier decides whether your pet flies. United publishes no weight limit, so size is the real limit. Paws On Board lists these maximum dimensions for 2026:

The carrier must be well ventilated, and your pet should be able to stand and turn around inside it. Before you buy one, check your aircraft type on your booking. The 737 MAX height limit catches out many owners with carriers that fit on other planes.

How to Book a Pet on a United Flight

Cabin pet space is limited on every flight, so add your pet as early as possible. Based on the booking steps Paws On Board summarized from United's policy in 2026:

1. Check eligibility. Make sure your animal is a cat or dog, meets the minimum age, and fits a carrier within the size limits for your aircraft.
2. Book on united.com. Choose "Travel with a pet" for the traveler during booking, or add a pet to an existing reservation in My Trips. Pets cannot be added in the United app.
3. Call for international trips. International pet reservations must be made by phone.
4. Buy a second seat if needed. Two pets require an extra seat next to yours, and they are only possible on aircraft that allow 2 pets per person.
5. Prepare documents. A health certificate is encouraged even for domestic trips, because some destinations may ask for one on arrival. International trips need the government paperwork described below.
6. Check in with your pet. Allow extra time at the airport so the pet fee and pet tag can be processed.

Can Pets Fly in Cargo on United?

Not for most travelers. In 2018, United paused its PetSafe cargo program for a review of pet handling. On May 1, 2018, United announced a collaboration with the animal welfare group American Humane and said PetSafe was "expected to resume operations this summer" (United Airlines newsroom, 2018). The general public program did not come back in that form.

As of 2026, Paws On Board reports that United's hold is open only to active-duty U.S. military personnel, State Department Foreign Service Personnel and their spouses on the Military Pet Program between Guam (GUM) and Honolulu (HNL). The program's rules include:

• Pet plus crate must weigh under 99.9 lb (45.31 kg).
• Crates can be no taller than 34 in, and 700-series crates are not accepted.
• Travelers must email United 5–10 days before travel with their orders.
• A health certificate dated within 10 days of travel is required.

If your dog is too big for an under-seat carrier and you do not qualify for that program, you will generally need a licensed pet shipper, a different airline that still carries pets in the hold, or ground transport.

Service Dogs vs. Emotional Support Animals on United

United's service animal rules follow a federal regulation. In its final rule "Traveling by Air With Service Animals" (Federal Register, December 10, 2020), the U.S. Department of Transportation (DOT) defined a service animal under the Air Carrier Access Act (ACAA) as "a dog, regardless of breed or type, that is individually trained to do work or perform tasks" for a person with a disability. The rule lets airlines treat emotional support animals as pets and limit each passenger to 2 service animals.

The same DOT rule lets airlines require the DOT Service Animal Air Transportation Form. It also allows a relief attestation form for flights of 8 hours or more. United applies this framework, according to Paws On Board's 2026 summary:

• Trained service dogs fly free and do not need a carrier.
• Dogs in training, therapy animals and emotional support animals must travel as pets and pay the $150 fee.
• A passenger may bring up to 2 service dogs, or 1 service dog and 1 pet (the pet needs an extra seat).
• Service dog bookings for international flights and flights to Hawaii and Guam go through United's Accessibility Desk.

Flying Internationally With a Pet on United

International pet travel on United involves two separate systems: the airline's booking rules and each country's entry law. Paying United's fee satisfies only the first. Paws On Board notes that United does not allow pets to or from many international destinations, so confirm your route before planning anything else.

Leaving the United States: USDA APHIS

The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) says the destination country sets pet entry requirements, and these "can change at any time." APHIS tells owners to contact a USDA-accredited veterinarian "as soon as you decide to travel." That veterinarian checks the destination's rules and submits the health certificate for USDA endorsement (APHIS export guidance, last modified August 14, 2026). APHIS also notes that pigs, chickens and other livestock or poultry do not qualify as pets and fall under separate import and export rules.

Returning or Entering the United States With a Dog: CDC

The CDC is the main federal authority for dogs entering the United States, including U.S. dogs coming home. CDC rules in effect since August 1, 2024 say a dog that has been only in dog-rabies-free or low-risk countries for the previous 6 months needs:

• a receipt for the free CDC Dog Import Form, valid for 6 months;
• a microchip that a universal scanner can read;
• an age of at least 6 months at entry;
• a healthy appearance on arrival.

If a U.S.-vaccinated dog has been to a country the CDC lists as high-risk for dog rabies, a USDA-accredited veterinarian must complete the "Certification of U.S.-Issued Rabies Vaccination" before the dog leaves the United States. APHIS stresses that it "cannot be issued retroactively."

Minimum ages are reported differently. United's domestic minimum is 8 weeks, but CDC entry rules require dogs to be 6 months old. Some trackers cite 4 months as United's international minimum for cats. When figures conflict, follow the strictest rule for your route.

Flying to the European Union

The European Commission applies uniform animal health rules to dogs, cats and ferrets under Regulation (EU) 2016/429, the Animal Health Law. Non-commercial pet travel is covered by Commission Delegated Regulation (EU) 2026/131. Pets entering the EU from outside it, with a few exceptions, must pass documentary and identity checks at a designated Travellers' Point of Entry (European Commission, 2026). These are government requirements. A United booking does not replace them.

Is a United Pet Booking a Pet Passport? Clearing Up the Confusion

Owners often mix up three unrelated things:

• A United pet reservation is an airline service. It buys cabin space for a carrier and gives you a receipt, not an identity document.
• Official pet travel documents are issued under government rules. Examples are USDA-endorsed health certificates, the CDC Dog Import Form and EU pet documentation under EU animal health law. They prove health and identity at a border.
• Animal Passport is a digital animal and livestock identity product built on muzzle biometrics. An animal's nose print is unique, like a fingerprint, and is captured with a phone. The record links the owner, breed, estimated age, body condition score and vaccination history to that biometric ID.

Animal Passport estimates age from a dental photograph and reports a confidence score. It scores body condition from 1 to 5 using a side-profile photo. During the August 2025 livestock flood rescue in Pakistan, farmers used it to reclaim animals after paper ear tags washed away. It is not a government-issued travel document. It does not replace a USDA health certificate, a CDC form or an EU pet document, and it does not provide veterinary diagnosis or legal advice. It is an identity and record-keeping tool. Read more on the Animal Passport blog.

Practical Checklist Before You Fly United With a Pet

• Confirm your aircraft type, since it affects both the carrier height limit and whether 2 pets are allowed.
• Measure your carrier against the limits in the table above, especially on 737 MAX flights.
• Book your pet's space early, because cabin pet slots are capped per flight.
• Confirm the total fee, including any layover surcharge, when you book.
• For international trips, contact a USDA-accredited veterinarian weeks ahead. Complete CDC forms before departure if you are returning with a dog.
• Keep vaccination records and microchip numbers where you can reach them at check-in.
• Get your pet used to the carrier at home so it stays calm under the seat.

Last updated September 29, 2026, by Animal Passport. Airline and government pet rules change often, so confirm details with United and the relevant authorities before you travel.