United Airlines Pet Policy 2026: In-Cabin Rules, Fees, and What Changed for Cargo

Most airlines force you to choose which of your pets stays home when you travel alone, but United Airlines has a surprising exception. Under their current policy, you can fly with two pets in the cabin by purchasing an adjacent second seat. Furthermore, United does not enforce a rigid weight limit for in-cabin pets. As long as your pet can stand up, turn around, and lie down comfortably inside an approved under-seat carrier, they are clear to fly. This makes United one of the most accommodating legacy carriers for pet travel, provided you understand the specific interior dimensions of their fleet and their strict rules for international routes.

Below is the essential overview of the United Airlines pet policy.

• In-Cabin Pet Fee: $150 each way per pet. Layovers longer than 4 hours domestically or 24 hours internationally incur an additional $125 fee.

• Permitted Species: Dogs and cats are allowed in the cabin on most flights.

• Weight Limits: There is no official maximum weight limit for in-cabin pets. The pet must fit comfortably inside an approved carrier.

• Carrier Dimensions: Soft-sided carriers must not exceed 18" L x 11" W x 11" H. Hard-sided carriers must not exceed 17.5" L x 12" W x 7.5" H.

• Cargo & Checked Baggage: Completely suspended for the general public. Only active-duty U.S. military on PCS orders and State Department Foreign Service Officers may ship pets as cargo.

In-Cabin Pet Rules

United Airlines allows you to bring your cat or dog into the cabin on the majority of its domestic flights and select international routes. To secure a spot, your pet must remain inside a fully zipped, leak-proof, and well-ventilated carrier for the entire duration of the journey. The airline does not permit pets to be taken out of their carriers at the gate, during boarding, or while in flight.

Unlike several competitors that cap the combined weight of the pet and carrier at 20 pounds, United has bypassed weight-based restrictions. Your pet's eligibility relies entirely on the fit of the carrier. The animal must be able to stand up naturally, turn around, and lie down without hitting the top or sides of the enclosure. If airport agents observe that your pet cannot move comfortably inside the carrier during the check-in process, they have the authority to deny boarding.

The carrier itself counts as your one carry-on bag or personal item. If you bring a pet carrier, you are still allowed to bring an additional personal item (like a purse or small laptop bag) that can be stored in the overhead bin. However, you cannot bring a standard carry-on suitcase on board unless you have purchased a premium ticket or have MileagePlus status that grants additional baggage allowance.

There are also physical aircraft limitations that dictate how many pets can board. While you can typically bring up to two pets if you buy two adjacent seats, certain aircraft models have highly restricted under-seat spaces. On the Airbus A319, A320, A321neo, Boeing 737-800, 737-8 (MAX 8), 737-900, and 737-9 (MAX 9), United restricts passengers to just one pet per person due to safety and space limitations.

Your seating options are also restricted. You cannot sit in an emergency exit row, a bulkhead row (the front row of any cabin), or in a United Premium Plus seat. These seats do not have under-seat storage space in front of them. Additionally, if you are flying in Economy on a Boeing 757-200, you must choose a window seat to ensure your carrier fits the under-seat configuration.

Cargo and Checked Hold Pet Rules

For the general public, United Airlines does not offer checked baggage or cargo services for live animals. The historical PetSafe cargo program was suspended indefinitely in 2018 following safety reviews and has not been reinstated for standard passenger use. This means if you have a medium or large dog that cannot fit under an economy seat, you cannot fly with them on United Airlines.

The sole exception to this rule applies to active-duty U.S. military members traveling on Permanent Change of Station (PCS) orders and U.S. State Department Foreign Service Officers (FSOs) undergoing a reassignment. If you meet these strict criteria, you and your spouse are permitted to ship your pets via United Cargo.

To book a military or diplomatic pet shipment, you must contact United Cargo directly at least five to ten days before your scheduled departure. The booking process requires you to submit copy of your official PCS or assignment orders, a signed acknowledgment form, and an international health certificate signed by a USDA-accredited veterinarian within ten days of travel.

Pets traveling under these specialized cargo guidelines must be housed in rigid crates made of wood, metal, or tough plastic with a solid roof and ventilation on at least three sides. Cardboard, wire mesh, and collapsible crates are completely banned. The combined weight of your pet and their crate must not exceed 99.9 pounds, and United does not allow any electronic tracking devices (like Apple AirTags) to be attached inside the crate during transit.

Breed Restrictions

For in-cabin travel, United Airlines does not enforce breed-specific bans. You can fly with flat-nosed (brachycephalic) dogs and cats, such as French Bulldogs, Pugs, or Persian cats, as long as they fit comfortably within the carrier size guidelines. However, you must exercise extreme caution when flying with short-nosed breeds. Because of their compromised respiratory tracts, the stress of air travel and the stagnant air under a cabin seat can cause respiratory distress. It is highly recommended to use a soft-sided carrier with mesh ventilation panels on all four sides to maximize airflow.

For military and diplomatic personnel utilizing the cargo exemption, breed restrictions are heavily enforced. Brachycephalic breeds are highly susceptible to heat stroke and breathing issues in cargo environments. For this reason, United Cargo restricts a long list of snub-nosed breeds from flying in the hold, including:

• Dogs: Bulldogs (all types), Pugs (all types), Boxers, Boston Terriers, Mastiffs, Shih Tzus, Lhasa Apsos, Pekingese, and Spaniels (Cavalier King Charles, Cocker).

• Cats: Burmese, Exotic Shorthair, Himalayan, and Persian cats.

Additionally, certain strong-jawed breeds or mixed breeds classified as "dangerous dogs" by international aviation bodies may require custom-built reinforced wooden crates (IATA Container Requirement 82) to be accepted for cargo travel.

International Route Requirements

Taking your pet on an international United flight requires meticulous preparation, as rules vary wildly by destination. Some countries do not allow pets to arrive in the cabin under any circumstances, forcing all inbound animals to enter via manifest cargo. For example, if you are flying to the United Kingdom, Ireland, Hawaii, Australia, or New Zealand, you cannot bring your pet in the cabin on a United flight. If you attempt to board with an in-cabin pet destined for these locations, you will be turned away at the gate.

For routes where in-cabin pets are accepted, such as flights between the U.S. and Canada, Mexico, Central America, or select European destinations, you must provide a valid health certificate. This certificate must be issued by a licensed, government-accredited veterinarian and often requires endorsement by the USDA (for U.S. departures) or the equivalent local agricultural authority.

CDC Guidelines for Entering the United States

If you are flying your dog back into the United States from an international destination, you must comply with the strict Centers for Disease Control and Prevention (CDC) regulations. Under these guidelines:

• Your dog must be at least 6 months old at the time of entry.

• Your dog must have an ISO-compliant 15-digit microchip implanted before receiving their rabies vaccination.

• You must complete the online CDC Dog Import Form and present the printed receipt at check-in.

• If your dog has been in a country considered high-risk for rabies within the past six months, you must also provide a valid USDA-endorsed rabies vaccination certificate and potentially arrive only at designated U.S. airports with CDC quarantine stations.

Failure to have this documentation organized before departure will result in the airline denying boarding to your pet, or worse, your pet being deported or quarantined at your expense upon arrival. Because international documentation rules change frequently, managing these requirements can feel overwhelming. Pet Holiday Club covers 190+ countries with government-sourced, vet-verified pet travel checklists at petholidayclub.com — allowing you to quickly verify the exact paperwork required for your origin and destination.

How to Book a Pet on United Airlines

United Airlines limits the number of pets permitted on each flight, so you should add your pet to your reservation as early as possible.

1. Check space availability: Before purchasing your ticket.

Visit United Airlines website or call their customer service to confirm that the flight you want has not reached its maximum limit for in-cabin pets.

2. Select 'Travel with a pet' during booking: Online via desktop.

When booking your flight on United Airlines website, select the "Travel with a pet" option under the traveler details section. This will automatically add the $150 pet fee to your checkout total. Note that you cannot add a pet to your booking using the United mobile app.

3. Add a pet to an existing reservation: If you already have a ticket.

If you have already purchased your ticket, navigate to the "My Trips" section on United Airlines website, locate your reservation, and select the option to add an in-cabin pet.

4. Call for international routes: Required for all global flights.

If your flight involves an international destination, you cannot complete the pet booking online. You must call United Customer Support to manually add the pet and verify route restrictions.

5. Check in at the ticket counter: On departure day.

On the day of your flight, you must check in with a customer service agent at the airport ticket counter. The agent will inspect your carrier, verify your paperwork, and attach a physical yellow pet tag to your carrier.

You can check all airlines and country guides at Pet Travel Country Guides | Import & Export Rules by Country | Pet Holiday Club

Tips for Flying With Your Pet on United

To ensure your journey through the airport and in the air goes smoothly, keep these specific United Airlines operational tips in mind:

• Opt for a soft-sided carrier: While United accepts both hard-sided and soft-sided carriers, soft-sided options are highly recommended. They have a flexible frame that allows you to compress the top of the carrier by an inch or two to fit beneath unusually low seat configurations without compromising your pet's comfort.

• Locate relief stations via the app: Use the United mobile app before you arrive at your connecting airport to map out the exact locations of post-security pet relief areas. This is incredibly important if you have a tight connection and need to let your pet relieve themselves quickly.

• Keep a printed copy of vaccines: Even if you are flying domestically within the United States, carry a physical copy of your pet's rabies vaccination certificate and a basic health certificate. Although not always requested at check-in, state agricultural officials or airline staff can legally request this paperwork at any point.

• Skip the treats before takeoff: Feed your pet a light meal about four to six hours before the flight to prevent motion sickness. Keep water easily accessible, and use a collapsible silicone bowl for quick hydration stops at the gate.

Pet Travel Comparison: United vs. Competitors

When choosing an airline for your pet, comparing carrier allowances, fees, and age limits side-by-side can help you find the best fit for your travel needs.

Frequently Asked Questions

Q: Can I check my large dog as baggage on United?

No, United Airlines has completely suspended its checked baggage and cargo services for pets belonging to the general public. The only exceptions are active-duty U.S. military members on PCS orders and State Department Foreign Service Officers.

Q: What are the maximum carrier dimensions for United?

Soft-sided carriers can measure up to 18 inches long, 11 inches wide, and 11 inches high. Hard-sided carriers can be a maximum of 17.5 inches long, 12 inches wide, and 7.5 inches high.

Q: How much does United Airlines charge for pets?

United Airlines charges a flat fee of $150 each way for an in-cabin pet. If your itinerary includes a layover longer than four hours domestically or 24 hours internationally, you must pay an additional $125 fee.

Q: Does United Airlines have a pet weight limit?

United does not enforce a specific maximum weight limit for in-cabin dogs and cats. Your pet's eligibility is determined solely by whether they can stand, turn around, and lie down comfortably inside their carrier.

Q: Can I bring two pets on a United flight?

Yes, you can bring up to two pets on most United flights. However, you must purchase an adjacent second seat so both carriers can fit under the seats in front of you.

Q: How old must my puppy be to fly on United?

For domestic flights within the United States, puppies and kittens must be at least two months old to fly. For international flights, dogs must be at least six months old to meet strict entry requirements.

Before flying with your pet on United Airlines, make sure you have the right documentation for your destination. Pet Holiday Club covers 190+ countries with government-sourced, vet-verified pet travel checklists at petholidayclub.com — so you arrive prepared, not refused.