United Airlines Pet Policy 2026: $150 Fee, No Weight Limit

United charges $150 each way to fly with a dog or cat in the cabin. No cargo option exists for regular passengers — PetSafe was discontinued in 2018 and never came back.

The official policy has no weight limit, which sounds generous until you learn that enforcement varies by airport and agent. This guide covers cabin rules, carrier sizes, the booking process, and what actually happens at check-in.

In-Cabin Travel

United allows dogs and cats in the cabin on domestic and select international routes for $150 USD each way per carrier. The fee went up from $125 in April 2024.

Your carrier goes under the seat in front of you. United accepts both soft-sided and hard-sided carriers:

• Soft-sided: 18" × 11" × 11" (46 cm × 28 cm × 28 cm) — can slightly exceed dimensions due to collapsibility
• Hard-sided: 17.5" × 12" × 9" (44 cm × 30 cm × 23 cm)

United has no official weight limit. The policy states "no weight or breed limitations" — the pet just needs to fit comfortably in the carrier. United's current official page doesn't mention a "stand up and turn around" requirement, though some check-in agents still ask for it (see What Travelers Say). The carrier fitting under the seat is the primary test.

Each passenger gets one pet on most narrow-body aircraft (A319, A320, 737 family). On wide-body planes (767, 777, 787), you can bring two pets — buy an adjacent seat and pay a second $150 fee. Your carrier counts as your personal item.

Seat restrictions: No exit rows, no bulkhead, no United Premium Plus (the footrest blocks the space). On the 757-200, Economy passengers with a pet must sit in a window seat. On the 737-800/MAX 8 and 737-900/MAX 9, you need an aisle or window seat — middle seats don't have enough underseat clearance.

Per-flight limits vary by aircraft — typically 4 in Economy, 2 in premium cabins. Wide-body planes (767, 777, 787) allow up to 6 in Economy but don't allow pets in premium cabins due to limited underseat space.

Species

Dogs and cats only. Some third-party sites still list rabbits — that's outdated. United's current policy says cats and dogs.

Cargo and Checked Pets

United doesn't transport pets in cargo or as checked baggage for regular passengers. PetSafe was discontinued in 2018 — this isn't a temporary suspension.

The only exception: active-duty U.S. military on PCS orders and State Department personnel on reassignment can ship pets in cargo between Guam (GUM) and Honolulu (HNL) only. Email militarypets@united.com 5–10 days before travel.

For large dogs that don't fit in a cabin carrier, Alaska Airlines offers cargo at $200 each way.

Service Animals

United accepts trained service dogs only — no emotional support animals, no therapy animals, no dogs in training. ESAs must fly as regular pets in a carrier with the $150 fee.

Service dogs fly free in all cabins. You'll need the DOT Service Animal Training and Behavior Attestation Form — complete it before your flight and save it to your MileagePlus profile. For flights over 8 hours, you also need the DOT Relief Attestation Form.

Service dogs must be at least 4 months old.

Breed Restrictions

None for cabin travel. United has no breed restrictions — flat-faced breeds (French Bulldogs, Pugs, Boston Terriers, Persian cats) fly under the same cabin rules as every other breed.

The military cargo program between Guam and Honolulu does restrict flat-faced breeds, but that only affects military families on PCS orders.

Required Documents

These are United's rules — separate from what your destination may need.

Domestic flights: United encourages a health certificate for domestic travel but doesn't require one. Show up with your pet in an approved carrier and you're set — though some domestic destinations may ask for a certificate on arrival.

International flights: You'll need a rabies vaccination at least 28 days before travel (dogs and cats), plus whatever the destination country asks for — usually a health certificate and potentially a USDA endorsement.

Dogs returning to the US: All dogs entering the US must be at least 6 months old, microchipped, and have a completed CDC Dog Import Form receipt — regardless of where you're coming from. This rule took effect August 1, 2024. For the full re-entry process, see our guide to re-entering the US with your pet.

How to Book a Pet on United

1. Book your flight first on united.com. Select "Travel with a pet" as a traveler option during checkout.
2. Already booked? Add a pet through My Trips on united.com. The United app doesn't support adding pets — website only.
3. International flights: Call 1-800-864-8331 to add a pet. You can't do it online for international routes.
4. Pay the $150 fee at the airport check-in counter — you can't pay online.
5. Check in at the counter. United doesn't allow online check-in when flying with a pet. Plan for this.
6. Arrive 30–60 minutes earlier than normal. The counter check adds time — staff will check the carrier and tag it.
7. At TSA security: Remove your pet from the carrier, carry them through the metal detector, and send the empty carrier through the X-ray. This applies even with TSA PreCheck. For cats that don't tolerate leashes, ask for a private screening — TSA takes you to a small room instead.

Tip

Bring a leash for TSA even if your pet never uses one. You'll carry your pet through the metal detector while the carrier goes on the X-ray belt. Without a leash, a nervous cat or dog can bolt.

Common Mistakes

What Travelers Say

We monitor recent traveler experiences through Reddit, Facebook groups, Twitter, Quora, and other sources. Here's what keeps coming up.

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On the no-weight-limit policy:

"I fly with my dog about 10 times a year. United doesn't have a weight limit — my dog is 23 pounds and she turns around fine in her carrier. Most of the time they just fill out the tag and hand it to me." — Rachel H., frequent United flyer

"United's website doesn't mention the old stand-up-and-turn-around rule anymore. But some agents still enforce it — depends on the airport." — Kate G., United regular

"We have a 14-lb bichon poodle. He lies down and sleeps as we check in, so it looks like he has more headroom. On two occasions the agent almost denied us, but conveniently he was already napping." — David M., bichon poodle owner

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On enforcement at check-in:

"In SFO, the staff asked me to prove my dog could stand and spin in his carrier. He did. They still cancelled my entire reservation because he didn't 'fully stand up.' I'm a Premier Gold member — this situation was insane." — Mark C., SFO

"The exact same thing happened to my wife. Stranded her in Denver, had to scramble for a Southwest ticket. I'm an 850K-mile United flyer and really pissed." — Tom S., Denver

"Something is clearly going on with Houston. They begrudgingly let us go with our dog but said they'd put a 'red flag' on our file. Meanwhile on the return from Pittsburgh, they were sweet about it." — Laura A., Houston IAH

"They asked me to get my cat to stand and turn around. I looked at them blankly and said 'she's a cat — she doesn't do commands.' They realized the ridiculousness and let us through." — Nina W., cat owner

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On carriers and underseat space:

"If your plane has the new NEXT interior, the underseat storage can be very dicey. Like 6–7 inches of space. My 11-inch cat carrier didn't fit — but luckily the flight attendants didn't say anything." — Steve H., 737 MAX passenger

"United's app says soft-sided carriers may exceed dimensions slightly due to collapsibility. Screenshot it before your trip in case the airport staff give you trouble." — Mike B., frequent flyer with dog

Watch Out

Enforcement varies by airport. Houston IAH, SFO, Denver, and Newark are consistently reported as the strictest check-in locations. Outstations with contracted employees tend to be more relaxed.

Tips for Flying United with Your Pet

Use a soft-sided carrier. United's own policy says soft carriers "may exceed dimensions slightly due to collapsibility." This language appears in the app after booking — screenshot it before your trip. Most frequent pet flyers on United use soft carriers for this reason.

Keep old yellow tags on your carrier. United gives you a yellow tag at check-in for your carrier. Leave previous flights' tags attached — it signals to agents that your pet has flown before in that carrier and avoids the "is it going to fit?" conversation.

Pick aisle or window on narrow-body flights. On 737s, A320s, and 757s, middle seats are either banned with pets or have the least underseat clearance. Book aisle or window early.

Check your aircraft type. The new NEXT interior on 737 MAX 8 and MAX 9 has noticeably less vertical space under the seats than older interiors. If your booking shows one of these aircraft, expect a tighter fit — or pick a different flight.

The hidden costs. The $150 fee is just the airline's cut. A carrier runs $30–$100 (the Sherpa Deluxe and Sleepypod Air are the most recommended by United frequent flyers). If you need a health certificate for international travel, that's $150–$300 for the vet visit plus $38 for USDA endorsement. Budget the full picture.

International Routes

United flies pets in the cabin on many international routes — same $150 fee, same cabin rules. But the restricted destination list is one of the longest among US airlines.

United does not allow cabin pets on flights to, from, or through these destinations:

Europe: Iceland, Ireland, Spain (Bilbao only), Sweden, United Kingdom

Caribbean: Barbados, Cuba, Dominica, Guyana, Jamaica, Saint Kitts and Nevis, Trinidad and Tobago

Latin America: Brazil (added February 2024)

Asia-Pacific: Australia, French Polynesia, Hong Kong, Mongolia, New Zealand, Palau, Philippines, Taiwan (select routes), Thailand, Vietnam

Africa / Middle East: Morocco, South Africa, UAE (Dubai)

US Territories / Pacific: Greenland, Guam (inbound only — you can fly a pet FROM Guam to Tokyo-Narita or the US mainland, but not back), Hawaii, Marshall Islands, Micronesia, Northern Mariana Islands

For routes that do allow pets, call 1-800-864-8331 to add a pet. International pet bookings can't be done online. You'll need a rabies vaccination at least 28 days before travel and whatever the destination country asks for — usually a health certificate and a USDA endorsement.

Pets aren't accepted on codeshare or interline bookings — your flight must be operated by United, not a partner airline.

For country-specific entry rules, check our country guides.

How United Compares

United's $150 cabin fee matches Delta and American — all three raised prices in 2024–2025. The trade-off: no weight limit and no breed restrictions. But the lack of cargo and inconsistent enforcement at check-in make it hard to recommend over Southwest ($125, famously relaxed about pets) or Alaska ($100 with cargo). If your pet is borderline on size, Southwest is the safer bet.

FAQ

Your next step: Add your pet to your booking on united.com — pet spots are limited per flight and fill separately from passenger seats. If you're flying internationally, call 1-800-864-8331 instead.