Flying United Airlines with a Cat (2026): Is It the Right US Airline for Your Route?

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United is one of the three large US legacy carriers that allows cats in the cabin on many domestic routes — alongside Delta and American. All three charge the same $150 fee. The differences are in how you book, what carrier you can use, and which routes actually work. Getting the right airline for your situation can save you a wasted call, a rejected carrier, or a trip to Hawaii that was never going to happen.

Here's the decision framework for all three — then the full United guide for those who land there.

Jump to: United vs Delta vs American · Which airline is right for you · What United allows · Exceptions list · How to book · Carrier requirements · What goes wrong · If your route involves the UK · Hotels near United hubs · FAQs

United, Delta, or American — three carriers, one decision

All three allow cats in cabin on domestic US routes. All three charge $150 each way. The policy differences that actually matter for choosing between them:

Search flights: Comparing United with Delta and American? Search and compare flights on Kayak →

Which airline is right for you?

Choose United if:

• You have an existing hard-sided carrier — United accepts hard-sided carriers within its published dimensions, with a clear maximum to check against. American also permits hard-sided carriers on eligible aircraft (verify dimensions with reservations); Delta's policy specifies soft-sided dimensions and recommends soft-sided kennels.
• You want to book online without calling. United lets you add a cat via My Trips — no phone queue needed.
• You're on a widebody route (B767, B777, B787) with a less common itinerary — up to 6 pet spots on widebody aircraft gives you more flexibility than narrowbody options.
• You're booking a premium domestic cabin seat. United allows up to 2 pets in United First on eligible aircraft (Polaris and United Premium Plus excluded; most domestic First cabins work).
• You want to bring two cats. United allows up to 2 pets per person on most aircraft — though on narrowbodies with middle-seat constraints (A319, A320, A321neo, B737 series) it drops to 1. Note: bringing 2 cats requires purchasing a second adjacent seat in addition to two $150 pet fees. Check aircraft type before booking 2.

Consider Delta instead if:

• Your route strongly favours Delta's schedule and you're comfortable calling to book. The phone process is the main friction point — Delta doesn't offer online pet booking at all.
• You're flying Delta First on a domestic non-flat-bed route — Delta allows up to 2 pets in that cabin.
• Carrier dimensions are your deciding factor: Delta's soft carrier maximum is essentially the same as United's (18″×11″×11″ vs 11″×18″×11″ — the same volume, listed in different dimension order). Neither is larger.

For the full Delta comparison: Flying Delta Airlines with a cat (2026).

Consider American instead if:

• You're flying to Alaska and American has the better schedule — American explicitly lists Alaska in its eligible destinations.
• You prefer booking online or via app — American allows adding a carry-on pet through aa.com or the American app, with fee payment and verification at the airport ticket counter.
• Your domestic hop is short and American's route is significantly more convenient.
• American's routes are more limited in scope (12-hour maximum; fewer international destinations). For most complex domestic itineraries, United and Delta offer more.

What United allows on domestic US routes

United allows cats in the cabin on flights operated by United, subject to the carrier meeting requirements and the destination not being on the exceptions list.

Domestic fee: $150 each way, collected at check-in.

No stated weight or breed limit. United's policy page does not impose a maximum weight for cabin pets or restrict any breed from flying in the cabin. This contrasts with some European airlines where the combined cat-plus-carrier limit is strictly enforced at 8 kg. For US domestic United travel, the carrier size is the binding constraint, not the cat's weight.

Two cats per person — with an aircraft caveat. On most United flights, you can bring up to 2 cats, each in their own carrier. However, on aircraft with limited middle-seat under-seat space — A319, A320, A321neo, B737, B737-800/MAX 8, B737-900/MAX 9 — only 1 pet per person is permitted. These narrowbodies cover the large majority of US domestic United routes. Check your aircraft type before booking 2 cats.

Note on seat purchase: Bringing 2 cats requires purchasing a second seat — not just paying two $150 pet fees. United's policy states the second seat must be adjacent to your assigned seat. The full cost of travelling with 2 cats: 2 pet fees ($300 total) plus the price of an additional seat.

A traveller on r/TravelWithPets who flew LAX-ORD with 2 cats confirmed the dual booking worked online via My Trips — but they were on a B757, one of the aircraft where 2 pets per person is allowed. "Check your aircraft before you assume you can do two" was the thread's practical conclusion.

Where United doesn't allow cabin pets

United explicitly prohibits in-cabin pets on flights to, from, or through the following destinations. This applies even if your itinerary only connects through one of these locations:

Australia · Barbados · Brazil · Cuba · Dominica · Dominican Republic · French Polynesia (Tahiti) · Greenland · Guam* · Guyana · Hawaii · Hong Kong · Iceland · Ireland · Jamaica · Marshall Islands · Micronesia · Mongolia · Morocco · New Zealand · Northern Mariana Islands · Palau · Philippines · Saint Kitts and Nevis · South Africa · Spain* (Bilbao only) · Sweden · Taiwan* · Thailand · Trinidad and Tobago · United Arab Emirates · United Kingdom · Vietnam

*Route-specific exceptions apply — see united.com for details.

Hawaii. This catches more US travellers than any other exception. A flight from the mainland to Honolulu is booked identically to any other domestic journey — same app, same fare structure, no passport. But Hawaii is explicitly excluded. If any segment of your journey involves Hawaii, your cat cannot travel in the cabin. There is no workaround.

United Kingdom. UK government rules require all cats entering Great Britain to arrive as cargo via an approved carrier and route, regardless of which airline is flying. United lists the UK as an exception on its own policy page. Cabin travel to or from any UK airport is not possible on United. If your itinerary involves the UK, see the international and transatlantic section below.

Policy source: united.com — Traveling with pets, verified May 2026.

How to book

Book online — no call required. When you have an existing United reservation, go to My Trips, select your booking, and choose "Travel with a pet." This is a meaningful practical advantage over Delta, which requires a phone call for every pet booking. The online flow handles the pet registration and fee payment directly.

For domestic flights, you check in at a kiosk once you arrive at the airport. Unlike Delta (which requires the Special Service Counter for pet check-in), United's domestic pet process runs through the standard kiosk flow after the pet is registered in advance.

Multiple r/TravelWithPets accounts describe the kiosk check-in as straightforward once the pet is registered. One traveller: "I was braced for a whole process and it was just scan, tag, go."

Per-flight pet limits (allocated when you register the pet — first-come, first-served):

Register your pet as early as possible. On popular domestic routes, pet spots fill before departure.

Age minimum: 2 months (8 weeks) for domestic US travel. For international flights: kittens must be at least 4 months old; dogs must be at least 6 months old to comply with CDC requirements. Verify current requirements with United directly before booking any international itinerary.

Seating restrictions:

• Emergency exit rows — not permitted
• United Premium Plus seats — not permitted (explicitly stated in United's policy)
• United Polaris Business Class — not permitted (widebody aircraft list Economy-only pet spots; Polaris cabins are on widebody aircraft)
• Front row of each cabin — not permitted
• Seat selection: avoid bulkhead rows (limited or no under-seat storage in front)

Search flights: Ready to book? Search United flights on Kayak — compare routes and cabins before you register your pet in My Trips.

Carrier requirements

United accepts both hard-sided and soft-sided carriers in the cabin, with published maximum dimensions for each. American also permits hard-sided carriers on eligible aircraft, though you'll need to contact reservations to confirm the dimensions for your specific route. Delta's policy specifies soft-sided carrier dimensions and recommends soft-sided kennels — if you're flying Delta with a hard-sided carrier, verify with Delta directly before travel. United's advantage is the clarity: two sets of published dimensions, one for each carrier type, no ambiguity.

• Soft-sided carrier maximum: 11″ × 18″ × 11″ (27 × 45 × 27 cm)
• Hard-sided carrier maximum: 9″ × 17.5″ × 12″ (22 × 44 × 30 cm)

The carrier must fit fully under the seat in front of you. Your cat must be comfortable inside — able to stand, turn, and lie down without being pressed against the sides.

The 737 MAX height restriction — one of the most common traps. On Boeing 737 MAX aircraft (737-8 and 737-9), the maximum carrier height is 10 inches, not the standard 11 inches. A soft carrier that clears a standard United flight by a margin may be rejected on a MAX route. The restriction is enforced.

A traveller on r/unitedairlines described arriving at O'Hare with a carrier measuring exactly 11" tall — the soft-sided maximum. The agent measured it with a tape measure at check-in. "She said 10 inches maximum on this aircraft. The carrier was an inch over and we spent 20 minutes figuring it out." The traveller was ultimately allowed to board, but the situation was avoidable: check your aircraft type in the booking details before travel and, if any segment is a 737 MAX, choose a carrier 10" or under in height.

Carrier that clears both United’s standard limit and the 737 MAX restriction: The pecute Airline Approved Cat Carrier measures 44 × 23 × 23 cm (17″ × 9″ × 9″) — under United’s 11″ standard height maximum and under the 737 MAX’s 10″ hard ceiling. Around £23 on Amazon UK.

Reducing travel anxiety: Spray FELIWAY Classic inside the carrier 15 minutes before the journey. The vet-recommended pheromone spray works without sedation — cats are typically calmer at the gate and more settled under the seat. Around £17 on Amazon UK.

At security: remove your cat from the carrier and carry them through the metal detector while the carrier goes through the X-ray machine. Your cat goes back into the carrier immediately after. The carrier must remain closed and under the seat for the entire flight.

What goes wrong

1 — Assuming the $150 in-cabin fee applies to your transatlantic ticket

United's website shows a $150 in-cabin pet fee, and it does apply — for US domestic travel. If your itinerary crosses into the UK, the in-cabin option doesn't exist. UK-originating routes are explicitly excluded. Arriving at check-in with a soft carrier for a Heathrow-departure United flight will result in your cat being refused — the domestic fee structure doesn't carry over.

What to do: If any segment of your journey originates from or terminates at a UK airport, treat the entire itinerary as requiring cargo. Read the international section below.

2 — Assuming Hawaii is covered

A mainland US to Hawaii booking looks identical to every other domestic United trip. But Hawaii is explicitly prohibited. There is no in-cabin option to or from any Hawaiian airport on United.

What to do: If Hawaii is your destination, cabin travel isn't an option on United. Research cargo alternatives or consider whether the trip is feasible on current terms.

3 — The 737 MAX height trap

The standard soft carrier maximum on United is 11 inches tall. On Boeing 737 MAX aircraft, the limit drops to 10 inches. Many carriers marketed as "United-approved" meet the 11-inch standard and will fail the more restrictive MAX check. The aircraft type isn't always prominent in the booking confirmation.

What to do: Look up your aircraft type in your booking details (or on the United seat map page for your flight). If it's listed as a 737 MAX-8 or 737-9 MAX, your carrier height must be 10 inches or under. Don't rely on a carrier that was fine on a previous United flight if the aircraft has changed.

4 — Booking 2 cats on a narrowbody expecting the 2-per-person rule to apply

United allows 2 pets per person on most flights, but not on narrowbody aircraft with middle-seat space constraints: A319, A320, A321neo, B737, B737-800, B737-8, B737-900, B737-9. These aircraft represent the majority of US domestic United departures. If your route operates on one of these types, only 1 pet per person is allowed.

What to do: Before booking 2 cats, check the aircraft type for your specific flight. If it's one of the narrowbodies listed above, only 1 pet per person is permitted. Also note: on any eligible aircraft, bringing 2 cats requires purchasing a second adjacent seat — a cost beyond the two $150 pet fees.

5 — Expecting PetSafe to still be available

Many guides written before 2026 describe United's PetSafe programme as the route for transatlantic cat cargo. PetSafe has been discontinued for civilian passengers — United's checked-pet option is now limited to active-duty US military and US State Department Foreign Service personnel travelling on official orders. Calling United directly to book cargo or checked pet transport for a civilian cat will not work through the PetSafe channel.

What to do: For any journey requiring cargo transport — including all transatlantic routes — book through an IATA-accredited pet relocation specialist. They have access to airline cargo channels (which may include United flights) and can confirm which routes and airlines are currently accepting live-animal cargo bookings. See the international section below.

If your route involves the UK or transatlantic travel

UK routes — cabin not possible. UK government rules require all cats entering Great Britain to arrive as cargo via an approved carrier and route, regardless of which airline you book. United lists the UK as an exception on its pet policy. There is no cabin option for UK travel on United.

PetSafe is discontinued. United's checked-pet programme (PetSafe) is no longer available to civilian passengers. United's own cargo/checked-pet channel is now restricted to active-duty US military and State Department Foreign Service personnel on official orders. For civilian transatlantic cat transport, the process runs through a third-party IATA-accredited pet relocation specialist — they have access to multiple airline cargo channels, which may include United flights depending on routing and available cargo space.

How the process works:

1. Contact an IATA-accredited pet relocation company — based in the US if you're originating from the US.
2. Confirm your cat's eligibility, breed, and crate requirements with the agent.
3. The agent identifies a compliant routing, secures a cargo slot, and manages documentation.
4. Prepare paperwork within the correct windows: health certificate timing varies by destination and carrier — often required within 10 days of departure, but confirm with your cargo agent for your specific route. Rabies certificate timing requirements vary by destination; verify United's current requirements directly. USDA endorsement where required.
5. Check-in for cargo is separate from passenger terminal check-in — your agent will confirm location and timing.

Lead time: six to eight weeks is a conservative minimum for transatlantic cat cargo. Start earlier if dates are flexible.

Costs: cargo agent fees for UK↔US cat transport typically run in the range of £800–£2,000+ for a single cat, all-in. Get a written quote before committing to dates.

US to UK documentation (the stricter direction): all cats entering Great Britain must arrive via an approved carrier and route with a government-endorsed Animal Health Certificate, current rabies vaccination, and ISO-compliant microchip. Your US-based cargo agent must be experienced with UK import conditions. The UK to EU cat travel guide covers the UK documentation framework in full.

For international routes outside the UK: United permits cabin cats on some international routes if the destination is not on the exceptions list and documentation requirements are met. Verify directly with United for your specific destination.

Hotels near United hubs

United's main US hubs: EWR (New York Newark), ORD (Chicago O'Hare), IAH (Houston), LAX (Los Angeles), SFO (San Francisco), DEN (Denver), IAD (Washington Dulles).

JFK (New York area): Hotels near JFK that accept cats in the room (2026) — verified options with confirmed cat acceptance and Expedia availability, including the TWA Hotel at Terminal 5 ($75 per-stay pet fee, no shuttle needed). Note: JFK is not a United hub, but many transatlantic routes connect through the New York area, and Newark (EWR) travellers often use JFK-area hotels when overnighting pre- or post-flight. EWR, ORD, LAX, and SFO airport hotel guides for cats are in development.

FAQs

Can I take my cat on United Airlines in the cabin?
Yes, on most domestic US routes — $150 each way. United accepts cats in hard-sided or soft-sided carriers under the seat. Several destinations are excluded, including Hawaii and the United Kingdom.

Does United let me book a pet online?
Yes. Add a pet via My Trips on united.com once you have a reservation. This is an advantage over Delta, which requires a phone call for every pet booking.

What carrier can I use on United?
United accepts both hard-sided and soft-sided carriers, with published maximum dimensions for each. Soft-sided maximum: 11″ × 18″ × 11″. Hard-sided maximum: 9″ × 17.5″ × 12″. On Boeing 737 MAX aircraft (MAX 8 and MAX 9), the height limit is 10 inches regardless of carrier type. American also permits hard-sided carriers but doesn't publish standard dimensions — verify with reservations for your route.

Can I fly to Hawaii with my cat on United?
No. Hawaii is explicitly excluded from United's in-cabin pet policy, even though flights to Hawaii are booked as domestic. There is no workaround.

Can I fly to the UK with my cat on United in the cabin?
No. United lists the UK as an exception. UK government rules require all incoming cats to arrive as cargo. There is no cabin option on any route to or from a UK airport.

Does United still have PetSafe for transatlantic cat cargo?
No. PetSafe has been discontinued for civilian passengers. United's cargo/checked-pet channel is now restricted to military and State Department personnel under official orders. For transatlantic travel, civilians must use an IATA-accredited pet relocation specialist, who can access airline cargo channels including United flights where available.

Can I sit in United First with my cat?
United First on most domestic aircraft allows up to 2 pets. United Premium Plus seats explicitly exclude pets. Polaris Business Class cabins (on widebody aircraft) do not list premium-cabin pet spots — only Economy spots are listed for widebody aircraft. Check the specific seat configuration of your flight.

Can I bring 2 cats on United?
On most flights, yes — 2 pets per person. But on narrowbody aircraft with middle-seat space constraints (A319, A320, A321neo, B737 series), only 1 pet per person is allowed. These cover most domestic US routes. Check your aircraft type before booking 2 cats. Important: United requires purchasing a second adjacent seat when travelling with 2 pets, in addition to the two $150 pet fees.

How old does my cat need to be to fly United?
At least 2 months (8 weeks) for domestic US travel. For international travel, kittens must be at least 4 months old; verify current requirements with United for your destination.

What's the difference between flying with a cat on United vs Delta?
Same fee ($150 each way). Key differences: United allows online booking via My Trips and accepts hard-sided carriers with published dimensions; Delta requires calling to book and recommends soft-sided kennels. Delta's soft carrier dimensions are essentially identical to United's. Both exclude Hawaii and the UK. For a full comparison, see Flying Delta Airlines with a cat (2026).

Sources

• United Airlines — Traveling with pets — verified May 2026
• Delta Air Lines — Pet travel overview — verified May 2026
• American Airlines — Pets — verified May 2026
• UK Government — Bringing a pet to Great Britain
• USDA APHIS — Travel with a pet

Related: If you're comparing options for domestic US cabin travel, see flying Delta with a cat in the US.

Related: Also flying American? Read our full American Airlines cat in cabin guide.

Related: If you need a hotel before or after your flight, see our guide to cat-friendly hotels near LAX.

Related: For overnight stays near ORD on a United itinerary, see cat-friendly hotels near O’Hare for verified cat-confirmed options.

Related: flying Southwest with a cat — no weight limit, two cats per carrier

Related: For a full comparison of US carriers, see how United compares to other US airlines for flying with a cat.