A round trip with a cat in the cabin now costs US$300 on American, Delta, United and JetBlue — 50% more than Southwest's US$250 and three times Alaska's US$200. The airfare line is rarely the biggest one either: a domestic health certificate adds US$50 to US$100, an international one adds a flat US$101 federal endorsement, and a second cat can force you to buy a second seat.
Fees were read from airline pages and 2026 policy summaries in November 2026. Carriers change them without notice — confirm at booking.
What the cabin fee actually buys
The charge is per direction, per carrier, not per trip and not per passenger. Fly out and back with one cat and you pay twice. It buys floor space under the seat in front of you and nothing else — no priority boarding, no guarantee the cat settles.
Your cat also stops being free luggage: on every major US carrier the carrier counts as your personal item. Bring a roll-aboard, a backpack and a cat, and one of the three stays home.
The 2026 US cabin fee table
| Airline | Fee each way | Round trip | Notes |
|---|---|---|---|
| Alaska | US$100 | US$200 | US$35 wholly within Hawaii; 9.5 in carrier height |
| Southwest | US$125 | US$250 | US$35 between Hawaiian islands; domestic only |
| American | US$150 | US$300 | Carrier replaces your carry-on allowance |
| Delta | US$150 | US$300 | Contiguous-US domestic flights; paid at check-in |
| United | US$150 | US$300 | Two pets allowed only if you buy a second seat |
| JetBlue | US$150 | US$300 | 8.5 in soft carrier; six pets per flight |
The spread between the cheapest and the most expensive cabin is US$100 round trip — roughly the cost of the health certificate you will probably need anyway. On one flight, US$50 each way beats most loyalty upgrades.
Two cats, two seats
United accepts up to two pets per passenger, but the second animal requires a second purchased seat next to yours, so the real cost of a second cat is a fare plus US$150 — not US$150. On the A319, A320, A321neo, 737-800, 737-8, 737-900 and 737-9, underseat space is tight enough that United allows only one pet per person regardless.
JetBlue caps cabin pets at six per flight, and the slot cannot be transferred once they sell out.
Paperwork that costs more than the ticket
A domestic move usually needs a certificate of veterinary inspection, commonly US$50 to US$100 at the clinic on top of the exam. International travel adds federal paperwork: USDA APHIS charges US$101 to endorse a certificate carrying no laboratory tests, US$160 for one or two tests on the first pet, and US$206 for three to six tests. The vet's own fee for completing the form is separate and is not capped.
Certificates also expire. Most are valid for 10 days from signing, and an international one cannot be signed until at least 21 full days have passed since the rabies vaccination. Book the vet visit for the right window or you pay twice.
UK: the cabin door is shut
British Airways does not carry cats in the cabin on any route; pets fly in the hold as cargo through IAG Cargo. Most UK-departing flights are the same, so the comparison is cabin fee versus freight.
- Airline freight charge: £100 to £500 depending on route and crate size.
- Animal Health Certificate: about £89 to £250 from an official veterinarian.
- Microchip: £20 to £50, implanted before the rabies vaccine.
- Airline-approved crate: £30 to £300.
A UK-to-US move typically lands between £500 and £2,000. Cats get one break: the tapeworm treatment dogs need before entry is not required.
China: ¥1,288 to ¥1,399 per segment
China's cabin-pet programmes price per pet per flight segment, which makes a connecting itinerary brutal. Hainan Airlines charges ¥1,399, China Eastern ¥1,288 and China Southern ¥1,299 on the routes where cabin transport is offered.
The limits are tighter than in the US: the cat plus carrier must weigh 5 kg or less on Hainan, the service is economy cabin only, one pet per passenger and two per flight, and connecting passengers are not accepted. Bookings close 24 hours before departure, and flat-faced cats such as Persians are refused outright.
Three regions side by side
| Region | Typical cabin charge | Paperwork | Realistic round trip |
|---|---|---|---|
| US (USD) | US$100–150 each way | US$50–100 certificate, or US$101 APHIS endorsement | US$300–400 plus vet fees |
| UK (GBP) | No cabin option; £100–500 freight | £89–250 AHC, £20–50 microchip | £500–2,000 all in |
| China (CNY) | ¥1,288–1,399 per segment | Local animal quarantine certificate | ¥2,576–2,798 plus certificate |
Booking traps that cost US$150 at the gate
Pet places are inventory, not a setting. Six pets per flight on JetBlue, two on a Chinese domestic cabin, one per person on a United narrowbody: when the last slot goes, the fee you saw online is irrelevant. Since 2021, US carriers also treat emotional-support cats as ordinary pets.
The other trap is the carrier. A soft bag 18 inches long but 9 inches tall will not fit Alaska's 9.5-inch limit once the cat is inside and the bag bulges. Measure the loaded carrier, not the empty one.
Is flying worth it? Do the math
Two adults, one cat, a 700-mile move. Flying: two tickets, US$300 in pet fees, US$100 certificate, US$60 carrier — about US$460 before airfare. Driving: 12 hours, roughly US$80 of fuel, no fee, and a US$120 pet-friendly motel halfway. The car is cheaper by several hundred dollars and slower by a full day.
Flying wins when the distance passes about 1,200 miles, when the cat is a confident traveller, and when the alternative is three days of driving in summer heat. It loses badly for a nervous cat on a two-hour hop that could be a four-hour drive.
Before you pay: eight checks
- Confirm the fee in writing at booking; the counter price can differ from the website.
- Reserve the pet slot when you buy the ticket, not at check-in.
- Measure the loaded carrier against that airline's underseat limit.
- Book the health certificate inside its 10-day validity window.
- Check the rabies vaccination date — 21 full days must have passed for international travel.
- Ask whether the pet counts as your carry-on or personal item.
- For two cats, price a second seat before assuming one fee covers both.
- Call about flat-faced breeds; several carriers refuse them in the cabin.
None of this is veterinary advice. A cat with heart disease, recent surgery or a respiratory condition needs your own vet's clearance before flying; airline rules do not replace that assessment.
Frequently asked
Is the pet fee charged per cat or per carrier?
Per carrier, per direction. One cat in one approved carrier is one charge each way, so a round trip is double the one-way fee. Two cats need two carriers and therefore two charges, and on United they also need a second purchased seat.
Why is flying a cat out of the UK so much more expensive?
British Airways and most UK-departing carriers do not accept pets in the cabin, so cats travel as air cargo through a handling agent. Add an Animal Health Certificate at 89 to 250 pounds, a 20 to 50 pound microchip, and a 30 to 300 pound crate, and a UK-to-US move typically totals 500 to 2,000 pounds.
How long before the flight do I need the health certificate?
Most certificates are valid for 10 days from the date the vet signs them, so book the visit inside that window. For international travel the certificate cannot be signed until at least 21 full days after the rabies vaccination, and the microchip must be implanted before that vaccine.