# Underseat

> Airline pet rules, checked against the source. Independent, source-linked reference on flying with pets: cabin pet fees, under-seat carrier size limits, weight limits, cargo rules and travel documents for 18 airlines, plus 20 guides. Every figure is verified against airline and government websites; last full review 2026-10-10.

Key facts: US airlines charge $50 to $150 each way for a pet in the cabin. A carrier of 17 x 10.5 x 8.5 in fits every US airline limit we track. United, Delta and American no longer fly pets in the hold except for military and State Department moves; Alaska and Hawaiian do ($200 each way). British Airways, Emirates and Qatar Airways don't allow pet cats or dogs in the cabin.

## Tools
- [Pet carrier size checker](https://www.underseatpets.com/pet-carrier-size-checker/): compares a carrier's outside size with every airline's under-seat limit. URL parameters: ?l=18&w=11&h=11&unit=in&type=soft&wt=14
- [Dog crate size calculator](https://www.underseatpets.com/dog-crate-size-calculator/): IATA minimum inside crate size from four dog measurements. URL parameters: ?a=30&b=12&c=8&d=24&bed=1&pets=1&unit=in
- [Compare airlines](https://www.underseatpets.com/airlines-that-allow-pets-in-cabin/): sortable table of every airline's pet rules

## Data
- [Airline pet policy data, JSON](https://www.underseatpets.com/api/airlines.json): fees, limits, cargo rules and official sources (CC BY 4.0)
- [Airline pet policy data, CSV](https://www.underseatpets.com/api/airlines.csv)
- [Guide index, JSON](https://www.underseatpets.com/api/guides.json)
- [Full text of every page](https://www.underseatpets.com/llms-full.txt)
- [Agent catalog](https://www.underseatpets.com/.well-known/ai-catalog.json)

## Airline pet policies
- [Air Canada pet policy](https://www.underseatpets.com/airlines/air-canada/): cabin pets allowed, C$50–60 Canada/US; C$100–120 international
- [Alaska Airlines pet policy](https://www.underseatpets.com/airlines/alaska-airlines/): cabin pets allowed, $100 each way; $35 within Hawaii
- [Allegiant Air pet policy](https://www.underseatpets.com/airlines/allegiant-air/): cabin pets allowed, $50 per segment
- [American Airlines pet policy](https://www.underseatpets.com/airlines/american-airlines/): cabin pets allowed, $150 per kennel, each way
- [Delta Air Lines pet policy](https://www.underseatpets.com/airlines/delta-air-lines/): cabin pets allowed, $150 US/Canada; $200 international
- [Frontier Airlines pet policy](https://www.underseatpets.com/airlines/frontier-airlines/): cabin pets allowed, $149 per pet, each way
- [Hawaiian Airlines pet policy](https://www.underseatpets.com/airlines/hawaiian-airlines/): cabin pets allowed, $100 each way; $35 within Hawaii
- [JetBlue pet policy](https://www.underseatpets.com/airlines/jetblue/): cabin pets allowed, $150 each way
- [Southwest Airlines pet policy](https://www.underseatpets.com/airlines/southwest-airlines/): cabin pets allowed, $125 each way; $35 between Hawaiian islands
- [United Airlines pet policy](https://www.underseatpets.com/airlines/united-airlines/): cabin pets allowed, $150 each way
- [WestJet pet policy](https://www.underseatpets.com/airlines/westjet/): cabin pets allowed, C$50–59 Canada/US; C$100–118 elsewhere
- [Air France pet policy](https://www.underseatpets.com/airlines/air-france/): cabin pets allowed, €200 US$225 on US–Europe routes
- [British Airways pet policy](https://www.underseatpets.com/airlines/british-airways/): no pet cats or dogs in the cabin
- [KLM Royal Dutch Airlines pet policy](https://www.underseatpets.com/airlines/klm/): cabin pets allowed, €70–500 each way, by route
- [Lufthansa pet policy](https://www.underseatpets.com/airlines/lufthansa/): cabin pets allowed, Varies by route; not published
- [Turkish Airlines pet policy](https://www.underseatpets.com/airlines/turkish-airlines/): cabin pets allowed, US$75 published interline rate; varies
- [Emirates pet policy](https://www.underseatpets.com/airlines/emirates/): no pet cats or dogs in the cabin
- [Qatar Airways pet policy](https://www.underseatpets.com/airlines/qatar-airways/): no pet cats or dogs in the cabin

## Guides
- [Pet-friendly airlines compared: fees, carriers and rules in 2026](https://www.underseatpets.com/guides/pet-friendly-airlines/): We scored 15 airlines on seven published pet rules: fees, carrier size, weight caps, pets per person, hold and routes. See which fits your dog or cat.
- [Can dogs fly on planes? How flying with a dog works in 2026](https://www.underseatpets.com/guides/can-dogs-fly-on-planes/): Yes, if your dog fits under the seat. The three ways dogs fly, which airlines allow dogs in the cabin, what it costs, and a step-by-step booking checklist.
- [Airline-approved pet carriers: what the label means and which sizes fit](https://www.underseatpets.com/guides/airline-approved-pet-carrier-guide/): No official 'airline approved' or 'TSA approved' pet carrier exists. The real under-seat limits for 15 airlines and the sizes that fit most flights.
- [How much does it cost to fly with a dog? Every airline's pet fee](https://www.underseatpets.com/guides/cost-to-fly-with-a-dog/): Cabin pet fees run $100 to $150 each way on most US airlines. Every airline's pet ticket price, hold and cargo fees, health certificate costs and charters.
- [How to fly with a cat: airlines, fees and a calm travel day](https://www.underseatpets.com/guides/how-to-fly-with-a-cat/): Which airlines take cats in the cabin, what it costs, how to get a cat through airport security, and how to keep the day calm. Fees checked.
- [Service dogs on planes: DOT rules, forms and the registry myth](https://www.underseatpets.com/guides/service-dogs-on-planes/): There's no official US service dog registry. How flying with a service dog works under DOT rules: the forms, the 48-hour deadline, fees, seating and TSA.
- [How big can a dog be to fly in the cabin? Weight and size limits](https://www.underseatpets.com/guides/how-big-can-a-dog-be-to-fly-in-cabin/): US airlines have no cabin weight limit, only carrier size. Europe caps pet plus carrier at 8 kg. How to measure your dog and what to do if it's too big.
- [Dog crate size for air travel: how to measure using IATA's formula](https://www.underseatpets.com/guides/dog-crate-size-for-air-travel/): How to measure your dog for an airline crate with IATA's formula, common crate sizes, and the door, bolt and ventilation rules airlines check.
- [Flying a pet in cargo in 2026: which airlines still do it](https://www.underseatpets.com/guides/flying-pets-in-cargo/): United, Delta and American no longer fly pets in the hold except for military moves. Who still does, what it costs, and temperature and breed rules.
- [Airlines that allow large dogs in the cabin (and what to do if yours is too big)](https://www.underseatpets.com/guides/airlines-that-allow-large-dogs-in-cabin/): No major US airline lets a large pet dog ride in the cabin. ITA Airways now does on some flights, and BARK Air and K9 Jets fill the gap.
- [Snub-nosed dogs and cats on planes: which airlines will fly them](https://www.underseatpets.com/guides/snub-nosed-dog-breeds-airlines/): French bulldogs, pugs and Persians are banned from the hold on most airlines. Airline-by-airline rules and why the cabin is usually the only option.
- [Bringing a dog into the US: CDC rules and the dog import form](https://www.underseatpets.com/guides/bringing-a-dog-into-the-us/): CDC rules for bringing a dog into the US: 6-month minimum age, microchip, CDC Dog Import Form, high-risk country rules and approved airports. Cats too.
- [Pet health certificates for travel: CVIs, USDA endorsement and timing](https://www.underseatpets.com/guides/pet-health-certificate-for-travel/): What a pet health certificate for travel is, when you need a CVI or USDA-endorsed certificate, how long it's valid and which airlines require one.
- [Bringing a dog to Hawaii: quarantine rules, fees and airlines](https://www.underseatpets.com/guides/bringing-a-dog-to-hawaii/): How to bring a dog to Hawaii without quarantine: microchip, two rabies shots, FAVN test, 30-day wait, $185 airport release and which airlines fly pets.
- [Pet passports: how they work, and what to use if you're in the US or UK](https://www.underseatpets.com/guides/pet-passport/): EU pet passports come only from EU vets. The US has no pet passport, so US pets need an APHIS-endorsed EU health certificate. UK post-Brexit rules included.
- [Traveling to Canada with a dog: border rules and the trip home](https://www.underseatpets.com/guides/traveling-to-canada-with-a-dog/): Taking a dog to Canada from the US: rabies certificate rules by age, when you need a health certificate, Air Canada and WestJet fees, and the CDC return.
- [Emotional support animals on planes: what changed and how to fly now](https://www.underseatpets.com/guides/emotional-support-animals-on-planes/): US airlines stopped accepting emotional support animals in 2021. Your ESA dog can still fly as a pet. Airline policies, fees and options for larger dogs.
- [Flying with a puppy: minimum ages by airline and country](https://www.underseatpets.com/guides/flying-with-a-puppy/): Most US airlines fly puppies from 8 weeks, but the US needs dogs to be 6 months to enter and the EU about 15 weeks. Minimum ages by airline, cost and tips.
- [Can you bring a dog on a train? Amtrak, VIA Rail and Europe](https://www.underseatpets.com/guides/dogs-on-trains/): Amtrak takes dogs up to 20 lb with carrier on trips up to 7 hours. VIA Rail, UK, Eurostar, German and French train rules for small and large dogs compared.
- [Road trip with a cat: carriers, litter, food stops and hotels](https://www.underseatpets.com/guides/road-trip-with-a-cat/): How to drive long distance with a cat: securing the carrier, a travel litter box, feeding, hot-car risks, cat-friendly hotels and ID, from vet guidance.

## About
- [How we check](https://www.underseatpets.com/about/)
- [Contact](https://www.underseatpets.com/contact/)