20 lbs (9 kg, dog + carrier combined)
Airline dog policy
JetBlue
JetBlue allows dogs in the cabin on domestic US flights and select Caribbean and Latin American routes. The airline stands out for its generous 20-pound (9 kg) cabin weight limit — higher than most competitors — and reasonable $125 flat fee. JetBlue does not offer any cargo or checked baggage pet service. The airline's network covers the US East Coast extensively, plus routes to the Caribbean, Central America, and London (though UK flights require cargo-only pet import).
Book early and confirm aircraft acceptance.
Under-seat dimensions can vary by aircraft.
Fees can change by region and currency.
Booking tip
JetBlue requires advance booking for cabin pets — add your pet during the booking process online or call customer service. Only one pet per customer and one animal per carrier. JetBlue allows both hard-sided and soft-sided carriers with different size allowances. The 20-lb weight limit gives you more room than the typical 8 kg EU standard, which is helpful for larger domestic shorthairs or the carrier weight. JetBlue's extra legroom seats (Even More Space) are permitted for pet passengers, which helps with carrier space.
Why it can work
The 20-lb cabin weight limit is JetBlue's biggest advantage for dog owners — it's among the most generous in the industry. JetBlue's East Coast hub at JFK (New York) connects well for domestic-to-international transfers if you need to switch to a cargo carrier for UK-bound pets. The airline's Caribbean routes (including Dominican Republic, Puerto Rico, St. Maarten, and Jamaica) are useful for pet owners in the region. JetBlue Mint (premium) class does allow pets, unlike many competitors who ban premium cabin pet travel.
Restrictions
No cargo or checked baggage options. US domestic and select international routes only. One pet per passenger, one animal per carrier. Pets must remain in the carrier for the entire flight. Not available on transatlantic routes to London Gatwick (UK requires cargo import). Dogs must be at least 8 weeks old.
Dog-owner notes
JetBlue participates in limited interline agreements, but pet travel does not transfer between airlines. For international routes, ensure you have a valid health certificate and destination-country import documents. JetBlue's pet policy page has detailed information on accepted carrier brands and sizes. Customer service: 1-800-538-2583.
Final check before paying
Confirm the exact aircraft, route, dog breed, carrier size, temperature rules and destination import law directly with the airline. A country can allow dogs while a specific airline or aircraft refuses them.