Most U.S. airlines require an in-cabin pet carrier that fits fully under the seat in front of you. As a quick rule of thumb, soft-sided carriers around 17–18 inches long x 11–12 inches wide x 8–11 inches high are commonly accepted. Because under-seat space varies by aircraft, airlines publish their own maximum dimensions—soft-sided carriers can be slightly taller because they compress to fit under the seat.
Typical airline guidelines include:
Weight limits also apply and usually include your pet plus the carrier. Many airlines set an in-cabin maximum around 15–20 lb, though this varies. Your pet must be able to stand up, turn around, and lie down comfortably inside the closed carrier.
Tips for a smooth trip:
If you love a clean, stylish look that keeps pups cozy on the go, explore our travel-friendly carriers and comfort-first designs. See more here: Dog Carrier Bag Black “Seashell” – Guide and Details.
The TSA doesn’t set pet carrier size limits—airlines do. TSA’s role is security screening. Always follow your airline’s published in-cabin carrier dimensions and weight limits.
United is generally firm about carriers fitting fully under the seat. Soft-sided carriers that are within the posted maximums and can compress typically work best. Always confirm the latest measurements and aircraft details before you fly.
Yes. On most fares, bringing a pet in cabin counts as your carry-on item. You can usually still bring one personal item that fits under the seat, but policies can vary—check your specific itinerary.
