How to travel with a pet on United flight? United Airlines allows most dogs and cats to travel in the cabin, providing they are under 20 pounds and able to fit comfortably in a carrier under the seat. Advance notice is required to bring in cabin pets on United flights. If you have any questions related to In Cabin Pet United, you can call 800-864-8331 or +1-844-902-4930 (OTA Skip-Waiting). Passengers can also read a blog about United airlines pet policy at the Airlines Pet Policy website. Visit here: https://www.airlinespetpolicy.com/airlines/united-airlines-pet-policy.html #incabinpetunited #unitedpetpolicy #unitedpetfee #unitedpettravel #unitedpetreservations #uniteddogpolicy #unitedpetincabin #unitedpetincargo