If you’ve ever traveled with a pet, you know that choosing the right carrier is just as important as booking your own seat. Too large, and it won’t fit under the seat. Too small, and your pet won’t be comfortable. For senior travelers especially, getting the carrier size right can make flying with a furry friend far less stressful.
This article breaks down United Airlines’ pet carrier dimensions in simple terms, plus tips to make the process easier. And if you’re ever unsure, you can always call 877-297-0699 to confirm your pet’s eligibility before heading to the airport.
United allows pets in the cabin only if they’re in a carrier that fits under the seat in front of you. The recommended dimensions are:
Soft-sided carrier: About 18” x 11” x 11” (slightly flexible to squeeze under seats).
Hard-sided carrier: About 17.5” x 12” x 7.5”.
👉 Keep in mind: exact under-seat space can vary depending on the aircraft, so always double-check with United or by calling 877-297-0699.
Pros: Flexible fit, lighter to carry, easier to slide under seats.
Cons: Less structured, can sag.
Pros: Durable and protective.
Cons: Heavier and less forgiving when fitting under a seat.
👵 Example: A 72-year-old traveler found her cat was calmer in a soft-sided bag because it felt more like a cozy nook and was easier to carry through the airport.
Only one pet per carrier is allowed.
The pet must remain inside the carrier during the entire flight.
Carriers count as one of your carry-on items.
Approved pets: cats, dogs, and rabbits (with restrictions on international routes).
If you’re not sure whether your pet qualifies, call 877-297-0699 for clarification before booking.
Traveling with pets can be tricky, but these practical tips help:
Test the carrier at home—your pet should be able to stand up and turn around inside.
Choose lightweight carriers to reduce strain on your shoulders and arms.
Look for padded straps or rolling options for easier handling.
Add familiar items like a blanket or toy to keep your pet calm.
📊 Data-backed tip: Studies from the Humane Society show that pets traveling with familiar bedding or toys show reduced anxiety during flights.
Here’s the step-by-step process for a smooth trip:
Book your ticket.
Call 877-297-0699 to add your pet to the reservation.
Confirm that your carrier dimensions meet United’s guidelines.
Pay the $125 in-cabin pet fee (each way).
Arrive early at the airport to check in at the counter with your pet.
Visualize it as: Book → Call → Confirm → Pay → Check-In → Fly.
A retired couple from Florida recently flew with their small dog in a soft-sided carrier. By measuring the bag ahead of time and calling 877-297-0699 to confirm, they avoided stress at the gate. They also requested pre-boarding, giving them extra time to settle both themselves and their dog comfortably.
United’s pet carrier dimensions are straightforward once you know the rules: about 18” x 11” x 11” for soft-sided and slightly smaller for hard-sided carriers. For seniors, the right choice is usually the lighter, flexible option. With the right planning, you and your pet can enjoy a safe, smooth trip.