For in-cabin travel, most airlines require your pet carrier to fit fully under the seat in front of you. While exact dimensions vary by airline and aircraft, a common maximum for soft-sided carriers is around 17–18 inches (L) x 10–11 inches (W) x 9–11 inches (H). Soft-sided carriers are preferred because they can flex slightly to slide under the seat without compromising your pet’s comfort.
Always check two limits: size and weight. Many airlines cap the combined weight of pet and carrier between 15–20 lb. Your dog should be able to stand up, turn around, and lie down comfortably inside. To size correctly, measure your dog from nose to base of tail for length and from floor to top of shoulders (or head for some airlines) for height. Add a little wiggle room, especially for longer flights.
Here’s a quick sizing game plan for stress-free pet travel:
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Hard-sided carriers offer rigid protection but rarely flex under seats. Soft-sided carriers, like our canvas styles, meet most airline footprint rules while keeping pets snug and secure. If your airline allows, a soft-sided option is usually the most cabin-friendly choice for dog travel.
It’s a carrier that meets your airline’s in-cabin rules for size, ventilation, secure closure, leak resistance, and your pet’s ability to stand and turn around. Soft-sided designs that fit fully under the seat are commonly approved.
Yes. On most airlines, including United, your in-cabin pet counts as your carry-on item, and fees apply. You may still bring a personal item that fits under the seat, subject to airline policy.
Possibly—if the dog’s height and length fit a soft-sided carrier within your airline’s under-seat dimensions and the combined weight is within limits. Always measure your dog and confirm your aircraft’s seat specs before booking.
