Airline pet policies are notoriously hard to navigate. The information is scattered across different pages, buried in FAQ sections, and often contradicts what customer service tells you over the phone. One of the most common questions that rarely gets a clear answer upfront: Can you buy an extra seat for your dog?

The answer depends entirely on which airline you book. Some allow it. Most don’t. And even among the ones that do, what “buying a seat for your dog” actually means varies significantly. Here’s the breakdown you won’t find easily on airline websites.

The Short Answer That Most Owners Don’t Expect

Most major US airlines do not allow you to purchase a seat specifically for your dog. This catches a lot of travelers off guard because the logic seems sound. You’re willing to pay for the space. The seat would otherwise be empty. But airline policies don’t work that way, and walking up to check-in assuming you can sort it out on the day is not a plan.

Among the major US scheduled carriers, only a small number offer any kind of extra seat arrangement for dogs, and even then, what “buying a seat for your dog” actually means looks different depending on who you’re flying with.

What “Buying a Seat” Actually Means

This is where it gets worth reading carefully. There are two types of extra seat arrangements: primary seats and comfort seats, and they are not the same thing.

A primary seat means you are purchasing the seat specifically and directly for your dog. A comfort seat means you are buying an adjacent seat for your own comfort, but you may be able to use the extra floor space or seat surface for your dog’s carrier, depending on the airline’s policy. Most major carriers that allow any kind of extra seat fall into the comfort seat category. Your dog still stays in their carrier. They still go under the seat. You just have more room around you.

The Airlines That Do Allow It

JetBlue is one of the few major US carriers that lets you purchase a seat solely for your dog. Your dog must remain in their carrier at all times, but you can place the carrier on the seat next to you during the flight, or keep it on your lap. For taxi, takeoff, and landing, the carrier must go under the seat. The combined weight of the dog and carrier cannot exceed 20 pounds, which limits this option to smaller breeds. JetBlue also has relatively affordable base fares, which makes the cost of a second seat less prohibitive than it might be on other airlines.

Delta, United, and Alaska all offer comfort seat purchases, which are extra seats bought primarily for your own legroom that can also benefit traveling with a dog. Your dog stays in their carrier under the seat in front of the empty seat, but the extra space gives you significantly more room to manage during the flight. Delta recommends calling ahead and speaking with an agent rather than attempting to book online. United allows you to take up to two carrier dogs per flight with a comfort seat arrangement, which is unusual among major carriers. Alaska Airlines offered a similar comfort seat option for dogs, though as of mid-2025, this is no longer available for new bookings, so it is worth calling to confirm the current policy before assuming it applies to your trip.

Southwest and American Airlines do not currently offer any formal extra seat arrangement for dogs. Dogs traveling on these carriers must remain in an airline-approved carrier under the seat in front of you for the duration of the flight, and no adjacent seat purchase option is available for pets.

What to Know Before You Book

Even on airlines that do allow extra seat purchases for dogs, there are consistent rules worth knowing. Your dog stays in their carrier for the duration of the flight, regardless of what seat you’ve purchased. The carrier still needs to be airline-approved. Weight limits apply to the combined weight of the dog and carrier, and those limits tend to cap out around 20 pounds for in-cabin travel on major US airlines.

Certain seats are also off-limits regardless of airline. Emergency exit rows and bulkhead seats typically cannot be used when traveling with a pet, so factor that into seat selection when booking.

One practical note: comfort seats generally cannot be booked online. You will need to call the airline directly and speak with an agent to confirm availability and get the arrangement set up correctly before your travel date. Trying to handle it at the gate or check-in is a significant risk.

Before You Fly

Regardless of airline or seat arrangement, a vet check before traveling is worth scheduling. It’s the right time to confirm your dog is healthy enough to fly, discuss any anxiety concerns, and make sure their carrier gives them enough room to stand, turn around, and lie down comfortably. Getting your dog comfortable with their carrier well before the travel date also makes a real difference, especially for dogs who have never flown.

Airline pet policies change more often than most people realize, so as mentioned, we recommend calling the airline directly to confirm the current policy before purchasing anything is always the right move, even if you’ve flown with them before.

Featured Image Credit: RyanTaylor, Shutterstock

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