Dog Weight Limits for Flying in Cabin: Airline-by-Airline Guide

That difference matters. A compact 18 lb dog may fit nicely in a soft-sided carrier. A taller 15 lb dog may not. And on airlines with a combined weight limit, the carrier counts too.

In this guide, we’ll break down the dog weight limit for cabin flights by airline, explain what actually happens at check-in, and help you figure out whether your dog is realistically small enough to fly under the seat.

Is there a standard dog weight limit for in-cabin flights?

There is no universal weight for dogs flying in the cabin. Each airline sets its own rules. Some airlines use a strict combined weight limit for your dog and carrier. Other airlines focus entirely on carrier size and whether your dog can stand, turn around, and lie down comfortably inside the carrier. That means you should not assume that “under 20 pounds” automatically means your dog can fly in the cabin.

For most airlines the real test is:

• Can your dog fit fully inside the carrier?
• Can the carrier fit under the seat in front of you?
• Can your dog stay inside the zipped carrier for the entire flight?
• Does the dog and carrier stay under the airline’s weight limit, if one exists?

If your dog is close to the limit, the carrier test matters just as much as the number on the scale.

Airline pet policies can change, and aircraft layouts vary. Always confirm your dog’s eligibility directly with the airline before booking.

Dog weight limits for cabin flights by airline

The table above gives you the quick version, but the details matter. Some airlines are strict about the total weight of your dog and carrier. Others are more concerned with whether your dog fits properly under the seat.

Here is how the major airlines compare.

Air Canada dog weight limit for cabin flights

Air Canada’s dog in-cabin pet policy is not built around one simple weight limit. Rather, Air Canada says your small dog must be kept in a flexible, soft-sided carrier under the seat in front of you. Your pet must be small enough to stand, turn around, and lie down inside the carrier.

That means Air Canada is more of a carrier-fit airline than a strict weight-limit airline.

This is important because a dog’s shape often matters more than the number on the scale. A compact dog is easier to fly with than a taller dog that weighs less but cannot comfortably settle inside the carrier.

Air Canada requires you to contact reservations after booking your flight to register your pet. When you call, they will confirm your carrier dimensions and your pet’s weight and breed. Pets that are not registered in advance may not be accepted at the airport. This means you should not just show up at check-in and hope it works.

If you are deciding whether your dog should travel under the seat or another way, read our full guide to Cabin vs Cargo.

You can also compare the full airline-specific rules in our guide to Flying with a Dog on Air Canada.

Alaska Airlines dog weight limit for cabin flights

Alaska Airlines is also more focused on carrier fit than a single published dog weight limit. Small dogs can travel in the cabin if they fit in an approved pet carrier. Alaska also limits cabin pet space, so availability matters. This makes Alaska one of the better airlines to compare if your dog is small enough for the cabin but does not fit into a strict weight-limit category.

That does not mean larger small dogs automatically get approved. Your dog still needs to fit inside the carrier in a safe and reasonable way. If your dog is pressed against the top, cannot turn around, or clearly looks too large for the carrier, you will probably run into problems.

The biggest mistake people make with Alaska is assuming no hard weight limit means any dog that fits under the seat is fine. The airline still has to accept the carrier. The dog needs to remain fully inside the carrier. And the seat in front of you has to have enough space under it for the carrier.

If your dog is near the upper end of cabin size, call Alaska before booking and confirm the aircraft, carrier dimensions, and pet availability.

For a deeper breakdown, read our full guide to Flying with a Dog on Alaska Airlines.

Avianca dog weight limit for cabin flights

Avianca is much clearer than many airlines because it publishes a specific cabin weight limit. Dogs and cats may travel in the cabin only if they weigh no more than 10 kg / 22 lb including the carrier. Avianca also has specific carrier requirements. The carrier must be soft-sided, fit under the seat, and allow your dog to stand, turn around, and move naturally. Avianca’s help page also lists a maximum carrier size of 22 × 14 × 10 in / 56 × 36 × 25 cm.

Avianca can be useful for dog travel in Latin America, especially if you are connecting through Colombia or flying within the region.

For more details, read our full guide to Flying with a Dog on Avianca.

American Airlines dog weight limit for cabin flights

American Airlines has one of the clearest cabin pet weight rules. The total weight of your pet and carrier must not exceed 20 lb / 9.07 kg, and American says they will weigh them at check-in. This is stricter than some travelers expect, and it is a total combined weight of dog and carrier.

American is not the airline where I would try to “sneak by” with a borderline dog. American can work well for very small dogs, but if your dog is close to 20 lb before the carrier, you should probably compare other airlines.

Delta dog weight limit for cabin flights

Delta does not publish a simple cabin dog weight limit in the same way American or Avianca does. Your dog must be small enough to fit comfortably in a kennel, with the ability to move around without touching or sticking out from the sides. The kennel must fit fully underneath the seat in front of you.

This makes Delta a carrier-fit airline. Delta’s under-seat space can vary by aircraft, so the carrier dimensions are important. A carrier that works on one aircraft may not work as well on another. If your dog is close to cabin size limits, call Delta before booking and ask what carrier dimensions apply to your specific flight.

United Airlines dog weight limits for cabin flights

United is one of the most flexible major U.S. airlines when it comes to cabin pet weight rules. There are no weight or breed limitations for dogs, but your pet must travel in a hard-sided or soft-sided carrier that fits under the seat.

United can be useful for small dogs that are slightly heavier but compact. But your dog still needs to stay inside the carrier for the entire flight.

Southwest dog weight limit for cabin flights

Southwest’s pet policy does not revolve around cabin weight limits. Southwest allows small vaccinated cats and dogs to travel in-cabin in an approved carrier. Each customer may bring one pet carrier, and the carrier can contain no more than two small cats or dogs of the same species.

Southwest also says pets must remain secured in their carrier at the gate, during boarding and deplaning, and for the entire flight. It can be a good domestic option for small dogs, but it is not a solution for medium-sized dogs.

JetBlue dog weight limit for cabin flights

JetBlue is commonly known for having a combined pet-and-carrier cabin weight limit of 20 lb. Its current pet travel pages emphasize that only small dogs and cats may travel, and that the pet and approved carrier must fit under the seat in front of you. For practical purposes, JetBlue is best for very small dogs.

If your dog weighs 18–20 lb before the carrier, I would not rely on JetBlue unless you confirm the current rule directly before booking.

Frontier dog weight limit for cabin flights

Frontier does not publish a simple dog weight limit for cabin travel. Instead, Frontier focuses on the carrier. The travel container must be large enough for your pet to stand, turn around, and lie down naturally, and it must fit under the seat in front of you. Frontier lists maximum hard-sided carrier dimensions of 18 × 14 × 8 in.

Frontier also allows pets in the cabin on domestic flights and says pets travel in the cabin only, not as checked pets. If your dog is too big for the cabin, Frontier is not usually the airline where you can simply switch to checked pet travel.

Lufthansa dog weight limit for cabin travel

Lufthansa has a strict cabin weight limit. Small dogs may travel in the cabin only if they weigh a maximum of 8 kg / 17.6 lb including the carrier. That is a lower limit than many North American travelers expect. Lufthansa is not a great fit for dogs near 20 lb.

If your dog and carrier together exceed 8 kg, Lufthansa says dogs over that combined limit may need to travel in the aircraft’s air-conditioned cargo hold, where permitted.

KLM dog weight limit for cabin travel

KLM also uses an 8 kg / 17.6 lb combined limit for dogs in the cabin. Your pet must also fit in a closed travel bag or kennel under the seat in front of you. This makes KLM similar to Lufthansa and Air France. If your dog weighs 16–17 lb without the carrier, you are probably already too close to the limit.

Air France dog weight limit for cabin travel

Air France states that if your dog or cat weighs more than 8 kg / 17.64 lb with its carrier, it must travel in the hold, where allowed. Like KLM and Lufthansa, Air France is best for smaller dogs. If your dog is near 20 lb, Air France is probably not the right in-cabin option.

Why the carrier matters more than the scale

The biggest mistake people make is only asking, “How much can my dog weigh to fly in the cabin?”

A better question is:

Can my dog fit comfortably inside the airline-approved carrier for the entire flight?

Your dog does not get their own seat.

They do not sit on your lap.

They do not stretch out in the aisle.

For regular in-cabin pet travel, your dog stays inside the carrier under the seat in front of you.

That means a dog’s height, length, and body shape matter just as much as weight.

A compact 19 lb dog may fit better than a long-legged 14 lb dog. A tall dog may hit the top of the carrier even if they are technically under the airline’s weight limit.

Before booking, test the carrier at home.

Put your dog inside.

Zip it fully closed.

Make sure your dog can turn around.

Make sure your dog can lie down naturally.

Then leave them in it for a short practice session.

If your dog cannot settle in the carrier at home, the airport will not magically make it easier.

How to know if your dog is too big for cabin travel

Your dog may be too big to fly in the cabin if they cannot turn around inside the carrier, cannot lie down naturally, or are pressed tightly against the top or sides. Your dog may also be too big if the carrier that fits them is larger than what the airline allows under the seat.

You are not just trying to fit your dog into any carrier. You are trying to fit your dog into a carrier that fits under an airplane seat. If your dog is too large for cabin travel, your options depend on the airline and route. Some airlines allow pets in the hold or cargo. Others only allow in-cabin pets.

This is where it helps to compare Cabin vs Cargo before booking.

Tips for flying with a dog close to the cabin weight limit

Weigh your dog and carrier together before booking. Do not guess. A carrier can easily add 2–4 lb, which matters on airlines with a combined limit.

Choose the lightest airline-approved carrier that still gives your dog enough space. Do not buy a carrier just because it is small enough for the airline if your dog cannot move naturally inside it.

Practice at home before the flight. Your dog should be comfortable being zipped inside, carried, placed under a table, and left there quietly for short periods.

Book your pet reservation early. Many airlines limit the number of pets allowed in the cabin. Being under the weight limit does not guarantee space on the flight.

If your dog is borderline, call before you book. Ask about the aircraft, carrier dimensions, pet weight limit, and whether the carrier counts toward the total.

Frequently asked questions