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Airlines publish carrier limits in inches, and a carrier that clears one gate by half an inch can be turned away at the next. This guide sets out in-cabin dimensions for eight US airlines, what size dog can fly in the cabin, and how to choose a carrier before you book. |
You have the flight booked, the vaccination record in a folder, and a carrier on the closet floor that looked right until you opened the airline's pet page. Three small numbers decide whether that carrier flies, and they shift from one airline to the next.
In-Cabin Pet Carrier Size Limits by US Airline
|
Airline |
Max soft-sided (L x W x H, in) |
Max hard-sided (L x W x H, in) |
One-way fee |
Pets per cabin |
Notable restrictions |
|---|---|---|---|---|---|
|
American |
18 x 11 x 11 |
19 x 13 x 9 |
$150 |
20 on mainline |
No bulkhead or exit row; 20 lb combined on A321T only |
|
Delta |
18 x 11 x 11 |
Not specified |
$150 |
4 in main cabin |
No published weight limit |
|
United |
18 x 11 x 11 |
17.5 x 12 x 7.5 |
$150 |
Limited |
No bulkhead or exit row |
|
Southwest |
18.5 x 13.5 x 8.5 |
18.5 x 13.5 x 8.5 |
$125 |
Limited |
Two same-species pets per carrier |
|
JetBlue |
17 x 12.5 x 8.5 |
17 x 12.5 x 8.5 |
$125 |
Limited |
One pet per carrier |
|
Alaska |
17 x 11 x 9.5 |
Soft-sided only |
$100 |
Limited |
Soft-sided carrier required |
|
Frontier |
18 x 14 x 11 |
18 x 14 x 8 |
$149 |
One per passenger |
One adult pet per carrier |
|
Allegiant |
18 x 12 x 11 |
17 x 11 x 10.5 |
$50 per segment |
One carrier per traveler |
Lower 48 states only |
Airlines update pet policies and under-seat space varies by aircraft, so confirm requirements with the airline before booking.
American Airlines Pet Carrier Size
American allows soft-sided carriers up to 18 x 11 x 11 inches and hard-sided carriers up to 19 x 13 x 9 inches on mainline aircraft and 16 x 12 x 8 inches on American Eagle, for $150 each way.
Delta Pet Carrier Size
Delta pet carrier dimensions top out at 18 x 11 x 11 inches for a soft-sided carrier, with a $150 fee each way. The pet carrier size guidance and measurements are recommendations only, since the aircraft determines the real limit.
United Pet Carrier Size
United allows soft-sided carriers up to 18 x 11 x 11 inches and hard-sided carriers up to 17.5 x 12 x 7.5 inches. Bulkhead and exit rows are closed to pet travelers.
Southwest Pet Carrier Size
Southwest pet carrier dimensions cap at 18.5 x 13.5 x 8.5 inches, wide but short. Southwest Airlines allows two same-species pets per carrier for $125 each way.
JetBlue Pet Carrier Size
JetBlue allows carriers up to 17 x 12.5 x 8.5 inches, with one pet per carrier.
Alaska Airlines Pet Carrier Size
Alaska requires a soft-sided carrier no larger than 17 x 11 x 9.5 inches, for $100 each way.
Frontier Pet Carrier Size
Frontier allows soft-sided carriers up to 18 x 14 x 11 inches and hard-sided carriers up to 18 x 14 x 8 inches, for $149 each way. The pet must be able to stand, turn around, and lie down naturally.
Allegiant Pet Carrier Size
Allegiant allows soft-sided carriers up to 18 x 12 x 11 inches and hard-sided carriers up to 17 x 11 x 10.5 inches, and charges $50 per segment on flights within the lower 48 states.
How Strict Are Airlines With Pet Carrier Size?
Airlines check pet carrier dimensions at the counter and again at the gate. A soft-sided pet carrier for travel gets some tolerance because it compresses slightly, while a rigid carrier over the limit has no give.
What Size Pet Carrier Will Fit Under an Airline Seat?
Published limits tell only part of the story, because the seat in front of you sets the real boundary.
Under-Seat Space Varies by Aircraft, Not Just Airline
Under-seat pet carrier size varies by aircraft type, window, middle, and aisle seats, regional jets, and bulkhead rows, which offer no floor space. Check the aircraft on your booking.
The Dimensions That Work Across Most US Carriers
Most airline-approved pet carrier dimensions fall into two reference sizes: 18 x 11 x 11 inches and 17 x 11 x 9 inches.
FikaGO’s TRUFFLE PLUS (17 x 11 x 11 inches), rated up to 22 pounds, and TRUFFLE (17 x 11 x 9 inches), rated under 11 pounds, are examples of carriers built to these sizes respectively.
The TRUFFLE PLUS (17 x 11 x 11 inches) sits within the soft-sided limit at American, Delta, United, Frontier, and Allegiant. The TRUFFLE (17 x 11 x 9 inches) suits Alaska and compresses more easily under the 8.5 inch height caps at Southwest and JetBlue. A soft-sided carrier at these sizes is a dependable choice for a small dog, but any airline-approved pet travel carrier for under-seat use should undergo a fit check. Before you buy a pet carrier for your next trip, confirm it against your airline’s current requirements, since policies update.
What Size Dog Can Fly in the Cabin?
Airlines measure the carrier, and the dog only needs to fit comfortably inside. The airline dog carrier size limit sets the boundary.
Airline Weight Limits
Most airlines judge fit rather than weight. American applies a 20-pound limit for pet and carrier combined on its three-cabin A321T aircraft and weighs both at check-in, while Delta, Allegiant, and Frontier publish no weight limit. A carrier's rated capacity and an airline's limit are separate figures.
How to Measure Your Dog Before You Buy
Measure nose to tail base, then standing shoulder height. Two 20-pound dogs can need different carriers, because a long dachshund and a tall terrier need different interior shapes.
Can I Take My 25 Pound Dog on a Plane?
Most airlines publish no weight limit, so the test is fit: the dog must stand, turn around, and lie down in a carrier that slides fully under the seat. A 25-pound dog rarely passes that test, and American weighs the pet and carrier together at 20 pounds on its A321T aircraft. Call the airline for specifics.
Can You Bring a 70 lb Dog on a Plane?
No, a 70-pound dog cannot fly in the cabin. Cargo policies vary, and some airlines, including Frontier and Allegiant, carry no pets in the hold at all, so confirm directly with the airline.
Is There Such a Thing as a TSA-Approved Pet Carrier?
No. TSA screens pet carriers at the checkpoint, and the airline sets the size limit that determines whether you can fly with one. Labels such as TSA-approved pet carrier, TSA-compliant pet carrier, and airline-compliant pet carrier all describe a carrier sized to fit under the seat on your flight. TSA pet carrier dimensions come from the airline, and FikaGO’s full carrier guide covers the overlap.
How Much Does It Cost to Fly With a Dog?
In-cabin fees run from $50 per segment on Allegiant to $150 each way on American, Delta, and United. Per-segment charges multiply on connections. Bag rules differ too: Southwest counts the carrier as your personal item or carry-on, while American and Delta allow one carrier plus one additional item.
Can I Buy My Dog a Seat on a Plane?
Some airlines, such as JetBlue, allow an additional seat to be purchased for a pet traveling inside its carrier. The pet must remain inside the carrier, and the carrier must be stowed under the seat during taxi, takeoff, and landing. Check your airline’s policy before booking.
Getting Through TSA Security With a Dog
The empty carrier goes through the X-ray, and TSA advises removing the dog just before screening and carrying it, or walking it on a leash, through the metal detector. A harness matters more than a collar here, since a collar can slip off. Anxious dogs can request a private screening.
Before and During the Flight
Preparation shapes the day, so it helps to sort it by stage.
Booking
Confirm all pet travel requirements with the airline before booking. Pet spots are capped per cabin, so book early for peak holiday travel.
The 24 Hours Before
Weigh the dog inside the carrier, pack vaccination records, and let the dog rest in the carrier at home.
At the Airport
Arrive early for measurement and fees, since Allegiant requires check-in at least one hour before departure, and keep the dog in the carrier throughout the terminal.
Onboard
Stow the carrier fully under the seat before takeoff and keep the dog inside for the whole flight, as Delta requires.
Flying Internationally With a Dog In-Cabin
International routes add health certificates and higher fees, such as $200 each way on Delta. Confirm current size, weight, and fee rules with your airline before booking, so the trip goes smoothly.
If you are ready to explore, FikaGO's airline-approved pet carriers, pet strollers and pet wagons are built for real city life and sized for pets of all kinds.
Frequently Asked Questions About Flying With a Dog In-Cabin
Does my dog need a health certificate to fly?
Domestic in-cabin flights usually don't require one, though some airlines and states may require it. International travel almost always requires it.
Can I take my dog out of the carrier during the flight?
No. According to Delta, the dog stays inside from the terminal through landing, except at the security checkpoint and in designated relief areas.
Do all airlines allow dogs in the cabin?
Every airline in this guide allows dogs in the cabin on domestic flights when size and fee rules are met, though some routes, such as Hawaii, exclude pets.
Can cats fly under the same carrier rules?
Yes. Cats follow the same dimensions, fees, and under-seat rules, and airlines such as Allegiant accept domestic dogs and cats alike.
What happens if my carrier is too big at the gate?
The agent can refuse to board the pet until the carrier complies, so measuring at home helps avoid the problem.