What size dog can fly on Southwest?

Small dogs that can fit in a pet carrier measuring 18.5 inches long x 8.5 inches high x 13.5 inches wide can fly on Southwest Airlines. The dog needs to be small enough to be able to stand and move around in the carrier.



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On by-the-seat flights, pets under 25 pounds can sit in a carrier on their owner's lap for a pet fee of $95. For dogs heavier than 25 pounds, the owner must purchase an additional seat. There is a maximum of two pets per passenger.

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What species and size of pets are allowed? We welcome small, vaccinated domestic cats and dogs in an appropriate pet carrier (see below for pet carrier details) in the cabin on domestic flights. Carriers must be stowed under your seat. For Customers traveling to Puerto Rico, specific requirements may apply.

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Your pet carrier must be able to fit under the seat in front of you. The cat or dog must be completely inside the pet carrier and be able to stand up and move around the carrier with ease. Pet carrier requirements: Southwest Airlines® Pet Carrier - dimensions: 17” (L) x 10” (W) x 9.5” (H).

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Usually dogs are only allowed to fly in the cabin—known as carry-on pets—if they can comfortably fit in a carrier that you can stow under the seat in front of you. A small number of airlines, including JetBlue, Alaska Airlines, and Etihad Airways, allow passengers flying with dogs to buy an extra seat for their pet.

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An animal no larger than a child under the age of two may sit on your lap, otherwise it must be positioned on the plane floor.

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Southwest Airlines Pet Fees To make a reservation for your pet on Southwest Airlines, call 800-I-FLY-SWA (800-435-9792). Bottom Line: Each pet carrier brought on to a Southwest Airlines flight can contain up to 2 dogs or 2 cats. There is a $95 fee each way per pet carrier.

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U.S. Domestic Flights: Reservations must be made in advance by calling 1-800-I-FLY-SWA (1-800-435-9792). On the day of travel, Customers must bring the pet to the airport in an approved pet carrier. Proceed to the airport ticket counter to check the pet in and pay the Pet Fare before going to the departure gate.

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U.S. Domestic Flights: Reservations must be made in advance by calling 1-800-I-FLY-SWA (1-800-435-9792). On the day of travel, Customers must bring the pet to the airport in an approved pet carrier. Proceed to the airport ticket counter to check the pet in and pay the Pet Fare before going to the departure gate.

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If you're considering flying with a dog If you want more space, some airlines let you buy an extra seat that you might be able to use to place your pet's carrier on during the flight. However, your pet generally needs to stay in its carrier the whole trip.

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Yes, you can fly with large dogs so long as they are properly crated and prepared to fly. Many airlines require your pet to be at least 8-weeks old before flying. Any younger and dogs are thought to be too fragile for long flights. Your pet must also be free of fleas, ticks, and or infectious diseases.

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A 40-pound dog is indeed too large to travel in-cabin on most (if not all) airlines and will have to ride as cargo.

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Small dog breeds can be brought into the cabin provided they're inside their crate and are crate trained. Typically, they need to weigh 20 lbs. or less, following the airline's carry-on luggage weight restriction. If you have a large dog, you can still take them on the plane but not in the cabin.

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The whole process of flying can be stressful for a dog, but those levels of stress can be greatly reduced with a few simple home comforts and reassurances. Ensuring your flight is a non-stop flight rather than one with changeovers can be a huge benefit to your dog, as can looking to travel at a suitable time.

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When checking a pet, you need to:
  1. Contact Reservations at least 48 hours prior to travel.
  2. Check in at the ticket counter with your official orders.
  3. Allow extra check-in time (at least 2 hours and no more than 4 hours before your flight)
  4. Complete a checklist with an agent.
  5. Provide a health certificate.


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If you find a dog, cat or turkey next to you on your next flight, it probably has a right to be there. If sitting so close doesn't work for you, let the flight attendants know—they will try to help.

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Window and Middle seats usually have wider space underneath the seat in front of you between their supports. Underneath the aisle seat is typically more narrow. If it were me I would recommend the window seat that way no one will jostle the dog if they get up to use the restroom during the flight.

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They must be able to fit in a small, ventilated pet carrier that fits under the seat in front of you. One pet is permitted per kennel with the following exceptions: One female cat/dog may travel with her un-weaned litter if the litter is between 10 weeks to 6 months of age.

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In general, if your pet carrier (with your pet inside) can fit under the seat in front of you, your dog can ride in the cabin on flights that permit it. Typically, this would be a dog weighing up to about 20 pounds.

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If you have a large dog, you can still take them on the plane but not in the cabin. Depending on how large your dog is, they could travel as checked baggage or as cargo. The first option means your dog is on the same flight but crated and placed in the cargo hold beneath the plane.

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