Traveling with a beloved pet can be a joyous experience, but navigating airline regulations can feel like a complex journey in itself. If you’re planning to fly Southwest Airlines with your furry companion, understanding their specific pet carrier requirements is crucial for a smooth and stress-free trip for both of you. This comprehensive guide will walk you through Southwest’s pet policy, help you choose the ideal carrier, and offer practical advice to ensure your pet’s comfort and safety from check-in to touchdown.
Understanding Southwest Airlines Pet Carrier Requirements
Southwest Airlines allows small, vaccinated domestic cats and dogs to travel in the aircraft cabin on domestic flights, provided they meet strict guidelines. Unlike some other airlines, Southwest does not transport pets in cargo, making in-cabin travel the only option for your four-legged friend. Therefore, selecting an approved pet carrier that adheres to their specific rules is your first and most important step.
Key Dimensions and Design
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Our Picks for the Best Pet Carrier in 2026
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| Num | Product | Action |
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| 1 | Lekereise Cat Backpack Carriers, Dog Carrier Backpacks with Breathable Mesh for Small Medium Cats Dogs Puppy Up to 17 Lbs, Pet Foldable Carrying Backpack Ventilated for Travel Hiking Collapsible |
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| 2 | Amazon Basics 2-Door Top-Load Hard-Sided Dogs, Cats Pet Travel Carrier, Gray & Blue, 22.8"L x 15.0"W x 13.0"H |
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| 3 | Texsens Innovative Traveler Bubble Backpack Pet Carriers for Cats and Dogs (Black) |
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| 4 | Henkelion Cat Carriers Dog Carrier Pet Carrier For Small / Medium Cats Dogs Puppies (Up To 15lbs), TSA Airline Approved Small Dog Carrier Soft Sided, Collapsible Waterproof Travel Puppy Carrier - Grey |
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| 5 | Pet Carrier for Large Cats, Soft-Sided Cat Carrier for Medium Big Cats and Puppy up to 20lbs, Washable Dog Carrier Privacy Protection for Home Outdoor Travel |
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| 6 | Cat Carrying Case Pet Dog Carrier Soft-Sided Cat Bag Airline Approved, Pet Travel Carrier Up to 15 Lbs, Collapsible Cats Carrier Dog Carrier for Medium Small Cats Dogs(17x11x11 Green) |
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| 7 | Top and 2 Sides Expandable Large Cat Carrier 18x13.5x9.5, TSA Airline Approved Dog Carriers for Large Dogs, Soft-Sided Pet Carrier with Self-Locking Zippers for Kitten,Rabbit,Puppy, Black White |
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| 8 | Henkelion Cat Carriers Dog Carrier Pet Carrier for Small / Medium Cats Dogs Puppies (Up To 15lbs), TSA Airline Approved Small Dog Carrier Soft Sided, Collapsible Waterproof Travel Puppy Carrier -Black |
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| 9 | Morpilot Cat Carrier - Cat Carrier Soft for Medium or Large Cats up to 20lbs, with Dual-Sided Cushion, Secure Buckle and Foldable Bowl, Dog Carriers for Small Dogs - Pet Carrier (Dark Gray) |
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| 10 | Dog Sling Carrier, Puppy Carrier Purse with Storage Pocket, Hand-Free Dog Carrier Sling for Carry Small Dogs and Cats, Puppy Essentials (Purple) |
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The most critical factor for any Southwest Pet Carrier is its dimensions. The carrier must fit comfortably under the seat in front of you. Southwest specifies a maximum size: 18.5 inches (length) x 13.5 inches (width) x 8.5 inches (height). Both soft-sided and hard-sided carriers are permitted, but soft-sided options are generally recommended due to their flexibility, which can make them easier to fit into the under-seat space, especially if it’s a tight squeeze. The carrier must also be leak-proof and provide adequate ventilation to ensure your pet’s well-being throughout the journey.
Pet Comfort and Safety
Beyond the physical dimensions, Southwest’s policy emphasizes your pet’s comfort. Your cat or dog must be able to stand up, turn around, and lie down in a natural position inside the carrier without touching the top or sides. The carrier must be secure, preventing any escapes. During your time in the gate area, through boarding and deplaning, and for the entire duration of the flight, your pet must remain fully enclosed within their carrier. This rule is strictly enforced for the safety and comfort of all passengers and crew.
Booking Your Pet’s Travel
Flying with a pet on Southwest Airlines requires advance planning. There is a $125 one-way fee per pet carrier for domestic flights within the continental U.S. If you’re traveling between Hawaiian islands, the fee is $35 each way. It’s important to note that Southwest limits the number of pet carriers to six per flight, on a first-come, first-served basis. Therefore, making a reservation for your pet by calling Southwest directly as soon as your travel plans are confirmed is highly recommended. The pet fare must be paid at the airport ticket counter on the day of travel using a credit card.
Eligibility and In-Flight Restrictions
Southwest welcomes small, vaccinated domestic cats and dogs that are at least eight weeks old. Each ticketed passenger is allowed to bring one pet carrier, which can hold up to two small cats or dogs of the same species, provided they can comfortably share the space. Pets are not permitted on international flights or flights to or from Hawaii (with the exception of inter-island travel). For your safety and the safety of your pet, passengers traveling with a pet are not permitted to sit in exit rows or bulkhead seats, as these locations do not provide sufficient under-seat storage. Any pet exhibiting disruptive behavior, such as excessive barking, growling, biting, or scratching, may be denied boarding. The pet carrier also counts as either your personal item or your carry-on bag, so plan your luggage accordingly.
Types of Pet Carriers for Southwest Flights
Choosing the right type of pet carrier is pivotal for a successful trip. Each type offers distinct advantages and disadvantages, especially when considering airline requirements and your pet’s needs.
Soft-Sided Pet Carriers
Soft-sided carriers are the most popular choice for in-cabin airline travel, and for good reason.
- Pros: Their flexible structure allows them to be slightly compressed to fit under various airplane seats, often accommodating pets that might be a snug fit in a rigid carrier. They are typically lightweight and come with features like multiple mesh windows for ventilation, soft interior padding, and shoulder straps for easy carrying.
- Cons: While flexible, they offer less rigid protection than hard-sided carriers. You must ensure the material is durable enough to prevent tears or escapes.
- Suitability: Ideal for small to medium-sized cats and dogs who are comfortable in enclosed spaces and for owners who prioritize ease of fitting under the seat.
Hard-Sided Pet Carriers
While less common for in-cabin travel due to their rigidity, hard-sided carriers can be used if they strictly meet the dimensions.
- Pros: They offer superior protection and ventilation, maintaining their shape throughout the journey. They are generally easier to clean.
- Cons: Their lack of flexibility can make it challenging to fit them under airplane seats, even if their dimensions are technically compliant. They can also be bulkier and heavier to carry through the airport.
- Suitability: Best for very small pets that fit precisely within Southwest’s maximum dimensions, ensuring no part of the carrier needs to be forced.
Backpack Pet Carriers
For very small and calm pets, a backpack-style carrier can offer hands-free convenience, particularly when navigating busy airports.
- Pros: They free up your hands, making it easier to manage other luggage or travel documents. Many feature good ventilation and comfortable shoulder straps.
- Cons: It can be harder to monitor your pet when they are on your back. Not all backpack carriers are designed to collapse or fit neatly under an airline seat, and some may lack the structural integrity to prevent your pet from being squished if the bag is overloaded or positioned improperly.
- Suitability: Recommended for exceptionally small, well-behaved pets who are accustomed to being in a backpack and for short trips where hands-free convenience is a priority. Always double-check that the backpack’s dimensions and flexibility will allow it to fit under the seat.
How to Choose the Best Southwest Pet Carrier
Selecting the perfect carrier goes beyond just meeting airline rules; it’s about ensuring your pet’s comfort and safety.
Measure Your Pet Accurately
Before even looking at carriers, measure your pet while they are standing naturally. Note their length (from nose to base of tail), height (from top of head to floor), and width. Add a few inches to these measurements to find a carrier that allows them to stand, turn around, and lie down comfortably without being cramped. Remember, the carrier’s external dimensions must not exceed Southwest’s 18.5″ L x 13.5″ W x 8.5″ H limit.
Prioritize Soft-Sided Carriers
For maximum flexibility and ease of fitting under the seat, a soft-sided carrier is almost always the best choice for Southwest flights. Look for models made with sturdy, tear-resistant fabric and a solid, yet flexible, frame.
Check for Essential Features
- Ventilation: Multiple mesh windows are crucial for airflow and for your pet to see their surroundings, reducing anxiety.
- Security: Ensure zippers are robust and can be secured, possibly with an extra clip or lock, to prevent accidental openings or escapes.
- Comfort: A removable, washable fleece pad or soft bedding inside the carrier will make the journey more comfortable.
- Handles and Straps: Look for strong carrying handles and a comfortable, adjustable shoulder strap.
- Storage: Some carriers offer small pockets for treats, waste bags, or important documents.
Read Reviews and Recommendations
Before purchasing, consult reviews from other pet owners who have flown with Southwest Airlines. Their real-world experiences can offer valuable insights into which carriers truly fit under the seats and how specific brands hold up during travel. While I cannot recommend specific product names, some reputable brands known for airline-compliant carriers often feature models that fit Southwest’s specifications.
Top Tips for a Smooth Flight with Your Pet
Even with the perfect carrier, a little extra preparation can make a big difference for your pet’s travel experience.
- Acclimate Your Pet: Introduce your pet to their carrier well in advance of the trip. Let them explore it, sleep in it, and associate it with positive experiences.
- Pre-Flight Prep: Ensure your pet has had plenty of exercise and a final potty break just before heading to the airport. Avoid overfeeding them right before the flight.
- Pack Essentials: Bring a small bag with treats, a familiar toy, a portable water bowl, and any necessary medications.
- Stay Calm: Pets often pick up on their owners’ emotions. Maintaining a calm demeanor can help keep your pet relaxed.
- Window Seat Advantage: Many experienced pet travelers suggest booking a window seat if possible, as it can sometimes offer a slightly less disturbed space for your pet’s carrier under the seat and away from aisle traffic.
Conclusion
Traveling with your pet on Southwest Airlines can be a rewarding experience, connecting you and your companion to new adventures. By meticulously selecting a pet carrier that adheres to Southwest’s specific dimensions and comfort requirements, making timely reservations, and preparing your pet for the journey, you set the stage for a safe and enjoyable trip. Always prioritize your pet’s well-being and double-check the latest airline policies before you fly. With the right planning, your furry friend can be a happy co-pilot on your next Southwest adventure.
What’s your ultimate secret for stress-free pet travel?
Frequently Asked Questions
What is Southwest’s pet carrier size limit?
Southwest Airlines requires pet carriers to have maximum dimensions of 18.5 inches in length, 13.5 inches in width, and 8.5 inches in height to ensure they fit under the seat in front of you.
Can my dog sit on my lap on Southwest?
No, for safety reasons, your dog or cat must remain secured inside its pet carrier and stowed under the seat in front of you for the entire duration of the flight, including during boarding and deplaning.
Is there a weight limit for pets on Southwest?
Southwest Airlines does not specify a weight limit for pets. Instead, the primary restriction is that your pet must fit comfortably within the approved carrier dimensions, able to stand, turn around, and lie down naturally.
How much does it cost to fly with a pet on Southwest?
The fee for traveling with a pet on Southwest Airlines is $125 one-way per pet carrier for domestic flights within the continental U.S. For inter-island flights in Hawaii, the fee is $35 each way.
Are emotional support animals free on Southwest?
No, as of current policies, emotional support animals are treated as pets and are subject to the standard $125 pet fee on Southwest Airlines. Only fully trained service animals, with proper documentation, are exempt from pet fees.
