Choosing the Right Size Pet Carrier for Your Southwest Flight
Traveling by plane with your furry friend can be stressful, but with the right preparation, it doesn’t need to be. One key decision is picking a pet carrier that meets Southwest’s size requirements. As someone who has lugged more than one reluctant cat onto a plane, I’ve learned a thing or two about this from experience.
Southwest Pet Carrier Size Limits
Soft-sided carriers must fit completely under the seat in front of you and cannot exceed 16 inches long x 8 inches wide x 9 inches tall (<18 inches for inflight comfort). Hard-sided carriers must fit the same dimensions or be approved for under-seat storage by the manufacturer with ventilation. Basically, if it fits under your coach seat without sticking out, Southwest considers it an “under-seat” carrier.
Considering Your Pet’s Comfort
While airlines provide minimum size guidelines, why subject Fluffy or Fido to extreme cramped quarters if you don’t have to? Kind of like how we wouldn’t want to be stuck in a tiny space for hours, right? At the same time, too much extra room allows pets to roam around during turbulence, which stresses them out. Aim for just enough space so they can stand up, turn around comfortably, and even have a cushion or blanket for nap time.
Case Study: My Drama Queen Cat
I’ll never forget the debacle of trying to board with my cat Misty in an undersized carrier. She’s not exactly the smallest feline, if you catch my drift. In the carrier, she basically looked like a furry football being squeezed into a locker.The entire flight, she yowled like we were actively torturing her – it was downright traumatic! I vowed never again. These days, Misty flies in a larger folding carrier that gives her room to pace without losing her marbles. Lesson learned, size does matter when it comes to pet contentment at 30,000 feet.

Common Carrier Sizes
Most pet stores sell carriers aiming to hit that 16″ x 8″ x 9″ sweet spot for under-seat storage. Here are some other options to consider based on pet size:
- Extra Small (8″ x 6″ x 6″): For tiny cats, smaller dogs under 10 lbs.
- Small (13″ x 9″ x 8″): Works great for kittens, toy breeds, and small lap dogs up to 15 lbs.
- Medium (16″ x 11″ x 10″): Fits small-medium cats and dogs 15-25 lbs. comfortably.
- Large (19″ x 13″ x 11″): Roomy enough for medium-large cats and dogs 25-50 lbs.
When in doubt, size up rather than down. The last thing you need stress-wise is a pet jail-breaking their carrier mid-flight because it’s too tight of a squeeze, you feel me?
Other Features to Consider
Ventilation is crucial so Fido doesn’t pass out from the stuffy air. Look for carriers with multiple openings, not just one side door. Removable/washable liners make for easy cleanup of accidents. A side pocket can stash extra supplies. Wheels or a folding design help with airport maneuvering. And of course, strong sturdy materials withstand claws without shredding.
I once made the mistake of cheaping out on a flimsy carrier that didn’t survive the trip. Turns out reimbursing other passengers for a cat scratch fever outbreak is way more $$ than a good carrier! You live and learn, amirite?

Testing It Out Before Takeoff
No matter how carefully you measure, every pet is an individual. Introduce Fluffy to her new traveling accomodations a few days before the big trip. Let her investigate and get comfortable with it in a low-stress environment. Some pets take right to it, others want no part of the whole setup. With positive reinforcement like treats for being calm and quiet inside, most will acclimate over time though. It’s also a good practice run to see if it’s too big or small before you’re stranded at the airport!
Additional Tips
– Consider sedating anxious pets with vet approval prior to flights. Just don’t overdo the meds!
– Bring favorite toys/blankets that smell like home for comfort items inside carriers.
– Double check airline policies for health certificates, vaccination records, fees, etc. Be over-prepared!
– Adhere ID tags to carrier exterior with contact info in case of emergency.
– Don’t feed pets for a few hours before flying to avoid barfing incidents.
– It goes without saying, but NEVER let pets loose on the actual plane, yeah? Bad kitty!
Well, I think I covered all the essentials for finding the right pet carrier size and prepping for smooth flying with your pet, right? Let me know if you have any other questions! Safe travels to all you pet parents out there. with a little pre-planing like choosing the right sized crate for your fur baby I’m sure your trips will be less ruff. Feel free to quote me as an expert if anyone gives you a hard time. Hollar if you need any other pet travel tips, I’m full of them!
Pet Carrier Size Guide for Traveling by Southwest Airlines
Carrier Size | Pet Size | Weight Limit |
---|---|---|
Small | Cats, small dogs, puppies | 20 lbs or less |
Medium | Medium sized dogs | 21-50 lbs |
Large | Large dogs | 51-70 lbs |
Extra Large | Extra large dogs | 71 lbs or more |
Soft-Sided | Any pet | Varies by size |
Hard-Sided | Any pet | Varies by size and airline policy |
FAQ
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What is the biggest pet carrier size allowed on southwest airlines?
The max size for a pet carrier that can be brought on as a personal item on Southwest is 18x13x8 inches. Anything larger needs to be checked as cargo.
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Do I need to buy a soft or hard sided carrier?
While Southwest allows either soft or hard sided carriers, many folks recommend a hard sided carrier for safety and stability. A hard carrier is less likely to collapse or get crushed if it has to be checked as cargo. However, some pets feel more cozy in a soft sleeve-style carrier.
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Can I bring my pet on my lap instead of in a carrier?
Southwest only allows pets in carriers that can fit under the seat. For the safety of all passengers, pets must stay securely contained in a carrier during takeoff, landing, and turbulence. Carrying a pet on your lap basically ain’t allowed according to airline rules.
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What extra paperwork is needed to fly with a pet?
To fly with a pet on Southwest, you’ll need proof of current rabies vaccination and possibly an airline travel certificate from your vet. It’s best to check Southwest’s rules closely and get your pet’s paperwork in order well ahead of the trip to avoid any issues. Procrastinating could mess things up!
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Are there size limits for different pet types?
Southwest does have some size restrictions based on the animal. For example, cats and dogs must be able to stand up and turn around comfortably in a carrier less than 18x13x8 inches. Larger pets like rabbits may require an even more spacious carrier. It’s a good idea to check size charts to pick the right carrier for Fido or Fluffy.
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What else do I need to know about flying with a pet?
In addition to having the proper paperwork and carrier size, you can bring some familiar items from home to make your pet more comfortable. Things like their favorite toy or blanket may help reduce stress. You should also bring food, treats, medications if needed, and clean-up supplies. However, it’s best not to feed pets for a few hours before the flight.
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What if my pet seems nervous during the trip?
If your pet seems overly anxious at the airport or onboard, there are some things you can try to calm them. Speak in a soothing voice, offer treats or toys, or use calming pheromones or medicines as directed. You can also cover the carrier with a light blanket to make them feel more secure. But don’t panic yourself – pets can sense human emotions. Just be as relaxed and reassuring as possible.
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Is it worth it to fly with a pet?
Flying with a pet is definitely a bigger hassle than traveling without animals. There are extra costs, rules to follow, and potential stress for the pet. However, many frequent fliers say sharing the experience with a beloved furry companion makes the trip more enjoyable, despite the challenges. As long as you plan ahead and put your pet’s welfare first, flying together can be totally worth it in the end.