Can I bring my ESA on Southwest for free using an ESA letter in 2026?
No. Southwest does not accept ESA letters for fee waivers or special accommodations. ESAs travel as standard in-cabin pets for $125 each way if they meet carrier size requirements.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical or legal advice. Consult a qualified mental health professional before making decisions about your care. If you or someone you know is in crisis, call or text 988 (Suicide & Crisis Lifeline, available 24/7).
Southwest Airlines has one of the simpler pet policies among major U.S. carriers - but several features are unique and important to understand before booking. This guide covers Southwest's 2026 in-cabin pet policy, fees, ESA rules, and important limitations.
Southwest Airlines In-Cabin Pet Policy 2026
Southwest allows small cats and dogs to travel in the cabin on domestic flights:
- Fee: $125 per pet, per one-way flight
- Carrier size: Soft-sided carrier must fit under the seat in front (max 18.5" × 8.5" × 13.5")
- Eligible animals: Cats and dogs only (no birds, rabbits, or other animals)
- Per flight limit: Maximum 6 pets per flight total
- Booking: Pet reservations are first-come, first-served - add during booking
Key Southwest Limitation: No Cargo Pet Shipping
Southwest does not offer a cargo pet shipping program. If your pet does not meet in-cabin requirements, there is no Southwest cargo option - you would need to book with a different airline or use a dedicated pet transport service.
Southwest Airlines ESA Policy 2026
Southwest no longer accepts ESAs as a special accommodation category, in line with the 2021 DOT rule change. ESA letters are not accepted to waive the $125 pet fee or bypass carrier requirements on Southwest.
ESA owners must choose:
- Travel with their ESA as a standard in-cabin pet for $125 (if within size requirements)
- Consider a different airline if their ESA needs cargo shipping
- Use a PSD designation if the animal performs qualifying ADA psychiatric tasks
Psychiatric Service Dogs on Southwest
Southwest accepts trained service dogs, including psychiatric service dogs, in the cabin at no charge. They accept the DOT Service Animal Air Transportation Form and require notification (ideally 48 hours in advance). PSDs must perform specific, individually trained disability-mitigating tasks - not merely provide comfort.
Southwest vs. Other Airlines: Pet Travel Comparison
Southwest's $125 in-cabin fee is mid-range compared to other major carriers (American charges $150; Delta and United charge $95–$125). The key Southwest difference is the absence of cargo shipping - making it less suitable for owners with larger pets who cannot travel in-cabin.
Frequently Asked Questions
Can I bring my ESA on Southwest for free using an ESA letter in 2026?
No. Southwest does not accept ESA letters for fee waivers or special accommodations. ESAs travel as standard in-cabin pets for $125 each way if they meet carrier size requirements.
Does Southwest have a cargo pet program if my pet is too large for the cabin?
No. Southwest does not offer cargo pet shipping. If your pet exceeds in-cabin requirements, Southwest is not a viable option - you would need to use a carrier with cargo pet programs (Delta, United, or American) or a dedicated pet transport service.
How do I reserve a spot for my pet on Southwest?
Add your pet during the booking process on Southwest's website. Southwest limits pets to 6 per flight total, on a first-come basis, so book as early as possible to guarantee a spot.
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