Which Airlines Allow Medium-Sized Dogs? 2026 Guide

Which airlines allow medium-sized dogs?

Most major U.S. airlines only allow small pets in the cabin—typically those that fit comfortably in a ventilated, under‑seat carrier. For true medium-sized dogs (usually 20–50 lb, or those that won’t fit under the seat), options shift to checked/cargo pet programs or select carriers that permit larger dogs in the cabin on specific aircraft and routes.

Airlines that commonly allow pets in cabin (small only)

Alaska Airlines, American Airlines, Delta, JetBlue, Southwest, and United generally permit small pets in cabin within strict size/weight and carrier rules. If your “medium” dog can safely curl up in an airline-compliant soft carrier, you may qualify—always verify dimensions, weight limits, and breed restrictions before booking.

Options for medium-sized dogs that don’t fit under the seat

• Checked/cargo programs: Alaska Airlines and Hawaiian Airlines maintain well-defined pet travel programs for larger dogs on many routes (weather and seasonal embargoes apply). Air Canada also offers checked/cargo options on select flights. Policies, kennel sizes, health documentation, and temperatures are strictly regulated.
• Semi‑private carriers: JSX and similar regional/semi‑private airlines may allow larger dogs in cabin with advance approval and a paid seat or pet fee. Availability varies by route and aircraft.
• International carriers: Some non‑U.S. airlines permit heavier in‑cabin pets than typical U.S. limits. Check each carrier’s country-specific rules and import requirements well in advance.

How to choose the right airline

For a smoother trip, practice carrier time at home, pack a cozy pad, and keep essentials organized. See our carrier fit and comfort tips here: How to pick and use a comfy dog travel tote.

FAQ

What is the best airline to fly with a medium sized dog?

For dogs that don’t fit under the seat, Alaska Airlines and Hawaiian often have clear checked/cargo programs, while JSX may allow larger dogs in cabin on certain routes. The “best” choice depends on your route, weather, kennel dimensions, and your dog’s temperament.

Which airlines let you fly with large dogs?

Large dogs typically travel via checked/cargo on airlines like Alaska, Hawaiian, and Air Canada, subject to route and temperature limits. Semi‑private carriers such as JSX may allow larger in‑cabin pets with special arrangements.

How to get a medium size dog on a plane?

Measure your dog and choose the path: under‑seat in‑cabin if they fit a compliant soft carrier, or book a checked/cargo pet reservation with an approved hard kennel. Confirm veterinary documents, acclimate your dog to the carrier, and monitor weather and embargo dates.