Airline Pet Policies: Fees, Carrier Sizes, and Rules for Every Major U.S. Carrier (2026)

Flying with your dog or cat doesn't have to be stressful — but it does require homework. Every airline has its own fees, carrier dimensions, and fine-print rules that can trip you up at the gate.

Here's every major U.S. carrier's pet policy in one place so you can compare side by side.

The Quick Version

Most major U.S. airlines allow small dogs and cats in the cabin for $95 to $150 each way. Your pet must stay in an airline-approved carrier under the seat in front of you for the entire flight. No exceptions, no lap time.

The cheapest options: Frontier at $99 each way and Alaska at $100. The priciest: American, Delta, United, and JetBlue at $150. Hawaiian Airlines charges just $35 between islands — the best deal in U.S. aviation.

Airline Pet Policy Comparison Table (2026)

Fees and policies current as of May 2026. Always confirm directly with your airline before booking.

Airline-by-Airline Breakdown

The table gives you the headline numbers. Here's what actually matters when choosing an airline.

Alaska Airlines — Best Overall for Pet Travel

Alaska consistently ranks as the most pet-friendly major U.S. carrier. At $100 each way, it's among the cheapest full-service options. They accept dogs, cats, and rabbits, and they're one of the few airlines still offering cargo transport for larger animals (up to 150 lbs with the kennel).

Alaska allows two pets of the same species in one carrier — great for bonded pairs. They cap cabin pets at 8 in main cabin and 3 in first class, so book early. The downside: you can't book pet travel online. Call or use chat well in advance.

Delta Air Lines — Premium but Restrictive

Delta charges $150 domestic and $200 international. They accept dogs, cats, and household birds, which is broader than most legacy carriers. But Delta discontinued its cargo pet program entirely — if your pet doesn't fit under the seat, Delta is out.

The airline caps cabin pets at four per main cabin section, so availability is genuinely limited on popular routes. Credit where it's due: Delta has strong temperature embargo policies, refusing to transport pets when ground temps exceed 85°F or drop below 20°F.

American Airlines — Generous Carriers, Limited Cargo

American charges $150 each way for dogs and cats only. Their carrier size allowance is among the most generous — 18" x 11" x 11" for soft-sided, 19" x 13" x 9" for hard-sided. Cargo transport exists but is restricted to active-duty military and State Department personnel.

Southwest Airlines — Simple and Domestic

Southwest charges $125 each way. Dogs and cats only, domestic flights only. The carrier size limit of 18.5" x 13.5" x 9.5" is the most generous in the industry. They cap pet carriers at six per flight, and you can't reserve a spot at booking — you add it at check-in.

Frontier Airlines — Budget Pick

At $99 each way, Frontier is the cheapest mainstream option. They also accept the widest variety of animals: dogs, cats, rabbits, guinea pigs, hamsters, and small household birds. If you're traveling with anything other than a dog or cat, Frontier is likely your only choice.

Hawaiian Airlines — Best for Island Hopping

Hawaiian's $35 interisland fee is unbeatable, and their $100 mainland rate (updated January 2026) is competitive. They're one of the few carriers offering checked baggage pet transport ($60 to $225). The catch: no pets on international routes, and Hawaii's quarantine laws add complexity.

Pet Fees Add Up — Here's How to Offset Them

A round-trip with your pet adds $190 to $300 to your travel costs. That's real money on top of your ticket price.

One way to offset it: use Autopilot to track your fare after booking. If the price drops, you get the difference back — which can cover part or all of that pet fee.

International Pet Travel

Domestic pet travel is relatively straightforward. International is a different animal.

Most countries require a USDA-endorsed health certificate (APHIS Form 7001) from a federally accredited veterinarian within 10 days of departure. Beyond that, requirements vary wildly:

• European Union: Microchip, rabies vaccination, EU health certificate. Some countries require titer tests months in advance.
• United Kingdom: No quarantine if requirements are met, but most U.S. airlines don't allow in-cabin pets on UK flights.
• Australia/New Zealand: Minimum 10-day quarantine, extensive pre-travel testing, months of preparation.
• Hawaii: Despite being a U.S. state, Hawaii has its own rabies quarantine. Pets can qualify for direct release with two rabies vaccinations, microchip, and a titer test at least 120 days before arrival.

Start international paperwork three to six months before your trip. This is not a last-minute task.

Emotional Support Animals vs. Service Animals

Emotional support animals no longer receive special treatment on U.S. airlines. Since the DOT updated its rules in 2021, every major carrier treats ESAs as standard pets — same fees, same carrier requirements. Your ESA letter carries no weight at the airport.

Service animals are different. A trained service dog flies free under DOT rules, but airlines require federal forms — the "Service Animal Air Transportation Form" and "Service Animal Relief Attestation" — submitted at least 48 hours before departure. Only dogs qualify as service animals on airlines.

Psychiatric service dogs also fly free under DOT rules, but airlines may request additional documentation. The key distinction: service dogs are trained to perform specific tasks. ESAs provide comfort through presence alone — and that distinction now costs you $95 to $150 each way.

Tips for Flying With Your Pet

• Book direct flights. Fewer connections mean less stress for your pet and fewer segments to pay pet fees on.
• Call ahead to reserve your pet spot. Most carriers limit cabin pets. Don't assume there's room.
• Acclimate your pet to the carrier weeks in advance. Leave it open at home with treats inside. Take short car rides. Make it a positive space.
• Visit your vet 7–10 days before travel. Get the health certificate and discuss anti-anxiety options — but never sedate your pet for a flight. Airlines prohibit it.
• Feed 4–6 hours before departure. A full stomach plus turbulence is a bad combination.
• Exercise your pet before the airport. A tired pet is a calm pet.
• Fly during mild weather. Temperature embargoes can cancel your pet's travel if ground temps are too hot or cold.
• Freeze a small dish of water. It won't spill during boarding but melts gradually in flight.

Planning a trip with your pet? Track your flight price on Autopilot — if the fare drops after you book, you can put the savings toward that pet fee.

The Most Pet-Friendly Airlines, Ranked

1. Alaska Airlines — Lowest full-service fee ($100), cargo option, rabbits accepted, two pets per carrier. The clear winner.
2. Hawaiian Airlines — $35 interisland, $100 mainland, cargo available. Limited by route network.
3. Frontier Airlines — Cheapest at $99, widest variety of animals (six species). Budget carrier trade-offs.
4. Southwest Airlines — $125 with the most generous carrier dimensions. Domestic only.
5. Spirit Airlines — $125, accepts rabbits and birds. Soft-sided carriers only.
6. Delta Air Lines — $150, household birds allowed. No cargo option hurts.
7. American Airlines — $150, generous carrier sizes. No cargo for civilians.
8. United Airlines — $150, no Hawaii/UK/Ireland. Can bring two pets with second seat.
9. JetBlue — $150, smallest carrier limits. No cargo, no Hawaii or UK.

Frequently Asked Questions

How much does it cost to fly with a pet in the cabin?

In-cabin pet fees range from $35 (Hawaiian interisland) to $150 (American, Delta, United, JetBlue) per direction in 2026. Frontier is the cheapest widely available option at $99 each way. Fees are per carrier, per segment — a round-trip with a connection could mean paying four times on some carriers.

What size carrier fits under an airline seat?

Most airlines allow carriers up to roughly 18" x 11" x 11". Alaska and Hawaiian are smaller at 17" x 11" x 9.5", while Southwest is the most generous at 18.5" x 13.5" x 9.5". Soft-sided carriers are preferred because they compress slightly to fit.

Is there a weight limit for in-cabin pets?

Most major U.S. airlines don't publish a specific weight limit. The real test is whether your pet fits comfortably in an approved carrier that fits under the seat. Practically, that means roughly 15 to 20 pounds for the pet and carrier combined.

Can I bring my cat on a plane?

Yes. Every major U.S. airline that allows in-cabin pets accepts cats. Same rules, same fees, same carrier requirements as dogs. Cats generally travel well since they're comfortable in enclosed spaces.

Do airlines still accept emotional support animals?

No. Since 2021, every major U.S. airline treats ESAs as standard pets — same fees, same carrier requirements. Only trained service dogs fly free under DOT regulations.

Which airlines allow pets in cargo?

Very few in 2026. Alaska Airlines and Hawaiian Airlines offer cargo pet transport to the general public. American and United have cargo programs restricted to military and State Department personnel. Everyone else: no cargo option.

What documents do I need to fly with my pet?

Domestically, most airlines require a health certificate from a vet issued within 10 days of travel plus proof of rabies vaccination. Internationally, you'll need a USDA-endorsed health certificate (APHIS Form 7001) and destination-specific documents like microchip records, titer tests, and import permits.

Can I fly with a large dog?

Not in the cabin on any traditional U.S. airline — your pet must fit under the seat. For larger dogs, Alaska Airlines offers cargo up to 150 lbs (pet plus kennel) and Hawaiian has a checked baggage option. JSX, a semi-private carrier, allows dogs up to 70+ pounds on a purchased adjacent seat, but their routes are limited.

Traveling with a pet takes planning, but it's doable on most U.S. airlines. The key is knowing the rules before you get to the airport. Track your flights on Autopilot to make sure you're getting the best price — fare savings can help offset those pet fees.

Disclaimer: Airline pet policies, fees, and requirements change frequently. The information in this article is current as of May 2026 but may not reflect the latest updates. Always verify policies directly with your airline before booking. This content is for informational purposes only and does not constitute professional veterinary or legal advice.