The airfare is only the start of the bill when a pet is coming along. The pet fee is a flat charge that has climbed sharply over the past couple of years, and because of how airlines apply it, the number on the fare page is rarely what you actually pay. Here is the full 2026 picture, and the handful of choices that decide whether the pet costs you $100 or $600.
How much does it cost to fly with a pet in the cabin?
For a small dog or cat that fits in a soft carrier under the seat, you pay a flat in-cabin fee. It has nothing to do with the pet's weight or the fare you paid, and it is the same whether your ticket cost $79 or $790. Here is where the major US airlines stand in 2026:
| Airline | In-cabin pet fee (each way) | Charged per segment? | Notes |
|---|---|---|---|
| American | $150 | Yes | One carrier per passenger, must fit under the seat. |
| Delta | $150 | Yes | Raised in 2026 from around $95. |
| United | $150 | Yes | Carrier counts as your personal item. |
| JetBlue | $150 | Yes | Earns TrueBlue points on the fee. |
| Southwest | $125 | Yes | Two pets per carrier allowed on some fares. |
| Alaska | $100 | Yes | Among the lowest of the majors. |
| Frontier | $99 | Yes | Cheapest of the group, ultra-low-cost carrier. |
The phrase to circle in that table is per segment. Almost every US airline charges the fee for each individual takeoff, not for the trip. That single detail is where most of the surprise cost lives, so it gets its own section below.
Why the per-segment rule is the real cost driver
Say you fly Delta from your home city to a destination that needs one connection, and you do it round trip. That is four flight segments: out, connect, back, connect. At $150 a segment, the pet alone costs $600, more than many of the airfares we write about on this site.
Now fly the same pet on a nonstop round trip. Two segments, $300. You just halved the pet cost by changing nothing but the routing. This is the opposite of the usual layovers versus direct math, where connections normally save you money. With a pet in the cabin, the nonstop is often the cheaper total once the per-segment fee is counted. Always price the pet fee into the routing decision, not just the fare.
Find the nonstop before you book the pet
A nonstop can cut the pet fee in half. FareFinderAI compares hundreds of airlines in one free search so you can spot the direct routing that keeps the total down.
Search Nonstop Flights Free →Cabin, cargo, or checked: which applies to your pet?
Airlines split pet travel into three lanes, and the price gap between them is enormous.
- In cabin (cheapest): Small dogs and cats, usually under about 20 pounds including the carrier, that fit in a soft bag under the seat in front of you. This is the $99 to $150 tier above. Space is limited per flight, so you must reserve the pet spot when you book.
- Checked pet: Larger animals that travel in a hard crate in the temperature-controlled hold. Pricing runs a few hundred dollars per direction, and many airlines have tightened or paused this service, so availability is the first thing to confirm.
- Cargo or pet shipping: The most expensive lane, often several hundred to over a thousand dollars, used for the largest animals, certain breeds, or international moves with paperwork. Usually booked through a separate cargo desk or a pet relocation service.
For most vacation travelers with a small dog or cat, the cabin is the only tier that makes financial sense. If your pet is too big for a carrier, the cost jumps into a different category entirely and is worth pricing carefully before you commit to the trip.
What service animals cost (and what changed)
Trained service dogs fly free under US Department of Transportation rules and are not charged a pet fee. You complete a DOT form in advance attesting to the dog's training. The rules changed a few years ago on emotional support animals: US airlines no longer recognize them as service animals, so an ESA now travels as a regular pet and pays the standard fee under the standard carrier rules. If you have been out of the loop since before that change, budget for the pet fee rather than assuming the old exemption.
Five ways to keep the pet cost down
- Fly nonstop. The biggest single lever. Every avoided connection removes one per-segment fee.
- Compare carriers on the fee, not just the fare. A $40 cheaper base fare on one airline can be wiped out by a $50 higher pet fee across four segments. Frontier and Alaska sit at the low end.
- Reserve the cabin pet spot early. Each flight caps the number of in-cabin pets. Sell-outs push you to a later flight or the far pricier cargo lane.
- Keep the pet as your personal item. The carrier usually counts as your under-seat personal item, so travel carry-on only for yourself to avoid stacking a checked-bag fee on top.
- Watch basic economy. Some basic fares limit or bar carry-on and complicate add-ons. Confirm the pet is allowed on the fare class first, and run the wider math with our basic economy guide.
Traveling as a family with both kids and a pet? The same off-peak, nonstop thinking that keeps the pet fee down also cuts the human fares, and our flying with kids cheaply guide covers the seating and date tactics that stack on top.
Frequently asked questions
The pet fee is one of the few travel costs that is entirely predictable, which makes it one of the easiest to plan around. Pick a low-fee carrier, book the nonstop, reserve the cabin spot early, and the pet stops being the wildcard in the trip budget.