Airline Seat Policies for Plus-Size Travelers (2026)
Monday, November 09, 2026
Most major US airlines use the armrest as the line. If you can't sit with both armrests down, they expect you to buy a second seat, ideally when you book. What changes from airline to airline is whether you can get that second seat refunded, and Southwest's rules changed in 2026, so older advice you find online may be wrong.
Below is what each airline's own policy page says as of late 2026. I only included airlines where I could read the current official policy. If your airline isn't here, call them before you book.
The rule almost every airline shares: the armrest
Southwest, Frontier and Alaska all say it plainly. The armrest is the boundary between seats. Delta's policy recommends an extra seat if the armrests can't stay down while you're seated. If you need space past that armrest, the airline considers that a second seat.
A seat belt extender does not change this. It solves a belt problem, not a width problem. Alaska says outright that an extender is not a substitute if you can't travel comfortably with the armrests down.
My advice: be honest with yourself before holiday travel. If the armrests won't lower without pressing into you, plan for two seats or a wider cabin. The gate on a full December flight is the worst place to find out.
Southwest Airlines
Southwest used to be the go-to airline for plus-size travelers. You could buy a second seat and request a refund after the trip, or ask at the gate for a free one, even on full flights. That changed on January 27, 2026, the day Southwest moved to assigned seating.
Here's what Southwest's extra seat policy says now:
- The armrest is the definitive boundary between seats.
- Southwest strongly recommends buying the extra seat before travel and booking both seats when you make the reservation, so adjacent seats are available.
- If you show up without an extra seat, you'll get a complimentary extra seat only if adjacent seats are available. If the flight is full, you'll be rebooked on another flight. If this is decided after boarding, you may have to deplane.
- Refunds for the extra seat are still possible, with conditions. You must request it within 90 days of travel. The flight has to depart with at least one open seat (or with passengers flying on space-available passes). Both seats must be in the same fare class.
- One seat belt extension per passenger, and it has to be one Southwest provides. You can't use an extension in an exit row.
The practical takeaway: buy the second seat up front, in the same fare class as your own seat. Then request the refund after you fly if the plane wasn't full. Don't count on the gate.
American Airlines
American's special assistance page says that if you need more than one seat, you must book an additional seat by calling Reservations. When you do, they'll arrange two adjacent seats at the same fare.
- If you didn't book ahead, you can ask an airport agent whether two adjacent seats are open.
- You may be offered a seat in a higher class with more space. In that case you pay the fare difference.
- If American can't accommodate you on your original flight, you can buy seats on a different flight at the same price as your original seats.
- Only seat belt extensions provided by American can be used. Ask a flight attendant or gate agent.
American's policy page does not describe a refund for the second seat. Plan on paying for it.
Delta Air Lines
Delta's extra seat policy says that if you can't safely and comfortably fit in a single seat in the class you bought, you should arrange extra seating in advance. That means buying an extra seat, or upgrading to Delta Premium Select, First Class or Delta One.
- Delta recommends an extra seat if the armrests can't stay down while you're seated.
- Basic Economy can't be used for an extra seat, because it doesn't allow advance seat assignments.
- The extra seat is sold at the same fare when you buy it at the same time as your own ticket.
- Delta's policy notes that seat belt extensions are not permitted in the exit row.
- If you don't fly and the tickets were nonrefundable, the extra seat's value can only go toward a new ticket in your name.
Delta's policy doesn't describe a refund for a used extra seat on a nonrefundable fare.
Alaska Airlines
Alaska has one of the most detailed policies, and it still offers refunds in some cases.
- If you can't comfortably fit in one seat with the armrests down, you must buy an additional seat.
- Alaska lists the armrest distance as typically 17 inches in coach and 21 inches in First Class. First Class armrests don't rise, so if you don't fit there, you'd need two coach seats.
- Their seat belt extension adds about 25 inches to the standard 46-inch belt. Only extensions from the airline are allowed.
- To book correctly, call reservations at 1-800-252-7522. Buying both seats together locks in the same price.
- Refunds: you can get the second seat refunded if all Alaska flights in each direction departed with an open seat. Request it within 90 days of travel, online or through Customer Care at 1-800-654-5669.
- If you arrive without a second seat and need one, you'll be asked to buy it before boarding.
Frontier Airlines
Frontier's special services page says customers who can't lower both armrests, or who take up any part of the next seat or the aisle, should book two seats before travel. Frontier also calls the armrest the definitive boundary between seats.
Frontier's page does not mention a refund for the second seat or say anything about seat belt extenders. Since Frontier charges for seat selection, factor in the cost of choosing two seats together.
Airlines I left out
I couldn't confirm current official policies for United, JetBlue or Spirit, so I left them out rather than repeat old summaries. If you're flying one of them, call and ask: when is a second seat required, how do I book the seats together, and is it ever refundable.
Seat belt extenders: what to know
- Southwest, American and Alaska only allow the extension the airline provides, so your own from home likely won't be allowed. Ask a flight attendant or gate agent.
- Southwest and Delta don't allow extensions in exit rows, so skip those seats when you book.
Holiday travel timing
Thanksgiving and Christmas flights fill up. Southwest's free gate seat only happens when adjacent seats are open, and both Southwest's and Alaska's refunds depend on open seats. For holiday flights, assume you'll pay for that second seat and won't get it back.
If you already booked holiday flights for one seat, call the airline now to add the second one. Adjacent seats are easier to get weeks out than days out.
When I plan Orlando trips for plus-size travelers, the airline seat is one of the first things I ask about. Compare the price of two coach seats with a premium cabin seat before you decide.
Quick answers
Do airlines make plus-size passengers buy two seats?
Most major US airlines expect you to buy a second seat if you can't sit with the armrests down. Southwest, Alaska, Frontier, American and Delta all address this in their policies as of late 2026.
Does Southwest still give free extra seats?
Only at the airport if adjacent seats happen to be open. Southwest now strongly recommends buying the extra seat when you book, and it refunds that seat within 90 days only if the flight left with an open seat and both seats were in the same fare class.
Which airlines refund the second seat?
Southwest and Alaska both describe refunds with conditions tied to the flight departing with open seats. American, Delta and Frontier don't describe a refund for a used second seat on their policy pages.
Can I bring my own seat belt extender?
Southwest, American and Alaska say only the extension the airline provides can be used. Ask your flight attendant.
If you're flying to Orlando for Disney or Universal and want help planning the whole trip around what fits your body, send me the details on my travel form. My Fit Finder also covers ride fit by park once you land.
Hi, I'm Jason Vaughn
Fat Tested Travel
I'm a plus size traveler and travel agent. I test theme park rides and cruises in person so you know what fits before you go. Get my ride guides for 40+ parks on the Fat Tested Guides page. More about me.
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