Why do airlines sell more seats than available?

Overbooking is how airlines ensure that there are no available seats when a flight departs. So they sell more tickets in advance than there are seats on the plane. The point of all this is to ensure that the plane is full when it takes off, because empty seats are a financial burden for airlines.



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Seats that are shown as unavailable on the map may be reserved to accommodate family seating, passengers with disabilities and crew members.

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Sometimes, when an airline asks for volunteers to give up their seats and fly on a different flight, there are not enough volunteers. When this occurs, the airline will select passengers to give up their seats. This is called “involuntary denied boarding” or “bumping.”

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As a result, airlines can, with a degree of certainty, overbook a flight considering the number of no-shows expected, thereby maximizing the capacity available to customers. For consumers, this practice is beneficial because it allows more consumers to fly at the time, date and fare of their choosing.

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Overbooked flight compensation under US regulations If the airline does not make any substitute travel arrangements for you, you are entitled to 400% of the one-way fare price, not to exceed $1,350 as well as any optional fees paid as part of your reservation (e.g. bag fees, seat upgrades, etc.).

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While it is legal for airlines to involuntarily bump passengers from an oversold flight when there are not enough volunteers, it is the airline's responsibility to determine its own fair boarding priorities.

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One is to check in early. Once you check in, you'll probably get a seat assignment, and the chances of getting bumped decrease. Don't wait to board! If you're not in your seat, the airline may assume you won't show up and give your seat to another passenger.

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There is one most important thing to remember when passengers must receive compensation for an airline overbooking a flight. And that is there is no limit to the amount of money or number of vouchers an airline may offer. And passengers are free to negotiate with the airline.

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For domestic flights in the U.S., airlines have to pay you 200% of the value of your one-way ticket up to $775 if you arrive at your destination one to two hours past your originally scheduled itinerary or 400% of the one-way ticket price, up to $1,550 if your arrival delay is longer than two hours.

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Emphatically, no. You will likely get assigned a seat during check-in (though you should still skip it if the airline tries to tack on a fee) or, at the very least, at the gate. Again: You don't have to select a seat in order to get a seat. You just might get stuck with a suboptimal one if you choose to skip it.

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Just say “no.” Within 24 hours of your departure, the airline will assign you a seat. Pro tip: If you want to avoid paying for a seat assignment, arrive at the airport early. That way, you'll have the pick of the unassigned seats.

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They do, sometimes, but you won't get them. First of all, on a lot of flights, next-day isn't nearly last minute enough to warrant a discount. Plenty of people want or need a next-day flight and are willing to pay a premium for it.

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Frontier Airlines bumped the biggest proportion of passengers of the 15 largest US carriers in early 2023. Of every 10,000 Frontier passengers, 3.73 were involuntarily denied boarding due to oversales, the DOT said. Allegiant, Delta, Endeavor, and Hawaiian didn't bump any passengers in the quarter, per the DOT.

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Moreover, every airline in the United States overbooks its flights at least some of the time. All but one, that is. JetBlue Airways (JBLU 2.70%) is the one holdout that chooses not to overbook its flights -- to be more customer-friendly.

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Call (or chat with) the airline When in doubt, call the carrier's customer service line and an agent to check how full the flight is. It might not be the most convenient option, but it will yield an answer. If you dread the idea of waiting on hold, some airlines have also introduced new customer service chat features.

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If there are not enough passengers who are willing to give up their seats voluntarily, an airline may deny you a seat on an aircraft based on criteria that it establishes, such as the passenger's check-in time, the fare paid by the passenger, or the passenger's frequent flyer status.

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Here's a look at American carriers, starting with the worst for overbooking and descending to the best:
  • Spirit Airlines — 78 IDBs per million passengers.
  • Frontier Airlines — 55.
  • Southwest Airlines — 41.
  • Alaska Airlines — 28.
  • American Airlines — 24.
  • United Airlines — 13.
  • Delta Air Lines — 3.
  • JetBlue Airways — 2.


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Let's break down what this actually means: On most airline basic economy tickets, you won't be able to select your seat ahead of time. Instead, you'll be assigned one at check-in or the gate. So you're not any more likely than any other passenger to get bumped from the flight.

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Whether you're flying from New York or New Orleans, Lisbon or London, airlines continue overbooking to compensate for “no-shows” all the time. Simply put, they sell more tickets than they have available seats. And it's not an illegal practice.

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Airline tickets even allow some room for negotiation if you're not satisfied with the results when you search for cheap tickets. If you spend a lot on airline tickets every year, and are part of an airline's frequent flier program, you have more leverage than someone who rarely travels.

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Overbooking is how airlines ensure that there are no available seats when a flight departs. So they sell more tickets in advance than there are seats on the plane. The point of all this is to ensure that the plane is full when it takes off, because empty seats are a financial burden for airlines.

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