Booking a Delta Air Lines flight and wondering about Delta’s seat selection? It’s no wonder — with differing benefits for elite members and strict restrictions on basic economy tickets, figuring out how and when to choose your Delta seat can quickly become overwhelming.

Here's a look at Delta seat assignments, how Delta Air Lines’ seating system works and the costs of choosing a seat.

How Delta seat selection works

Delta operates a variety of cabin classes on its aircraft, including economy, Premium Select, first class and Delta One seats.

Like most airlines, Delta will allow you to select your seat when booking, though the cost to do so and any upcharges will vary depending on the flight you’re taking. Those flying with families and wondering “does Delta seat families together?” are in luck. Delta does its best to seat families together, even after check-in.

Delta seat selection fee

According to an analysis of airline fees by NerdWallet, Alaska Airlines and Hawaiian Airlines charge the least for seat selection, while budget airlines Frontier and Spirit charge the most.

Delta sits in the middle, charging an average of $15-plus for each flight that you'd like to select a seat for. The cost will vary depending on the type of ticket you book with the airline — which we'll discuss next.

Ticket types and seat selection rules

How much is seat selection on Delta Air Lines? That will depend on the ticket type you’re purchasing, be it basic economy, main cabin, Premium Select (premium economy), first class or Delta One.

Basic economy

Basic economy tickets have the most restrictions of any Delta ticket, and this extends to seat selection. Those who book basic economy tickets won't be able to select seats; instead, a seat will be randomly assigned to each passenger after check-in. This includes families and groups who are traveling together — expect to be split up when booking a basic economy ticket.

If you reserve a basic economy ticket, it’s possible to purchase a specific seat starting seven days before departure. Pricing for this varies by trip and is priced by segment.

Main cabin

Main cabin seating, also known as regular economy, includes complimentary seat selection. As a main cabin customer, you also have the option to purchase an upgrade to preferred or Delta Comfort Plus seats while remaining an economy class passenger.

You can also book upgraded economy tickets with additional seat selection perks:

Main Cabin Preferred: Main Cabin Preferred seats are functionally the same as regular main cabin seats. The difference lies in the seat location; Main Cabin Preferred seats are typically window and aisle seats nearer to the front of the plane, plus exit rows. These are the least expensive upgrades from standard economy seating.

Comfort Plus: When available, a Delta Comfort Plus ticket can be purchased directly while booking and the price will include seat selection. The cost to upgrade is higher than for a preferred seat in main cabin. Comfort Plus features more legroom than main cabin and offers passengers dedicated overhead bins. In addition, Comfort Plus guests will receive complimentary beer and wine on all domestic and short-haul international flights.