How much are Southwest's new assigned seats? It depends.

Southwest Airlines’ first assigned seats went on sale this week for flights starting Jan. 27 of next year.

Southwest Airlines’ first assigned seats went on sale this week for flights starting Jan. 27 of next year. What you’ll pay will vary.

The price depends on the route, when you’re traveling and where you sit. Selecting your ideal seats can add hundreds of dollars to the cost of a family vacation, similar to flying on other airlines.

For example, a roundtrip ticket in the “Choice” ticket class — the second cheapest type of ticket — between Denver International Airport and Orlando International Airport leaving Feb. 14 and returning Feb. 21, which coincides with Presidents Day, was going for $692 on Southwest’s website on Thursday. For seats the airline deems “preferred,” it would be $46 for a window or aisle seat in Rows 7 to 13, or $41 for a middle seat in those rows.

Customers with elite frequent-flyer status on the airline or with Southwest Airlines credit cards will be exempt from some of the fees.

An extra-legroom seat, located in the first six rows of the Boeing 737 Max 8 aircraft, was going for $96 for window or aisle. Prices were similar, but slightly lower, for the return flight.