Does it cost money to buy a plane ticket, upgrade and choose a seat?

Whether it costs money to buy an upgraded seat depends on different airlines and service types.

Generally speaking, there is no extra charge for choosing seats on airline official website or APP. However, if you buy a seat on an agent or a third-party platform, you will be charged a certain service fee or handling fee.

If you choose a seat type that requires additional fees, such as business class or first class seats, you also need to pay the corresponding fees.