Yes, you can almost always change your flight seat after booking, though the ease and cost of doing so depend on your airline and ticket type. In 2026, most carriers allow you to manage your seat selection via their mobile app or "Manage My Booking" portal up until the time of check-in. If you purchased a "Basic Economy" or "Light" fare, you may be charged a fee to select or change your seat, or you might be limited to whatever is available at the 24-hour check-in window. For standard economy, premium, or business class passengers, seat changes are often free, provided you are switching to a seat within the same cabin category. If you want to move to a seat with extra legroom or a "Preferred" seat near the front of the plane, you will likely need to pay an upgrade fee. It is a "pro tip" to check the seat map frequently leading up to your flight, as better seats often become available when elite members are upgraded or other passengers change their travel plans.