Most hotels and resorts around Antalya ask guests to leave their rooms around midday, while many flights home to the UK, Germany, Scandinavia or Russia leave in the evening or close to midnight. That leaves a gap of six, eight or even ten hours. Handled well, it becomes a relaxed bonus half-day. Handled badly, it means sitting in the lobby with your suitcases, sticky from the heat, watching the clock.
The good news is that a late flight is easy to organise once you sort three things early: where your luggage stays, where you can freshen up, and exactly when your car picks you up. Do all three on the day before departure, not on the morning itself.