There is a coach running from the otogar in Antalya to the airport, but it takes around an hour & was 2.5tl in March. Also it depends which international terminal - there are 2, one's close to the domestic terminal, the other is quite a distance from domestic. If you get off at the wrong one (as I did) it's about 10tl in a taxi!!! For the first one you get off at domestic, which is where the bus goes first & walk. Otherwise stay on & go to the other international