you cant fly because you cant fly from
dalaman to antalya the distance is too short so the internal turkish airline companies dont do this route
its about 5 or 6 hours to antalya and about another hour from antalya to side
use the bus - very good service and good buses and wont be too expensive
will take about 7 hours im guessing though
unfortunately this is your cheapest and quickest option unless hiring a private car
hope this helps
xxxx