emma it will be about 45 to 60 YTL at night dependent on your haggling skills. Where are you going to in Konyaaltı??
The exchange in the airport wont give you great rates so dont change too much there.
I've used Transfers4cheap and resort hoppa for transfers between Antalya and Avsallar and they are both reliable and under £20 one way. Both can be booked on the internet. If you just type in the browser Antalya Transfers lots of different options will come up.
I have tried www.antalyaairportshuttle.com plenty of time, Luxury and comfortable cabs, driver waits you near exit gate.They drive safety and quickly to your home or property,
The most important thing , they are very cheap !!!