With more people flying into Antalya these days here are a few tips and helpful links for finding flights to Antalya for booking flights without a travel agent or package tours..

http://book.flythomascook.com/skylights/cgi-bin/skylights.cgi
http://www.britishairways.com/travel/home/public/en_gb
http://www.kthy.net/kthyen/index.html
http://www.thy.com/en-INT/index.aspx
http://www.flypgs.com/EN/
http://www.cheapflights.co.uk/flights/Antalya/London/

Another thing one can try is to find cheaper flights to Istanbul and then change to domestic flights to Antalya..flying domestic from Istanbul to Antalya starts at about 79-104 liras one way per person ( 32.6546 GBP - 42.9804 GBP ) if booked early enough..

Domestic airline carriers in Turkey

http://www.onurair.com.tr/
http://www.thy.com/
http://www.atlasjet.com/
http://www.flypgs.com/EN/
http://www.sunexpress.de/english/announcement_100126_0.html

Easy jet I believe right now is offering great flights to Istanbul flying into SAW..and the you can use Pegasos for internal flights to Antalya also out of SAW..Sabiha Gokcen Airport (SAW)

http://www.easyjet.com/en/book/index.asp