I find checking the Wiki page for the airport to be the most enlightening. Local airport/tourist agencies tend to keep them up to date. The page notes the 2012 seasonal routes, so it looks pretty accurate.
http://en.wikipedia.org/wiki/Keflav%...tional_Airport
AF/KL serve the airport via Transavia. Which I believe is a non-member affiliate (no miles). There's a few OW and ST members, but most of the airlines serving the airport are LCCs.