Airlines in Thailand
Here is a list of Airlines in Thailand.
Air Asia 
I have flown with Air Asia many times, I’ve been robbed by them once in 2008, they double charged me for 4 round trip flights from Bkk – Phuket, but since then they have been fine for me, they cancelled my Udon to BKK flight last month and refunded me, but I had to argue with them to get the refund. Beware, this is a super budget airline, so they will squeeze every penny out of you in other areas.
http://www.airasia.com
Thai Air 
Thai Air is a little bit more expensive airline in Thailand but they have MUCH better service in every area than all the other airlines. They are usually very flexible about changing flights which is really nice.
http://www.thaiair.com
Nok Air 
Nok Air is a great Thai budget airline with good service.
http://www.nokair.com
Orient Thai Air 
http://www.flyorientthai.com (previously 1-2 Go)
Bangkok Air 
http://www.bangkokair.com
Solar Air has flights mostly to the Chumphon southern region of Thailand.
http://www.solarair.co.th
Crystal Air 
http://www.crystalthaiair.com (site offline)
Happy Air 
http://www.happyair.co.th
Silk Air
http://www.silkair.com (site offline)
Phuket Airlines
http://www.phuketairlines.com
PB Air is owned by Boonrawd Brewery president Piya Bhirom Bhakdi. It has since closed in 2009
http://www.pbair.com (site offline)
If you know of anymore airlines in Thailand then please post in the comments, or let me know
