PBair is a Thai low cost air carrier offering discount tickets to various destinations in Thailand:

Northern Route: Lampang, Nan
Northeastern Route: Roi-et, Sakonnnakhon,Nakhon Phanom
Southern Route: Trang, Nakhon Si Thammarat
International Route: Danang - Vietnam

Travellers to/from the northern states of Malaysia could consider taking a flight to/from Trang, Thailand.