Do you know ...??

Do you know if there is any CHEAPEST air tickget from Singapore to Bangkok (Thailand)? Which airline does it offer? Since my friend keeps coming to BKK every week but it's so expensive for the tickget, then I would like to know if there is any cheapest price that's available or not? At least, around 7,000 Baht+ (or around 209 U.S Dollars)..If anyone knows, please gimme some suggestion, anyway thanks in advance!~ ^o^"