Originally Posted by MegatopLover

TG does run fare sales from time to time. CX also has decent fares, though in my experience you only get a deal if you buy roundtrip. For example, I've seen one-ways at around $500 BKK-SIN in J, but throw in the return SIN-BKK and the fare only goes up to about $630. CX runs both ways around mid-day, the middle segment of overlapping triangle routes HKG-SIN-BKK-HKG and HKG-BKK-SIN-HKG.

A couple of years ago, CX was even cheaper. You might get good deals still through travel agents in BKK.

Unfortunately, some of the carriers that kept J fares low on this route have withdrawn from service. For example, three years ago, you could get BKK-SIN-vv on Swiss for under $400. Alas, Swiss has dropped the route.