Originally Posted by
jiejie
If they want to save some coin and add dimension to the side trip, I suggest they fly BKK-PNH spend a day or so, then road trip to Siem Reap which will take a few hours. Then road trip SR back to Bangkok (about 7 hour) or fly one-way from REP-BKK and hold their nose at the cost.
A o/w REP-BKK will price out in N and be 75% of the (expensive) r/t.