Taxi From Bangkok to Siem Reap | Visit Koh Rong
https://www.visitkohrong.com/bangkok-to-siem-reap/
If you’re looking for a bit of comfort during your trip, then a private taxi is your best option. The journey will take approximately 9 hours in total and there is some absolutely stunning scenery along the way. On average a private taxi from Bangkok to Siem Reap will cost in the region of $250 (that’s usually the quote from Bangkok airport to Siem Reap). You’ll have the option of stopping for toilet breaks, coffees, and even sightseeing if you wish.
https://www.visitkohrong.com/bangkok-to-siem-reap/