- Nattakan Transportation (Siem Reap Branch) is the only direct bus from Siem Reap to Bangkok and vice versa. Nattakan operates 2 departures daily which are 0800 and 0900 from Siem Reap to Bangkok. And 2 more departures from Bangkok to Siem Reap with the same times. It costs USD 28.00 a ticket including a free pickup service from your hotel to the station (only 1 kilometer around the station is allowed).
- Nattakan Transportation (Phnom Penh Branch) is also a direct bus departure from Phnom Penh to Bangkok. Yet, on the even day only which means 2nd, 4th, 6th, etc. This means the Thai bus will arrive in Cambodia from Bangkok on the odd day. Leaving from Phnom Penh to Bangkok on the odd day is strongly not recommended.