Ubon Ratchathani to Siem Reap by bus
Siem Reap lies 234 km (146 mi) south-west of Ubon Ratchathani, in the same time zone. What the numbers say about getting there.
A coach takes about 4 h 27 min including stops, over roughly 286 km (178 mi) of road.
| Ubon Ratchathani | Siem Reap | |
|---|---|---|
| Country | Thailand | Cambodia |
| Population | 122,533 | 139,458 |
| Elevation | 125 m (410 ft) | 18 m (59 ft) |
| Time now | UTC+7 (Asia/Bangkok) | UTC+7 (Asia/Phnom_Penh) |
What changes when you arrive in Siem Reap
Crossing from Thailand into Cambodia: money changes from the Baht to the Riels (KHR); traffic switches to the right; sockets are BS 1363, Euro, NEMA 1-15; the dialling code becomes +855; the emergency number is http://www.wikidata.org/entity/Q11185210 / http://www.wikidata.org/entity/Q2807090.
Where to book buses from Ubon Ratchathani to Siem Reap
We take no bookings for these providers and hold no reservation with them. The provider you choose handles payment, confirmation, changes and refunds. How that works.
Staying in Siem Reap
Live rooms and prices for Siem Reap are in the search below.
Book a hotel in Siem Reap
Live rooms and prices from our booking partner, booked and paid for here. Free cancellation is marked where it applies.
Common questions
How far is Siem Reap from Ubon Ratchathani?
234 km (146 mi) in a straight line, south-west of Ubon Ratchathani; by road roughly 286 km (178 mi).
How long does it take to get from Ubon Ratchathani to Siem Reap by bus?
About 4 h 27 min, estimated from distance and typical speeds. Timetables and traffic decide the real figure.
Is there a time difference between Ubon Ratchathani and Siem Reap?
No, both are on the same offset at the moment.
What currency do I need in Siem Reap?
The Riels (KHR).
Where these facts come from
- GeoNames (CC BY 4.0): population, elevation, time zone, postal codes
- Wikidata (CC0): area, sister cities, visitor numbers, heritage listings, stations and ports
- OurAirports (public domain): airports, runways
- Natural Earth (public domain): map outlines
Data compiled 14 September 2026. Hotel and hostel figures are from our booking partner’s catalogue on that date. Journey times on this page are estimates from distance, not timetables; check the operator before you rely on one.