Getting In and Out of Siem Reap by Bus
Booking an intercity bus out of Siem Reap two weeks ahead feels like overkill until the seat you wanted on the good line is gone and you are stuck comparing three companies you have never heard of.
Giant Ibis is the one worth paying more for
Giant Ibis sets the standard on Cambodia’s intercity routes: onboard Wi-Fi, power outlets, seatbelts, and staff who handle the paperwork at border crossings for you. It runs Phnom Penh (5 to 6 hours), Battambang (about 3 hours), and Bangkok (around 8 hours via the Poipet border crossing), and it costs more than the alternatives for exactly those reasons.
Mekong Express and Virak Buntham cover the same routes for less
Both operators run the same main corridors at lower fares, and Virak Buntham in particular offers night-sleeper buses that let you skip a hotel night by traveling while you sleep. The tradeoff is real: fewer onboard comforts, and a night bus arriving at 5am puts you into a new city before anything is open, which suits some travelers and genuinely ruins the day for others.
The Poipet border crossing deserves its own plan
The Bangkok run means walking across the Poipet land border on foot between Cambodian and Thai immigration, not staying on one bus the whole way. Keep your passport and any visa paperwork out and accessible rather than buried in checked luggage, and expect the crossing itself to add time beyond the bus’s scheduled hours. Cambodia carries a Level 1 safety rating from the US State Department, and the crossing itself is routine, but keep small bags zipped and close while you wait in the immigration queue on either side.
If you came here looking for a temple bus tour
That is a different, and much shorter, answer: there is no hop-on bus circuit around Angkor’s temples, and never has been. Tuk-tuks and private minivans do that job instead, at day rates rather than per-seat fares, and the province guide covers those costs and the exact routes in full.
Verdict: pick Giant Ibis if Wi-Fi and a guaranteed seat matter more than the fare difference, and pick a night-sleeper only if arriving before dawn genuinely works for your first morning in the next city.
Carry pristine, unfolded US dollar bills for the fare and any onboard snacks; Cambodian counters reject notes with tears or heavy creases without exception, border crossings included.