PREMIUM
Giant Ibis (VIP)
VIP 25-seat, USB charging + WiFi
4-6x daily
Price
$14-18
WiFi English-speaking staff Snacks + water Free luggage Insurance
SE Asia bus route
🇰🇭 Siem Reap Phnom Penh 🇰🇭
Siem Reap to Phnom Penh via National Highway 6 is Cambodia's spine bus route. Giant Ibis is the tourist-recommended operator — safe, English-speaking staff, on-time, and worth the small premium over Cambodian domestic operators. Cambodia Post VIP is a solid alternative. Local operators (Rithya Mony, Kim Seng) are budget options — safe but slower + fewer English signs. Avoid the very cheapest buses ($6-8 range) — accident-prone drivers + old vehicles. Journey is 5-7h with a 30-min meal stop halfway. Fast boat via Tonle Sap is an alternative (6h, more expensive, dry-season only).
Distance
320 km
Duration
5-7h
Operators
4
Region
SE Asia
Scam-note + booking tips
Book Giant Ibis + Cambodia Post directly on their websites, 12go, or at their offices in Siem Reap (Pub Street area) + Phnom Penh (Sisowath Quay). AVOID buses under $6-8 sold by tuk-tuk drivers or unbranded street agents.
Operators comparison
RELIABLE
Cambodia Post VIP
AC 32-seat + reclining
4-5x daily
Price
$10-14
AC Reclining Free luggage
RELIABLE
Mekong Express (Cambodia)
AC 25-seat VIP
3-4x daily
Price
$12-15
WiFi English staff
BUDGET
Rithya Mony / Kim Seng (Cambodian domestic)
Standard AC 40-seat
Price
$6-9
AC
Older fleet + fewer safety controls. Fine for budget travellers but not the tourist-recommended pick.
Book Siem Reap → Phnom Penh
Live schedules + prices. Cancel free 24h before departure.
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Frequently asked
Is Giant Ibis the safest Cambodia bus?
Yes — the go-to operator for tourists + expats. Modern VIP fleet, English-speaking staff, on-time record, and included insurance. Small premium ($4-6 more than Cambodian domestic) buys real reliability. Cambodia Post VIP is the strong runner-up.
How long is Siem Reap to Phnom Penh?
5-7 hours via National Highway 6, depending on operator + traffic. Giant Ibis + Cambodia Post typically 5.5-6h with one 30-min meal stop. Budget operators 6-7h with more stops.
Where does the Phnom Penh bus arrive?
Giant Ibis: their office on Sisowath Quay near the Royal Palace (walkable to riverside hotels). Cambodia Post: their terminal on Charles de Gaulle Boulevard. Both central + safe for foreign arrivals.
Bus or fast boat Siem Reap to Phnom Penh?
Fast boat via Tonle Sap: 5-6h in dry season (November-April only), $30-45, scenic. Bus: year-round, $10-18, similar time. Boat wins on views + experience; bus wins on cost + reliability. Book fast boat 24-48h ahead in high season.