KOS (Sihanoukville International) is the small, quiet regional airport that gets Aussies onto the Cambodian coast and across to Koh Rong and Koh Rong Sanloem fastest. Single terminal, short queues, and a tuk-tuk-plus-ferry routing that skips the seven-hour bus from Phnom Penh entirely.
KOS is Cambodia's small southern-coast airport and the closest gateway to Sihanoukville town, Koh Rong, and Koh Rong Sanloem. Single terminal, limited international routes, VoA available with a typical 10–15 minute queue. For Aussies skipping the seven-hour bus from Phnom Penh, KOS is the practical answer. Tuk-tuk from the terminal to the Sihanoukville ferry pier runs $5–8 USD (~$8–12 AUD); a round-trip island ferry to Koh Rong is $20–25 USD (~$30–38 AUD). Pre-apply for your Cambodia eVisa and submit the e-Arrival Card inside the 7-day window before you fly.
If your Cambodia trip is built around the southern coast — Sihanoukville beaches, Otres, Ream National Park, or one of the two main islands at Koh Rong and Koh Rong Sanloem — Sihanoukville International (KOS) is the airport you want. It's small, regional, and quiet compared to KTI in Phnom Penh or SAI in Siem Reap, but for Aussies headed to the coast it removes the worst friction in the whole trip: the seven-hour bus from the capital.
KOS isn't a place to linger. Single terminal, a handful of food kiosks, one currency-exchange counter, an ATM row, and a tuk-tuk rank outside arrivals. The international route list is short — mostly domestic links to Phnom Penh and a thin set of regional flights from Bangkok and other ASEAN hubs depending on the season. There are no direct flights from Australia. The realistic Aussie routing is Sydney/Melbourne/Brisbane to a Southeast Asian hub (Bangkok, Singapore, or Kuala Lumpur), then a regional hop into KOS or — more commonly in 2026 — a domestic Cambodia Angkor Air leg from KTI down to KOS once you've cleared Cambodian Immigration in Phnom Penh.
The honest read on KOS is that it's a regional airport, not a hub. The terminal is roughly the size of a large Australian regional like Coffs Harbour or Hervey Bay. There is one Immigration line for foreigners, one for Cambodian nationals, and a VoA booth tucked to the side that opens for arriving international flights. Bag claim is two carousels, and the walk from the gate to the kerb is short — five minutes if you're not browsing the duty-free.
The standard Aussie routing is straight from the terminal to the Sihanoukville ferry pier. From KOS, the tuk-tuk run to the pier is $5–8 USD (~$8–12 AUD) and takes 15–25 minutes depending on whether the driver loops through Sihanoukville town centre first. If you're staying in Sihanoukville itself rather than crossing to the islands, the same tuk-tuk into town costs the same and takes 25–35 minutes to reach the Otres and Serendipity beach areas where most Aussie accommodation sits.
There is no rail link, and the local minibus is infrequent. Grab works in patches around Sihanoukville but is much thinner here than in Phnom Penh. Pay your tuk-tuk in USD — drivers prefer it and the rate is fairer than KHR converted at the airport exchange. A fixed-rate airport taxi is available at $12–15 USD (~$18–23 AUD) if you'd rather sit in air-conditioning for the ride, particularly during the November–April hot months.
KOS has no major paid lounge. There's a small business-lounge area used by Cambodia Angkor Air for its premium domestic passengers, but Priority Pass and Amex Platinum coverage is limited. Airside food is a handful of cafes, a small bakery, and a convenience kiosk. Don't bank on doing real shopping or eating here — sort food in Sihanoukville town or on the island side instead. The duty-free is small and pricier than the regional average.
The KOS arrival flow is one of the cleanest in Cambodia simply because the volume is low. Off the aircraft, follow the Arrivals signs (trilingual Khmer/English/Chinese, but the directional icons do the heavy lifting). The walk to Immigration is roughly 3–5 minutes from the gate. Split into the foreigners queue — don't drift into the Cambodian nationals lane. From start to kerb, most Aussie arrivals at KOS take under 30 minutes.
After the stamp, you walk through to baggage claim. Two small carousels, usually only one running at a time. Bags appear within 10–15 minutes of touchdown for most arrivals. Customs is a green-channel walk-through unless you're declaring something. Out the door, the tuk-tuk rank is on your immediate right and the fixed-rate taxi desk is on your left.
Pre-print everything
KOS is small enough that a single misstep — phone-only eVisa, no e-Arrival QR, no small USD bills for the tuk-tuk — sticks out. Print two paper copies of your eVisa PDF, screenshot the e-Arrival QR, and pull $50–100 USD in small bills from your Australian bank before you fly. The terminal ATM works but charges a flat fee around $4–5 USD per withdrawal.
Once you have your passport stamped and your bag in hand, the next move at KOS is one of two things: tuk-tuk to the Sihanoukville ferry pier for an island crossing, or tuk-tuk into Sihanoukville town if you're sleeping on the mainland tonight. Four things to sort before you leave the airport carpark.
Four mistakes account for most of the messy KOS arrivals we see. None are catastrophic, but each can cost you an afternoon or a missed ferry.
Departure at KOS is even shorter than arrival. For an international departure from Sihanoukville, plan to leave your hotel two-and-a-half hours before scheduled departure. For a domestic hop to KTI Phnom Penh, two hours is plenty. The drive from Otres or Serendipity to KOS is 25–35 minutes; from the ferry pier (if you're coming straight off the island), 15–25 minutes.
Check-in opens 2 hours before departure for international and 90 minutes for domestic. There is no airport departure tax to pay at the counter — it's bundled into your ticket. Hand over the second printed copy of your eVisa (the one Immigration returned on arrival) along with your passport at the exit window. You will not need the e-Arrival on the way out; only the eVisa.
Airside at KOS is modest. A small duty-free, two or three cafes, a convenience kiosk. Power outlets exist at most gate seating areas but are limited at the smaller domestic gates. Wifi is free but slow — if you're working remotely on the way out, expect to tether to a local SIM. Most concession stores close around 8 pm, so late-evening domestic departures are very quiet.
Bangkok to KOS is the cleanest air routing for Aussies skipping Phnom Penh.
Read the 2026 update →Pair the Cambodian coast with Vietnam by overland from Phnom Penh.
See the combo guide →Luang Prabang adds calmly onto a Sihanoukville-first itinerary.
Plan the Laos route →SIN to KTI then domestic to KOS — the second-most-common Aussie routing south.
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