Sihanoukville International Airport (KOS): The Quiet Coast & Islands Gateway for Aussies

Practical first-hour-on-the-coast checklist

• Cash. ATMs at KOS arrivals dispense both USD and KHR Riel — Wing, ABA, and Acleda Bank machines are present. Pull $50–100 USD in small bills for the tuk-tuk and the ferry. The currency-exchange counter charges a worse rate than the ATMs, so skip it if you can.
• A local SIM or eSIM. Smart Axiata and Cellcard counters are immediately past customs; expect $5–10 USD (~$8–15 AUD) for 5–20 GB of data and 7–30 days of validity. If you booked an eSIM through Airalo or Holafly before flying, activate it on the terminal wifi before you leave.
• Ferry timing. Koh Rong and Koh Rong Sanloem ferries run on a daily schedule — first ferry around 8 am, last around 5 pm. Speed-Ferry Cambodia and Buva Sea Cambodia are the two operators. Confirm at the pier kiosk; round-trip is $20–25 USD (~$30–38 AUD) and tickets can be open-return.
• Bag arrangement. If you're heading to the islands today, most bungalow accommodation will store your big bag at the pier-side luggage office for $1–2 USD per day. Travel onto Koh Rong with a small daypack and beachwear only — moving big suitcases over sand and longtail-boat transfers is a known coast headache.

Cambodia's southern coast has two distinct seasons: dry from November through April (clearer water, busier islands, slightly higher accommodation prices) and wet from May through October (cheaper, quieter, occasional ferry cancellations on rougher days). Our best-time-to-visit guide and the broader first-trip planning checklist cover what month suits which kind of Aussie trip.

Common Aussie mistakes at KOS

• Treating KOS like KTI. The two airports are nothing alike. KOS has one terminal, limited international routes, no rail link, no big lounge, and no second-runway. If your routing assumes a long layover with a comfortable airside lounge, you'll be disappointed. Plan your buffer around a small regional airport, not a hub.
• Banking on VoA. VoA is legitimate at KOS and the queue is short, but the eVisa lane is still smoother because the paperwork is already approved. Aussies who try to VoA without USD cash on them get sent back to the airport ATM — small but real friction at the end of a long flight.
• Underestimating the ferry schedule. Last ferry to Koh Rong departs in the late afternoon. Aussies who land at KOS after 3 pm and try to push for the islands the same day routinely miss the last boat and sleep an unplanned night in Sihanoukville town. If your inbound lands after 2 pm, plan one night in Sihanoukville before crossing.
• Bringing only AUD. The Cambodian coast runs on USD. Most beach bungalows, restaurants, dive shops, and tuk-tuk drivers want USD or a USD-equivalent rate paid in KHR Riel. Aussies who arrive with only AUD and no USD cash spend the first hour at an airport exchange counter taking poor rates. Pull $200–500 USD from your Australian bank before you fly.

If you're still scoping whether to apply for the eVisa or risk the slower visa-on-arrival lane at KOS, our eVisa vs visa on arrival comparison runs the side-by-side. Most Aussies land on eVisa for KOS because it removes one decision from a long travel day.

Departing from KOS: timings, exit Immigration, and routing back

If your departure is the start of a regional combo — Vietnam, Thailand by air, or a Bangkok stopover — our cross-airport airports overview and the e-Arrival form guide cover what changes when KOS is your departure rather than your arrival.

Next steps and related reading for Australians: apply for your Cambodia eVisa when you are ready to lodge, bookmark our Cambodia visa hub for Australian citizens as the single canonical reference, skim the FAQ on Cambodia visa eligibility for quick answers, and use our glossary of Cambodia visa terms to decode any acronym in this guide.