When I go to Singapore in February, I'd like to go to Siem Reap and Sihanoukville and then go back to Singapore. Which airline should I use? I though Silk Air has direct flight Sihanoukville to Singapore but I can't find it. Any suggestion?

Silk Air has a direct flight from Singapore to Siem Reap, but not to Sihanoukville.

Thank you Kathie. Are there any direct flight from Sihanoukville to Singapore? or Do I need to come back to Siem Reap and go back to Singapore?

No, you will have to fly back via Siem Reap.

We flew SR to Sihanoukville in November 2015. The airline was Angkor Air or something like that, I used Skyscanner to find the flight, then booked with the airline direct.

From Sihanoukville it would be easier to get the bus or a car to Phnomh Penh (about 3 hours) where there should be plenty of choices for flights to SIN.

There are many flights each day from REP to PNH so why not take a cheap flight from REP to PNH and then overland from there to SHV either by taxi or one of the many bus/van service? This would certainly reduce your travel time.

Thank you everybody! Which beach is good for solo traveller? not far from airport, not many tourists, good for swimming,easy to find restaurant, etc. Is that worth to stop over to Phnom Penh?