HAN to KOS, Noi Bai International Airport to Sihanouk International Airport Cheap Flights

Based on HopeGoo data, VietJet Air offers one-way fares as low as US$121 on Cheapest nonstop routes (e.g. HAN to KOS on Wed, Mar 18), while VietJet Air offers Cheapest nonstop round-trips from US$364 departing on Sat, Mar 21 and returning on Tue, Mar 24.

At the moment, you can catch a nonstop flight from Hanoi to Sihanoukville with the following airlines, including: Vietravel Airlines Vietnam Airlines Selected airlines are based on historical data collected from flight bookings users made on HopeGoo within the last 90 days.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Hanoi to Sihanoukville is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Hanoi to Sihanoukville, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Mar 18, with one-way flights priced at just US$121. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is VietJet Air. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Sihanoukville travel is around January. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Hanoi to Sihanoukville is November, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Hanoi to Sihanoukville on February 28, 2026 with Vietnam Airlines, with prices starting at US$198.

You can land at any one of the following hubs in Sihanoukville, with Noi Bai International Airport to Sihanouk International Airport (HAN-KOS) is by far the most common option on this route: Sihanouk International Airport (KOS).

The time difference between Sihanoukville and Hanoi is 0h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.