Siem Reap to Sihanoukville SAI → KOS
Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS)
The cheapest return found recently is $246 with Air Cambodia, 27 Dec – 7 Jan 2027, found yesterday. The cheapest one-way found recently is $140 with Air Cambodia, 4 Jan 2027, found yesterday.
Return
The cheapest return fare on each of 11 departure dates is usually $228 to $255.
Cheapest return found recently
$246
27 Dec – 7 Jan 2027 · Air Cambodia
Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS)
Leaves 3:00 p.m. · Return leaves 11:05 a.m. · 2 h 5 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Cheapest nonstop return
$246
27 Dec – 7 Jan 2027 · Air Cambodia
Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS)
Leaves 3:00 p.m. · Return leaves 11:05 a.m. · 2 h 5 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Found recently, and the cheapest we hold
$246 27 Dec – 7 Jan 2027found yesterdaySee prices for these dates
$218 28 Nov – 15 Decfound 6 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $158 to $220.
At $246, the cheapest return found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 11 departure dates from 26 Oct to 17 Feb 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 11-night return fares leaving within 3 days of 27 Dec to compare.
Every date we hold
15 fares on 11 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 26 Oct – 10 Nov | $285 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 10 Nov – 17 Nov | $240 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 14 Nov – 17 Nov | $246 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 15 Nov – 21 Nov | $227 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 28 Nov – 15 Dec | $218 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 27 Dec – 7 Jan 2027 | $246 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 23 Jan 2027 – 26 Jan 2027 | $260 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 26 Jan 2027 – 4 Feb 2027 | $228 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 5 Feb 2027 – 11 Feb 2027 | $249 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 9 Feb 2027 – 11 Feb 2027 | $226 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 17 Feb 2027 – 18 Feb 2027 | $295 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $218.
Airlines on the cheapest dates: Air Cambodia, Cambodia Airways.
One-way
The cheapest one-way fare on each of 8 departure dates is usually $136 to $150.
Cheapest one-way found recently
$140
4 Jan 2027 · Air Cambodia
Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS)
Leaves 3:00 p.m. · 1 h trip
nonstop
found yesterday
Cheapest nonstop one-way
$140
4 Jan 2027 · Air Cambodia
Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS)
Leaves 3:00 p.m. · 1 h trip
nonstop
found yesterday
Found recently, and the cheapest we hold
$140 4 Jan 2027found yesterdayOpen this trip
$124 5 Decfound 6 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $80 to $128.
At $140, the cheapest one-way found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 8 departure dates from 5 Dec to 12 Sept 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
No. We hold one-way fares on 2 other departure dates within 3 days of 4 Jan 2027, and none is cheaper.
Every date we hold
8 fares on 8 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 5 Dec | $124 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found 6 days ago | Open this trip |
| 1 Jan 2027 | $145 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found 2 days ago | Open this trip |
| 4 Jan 2027 | $140 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found yesterday | Open this trip |
| 5 Jan 2027 | $149 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found 4 days ago | Open this trip |
| 26 Jan 2027 | $153 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found 2 days ago | Open this trip |
| 14 Feb 2027 | $145 | Air Cambodia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found yesterday | Open this trip |
| 18 Feb 2027 | $124 | Cambodia Airways | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | nonstop | found 6 days ago | Open this trip |
| 12 Sept 2027 | $434 | Thai AirAsia | Siem Reap International Airport (SAI) → Sihanouk International Airport (KOS) | 2 stops | found 6 days ago | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $124.
Airlines on the cheapest dates: Air Cambodia, Cambodia Airways, Thai AirAsia.
Premium cabin fares from Siem Reap to Sihanoukville
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 27 Dec – 7 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 4 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Siem Reap to Sihanoukville?
Return
The cheapest fares were 7 to 13 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 7–13 days | $190 | $190 | Cheapest seen | 7 |
| 14–29 days | $210 | $190 | +10% | 22 |
| 30–59 days | $224 | $218 | +18% | 23 |
| 60–89 days | $227 | $201 | +20% | 25 |
| 90–179 days | $205 | $183 | +8% | 25 |
One-way
The cheapest fares were 0 to 6 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $96 | $80 | Cheapest seen | 20 |
| 7–13 days | $102 | $80 | +6% | 15 |
| 14–29 days | $115 | $109 | +20% | 7 |
| 30–59 days | $125 | $116 | +30% | 21 |
| 60–89 days | $124 | $116 | +29% | 25 |
| 90–179 days | $124 | $100 | +29% | 25 |
| 180+ days | $132 | $129 | +38% | 20 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Siem Reap → Phu Quoc
68 km from Sihanoukville
$439
$193 more than flying to Sihanoukville
9 Nov – 9 Nov · SAI → PQC · out 1 stop, back 2 stops
found yesterday
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Siem Reap → Phu Quoc
68 km from Sihanoukville
$95
$45 less than flying to Sihanoukville
20 Jan 2027 · SAI → PQC · nonstop
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 27 Dec – 7 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work