Boston to Siem Reap BOS → SAI
Logan International Airport (BOS) → Siem Reap International Airport (SAI)
The cheapest one-way found recently is $654 with Hainan Airlines, 5 Sept 2027, found 4 days ago.
One-way
The cheapest one-way fare on each of 9 departure dates is usually $703 to $732.
Cheapest one-way found recently
$654
5 Sept 2027 · Hainan Airlines
Logan International Airport (BOS) → Siem Reap International Airport (SAI)
Leaves 11:55 p.m. · 31 h 50 min trip
2 stops
found 4 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$654 5 Sept 2027found 4 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 4 days, 15 Oct to 18 Oct, the cheapest one-way we saw each day was $654.
At $654, the cheapest one-way found recently costs the same.
4 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 9 departure dates from 15 Jun 2027 to 7 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 3 other departure dates within 3 days of 5 Sept 2027, and none is cheaper.
Every date we hold
9 fares on 9 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 15 Jun 2027 | $889 | Korean Air | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 20 Jun 2027 | $916 | Cathay Pacific | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 24 Aug 2027 | $712 | United Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 29 Aug 2027 | $703 | Hainan Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 1 Sept 2027 | $703 | Hainan Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 4 Sept 2027 | $721 | Alaska Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 3 stops | found 4 days ago | Open this trip |
| 5 Sept 2027 | $654 | Hainan Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
| 6 Sept 2027 | $720 | Alaska Airlines | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 3 stops | found 4 days ago | Open this trip |
| 7 Sept 2027 | $732 | Korean Air | Logan International Airport (BOS) → Siem Reap International Airport (SAI) | 2 stops | found 4 days ago | Open this trip |
Which month looks cheapest?
September 2027 is the cheapest month — from $654.
Airlines on the cheapest dates: Hainan Airlines, Korean Air, Alaska Airlines, Cathay Pacific, United Airlines.
Premium cabin fares from Boston to Siem Reap
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 5 Sept 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Boston to Siem Reap?
One-way
Not enough history yet: we have 4 days of one-way prices, 15 Oct to 18 Oct, and compare booking times once 3 booking ranges have 7 days each.
Live price for these dates
The cheapest one-way found recently is for 5 Sept 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