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Cheap flights from Boston to Siem Reap from $634

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Siem Reap departing on 5/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Boston to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
8:00 am - 9:50 am
BOS
-
SAI
61h 50m
2 stops
United Airlines Logo
10:45 am - 7:56 pm
SAI
-
BOS
45h 11m
2 stops
$993United Airlines
Sun, Feb 22 - Mon, Mar 2
Multiple Airlines Logo
4:25 pm - 6:45 pm
BOS
-
SAI
39h 20m
2 stops
Multiple Airlines Logo
12:55 pm - 2:40 pm
SAI
-
BOS
60h 45m
2 stops
$1,035Multiple Airlines
Tue, Apr 21 - Sun, Apr 26
United Airlines Logo
5:50 pm - 3:55 pm
BOS
-
SAI
58h 05m
2 stops
United Airlines Logo
10:45 am - 9:47 pm
SAI
-
BOS
47h 02m
2 stops
$1,044United Airlines
Sat, Feb 21 - Mon, Mar 2
Multiple Airlines Logo
4:40 pm - 9:10 pm
BOS
-
SAI
41h 30m
2 stops
Multiple Airlines Logo
11:50 pm - 3:10 pm
SAI
-
BOS
50h 20m
2 stops
$1,072Multiple Airlines
Tue, Mar 10 - Tue, Mar 17
Singapore Airlines Logo
2:10 pm - 3:55 pm
BOS
-
SAI
38h 45m
3 stops
Singapore Airlines Logo
10:45 am - 9:25 pm
SAI
-
BOS
45h 40m
3 stops
$1,155Singapore Airlines
Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
4:25 pm - 9:00 am
BOS
-
SAI
29h 35m
2 stops
Multiple Airlines Logo
7:25 pm - 2:40 pm
SAI
-
BOS
30h 15m
2 stops
$1,174Multiple Airlines
Thu, Apr 9 - Thu, Apr 23
United Airlines Logo
8:00 am - 9:50 am
BOS
-
SAI
61h 50m
2 stops
United Airlines Logo
4:45 pm - 7:58 am
SAI
-
BOS
27h 13m
2 stops
$1,178United Airlines
Sun, Feb 22 - Tue, Mar 3
Malaysia Airlines Logo
8:40 pm - 10:00 am
BOS
-
SAI
49h 20m
2 stops
Malaysia Airlines Logo
11:00 am - 1:55 pm
SAI
-
BOS
38h 55m
2 stops
$1,185Malaysia Airlines
Sat, Feb 21 - Tue, Mar 3
Singapore Airlines Logo
5:38 pm - 3:55 pm
BOS
-
SAI
35h 17m
3 stops
Singapore Airlines Logo
10:45 am - 11:50 pm
SAI
-
BOS
48h 05m
3 stops
$1,220Singapore Airlines
Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
4:40 pm - 10:50 am
BOS
-
SAI
55h 10m
2 stops
Multiple Airlines Logo
4:50 pm - 3:10 pm
SAI
-
BOS
33h 20m
3 stops
$1,225Multiple Airlines
Tue, Mar 10 - Tue, Mar 17

Singapore Airlines flights from Boston to Siem Reap

Our best Singapore Airlines deals on Boston to Siem Reap flight tickets
Singapore Airlines
Mar 10
BOS2:10 pmBoston Logan Intl
38h 45m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 17
SAI10:45 amSiem Reap–Angkor Intl
45h 40m
3 stops
BOS9:25 pmBoston Logan Intl
$1,155
Singapore Airlines
Mar 10
BOS5:38 pmBoston Logan Intl
35h 17m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 17
SAI10:45 amSiem Reap–Angkor Intl
48h 05m
3 stops
BOS11:50 pmBoston Logan Intl
$1,220
Singapore Airlines
Mar 10
BOS5:38 pmBoston Logan Intl
35h 17m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 17
SAI4:45 pmSiem Reap–Angkor Intl
42h 13m
2 stops
BOS11:58 pmBoston Logan Intl
$1,379

United Airlines flights from Boston to Siem Reap

Our best United Airlines deals on Boston to Siem Reap flight tickets
United Airlines
Feb 22
BOS8:00 amBoston Logan Intl
61h 50m
2 stops
SAI9:50 amSiem Reap–Angkor Intl
Mar 2
SAI10:45 amSiem Reap–Angkor Intl
45h 11m
2 stops
BOS7:56 pmBoston Logan Intl
$993
United Airlines
Feb 21
BOS5:50 pmBoston Logan Intl
58h 05m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 2
SAI10:45 amSiem Reap–Angkor Intl
47h 02m
2 stops
BOS9:47 pmBoston Logan Intl
$1,044
United Airlines
Feb 22
BOS8:00 amBoston Logan Intl
61h 50m
2 stops
SAI9:50 amSiem Reap–Angkor Intl
Mar 3
SAI4:45 pmSiem Reap–Angkor Intl
27h 13m
2 stops
BOS7:58 amBoston Logan Intl
$1,178

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Siem Reap that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 11, 2026.
Use the filters below to find and compare flights from Boston to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sun 2/22

8:00 am-9:50 am

2 stops61h 50m

Siem Reap–Angkor Intl

Mon 3/2

10:45 am-7:56 pm

2 stops45h 11m

$993

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 4/21

4:25 pm-6:45 pm

2 stops39h 20m

Siem Reap–Angkor Intl

Sun 4/26

12:55 pm-2:40 pm

2 stops60h 45m

$1,035

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sat 2/21

5:50 pm-3:55 pm

2 stops58h 05m

Siem Reap–Angkor Intl

Mon 3/2

10:45 am-9:47 pm

2 stops47h 02m

$1,044

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 3/10

4:40 pm-9:10 pm

2 stops41h 30m

Siem Reap–Angkor Intl

Tue 3/17

11:50 pm-3:10 pm

2 stops50h 20m

$1,072

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 3/10

2:10 pm-3:55 pm

3 stops38h 45m

Siem Reap–Angkor Intl

Tue 3/17

10:45 am-9:25 pm

3 stops45h 40m

$1,155

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Thu 4/9

4:25 pm-9:00 am

2 stops29h 35m

Siem Reap–Angkor Intl

Thu 4/23

7:25 pm-2:40 pm

2 stops30h 15m

$1,174

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sun 2/22

8:00 am-9:50 am

2 stops61h 50m

Siem Reap–Angkor Intl

Tue 3/3

4:45 pm-7:58 am

2 stops27h 13m

$1,178

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sat 2/21

8:40 pm-10:00 am

2 stops49h 20m

Siem Reap–Angkor Intl

Tue 3/3

11:00 am-1:55 pm

2 stops38h 55m

$1,185

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 3/10

5:38 pm-3:55 pm

3 stops35h 17m

Siem Reap–Angkor Intl

Tue 3/17

10:45 am-11:50 pm

3 stops48h 05m

$1,220

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 3/10

4:40 pm-10:50 am

2 stops55h 10m

Siem Reap–Angkor Intl

Tue 3/17

4:50 pm-3:10 pm

3 stops33h 20m

$1,225

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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When to book flights from Boston to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to Siem Reap (BOS to SAI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Siem Reap

Fastest flight time

38h 45m

Direct flights

None
The fastest flight from Boston to Siem Reap takes 38h 45m
There are no direct flights from Boston to Siem Reap. There are no popular flight routes from Boston to Siem Reap.
Search flight deals

  • How far is Boston Logan Intl to Siem Reap–Angkor Intl by plane?

    Boston Logan Intl and Siem Reap–Angkor Intl are 8567.5 mi apart from one another. 38h 45m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Siem Reap–Angkor Intl Airport?

    Prices for flights from Boston Logan Intl Airport to Siem Reap–Angkor Intl Airport were last updated today.

  • How old do you have to be to fly from Boston Logan Intl Airport to Siem Reap–Angkor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Siem Reap–Angkor Intl Airport.

  • What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

    The travel and health documents you'll need for your trip to Siem Reap–Angkor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Boston to Siem Reap?

    Search flight deals from Boston to Siem Reap. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from Boston to Siem Reap with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Siem Reap?

It is quick and easy to find Boston to Siem Reap flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Siem Reap that suits you.

Can I find flights from Boston to Siem Reap with flexible booking policies on momondo?

Flights from Boston to Siem Reap with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Boston to Siem Reap?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Siem Reap from Boston.

I’m not ready to book a flight from Boston to Siem Reap right now. Can momondo alert me if prices change?

Price alerts on flights to Siem Reap from Boston are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cabin classes currently available on flights to Siem Reap

List of cabin classes available on flights landing in Siem Reap. Availability may vary depending on flight origin and airline.
First Class to Siem Reap
Business Class to Siem Reap