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Cheap flights from Boston to Siem Reap from $586

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 5/21. 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
1 adult, Economy, 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.
Multiple Airlines Logo
4:25 pm - 9:05 am
BOS
-
SAI
29h 40m
2 stops
Multiple Airlines Logo
7:20 pm - 2:40 pm
SAI
-
BOS
54h 20m
2 stops
$1,227Multiple Airlines
Fri, May 22 - Sun, May 31
Multiple Airlines Logo
4:25 pm - 11:15 am
BOS
-
SAI
31h 50m
2 stops
Multiple Airlines Logo
1:05 pm - 2:40 pm
SAI
-
BOS
36h 35m
2 stops
$1,241Multiple Airlines
Wed, May 20 - Wed, May 27
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
11:50 pm - 2:10 pm
SAI
-
BOS
49h 20m
2 stops
$1,303Emirates
Mon, May 18 - Thu, May 28
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
11:50 pm - 2:10 pm
SAI
-
BOS
49h 20m
2 stops
$1,327Emirates
Mon, May 18 - Tue, May 26
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
1:05 pm - 2:10 pm
SAI
-
BOS
36h 05m
2 stops
$1,329Emirates
Mon, May 18 - Wed, May 27
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
11:50 pm - 2:10 pm
SAI
-
BOS
49h 20m
2 stops
$1,353Emirates
Sat, May 23 - Thu, May 28
Etihad Airways Logo
4:25 pm - 12:20 pm
BOS
-
SAI
32h 55m
2 stops
Etihad Airways Logo
7:30 pm - 2:40 pm
SAI
-
BOS
30h 10m
2 stops
$1,364Etihad Airways
Tue, May 19 - Thu, May 28
Emirates Logo
11:05 pm - 9:30 pm
BOS
-
SAI
35h 25m
2 stops
Emirates Logo
11:50 pm - 2:10 pm
SAI
-
BOS
49h 20m
2 stops
$1,366Emirates
Sun, May 17 - Thu, May 28
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
11:50 pm - 2:10 pm
SAI
-
BOS
49h 20m
2 stops
$1,377Emirates
Sat, May 23 - Tue, May 26
Emirates Logo
11:05 pm - 12:20 pm
BOS
-
SAI
26h 15m
2 stops
Emirates Logo
1:05 pm - 2:10 pm
SAI
-
BOS
36h 05m
2 stops
$1,379Emirates
Mon, May 18 - Sun, May 24

Qatar Airways flights from Boston to Siem Reap

Our best Qatar Airways deals on Boston to Siem Reap flight tickets
Qatar Airways
Aug 3
BOS8:43 amBoston Logan Intl
37h 17m
3 stops
SAI9:00 amSiem Reap–Angkor Intl
Aug 21
SAI7:30 pmSiem Reap–Angkor Intl
30h 45m
2 stops
BOS3:15 pmBoston Logan Intl
$1,684
Qatar Airways
Aug 3
BOS8:43 amBoston Logan Intl
37h 17m
3 stops
SAI9:00 amSiem Reap–Angkor Intl
Aug 21
SAI7:30 pmSiem Reap–Angkor Intl
30h 45m
2 stops
BOS3:15 pmBoston Logan Intl
$1,685
Qatar Airways
Aug 3
BOS8:43 amBoston Logan Intl
37h 17m
3 stops
SAI9:00 amSiem Reap–Angkor Intl
Aug 21
SAI9:40 amSiem Reap–Angkor Intl
40h 35m
2 stops
BOS3:15 pmBoston Logan Intl
$1,740

Emirates flights from Boston to Siem Reap

Our best Emirates deals on Boston to Siem Reap flight tickets
Emirates
May 18
BOS11:05 pmBoston Logan Intl
26h 15m
2 stops
SAI12:20 pmSiem Reap–Angkor Intl
May 28
SAI11:50 pmSiem Reap–Angkor Intl
49h 20m
2 stops
BOS2:10 pmBoston Logan Intl
$1,303
Emirates
May 18
BOS11:05 pmBoston Logan Intl
26h 15m
2 stops
SAI12:20 pmSiem Reap–Angkor Intl
May 26
SAI11:50 pmSiem Reap–Angkor Intl
49h 20m
2 stops
BOS2:10 pmBoston Logan Intl
$1,327
Emirates
May 18
BOS11:05 pmBoston Logan Intl
26h 15m
2 stops
SAI12:20 pmSiem Reap–Angkor Intl
May 25
SAI1:05 pmSiem Reap–Angkor Intl
36h 05m
2 stops
BOS2:10 pmBoston Logan Intl
$1,329

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 March 28, 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

Cheapest round-trip

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Fri 5/22

4:25 pm-9:05 am

2 stops29h 40m

Siem Reap–Angkor Intl

Sun 5/31

7:20 pm-2:40 pm

2 stops54h 20m

$1,227

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Wed 5/20

4:25 pm-11:15 am

2 stops31h 50m

Siem Reap–Angkor Intl

Wed 5/27

1:05 pm-2:40 pm

2 stops36h 35m

$1,241

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Mon 5/18

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Thu 5/28

11:50 pm-2:10 pm

2 stops49h 20m

$1,303

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Mon 5/18

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Tue 5/26

11:50 pm-2:10 pm

2 stops49h 20m

$1,327
Quickest round-trip

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Mon 5/18

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Wed 5/27

1:05 pm-2:10 pm

2 stops36h 05m

$1,329

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sat 5/23

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Thu 5/28

11:50 pm-2:10 pm

2 stops49h 20m

$1,353

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 5/19

4:25 pm-12:20 pm

2 stops32h 55m

Siem Reap–Angkor Intl

Thu 5/28

7:30 pm-2:40 pm

2 stops30h 10m

$1,364

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sun 5/17

11:05 pm-9:30 pm

2 stops35h 25m

Siem Reap–Angkor Intl

Thu 5/28

11:50 pm-2:10 pm

2 stops49h 20m

$1,366

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Sat 5/23

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Tue 5/26

11:50 pm-2:10 pm

2 stops49h 20m

$1,377

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Mon 5/18

11:05 pm-12:20 pm

2 stops26h 15m

Siem Reap–Angkor Intl

Sun 5/24

1:05 pm-2:10 pm

2 stops36h 05m

$1,379

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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

26h 10m

Direct flights

None
The fastest flight from Boston to Siem Reap takes 26h 10m
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. 26h 10m 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