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Siem Reap

$653+ Cheap flights from Boston (BOS) to Siem Reap, Cambodia (SAI)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SAI
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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Cheap flight deals from Boston to Siem Reap

Cheapest flights from Boston to Siem Reap
Explore the most affordable flight options available from Boston to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.

This SmartFares deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:40 pm
BOS
-
SAI
2 stops31h 15m
Multiple Airlines
Mon 11/167:10 pm
SAI
-
BOS
2 stops55h 00m
Multiple Airlines
Deal found 7/21$1,131
This SmartFares deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/274:40 pm
BOS
-
SAI
2 stops55h 15m
Multiple Airlines
Sat 11/72:10 pm
SAI
-
BOS
2 stops36h 00m
Multiple Airlines
Deal found 7/20$1,171
This Trip.com deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/254:40 pm
BOS
-
SAI
2 stops31h 30m
Multiple Airlines
Sun 8/3011:55 am
SAI
-
BOS
2 stops61h 15m
Multiple Airlines
Deal found 7/21$1,311
This oojo deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/34:40 pm
BOS
-
SAI
2 stops31h 35m
Multiple Airlines
Fri 8/213:10 pm
SAI
-
BOS
2 stops58h 00m
Multiple Airlines
Deal found 7/19$1,421
This CheapOair deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:37 pm
BOS
-
SAI
3 stops36h 08m
Lufthansa
Mon 11/164:45 pm
SAI
-
BOS
2 stops33h 00m
Lufthansa
Deal found 7/21$1,487

Find flight deals from Boston to Siem Reap

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Siem Reap (SAI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,131
(SmartFares)

One-way from

$653
(oojo)
Provider with most accurate pricing for Boston Logan Intl-Siem Reap–Angkor Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Siem Reap–Angkor Intl flights.
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From Boston Logan Intl to Siem Reap–Angkor Intl
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One-way flight from Boston Logan Intl to Siem Reap–Angkor Intl
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Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 23, 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

Tue 10/27

4:40 pm-10:55 am

2 stops55h 15m

Siem Reap–Angkor Intl

Sat 11/7

2:10 pm-2:10 pm

2 stops36h 00m

$1,171

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 8/25

4:40 pm-11:10 am

2 stops31h 30m

Siem Reap–Angkor Intl

Sun 8/30

11:55 am-2:10 pm

2 stops61h 15m

$1,311

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Mon 8/3

4:40 pm-11:15 am

2 stops31h 35m

Siem Reap–Angkor Intl

Fri 8/21

3:10 pm-2:10 pm

2 stops58h 00m

$1,421
Quickest round-trip

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Wed 10/28

9:40 pm-6:45 pm

3 stops34h 05m

Siem Reap–Angkor Intl

Mon 11/16

4:45 pm-8:20 pm

2 stops39h 35m

$1,503
Cheapest one-way

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 11/17

3:40 pm-9:45 pm

2 stops42h 05m

$653

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 11/17

1:00 pm-3:55 pm

3 stops38h 55m

$665
Quickest one-way

BostonSiem Reap

BOS - SAI

BOSSAI

Boston Logan Intl

Tue 9/15

9:30 am-9:40 am

2 stops37h 10m

$1,381

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/19

Sorted by cheapest first

Compare providers for flights from Boston to Siem Reap

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Siem Reap in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Siem Reap flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Siem Reap flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Siem Reap flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Siem Reap flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Boston to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Boston to Siem Reap that include hotel bookings?

    Yes. In addition to deals on Boston to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Siem Reap?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Siem Reap.

  • Can I find deals for business class flights from Boston to Siem Reap?

    Yes. Cheapflights offers flight deals from Boston to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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