$592+ Cheap flights from Boston (BOS) to Siem Reap, Cambodia (SAI)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SAI
Oct 18 — Oct 251
Round-trip
1 adult, Economy
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Find cheap flights from Boston to Siem Reap with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Boston to Siem Reap
Cheapest
Best
One-way
Cheapest flights from Boston to Siem ReapExplore 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 September 18, 2026.
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 September 18, 2026.
This oojo deal was found by Cheapflights users on 9/17. 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 11/98:40 pm -
2 stops35h 50m
Sat 11/219:30 pm -
2 stops52h 25m
Deal found 9/17![Multiple Airlines logo]()
$1,383
This Justfly.com deal was found by Cheapflights users on 9/17. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/94:10 pm -
3 stops29h 45m
Sat 11/2110:45 am -
3 stops42h 46m
Deal found 9/17![Singapore Airlines logo]()
$1,445
This KAYAK deal was found by Cheapflights users on 9/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1510:10 pm -
2 stops35h 00m
Sat 11/2811:50 pm -
2 stops26h 05m
Deal found 9/17![Emirates logo]()
$1,456
This Expedia deal was found by Cheapflights users on 9/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/154:05 pm -
2 stops29h 50m
Sat 11/2811:50 pm -
3 stops56h 30m
Deal found 9/17![Multiple Airlines logo]()
$1,719
Best flights from Boston to Siem ReapDiscover carefully curated flight deals from Boston to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
Discover carefully curated flight deals from Boston to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
This oojo deal was found by Cheapflights users on 9/17. 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 11/98:40 pm -
2 stops35h 50m
Sat 11/219:30 pm -
2 stops52h 25m
Deal found 9/17![Multiple Airlines logo]()
$1,383
This KAYAK deal was found by Cheapflights users on 9/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1510:10 pm -
2 stops35h 00m
Sat 11/2811:50 pm -
2 stops26h 05m
Deal found 9/17![Emirates logo]()
$1,456
This Globehunters deal was found by Cheapflights users on 9/15. 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/212:30 am -
2 stops30h 15m
Mon 1/119:55 am -
2 stops24h 05m
Deal found 9/15![Multiple Airlines logo]()
$1,402
This Globehunters deal was found by Cheapflights users on 9/15. 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/212:30 am -
2 stops30h 15m
Sat 1/169:55 am -
2 stops24h 05m
Deal found 9/15![Multiple Airlines logo]()
$1,452
This Expedia deal was found by Cheapflights users on 9/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/154:05 pm -
2 stops29h 50m
Sat 11/2811:50 pm -
3 stops56h 30m
Deal found 9/17![Multiple Airlines logo]()
$1,719
One-way flights from Boston to Siem ReapSearch for one-way flight options from Boston to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
Search for one-way flight options from Boston to Siem Reap. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
This oojo deal was found by Cheapflights users on 9/17. 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.
Wed 12/303:40 pm -
2 stops53h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Multiple Airlines logo]()
$592
This oojo deal was found by Cheapflights users on 9/18. 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.
Tue 11/171:00 pm -
3 stops39h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Singapore Airlines logo]()
$663
This FlightHub deal was found by Cheapflights users on 9/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/178:00 pm -
2 stops24h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$731
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/155:25 pm -
3 stops51h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$1,207
This FlightHub deal was found by Cheapflights users on 9/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/1511:30 am -
2 stops34h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Singapore Airlines logo]()
$1,620
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 September 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,383 (oojo) |
One-way from | $592 (oojo) |
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 7,457,451 searches. Data last updated September 18, 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
Cheapest round-trip
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Wed 12/30
3:40 pm-8:50 am
2 stops53h 10m
Siem Reap–Angkor Intl
Wed 12/31
12:00 am-12:00 pm
Nonstop0h 00m
$592
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Tue 11/17
1:00 pm-4:00 pm
3 stops39h 00m
Siem Reap–Angkor Intl
Wed 12/31
12:00 am-12:00 pm
Nonstop0h 00m
$663
Quickest round-trip
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Tue 11/17
8:00 pm-8:45 am
2 stops24h 45m
Siem Reap–Angkor Intl
Wed 12/31
12:00 am-12:00 pm
Nonstop0h 00m
$731
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Mon 11/9
8:40 pm-8:30 pm
2 stops35h 50m
Siem Reap–Angkor Intl
Sat 11/21
9:30 pm-1:55 pm
2 stops52h 25m
$1,383
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Sat 1/2
12:30 am-6:45 pm
2 stops30h 15m
Siem Reap–Angkor Intl
Mon 1/11
9:55 am-10:00 pm
2 stops24h 05m
$1,402
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Sat 1/2
12:30 am-6:45 pm
2 stops30h 15m
Siem Reap–Angkor Intl
Sat 1/16
9:55 am-10:00 pm
2 stops24h 05m
$1,452
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Sun 11/15
10:10 pm-9:10 pm
2 stops35h 00m
Siem Reap–Angkor Intl
Sat 11/28
11:50 pm-1:55 pm
2 stops26h 05m
$1,456
BostonSiem Reap
BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl
BOSSAI
Boston Logan Intl
Sun 11/15
4:05 pm-9:55 am
2 stops29h 50m
Siem Reap–Angkor Intl
Sat 11/28
11:50 pm-8:20 pm
3 stops56h 30m
$1,719
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
BOS-SAI
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.
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