$610+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SAI
Aug 8 — Aug 151
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Last-minute
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 July 9, 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 July 9, 2026.
This oojo deal was found by Cheapflights users on 7/5. 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 8/261:45 am
BOS
- SAI
2 stops30h 10m
Multiple Airlines
Fri 9/119:40 am
SAI
- BOS
2 stops24h 25m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$1,149
This oojo deal was found by Cheapflights users on 7/6. 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 9/14:25 pm
BOS
- SAI
2 stops55h 50m
Multiple Airlines
Sat 10/33:10 pm
SAI
- BOS
2 stops34h 30m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$1,225
This oojo deal was found by Cheapflights users on 7/5. 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.
Thu 8/2712:44 pm
BOS
- SAI
3 stops33h 56m
Singapore Airlines
Fri 9/114:00 pm
SAI
- BOS
3 stops35h 59m
Singapore Airlines
Deal found 7/5![Singapore Airlines logo]()
$1,348
This Emirates deal was found by Cheapflights users on 7/6. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1011:05 pm
BOS
- SAI
2 stops26h 10m
Emirates
Sat 10/2411:50 pm
SAI
- BOS
2 stops49h 40m
Emirates
Deal found 7/6![Emirates logo]()
$1,365
This oojo deal was found by Cheapflights users on 7/6. 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 9/12:40 pm
BOS
- SAI
3 stops32h 00m
Singapore Airlines
Sat 10/310:30 am
SAI
- BOS
3 stops48h 24m
Singapore Airlines
Deal found 7/6![Singapore Airlines logo]()
$1,567
This Ovago deal was found by Cheapflights users on 7/5. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/264:25 pm
BOS
- SAI
2 stops39h 30m
Multiple Airlines
Sun 8/27:20 pm
SAI
- BOS
2 stops54h 20m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$1,617
This CheapOair deal was found by Cheapflights users on 7/6. 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.
Sat 8/224:40 pm
BOS
- SAI
2 stops31h 35m
Multiple Airlines
Sat 8/299:40 am
SAI
- BOS
2 stops39h 30m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$1,652
This CheapOair deal was found by Cheapflights users on 7/5. 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.
Mon 12/288:40 pm
BOS
- SAI
3 stops34h 05m
Lufthansa
Wed 1/64:45 pm
SAI
- BOS
2 stops33h 00m
Lufthansa
Deal found 7/5![Lufthansa logo]()
$1,748
This KAYAK deal was found by Cheapflights users on 7/5. 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.
Tue 12/298:40 pm
BOS
- SAI
2 stops34h 05m
Lufthansa
Wed 1/64:45 pm
SAI
- BOS
2 stops33h 00m
Lufthansa
Deal found 7/5![Lufthansa logo]()
$1,763
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 July 9, 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 July 9, 2026.
This EVA Air deal was found by Cheapflights users on 7/7. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/38:09 pm
BOS
- SAI
3 stops35h 46m
Multiple Airlines
Fri 8/219:40 am
SAI
- BOS
3 stops31h 48m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$1,886
This Qatar Airways deal was found by Cheapflights users on 7/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/310:00 pm
BOS
- SAI
2 stops27h 15m
Qatar Airways
Fri 8/219:40 am
SAI
- BOS
2 stops64h 35m
Qatar Airways
Deal found 7/8![Qatar Airways logo]()
$2,132
This KLM deal was found by Cheapflights users on 7/5. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2911:25 pm
BOS
- SAI
2 stops31h 20m
KLM
Tue 1/57:25 pm
SAI
- BOS
2 stops35h 36m
KLM
Deal found 7/5![KLM logo]()
$2,382
This British Airways deal was found by Cheapflights users on 7/5. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:45 pm
BOS
- SAI
2 stops36h 00m
British Airways
Fri 1/87:25 pm
SAI
- BOS
2 stops36h 15m
British Airways
Deal found 7/5![British Airways logo]()
$2,457
This Qatar Airways deal was found by Cheapflights users on 7/5. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/288:40 pm
BOS
- SAI
2 stops24h 35m
Qatar Airways
Sun 1/37:25 pm
SAI
- BOS
2 stops31h 05m
Qatar Airways
Deal found 7/5![Qatar Airways logo]()
$2,297
This Qatar Airways deal was found by Cheapflights users on 7/5. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/308:40 pm
BOS
- SAI
2 stops28h 00m
Qatar Airways
Sun 1/37:25 pm
SAI
- BOS
2 stops31h 05m
Qatar Airways
Deal found 7/5![Qatar Airways logo]()
$2,297
This British Airways deal was found by Cheapflights users on 7/5. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:45 pm
BOS
- SAI
2 stops36h 00m
British Airways
Tue 1/57:25 pm
SAI
- BOS
2 stops36h 15m
British Airways
Deal found 7/5![British Airways logo]()
$2,567
This KAYAK deal was found by Cheapflights users on 7/4. 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.
Sat 12/263:55 pm
BOS
- SAI
3 stops29h 20m
Qatar Airways
Sat 1/27:25 pm
SAI
- BOS
2 stops55h 05m
Qatar Airways
Deal found 7/4![Qatar Airways logo]()
$2,546
Last-minute flights from Boston to Siem ReapDiscover last-minute flight deals from Boston to Siem Reap. Data last updated July 9, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Siem Reap. Data last updated July 9, 2026 and is based on user searches.
This Ovago deal was found by Cheapflights users on 7/5. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/264:25 pm
BOS
- SAI
2 stops39h 30m
Multiple Airlines
Sun 8/27:20 pm
SAI
- BOS
2 stops54h 20m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$1,617
This EVA Air deal was found by Cheapflights users on 7/6. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/38:09 pm
BOS
- SAI
3 stops35h 46m
Multiple Airlines
Fri 8/219:40 am
SAI
- BOS
3 stops31h 48m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$1,781
This CheapOair deal was found by Cheapflights users on 7/6. 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.
Sat 8/224:40 pm
BOS
- SAI
2 stops31h 35m
Multiple Airlines
Sat 8/299:40 am
SAI
- BOS
2 stops39h 30m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$1,652
This KAYAK deal was found by Cheapflights users on 7/6. 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.
Sat 8/226:26 pm
BOS
- SAI
3 stops30h 49m
Qatar Airways
Sat 8/299:40 am
SAI
- BOS
2 stops40h 35m
Qatar Airways
Deal found 7/6![Qatar Airways logo]()
$1,921
This oojo deal was found by Cheapflights users on 7/5. 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 8/261:45 am
BOS
- SAI
2 stops30h 10m
Multiple Airlines
Fri 9/119:40 am
SAI
- BOS
2 stops24h 25m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$1,149
This oojo deal was found by Cheapflights users on 7/5. 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.
Thu 8/2712:44 pm
BOS
- SAI
3 stops33h 56m
Singapore Airlines
Fri 9/114:00 pm
SAI
- BOS
3 stops35h 59m
Singapore Airlines
Deal found 7/5![Singapore Airlines logo]()
$1,348
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 July 9, 2026.
Search for one-way flight options from Boston to Siem Reap. Find affordable one-way fares based on user searches. Data last updated July 9, 2026.
This Mytrip deal was found by Cheapflights users on 7/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/94:40 pm
BOS
- SAI
3 stops35h 10m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$610
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Wed 9/166:40 pm
BOS
- SAI
3 stops54h 35m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$624
This oojo deal was found by Cheapflights users on 7/8. 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 11/173:40 pm
BOS
- SAI
2 stops42h 05m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$634
This FlightHub deal was found by Cheapflights users on 7/8. 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 11/171:00 pm
BOS
- SAI
3 stops38h 55m
Singapore Airlines
Deal found 7/8![Singapore Airlines logo]()
$665
This Ovago deal was found by Cheapflights users on 7/8. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:26 pm
BOS
- SAI
2 stops30h 49m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$738
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Tue 8/44:40 pm
BOS
- SAI
3 stops34h 40m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$788
This FlightHub deal was found by Cheapflights users on 7/5. 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.
Sat 1/28:00 pm
BOS
- SAI
2 stops24h 45m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$866
This oojo deal was found by Cheapflights users on 7/6. 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.
Sun 12/273:40 pm
BOS
- SAI
2 stops55h 15m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$905
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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,149 (oojo) |
One-way from | $610 (Mytrip) |
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 9, 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 - SAI
BOSSAI
Boston Logan Intl
Mon 8/3
8:09 pm-6:55 pm
3 stops35h 46m
Siem Reap–Angkor Intl
Fri 8/21
9:40 am-6:28 am
3 stops31h 48m
$1,886
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Mon 8/3
10:00 pm-12:15 pm
2 stops27h 15m
Siem Reap–Angkor Intl
Fri 8/21
9:40 am-3:15 pm
2 stops64h 35m
$2,132
Quickest round-trip
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Mon 12/28
8:40 pm-9:15 am
2 stops24h 35m
Siem Reap–Angkor Intl
Sun 1/3
7:25 pm-2:30 pm
2 stops31h 05m
$2,297
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Wed 12/30
8:40 pm-12:40 pm
2 stops28h 00m
Siem Reap–Angkor Intl
Sun 1/3
7:25 pm-2:30 pm
2 stops31h 05m
$2,297
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Tue 12/29
11:25 pm-6:45 pm
2 stops31h 20m
Siem Reap–Angkor Intl
Tue 1/5
7:25 pm-7:01 pm
2 stops35h 36m
$2,382
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Fri 12/25
6:45 pm-6:45 pm
2 stops36h 00m
Siem Reap–Angkor Intl
Fri 1/8
7:25 pm-7:40 pm
2 stops36h 15m
$2,457
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Sat 12/26
3:55 pm-9:15 am
3 stops29h 20m
Siem Reap–Angkor Intl
Sat 1/2
7:25 pm-2:30 pm
2 stops55h 05m
$2,546
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Fri 12/25
6:45 pm-6:45 pm
2 stops36h 00m
Siem Reap–Angkor Intl
Tue 1/5
7:25 pm-7:40 pm
2 stops36h 15m
$2,567
Cheapest one-way
Quickest one-way
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Sun 8/9
4:40 pm-2:50 pm
3 stops35h 10m
$610
BostonSiem Reap
BOS - SAI
BOSSAI
Boston Logan Intl
Tue 11/17
3:40 pm-9:45 pm
2 stops42h 05m
$634
Showing 1-10 of 13 resultsSorted 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.
| 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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Complete your trip
Flights by cabin class
Other flight options
Other flights from Boston
Popular flights