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Cheap flights from Boston to Siem Reap from $603

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 11/1. 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

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
4:40 pm - 9:00 amBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
53h 20m2 stops Abu Dhabi Zayed Intl Phnom Penh Techo Intl
Multiple Airlines Logo
1:00 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
60h 10m2 stops Phnom Penh Techo Intl Abu Dhabi Zayed Intl
$1,151Multiple Airlines
Thu, Sep 10 - Sun, Sep 27
Multiple Airlines Logo
1:45 am - 6:55 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
30h 10m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
7:35 pm - 11:05 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
38h 30m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$1,172Multiple Airlines
Tue, Sep 15 - Sun, Sep 20
Emirates Logo
11:05 pm - 9:30 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
35h 25m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
11:50 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
49h 20m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,250Emirates
Tue, Sep 8 - Thu, Sep 24
Emirates Logo
11:05 pm - 12:15 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
26h 10m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
11:50 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
49h 20m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,280Emirates
Mon, Sep 7 - Thu, Sep 24
Lufthansa Logo
8:05 pm - 6:55 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
35h 50m2 stops Munich Franz Josef Strauss Bangkok Suvarnabhumi
Lufthansa Logo
4:00 pm - 3:40 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
34h 40m2 stops Singapore Changi Frankfurt am Main
$1,290Lufthansa
Sun, Sep 13 - Wed, Sep 30
Emirates Logo
11:05 pm - 9:30 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
35h 25m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
11:50 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
49h 20m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,300Emirates
Thu, Sep 10 - Thu, Sep 24
Emirates Logo
11:05 pm - 12:15 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
26h 10m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
12:55 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
36h 15m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,310Emirates
Mon, Sep 7 - Fri, Sep 25
Emirates Logo
10:10 pm - 12:40 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
26h 30m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
11:50 pm - 1:55 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
50h 05m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,315Emirates
Mon, Nov 9 - Sat, Nov 21
Emirates Logo
11:05 pm - 9:30 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
35h 25m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
12:55 pm - 2:10 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
36h 15m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,330Emirates
Tue, Sep 8 - Sun, Sep 27
Emirates Logo
10:10 pm - 9:10 pmBOS  Boston Logan Intl-SAI Siem Reap–Angkor Intl
35h 00m2 stops Dubai Intl Bangkok Suvarnabhumi
Emirates Logo
11:50 pm - 1:55 pmSAI  Siem Reap–Angkor Intl-BOS Boston Logan Intl
50h 05m2 stops Bangkok Suvarnabhumi Dubai Intl
$1,335Emirates
Thu, Nov 12 - Sat, Nov 21

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Emirates flights from Boston to Siem Reap

Our best Emirates deals on Boston to Siem Reap flight tickets
Emirates
Sep 8
BOS11:05 pmBoston Logan Intl
35h 25m
2 stops
SAI9:30 pmSiem Reap–Angkor Intl
Sep 24
SAI11:50 pmSiem Reap–Angkor Intl
49h 20m
2 stops
BOS2:10 pmBoston Logan Intl
$1,250
Emirates
Sep 7
BOS11:05 pmBoston Logan Intl
26h 10m
2 stops
SAI12:15 pmSiem Reap–Angkor Intl
Sep 24
SAI11:50 pmSiem Reap–Angkor Intl
49h 20m
2 stops
BOS2:10 pmBoston Logan Intl
$1,280
Emirates
Sep 10
BOS11:05 pmBoston Logan Intl
35h 25m
2 stops
SAI9:30 pmSiem Reap–Angkor Intl
Sep 24
SAI11:50 pmSiem Reap–Angkor Intl
49h 20m
2 stops
BOS2:10 pmBoston Logan Intl
$1,300

Lufthansa flights from Boston to Siem Reap

Our best Lufthansa deals on Boston to Siem Reap flight tickets
Lufthansa
Sep 13
BOS8:05 pmBoston Logan Intl
35h 50m
2 stops
SAI6:55 pmSiem Reap–Angkor Intl
Sep 30
SAI4:00 pmSiem Reap–Angkor Intl
34h 40m
2 stops
BOS3:40 pmBoston Logan Intl
$1,290
Lufthansa
Sep 8
BOS8:05 pmBoston Logan Intl
35h 50m
2 stops
SAI6:55 pmSiem Reap–Angkor Intl
Sep 30
SAI4:00 pmSiem Reap–Angkor Intl
39h 10m
2 stops
BOS8:10 pmBoston Logan Intl
$1,365
Lufthansa
Sep 9
BOS8:05 pmBoston Logan Intl
50h 35m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
Sep 30
SAI4:00 pmSiem Reap–Angkor Intl
34h 40m
2 stops
BOS3:40 pmBoston Logan Intl
$1,375

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 August 17, 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 Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Thu 9/10

4:40 pm-9:00 am

2 stops53h 20m

Siem Reap–Angkor Intl

Sun 9/27

1:00 pm-2:10 pm

2 stops60h 10m

$1,151

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Tue 9/15

1:45 am-6:55 pm

2 stops30h 10m

Siem Reap–Angkor Intl

Sun 9/20

7:35 pm-11:05 pm

2 stops38h 30m

$1,172

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Tue 9/8

11:05 pm-9:30 pm

2 stops35h 25m

Siem Reap–Angkor Intl

Thu 9/24

11:50 pm-2:10 pm

2 stops49h 20m

$1,250

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Mon 9/7

11:05 pm-12:15 pm

2 stops26h 10m

Siem Reap–Angkor Intl

Thu 9/24

11:50 pm-2:10 pm

2 stops49h 20m

$1,280

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Sun 9/13

8:05 pm-6:55 pm

2 stops35h 50m

Siem Reap–Angkor Intl

Wed 9/30

4:00 pm-3:40 pm

2 stops34h 40m

$1,290

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Thu 9/10

11:05 pm-9:30 pm

2 stops35h 25m

Siem Reap–Angkor Intl

Thu 9/24

11:50 pm-2:10 pm

2 stops49h 20m

$1,300
Quickest round-trip

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Mon 9/7

11:05 pm-12:15 pm

2 stops26h 10m

Siem Reap–Angkor Intl

Fri 9/25

12:55 pm-2:10 pm

2 stops36h 15m

$1,310

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Mon 11/9

10:10 pm-12:40 pm

2 stops26h 30m

Siem Reap–Angkor Intl

Sat 11/21

11:50 pm-1:55 pm

2 stops50h 05m

$1,315

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Tue 9/8

11:05 pm-9:30 pm

2 stops35h 25m

Siem Reap–Angkor Intl

Sun 9/27

12:55 pm-2:10 pm

2 stops36h 15m

$1,330

BostonSiem Reap

BOS Boston Logan Intl - SAI Siem Reap–Angkor Intl

BOSSAI

Boston Logan Intl

Thu 11/12

10:10 pm-9:10 pm

2 stops35h 00m

Siem Reap–Angkor Intl

Sat 11/21

11:50 pm-1:55 pm

2 stops50h 05m

$1,335

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Siem Reap from

How to get the cheapest flight ticket from Boston to Siem Reap

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Boston Logan Intl to Siem Reap–Angkor Intl?

Singapore Airlines is the most popular carrier operating from Boston Logan Intl to Siem Reap–Angkor Intl

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

Best Price Found

$603

Fastest flight time

27h 25m

Direct flights

None
The best one-way flight to Siem Reap from Boston in the past 72 hours is $603. The best round-trip flight deal from Boston to Siem Reap found on momondo in the last 72 hours is $1,151.
The fastest flight from Boston to Siem Reap takes 27h 25m
There are no direct flights from Boston to Siem Reap. There are no popular flight routes from Boston to Siem Reap.
Search flight deals

Frequently asked questions about flying from Boston to Siem Reap

  • 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. 27h 25m 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.

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