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Cheap flights from Portland to Siem Reap from $624

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Siem Reap departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Portland to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:20 am - 9:40 am
PDX
-
SAI
37h 20m
2 stops
Multiple Airlines Logo
10:30 am - 1:37 pm
SAI
-
PDX
41h 07m
2 stops
$1,043Multiple Airlines
Tue, Sep 22 - Mon, Sep 28
Multiple Airlines Logo
9:35 pm - 9:40 am
PDX
-
SAI
46h 05m
2 stops
Multiple Airlines Logo
10:30 am - 1:37 pm
SAI
-
PDX
41h 07m
2 stops
$1,116Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
7:03 am - 9:40 am
PDX
-
SAI
36h 37m
2 stops
Multiple Airlines Logo
4:00 pm - 10:50 am
SAI
-
PDX
32h 50m
2 stops
$1,157Multiple Airlines
Thu, Oct 1 - Sun, Oct 18
Multiple Airlines Logo
5:38 pm - 3:10 pm
PDX
-
SAI
31h 32m
2 stops
Multiple Airlines Logo
4:00 pm - 1:37 pm
SAI
-
PDX
35h 37m
2 stops
$1,193Multiple Airlines
Wed, Aug 19 - Wed, Sep 23
Multiple Airlines Logo
9:32 pm - 9:40 am
PDX
-
SAI
46h 08m
2 stops
Multiple Airlines Logo
10:30 am - 12:59 pm
SAI
-
PDX
64h 29m
3 stops
$1,376Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
6:20 am - 9:40 am
PDX
-
SAI
37h 20m
2 stops
Multiple Airlines Logo
10:30 am - 12:59 pm
SAI
-
PDX
64h 29m
3 stops
$1,402Multiple Airlines
Tue, Sep 22 - Mon, Sep 28
Multiple Airlines Logo
5:53 pm - 1:15 pm
PDX
-
SAI
29h 22m
3 stops
Multiple Airlines Logo
9:40 am - 8:50 pm
SAI
-
PDX
25h 10m
3 stops
$1,435Multiple Airlines
Wed, Aug 19 - Wed, Sep 23
Multiple Airlines Logo
11:48 am - 9:55 pm
PDX
-
SAI
44h 07m
3 stops
Multiple Airlines Logo
9:35 am - 5:00 pm
SAI
-
PDX
45h 25m
3 stops
$1,442Multiple Airlines
Thu, Oct 1 - Sun, Oct 18
Multiple Airlines Logo
9:32 pm - 6:20 pm
PDX
-
SAI
30h 48m
3 stops
Multiple Airlines Logo
9:40 am - 10:51 pm
SAI
-
PDX
27h 11m
3 stops
$1,509Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
3:00 pm - 6:20 pm
PDX
-
SAI
37h 20m
3 stops
Multiple Airlines Logo
7:10 pm - 11:55 am
SAI
-
PDX
30h 45m
3 stops
$1,516Multiple Airlines
Tue, Sep 22 - Mon, Sep 28

momondo Fare Finder

 
Customize your flight search to find flights from Portland 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 May 29, 2026.
Use the filters below to find and compare flights from Portland to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 9/22

6:20 am-9:40 am

2 stops37h 20m

Siem Reap–Angkor Intl

Mon 9/28

10:30 am-1:37 pm

2 stops41h 07m

$1,043

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Mon 9/21

9:35 pm-9:40 am

2 stops46h 05m

Siem Reap–Angkor Intl

Mon 9/28

10:30 am-1:37 pm

2 stops41h 07m

$1,116

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Thu 10/1

7:03 am-9:40 am

2 stops36h 37m

Siem Reap–Angkor Intl

Sun 10/18

4:00 pm-10:50 am

2 stops32h 50m

$1,157

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 8/19

5:38 pm-3:10 pm

2 stops31h 32m

Siem Reap–Angkor Intl

Wed 9/23

4:00 pm-1:37 pm

2 stops35h 37m

$1,193

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Mon 9/21

9:32 pm-9:40 am

2 stops46h 08m

Siem Reap–Angkor Intl

Mon 9/28

10:30 am-12:59 pm

3 stops64h 29m

$1,376

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 9/22

6:20 am-9:40 am

2 stops37h 20m

Siem Reap–Angkor Intl

Mon 9/28

10:30 am-12:59 pm

3 stops64h 29m

$1,402
Quickest round-trip

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 8/19

5:53 pm-1:15 pm

3 stops29h 22m

Siem Reap–Angkor Intl

Wed 9/23

9:40 am-8:50 pm

3 stops25h 10m

$1,435

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Thu 10/1

11:48 am-9:55 pm

3 stops44h 07m

Siem Reap–Angkor Intl

Sun 10/18

9:35 am-5:00 pm

3 stops45h 25m

$1,442

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Mon 9/21

9:32 pm-6:20 pm

3 stops30h 48m

Siem Reap–Angkor Intl

Mon 9/28

9:40 am-10:51 pm

3 stops27h 11m

$1,509

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 9/22

3:00 pm-6:20 pm

3 stops37h 20m

Siem Reap–Angkor Intl

Mon 9/28

7:10 pm-11:55 am

3 stops30h 45m

$1,516

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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When to book flights from Portland to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Siem Reap (PDX to SAI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Siem Reap

Fastest flight time

29h 39m

Direct flights

None
The fastest flight from Portland to Siem Reap takes 29h 39m
There are no direct flights from Portland to Siem Reap. There are no popular flight routes from Portland to Siem Reap.
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Frequently asked questions about flying from Portland to Siem Reap

  • How far is Portland to Siem Reap–Angkor Intl by plane?

    Siem Reap–Angkor Intl is 7436.5 mi away from Portland. In terms of flight time, this usually takes a little over 29h 39m.

  • When did momondo last update prices for flights from Portland Airport to Siem Reap–Angkor Intl Airport?

    Prices for flights from Portland Airport to Siem Reap–Angkor Intl Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Portland Airport to Siem Reap–Angkor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Portland Airport to Siem Reap–Angkor Intl Airport.

  • What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

    The required travel and health documents for your Siem Reap–Angkor Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Frequently asked questions about flying from Portland to Siem Reap

  • How do I get Price Alerts for flights from Portland to Siem Reap?

    Confirm your travel details to search for the latest offers for flights from Portland to Siem Reap. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Portland to Siem Reap with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Siem Reap?

It is quick and easy to find Portland 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 Portland to Siem Reap with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Siem Reap from Portland with this policy.

How can momondo help me find flights from Portland to Siem Reap?

Once all potential Portland to Siem Reap flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Portland to Siem Reap right now. Can momondo alert me if prices change?

Price alerts on flights to Siem Reap from Portland 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