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Cheap flights from Portland to Siem Reap from $642

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 10/21. 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

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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
6:06 am - 9:40 am
PDX
-
SAI
37h 34m
2 stops
Multiple Airlines Logo
10:45 am - 9:25 am
SAI
-
PDX
37h 40m
2 stops
$1,075Multiple Airlines
Tue, Oct 6 - Thu, Dec 3
Multiple Airlines Logo
9:29 pm - 9:40 am
PDX
-
SAI
46h 11m
2 stops
Multiple Airlines Logo
10:45 am - 10:33 pm
SAI
-
PDX
26h 48m
2 stops
$1,259Multiple Airlines
Wed, Oct 7 - Wed, Mar 10
Multiple Airlines Logo
7:37 pm - 1:15 pm
PDX
-
SAI
27h 38m
3 stops
Multiple Airlines Logo
1:20 pm - 9:13 pm
SAI
-
PDX
22h 53m
3 stops
$1,435Multiple Airlines
Tue, Oct 6 - Thu, Dec 3
Multiple Airlines Logo
9:33 pm - 8:45 am
PDX
-
SAI
45h 12m
3 stops
Multiple Airlines Logo
6:40 pm - 1:50 pm
SAI
-
PDX
34h 10m
3 stops
$1,502Multiple Airlines
Wed, Oct 7 - Wed, Mar 10
Multiple Airlines Logo
7:03 am - 9:40 am
PDX
-
SAI
36h 37m
3 stops
Multiple Airlines Logo
10:45 am - 9:25 am
SAI
-
PDX
37h 40m
2 stops
$1,618Multiple Airlines
Tue, Oct 6 - Thu, Dec 3
Multiple Airlines Logo
2:49 pm - 6:20 pm
PDX
-
SAI
37h 31m
2 stops
Multiple Airlines Logo
6:40 pm - 1:50 pm
SAI
-
PDX
34h 10m
3 stops
$1,639Multiple Airlines
Wed, Oct 7 - Wed, Mar 10
Multiple Airlines Logo
9:30 pm - 6:20 pm
PDX
-
SAI
30h 50m
3 stops
Multiple Airlines Logo
12:55 pm - 11:35 pm
SAI
-
PDX
24h 40m
3 stops
$1,690Multiple Airlines
Tue, Jul 14 - Tue, Jul 28
Multiple Airlines Logo
10:45 am - 9:30 pm
PDX
-
SAI
44h 45m
3 stops
Multiple Airlines Logo
11:50 pm - 9:49 am
SAI
-
PDX
47h 59m
3 stops
$1,693Multiple Airlines
Tue, Jul 14 - Tue, Jul 28
Multiple Airlines Logo
5:36 pm - 1:15 pm
PDX
-
SAI
29h 39m
3 stops
Multiple Airlines Logo
9:40 am - 10:25 pm
SAI
-
PDX
26h 45m
3 stops
$1,702Multiple Airlines
Tue, Jul 7 - Tue, Jul 21
Multiple Airlines Logo
5:36 pm - 1:15 pm
PDX
-
SAI
29h 39m
3 stops
Multiple Airlines Logo
12:55 pm - 10:25 pm
SAI
-
PDX
23h 30m
3 stops
$1,712Multiple Airlines
Tue, Jul 7 - Tue, Jul 21

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 June 4, 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 10/6

6:06 am-9:40 am

2 stops37h 34m

Siem Reap–Angkor Intl

Thu 12/3

10:45 am-9:25 am

2 stops37h 40m

$1,075

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 10/7

9:29 pm-9:40 am

2 stops46h 11m

Siem Reap–Angkor Intl

Wed 3/10

10:45 am-10:33 pm

2 stops26h 48m

$1,259
Quickest round-trip

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 10/6

7:37 pm-1:15 pm

3 stops27h 38m

Siem Reap–Angkor Intl

Thu 12/3

1:20 pm-9:13 pm

3 stops22h 53m

$1,435

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 10/7

9:33 pm-8:45 am

3 stops45h 12m

Siem Reap–Angkor Intl

Wed 3/10

6:40 pm-1:50 pm

3 stops34h 10m

$1,502

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 10/6

7:03 am-9:40 am

3 stops36h 37m

Siem Reap–Angkor Intl

Thu 12/3

10:45 am-9:25 am

2 stops37h 40m

$1,618

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 10/7

2:49 pm-6:20 pm

2 stops37h 31m

Siem Reap–Angkor Intl

Wed 3/10

6:40 pm-1:50 pm

3 stops34h 10m

$1,639

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 7/14

9:30 pm-6:20 pm

3 stops30h 50m

Siem Reap–Angkor Intl

Tue 7/28

12:55 pm-11:35 pm

3 stops24h 40m

$1,690

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 7/14

10:45 am-9:30 pm

3 stops44h 45m

Siem Reap–Angkor Intl

Tue 7/28

11:50 pm-9:49 am

3 stops47h 59m

$1,693

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 7/7

5:36 pm-1:15 pm

3 stops29h 39m

Siem Reap–Angkor Intl

Tue 7/21

9:40 am-10:25 pm

3 stops26h 45m

$1,702

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 7/7

5:36 pm-1:15 pm

3 stops29h 39m

Siem Reap–Angkor Intl

Tue 7/21

12:55 pm-10:25 pm

3 stops23h 30m

$1,712

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Portland 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 Portland to Siem Reap–Angkor Intl?

United Airlines is the most popular carrier operating from Portland to Siem Reap–Angkor Intl

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

44h 45m

Direct flights

None
The fastest flight from Portland to Siem Reap takes 44h 45m
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 44h 45m.

  • 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.

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