Latest deals
FAQs
Price Alerts

Cheap flights from Portland to Siem Reap from $578

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 9/11. 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 Portland to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:42 pm - 6:20 pm
PDX
-
SAI
37h 38m
2 stops
Multiple Airlines Logo
7:10 pm - 10:52 am
SAI
-
PDX
53h 42m
2 stops
$1,201Multiple Airlines
Wed, Sep 30 - Fri, Oct 16
Multiple Airlines Logo
5:53 pm - 6:20 pm
PDX
-
SAI
34h 27m
3 stops
Multiple Airlines Logo
7:10 pm - 1:46 pm
SAI
-
PDX
32h 36m
3 stops
$1,325Multiple Airlines
Tue, Aug 25 - Tue, Sep 1
Multiple Airlines Logo
9:32 pm - 6:20 pm
PDX
-
SAI
30h 48m
3 stops
Multiple Airlines Logo
1:20 pm - 10:33 pm
SAI
-
PDX
24h 13m
3 stops
$1,381Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
9:35 pm - 6:20 pm
PDX
-
SAI
30h 45m
3 stops
Multiple Airlines Logo
9:55 am - 8:31 pm
SAI
-
PDX
25h 36m
3 stops
$1,388Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
5:53 pm - 1:15 pm
PDX
-
SAI
29h 22m
3 stops
Multiple Airlines Logo
1:20 pm - 10:33 pm
SAI
-
PDX
24h 13m
3 stops
$1,391Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
9:32 pm - 5:10 pm
PDX
-
SAI
29h 38m
3 stops
Multiple Airlines Logo
6:40 pm - 1:50 pm
SAI
-
PDX
34h 10m
3 stops
$1,396Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
9:32 pm - 6:20 pm
PDX
-
SAI
30h 48m
3 stops
Multiple Airlines Logo
9:40 am - 8:50 pm
SAI
-
PDX
25h 10m
3 stops
$1,406Multiple Airlines
Wed, Sep 30 - Fri, Oct 16
Multiple Airlines Logo
5:55 pm - 4:55 pm
PDX
-
SAI
33h 00m
3 stops
Multiple Airlines Logo
7:10 pm - 10:52 am
SAI
-
PDX
53h 42m
2 stops
$1,470Multiple Airlines
Wed, Sep 30 - Fri, Oct 16
Multiple Airlines Logo
5:53 pm - 6:20 pm
PDX
-
SAI
34h 27m
3 stops
Multiple Airlines Logo
10:35 pm - 10:09 am
SAI
-
PDX
49h 34m
2 stops
$1,493Multiple Airlines
Tue, Aug 25 - Tue, Sep 1
Multiple Airlines Logo
7:03 am - 9:40 am
PDX
-
SAI
36h 37m
2 stops
Multiple Airlines Logo
10:30 am - 10:50 am
SAI
-
PDX
38h 20m
2 stops
$1,535Multiple Airlines
Tue, Aug 25 - Tue, Sep 1

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Region of 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 July 30, 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

Wed 9/30

2:42 pm-6:20 pm

2 stops37h 38m

Siem Reap–Angkor Intl

Fri 10/16

7:10 pm-10:52 am

2 stops53h 42m

$1,201

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 8/25

5:53 pm-6:20 pm

3 stops34h 27m

Siem Reap–Angkor Intl

Tue 9/1

7:10 pm-1:46 pm

3 stops32h 36m

$1,325

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Fri 9/11

9:32 pm-6:20 pm

3 stops30h 48m

Siem Reap–Angkor Intl

Mon 12/7

1:20 pm-10:33 pm

3 stops24h 13m

$1,381

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Fri 9/11

9:35 pm-6:20 pm

3 stops30h 45m

Siem Reap–Angkor Intl

Mon 12/7

9:55 am-8:31 pm

3 stops25h 36m

$1,388
Quickest round-trip

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Fri 9/11

5:53 pm-1:15 pm

3 stops29h 22m

Siem Reap–Angkor Intl

Mon 12/7

1:20 pm-10:33 pm

3 stops24h 13m

$1,391

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Fri 9/11

9:32 pm-5:10 pm

3 stops29h 38m

Siem Reap–Angkor Intl

Mon 12/7

6:40 pm-1:50 pm

3 stops34h 10m

$1,396

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 9/30

9:32 pm-6:20 pm

3 stops30h 48m

Siem Reap–Angkor Intl

Fri 10/16

9:40 am-8:50 pm

3 stops25h 10m

$1,406

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Wed 9/30

5:55 pm-4:55 pm

3 stops33h 00m

Siem Reap–Angkor Intl

Fri 10/16

7:10 pm-10:52 am

2 stops53h 42m

$1,470

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 8/25

5:53 pm-6:20 pm

3 stops34h 27m

Siem Reap–Angkor Intl

Tue 9/1

10:35 pm-10:09 am

2 stops49h 34m

$1,493

PortlandSiem Reap

PDX - SAI

PDXSAI

Portland

Tue 8/25

7:03 am-9:40 am

2 stops36h 37m

Siem Reap–Angkor Intl

Tue 9/1

10:30 am-10:50 am

2 stops38h 20m

$1,535

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Cheap Portland to Region of Siem Reap flight deals and tips

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

Fastest flight time

29h 22m

Direct flights

None
The fastest flight from Portland to Region of Siem Reap takes 29h 22m
There are no direct flights from Portland to Region of Siem Reap. There are no popular flight routes from Portland to Region of Siem Reap.
Search flight deals

Frequently asked questions about flying from Portland to Siem Reap

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

    Prices for flights from Portland Airport to Siem Reap were last updated today.

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

    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.

  • What documentation or ID do you need to fly to Siem Reap?

    The travel and health documents you'll need for your trip to Siem Reap 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. It is always advisable to seek advice from your airline or a trusted 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 Region of Siem Reap?

    Price Alerts will notify you by email when the price for flights to Region of Siem Reap from Portland decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

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

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Why use momondo?

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

Finding the right flight to Siem Reap from Portland is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Siem Reap quick and easy, saving you time and money.

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?

Of course. momondo tracks the price of Portland to Siem Reap flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Region of Siem Reap trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 8/29
Sat 9/5
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Siem Reap

Popular cities in Siem Reap

Popular flights according to clicks in the last 7 days on momondo
Flights to Phnom Penh
Flights to Siem Reapfrom $817
Flights to Krong Preah Sihanoukfrom $1,134