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Cheap flights from Oregon to Siem Reap from $595

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Oregon to Siem Reap departing on 1/23. 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 Oregon to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:50 pm - 5:40 pmPDX  Portland-SAI Siem Reap–Angkor Intl
52h 50m2 stops San Francisco Ho Chi Minh City
Multiple Airlines Logo
9:30 pm - 8:48 pmSAI  Siem Reap–Angkor Intl-PDX Portland
38h 18m2 stops Ho Chi Minh City San Francisco
$1,305Multiple Airlines
Tue, Jan 26 - Sat, Feb 13
Multiple Airlines Logo
9:50 pm - 5:40 pmPDX  Portland-SAI Siem Reap–Angkor Intl
52h 50m2 stops San Francisco Ho Chi Minh City
Multiple Airlines Logo
6:40 pm - 8:48 pmSAI  Siem Reap–Angkor Intl-PDX Portland
41h 08m2 stops Ho Chi Minh City San Francisco
$1,306Multiple Airlines
Fri, Jan 15 - Tue, Jan 26
Multiple Airlines Logo
9:50 pm - 5:40 pmPDX  Portland-SAI Siem Reap–Angkor Intl
52h 50m2 stops San Francisco Ho Chi Minh City
Multiple Airlines Logo
6:40 pm - 8:48 pmSAI  Siem Reap–Angkor Intl-PDX Portland
41h 08m2 stops Ho Chi Minh City San Francisco
$1,334Multiple Airlines
Fri, Jan 15 - Tue, Jan 26
Multiple Airlines Logo
5:55 pm - 5:40 pmPDX  Portland-SAI Siem Reap–Angkor Intl
32h 45m3 stops San Francisco Taipei City Taiwan Taoyuan Intl Ho Chi Minh City
Multiple Airlines Logo
1:20 pm - 9:13 pmSAI  Siem Reap–Angkor Intl-PDX Portland
22h 53m3 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl Seattle/Tacoma Intl
$1,377Multiple Airlines
Fri, Jan 15 - Tue, Jan 26
Multiple Airlines Logo
6:50 pm - 6:20 pmPDX  Portland-SAI Siem Reap–Angkor Intl
33h 30m3 stops San Francisco Taipei City Taiwan Taoyuan Intl Ho Chi Minh City
Multiple Airlines Logo
9:30 pm - 11:25 amSAI  Siem Reap–Angkor Intl-PDX Portland
28h 55m3 stops Ho Chi Minh City Taipei City Taiwan Taoyuan Intl Los Angeles Los Angeles
$1,410Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
7:00 am - 9:55 amPDX  Portland-SAI Siem Reap–Angkor Intl
35h 55m3 stops Los Angeles Los Angeles Tokyo Narita Singapore Changi
Multiple Airlines Logo
10:45 am - 9:25 amSAI  Siem Reap–Angkor Intl-PDX Portland
37h 40m2 stops Singapore Changi Los Angeles Los Angeles
$1,433Multiple Airlines
Tue, Jan 26 - Sat, Feb 13
Multiple Airlines Logo
9:32 pm - 5:10 pmPDX  Portland-SAI Siem Reap–Angkor Intl
29h 38m3 stops Seattle/Tacoma Intl Taipei City Taiwan Taoyuan Intl Hanoi Noibai
Multiple Airlines Logo
9:30 pm - 11:25 amSAI  Siem Reap–Angkor Intl-PDX Portland
28h 55m3 stops Ho Chi Minh City Taipei City Taiwan Taoyuan Intl Los Angeles Los Angeles
$1,435Multiple Airlines
Fri, Sep 11 - Mon, Dec 7
Multiple Airlines Logo
7:08 am - 4:00 pmRDM  Bend/Redmond-SAI Siem Reap–Angkor Intl
41h 52m2 stops Los Angeles Los Angeles Singapore Changi
Multiple Airlines Logo
10:45 am - 2:57 pmSAI  Siem Reap–Angkor Intl-RDM Bend/Redmond
43h 12m2 stops Singapore Changi San Francisco
$1,502Multiple Airlines
Sun, Nov 1 - Sun, Nov 8
Multiple Airlines Logo
7:08 am - 4:00 pmRDM  Bend/Redmond-SAI Siem Reap–Angkor Intl
41h 52m2 stops Los Angeles Los Angeles Singapore Changi
Multiple Airlines Logo
10:45 am - 2:57 pmSAI  Siem Reap–Angkor Intl-RDM Bend/Redmond
43h 12m2 stops Singapore Changi San Francisco
$1,508Multiple Airlines
Sun, Nov 1 - Sun, Nov 8
Multiple Airlines Logo
7:08 am - 4:00 pmRDM  Bend/Redmond-SAI Siem Reap–Angkor Intl
41h 52m3 stops Los Angeles Los Angeles Tokyo Narita Singapore Changi
Multiple Airlines Logo
10:45 am - 2:57 pmSAI  Siem Reap–Angkor Intl-RDM Bend/Redmond
43h 12m2 stops Singapore Changi San Francisco
$1,514Multiple Airlines
Sun, Nov 1 - Sun, Nov 8

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Customize your flight search to find flights from Oregon 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 10, 2026.
Use the filters below to find and compare flights from Oregon to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Tue 1/26

9:50 pm-5:40 pm

2 stops52h 50m

Siem Reap–Angkor Intl

Sat 2/13

9:30 pm-8:48 pm

2 stops38h 18m

$1,305

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Fri 1/15

9:50 pm-5:40 pm

2 stops52h 50m

Siem Reap–Angkor Intl

Tue 1/26

6:40 pm-8:48 pm

2 stops41h 08m

$1,306

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Fri 1/15

9:50 pm-5:40 pm

2 stops52h 50m

Siem Reap–Angkor Intl

Tue 1/26

6:40 pm-8:48 pm

2 stops41h 08m

$1,334
Quickest round-trip

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Fri 1/15

5:55 pm-5:40 pm

3 stops32h 45m

Siem Reap–Angkor Intl

Tue 1/26

1:20 pm-9:13 pm

3 stops22h 53m

$1,377

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Fri 9/11

6:50 pm-6:20 pm

3 stops33h 30m

Siem Reap–Angkor Intl

Mon 12/7

9:30 pm-11:25 am

3 stops28h 55m

$1,410

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Tue 1/26

7:00 am-9:55 am

3 stops35h 55m

Siem Reap–Angkor Intl

Sat 2/13

10:45 am-9:25 am

2 stops37h 40m

$1,433

PortlandSiem Reap

PDX Portland - SAI Siem Reap–Angkor Intl

PDXSAI

Portland

Fri 9/11

9:32 pm-5:10 pm

3 stops29h 38m

Siem Reap–Angkor Intl

Mon 12/7

9:30 pm-11:25 am

3 stops28h 55m

$1,435

RedmondSiem Reap

RDM Bend/Redmond - SAI Siem Reap–Angkor Intl

RDMSAI

Bend/Redmond

Sun 11/1

7:08 am-4:00 pm

2 stops41h 52m

Siem Reap–Angkor Intl

Sun 11/8

10:45 am-2:57 pm

2 stops43h 12m

$1,502

RedmondSiem Reap

RDM Bend/Redmond - SAI Siem Reap–Angkor Intl

RDMSAI

Bend/Redmond

Sun 11/1

7:08 am-4:00 pm

2 stops41h 52m

Siem Reap–Angkor Intl

Sun 11/8

10:45 am-2:57 pm

2 stops43h 12m

$1,508

RedmondSiem Reap

RDM Bend/Redmond - SAI Siem Reap–Angkor Intl

RDMSAI

Bend/Redmond

Sun 11/1

7:08 am-4:00 pm

3 stops41h 52m

Siem Reap–Angkor Intl

Sun 11/8

10:45 am-2:57 pm

2 stops43h 12m

$1,514

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Oregon 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

How long does it take to fly to Siem Reap?

On average, it takes 29h 38m to fly from Oregon to Siem Reap if you fly out of Portland (the most popular airport in Oregon) and into Siem Reap (the most popular airport in Siem Reap). If you’re flying out of Redmond and into Siem Reap, then the flight time is around 41h 52m.

Cheap Oregon to Siem Reap flight deals and tips

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

Fastest flight time

29h 38m

Direct flights

None
The fastest flight from Oregon to Siem Reap takes 29h 38m
There are no direct flights from Oregon to Siem Reap. There are no popular flight routes from Oregon to Siem Reap.
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Frequently asked questions about flying from Oregon to Siem Reap

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

    Prices for flights from Oregon to Siem Reap–Angkor Intl Airport refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Oregon 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 Oregon to Siem Reap?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Siem Reap from Oregon.

Can I find flights from Oregon to Siem Reap with flexible booking policies on momondo?

Yes. All flights to Siem Reap from Oregon on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Oregon 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 Oregon to Siem Reap right now. Can momondo alert me if prices change?

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

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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