HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Siem Reap

Cheap flights from Portland (PDX) to Siem Reap

PDX — SAI
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Siem Reap with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Insights

Everything you need to know about your flight from Portland to Siem Reap

What is the cheapest time of day to fly from PDX to SI?

Find hourly flight availability from Portland to Siem Reap. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 20, 2025.

When flying from Portland to Region of Siem Reap, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Siem Reap

Get insights into the airlines that provide service to Siem Reap. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Siem Reap. Reviews last updated August 20, 2025.
Peruse reviews from past customers who have flown with Singapore Airlines from Portland to Siem Reap to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very good
1,347 reviews

Comfort

8.0

Food

7.7

Crew

8.6

Overall

8.1

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SIN - AMD

Food was not good. It was like few days old.
Singapore Airlines
8.1
Very good
1,347 reviews
Singapore Airlines
8.1
Very good
1,347 reviews

Comfort

8.0

Food

7.7

Crew

8.6

Overall

8.1

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Ketan,Nov 2024

SIN - AMD

Food was not good. It was like few days old.

Related info for your journey

Find useful and relevant information for your journey from Portland to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Portland to Siem Reap?

    For a flight from Portland to Siem Reap, you will be flying from Portland. Portland (PDX) is just 6.0 mi from the center of the city.

  • Can I find deals for flights from Portland to Siem Reap that include hotel bookings?

    Yes. In addition to deals on Portland to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Siem Reap?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Siem Reap.

  • Can I find deals for business class flights from Portland to Siem Reap?

    Yes. Cheapflights offers flight deals from Portland to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Phnom Penh flights
Boise to Phnom Penh flights

Top airline flying from Portland to Siem Reap

Discover the top airline that operate flights from Portland to Siem Reap. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$1,091Average$1,239FlexibilityNo cancel feeOn-time81%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.