HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ko Samui

$1,318+ Cheap flights from Portland (PDX) to Ko Samui (USM)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — USM
Jun 30 — Jul 71
Tue 6/30
Tue 7/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Ko Samui 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.

Cheap flight deals from Portland to Ko Samui

Cheapest flights from Portland to Ko Samui
Explore the most affordable flight options available from Portland to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 31, 2026.

This Gotogate deal was found by Cheapflights users on 5/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:15 am
PDX
-
USM
3 stops34h 25m
Multiple Airlines
Sun 12/68:45 pm
USM
-
PDX
2 stops27h 41m
Multiple Airlines
Deal found 5/30$1,318
This Gotogate deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:45 pm
PDX
-
USM
2 stops32h 30m
Multiple Airlines
Wed 6/104:25 pm
USM
-
PDX
2 stops31h 05m
Multiple Airlines
Deal found 5/29$1,473
This Qatar Airways deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am
PDX
-
USM
3 stops35h 20m
Qatar Airways
Sun 12/66:15 pm
USM
-
PDX
3 stops35h 40m
Qatar Airways
Deal found 5/29$1,602

Find flight deals from Portland to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Ko Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 31, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,318
(Gotogate)
Provider with most accurate pricing for Portland-Ko Samui flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Ko Samui flights.
Search Deals
From Portland to Ko Samui
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Ko Samui 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, Cheapflights users made 2,558,603 searches. Data last updated May 31, 2026.
Use the filters below to find and compare flights from Portland to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 7/22

3:30 pm-8:35 am

2 stops27h 05m

Ko Samui

Thu 8/6

6:25 pm-9:31 am

2 stops29h 06m

$1,837

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 6/5

7:45 pm-6:15 pm

2 stops32h 30m

Ko Samui

Wed 6/10

8:45 am-9:30 am

3 stops38h 45m

$1,871

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 7/17

3:30 pm-7:40 pm

2 stops38h 10m

Ko Samui

Sun 7/26

6:25 pm-9:31 am

2 stops29h 06m

$2,081

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 7/17

10:45 am-11:40 am

3 stops34h 55m

Ko Samui

Sun 7/26

7:45 pm-4:55 pm

3 stops35h 10m

$2,149

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/28

Sorted by cheapest first

Compare providers for flights from Portland to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ko Samui in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Ko Samui flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Ko Samui flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Ko Samui flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Ko Samui flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

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

  • Can I find deals for flights from Portland to Ko Samui that include hotel bookings?

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

  • How can I find direct flights from Portland to Ko Samui?

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

  • Can I find deals for business class flights from Portland to Ko Samui?

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

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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 Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Suvarnabhumi flights
Boise to Suvarnabhumi flights
Portland to Phuket City flights
Eugene to Chiang Mai flights
Portland to Chiang Mai flights
Portland to Krabi flights

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.