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Ko Samui

$1,255+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — USM
Aug 29 — Sep 51
Sat 8/29
Sat 9/5
1 adult, Economy
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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 July 30, 2026.

This IEagle deal was found by Cheapflights users on 7/26. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:41 pm
PDX
-
USM
3 stops30h 04m
Multiple Airlines
Thu 9/171:50 pm
USM
-
PDX
3 stops22h 11m
Multiple Airlines
Deal found 7/26$1,255
This Cathay Pacific deal was found by Cheapflights users on 7/27. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:12 pm
PDX
-
USM
2 stops39h 28m
Cathay Pacific
Mon 9/1411:55 am
USM
-
PDX
2 stops63h 56m
Cathay Pacific
Deal found 7/27$1,612
This British Airways deal was found by Cheapflights users on 7/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:30 pm
PDX
-
USM
2 stops35h 40m
British Airways
Mon 10/194:25 pm
USM
-
PDX
2 stops39h 15m
British Airways
Deal found 7/28$2,332
This Ovago deal was found by Cheapflights users on 7/28. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/137:10 pm
PDX
-
USM
2 stops32h 05m
Multiple Airlines
Sun 12/139:10 pm
USM
-
PDX
2 stops27h 16m
Multiple Airlines
Deal found 7/28$2,434
This business-class.com deal was found by Cheapflights users on 7/26. 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 business-class.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:00 am
PDX
-
USM
3 stops33h 10m
Multiple Airlines
Fri 12/119:10 pm
USM
-
PDX
3 stops31h 40m
Multiple Airlines
Deal found 7/26$2,492

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 July 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,255
(IEagle)
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 July 30, 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

Thu 9/10

5:41 pm-1:45 pm

3 stops30h 04m

Ko Samui

Thu 9/17

1:50 pm-10:01 pm

3 stops22h 11m

$1,255

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 9/10

2:12 pm-7:40 pm

2 stops39h 28m

Ko Samui

Mon 9/14

11:55 am-1:51 pm

2 stops63h 56m

$1,612

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 10/15

7:30 pm-9:10 pm

2 stops35h 40m

Ko Samui

Mon 10/19

4:25 pm-5:40 pm

2 stops39h 15m

$2,332

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 12/1

9:35 pm-9:05 pm

2 stops32h 30m

Ko Samui

Fri 12/11

4:25 pm-1:06 pm

2 stops59h 41m

$2,598

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

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 July.
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.

  • How long is the flight from Portland to Ko Samui?

    For as low as $1,612, Cathay Pacific can have you in Ko Samui from Portland in 39h 28m. There are 7795 mi between Portland and Ko Samui.

  • 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.

See more FAQs

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

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