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Ko Samui

$1,141+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — USM
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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Find 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 November 6, 2025.

This Cathay Pacific deal was found by Cheapflights users on 11/3. 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 11/135:41 pmPDX - USM
2 stops34h 54mCathay Pacific
Mon 11/1711:40 amUSM - PDX
2 stops24h 10mCathay Pacific
Deal found 11/3$1,391
This oojo deal was found by Cheapflights users on 11/6. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:50 pmPDX - USM
2 stops34h 45mCathay Pacific
Fri 1/211:40 amUSM - PDX
2 stops24h 20mCathay Pacific
Deal found 11/6$6,641

Cheap 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 November 6, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$1,141
(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 November 6, 2025.
Use the filters below to find and compare flights from Portland to Ko Samui that are best for you.

Fly from

Portland

Fly to

Ko Samui

Route

Depart

Return

Price

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 4/15

7:45 pm-1:45 pm

3 stops28h 00m

Ko Samui

Thu 4/30

2:00 pm-12:03 am

3 stops24h 03m

$1,141

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/23

7:45 pm-1:45 pm

3 stops28h 00m

Ko Samui

Fri 5/1

8:50 pm-1:19 pm

3 stops30h 29m

$1,172

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 1/22

7:00 pm-9:20 am

2 stops23h 20m

Ko Samui

Tue 1/27

7:30 pm-9:15 am

2 stops28h 45m

$1,200

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sat 1/24

2:38 pm-3:35 pm

3 stops33h 57m

Ko Samui

Sat 1/31

2:05 pm-8:47 pm

3 stops21h 42m

$1,261

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 2/1

6:00 am-3:35 pm

3 stops42h 35m

Ko Samui

Sat 2/14

7:35 pm-9:20 am

3 stops52h 45m

$1,266

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 Expedia the most. Expedia 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.

Cheapflights Insights

Everything you need to know about your flight from Portland to Ko Samui

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

Find hourly flight availability from Portland to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 6, 2025.

One of the essential ways to save on airfare from Portland to Ko Samui is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 66% on airfare.

What is the cheapest day to fly from Portland to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Portland to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Portland to Ko Samui flight should consider departing on Tuesday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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

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