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Ko Samui

$562+ Cheap flights from Portland (PDX) to Ko Samui (USM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — USM
Apr 5 — Apr 121
Sun 4/5
Sun 4/12
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 March 6, 2026.

This IEagle deal was found by Cheapflights users on 3/3. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/138:59 pm
PDX
-
USM
3 stops26h 46m
Multiple Airlines
Sun 9/209:00 pm
USM
-
PDX
3 stops47h 20m
Multiple Airlines
Deal found 3/3$1,078
This IEagle deal was found by Cheapflights users on 3/2. 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.
Tue 12/17:40 pm
PDX
-
USM
3 stops28h 15m
Multiple Airlines
Fri 12/112:05 pm
USM
-
PDX
3 stops22h 08m
Multiple Airlines
Deal found 3/2$1,176
This BusinessClass deal was found by Cheapflights users on 3/2. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:10 pm
PDX
-
USM
2 stops26h 55m
Multiple Airlines
Fri 12/117:45 pm
USM
-
PDX
2 stops33h 55m
Multiple Airlines
Deal found 3/2$1,237
This Gurufare deal was found by Cheapflights users on 3/1. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:27 pm
PDX
-
USM
3 stops28h 18m
Multiple Airlines
Thu 4/232:00 pm
USM
-
PDX
3 stops33h 31m
Multiple Airlines
Deal found 3/1$1,318
This CheapOair deal was found by Cheapflights users on 3/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:05 am
PDX
-
USM
3 stops34h 25m
Cathay Pacific
Thu 4/2311:55 am
USM
-
PDX
2 stops22h 40m
Cathay Pacific
Deal found 3/1$1,414
This Ovago deal was found by Cheapflights users on 3/4. 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.
Sun 4/1910:30 am
PDX
-
USM
3 stops30h 40m
Cathay Pacific
Sun 4/2611:55 am
USM
-
PDX
2 stops25h 49m
Cathay Pacific
Deal found 3/4$1,518

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 March 6, 2026.

Most accurate provider

AranGrant
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$1,318
(Gurufare)

One-way from

$562
(Kiwi.com)
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
One-way flight 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 March 6, 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

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/16

7:27 pm-1:45 pm

3 stops28h 18m

Ko Samui

Thu 4/23

2:00 pm-9:31 am

3 stops33h 31m

$1,318

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/16

7:05 am-7:30 am

3 stops34h 25m

Ko Samui

Thu 4/23

11:55 am-8:35 pm

2 stops22h 40m

$1,414

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 4/19

7:14 am-7:30 am

3 stops34h 16m

Ko Samui

Sun 4/26

7:10 pm-4:49 pm

3 stops35h 39m

$1,414

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 4/19

10:30 am-7:10 am

3 stops30h 40m

Ko Samui

Sun 4/26

11:55 am-11:44 pm

2 stops25h 49m

$1,518
Quickest round-trip

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/2

7:05 pm-1:10 pm

2 stops28h 05m

Ko Samui

Sun 4/12

8:35 pm-9:10 am

2 stops26h 35m

$2,176

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 4/2

10:31 am-10:30 am

3 stops33h 59m

Ko Samui

Sun 4/12

7:15 pm-4:52 pm

3 stops35h 37m

$2,253
Cheapest one-way

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 8/5

10:45 am-5:25 pm

3 stops40h 40m

$562

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Mon 7/27

12:13 pm-8:50 pm

3 stops42h 37m

$641
Quickest one-way

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 8/2

7:45 pm-6:15 pm

2 stops32h 30m

$687

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 8/2

5:34 pm-7:40 pm

2 stops60h 06m

$910

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/4

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Portland-Ko Samui flight deals on Cheapflights vs. AranGrant 90-95% 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 March 6, 2026.

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.

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

    For as low as $1,414, Cathay Pacific can have you in Ko Samui from Portland in 34h 25m. 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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