Latest deals
When to book
FAQs
Price Alerts

Cheap flights from Portland to Ko Samui from $615

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Ko Samui departing on 10/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Portland to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:40 am - 7:45 am
PDX
-
USM
31h 05m
3 stops
Multiple Airlines Logo
9:10 pm - 9:26 am
USM
-
PDX
27h 16m
2 stops
$1,282Multiple Airlines
Tue, Dec 1 - Fri, Dec 11
Multiple Airlines Logo
7:10 pm - 11:50 am
PDX
-
USM
25h 40m
2 stops
Multiple Airlines Logo
8:40 pm - 2:41 pm
USM
-
PDX
33h 01m
2 stops
$1,375Multiple Airlines
Tue, Dec 1 - Fri, Dec 11
Multiple Airlines Logo
1:50 pm - 3:35 pm
PDX
-
USM
34h 45m
3 stops
Multiple Airlines Logo
2:05 pm - 9:13 pm
USM
-
PDX
22h 08m
3 stops
$1,475Multiple Airlines
Tue, Dec 1 - Fri, Dec 11
Multiple Airlines Logo
3:43 pm - 9:10 pm
PDX
-
USM
39h 27m
2 stops
Multiple Airlines Logo
1:30 pm - 10:11 am
USM
-
PDX
34h 41m
2 stops
$1,498Multiple Airlines
Wed, Aug 12 - Tue, Aug 25
Multiple Airlines Logo
3:30 pm - 8:15 am
PDX
-
USM
26h 45m
2 stops
Multiple Airlines Logo
6:55 pm - 9:31 am
USM
-
PDX
28h 36m
2 stops
$1,576Multiple Airlines
Wed, Jul 22 - Thu, Aug 6
Multiple Airlines Logo
3:30 pm - 8:15 am
PDX
-
USM
26h 45m
2 stops
Multiple Airlines Logo
6:55 pm - 9:31 am
USM
-
PDX
28h 36m
2 stops
$1,577Multiple Airlines
Wed, Jul 22 - Thu, Aug 6
Cathay Pacific Logo
2:12 pm - 7:40 pm
PDX
-
USM
39h 28m
2 stops
Cathay Pacific Logo
11:55 am - 1:51 pm
USM
-
PDX
63h 56m
2 stops
$1,765Cathay Pacific
Thu, Sep 10 - Mon, Sep 14
Cathay Pacific Logo
2:12 pm - 7:40 pm
PDX
-
USM
39h 28m
2 stops
Cathay Pacific Logo
11:55 am - 1:51 pm
USM
-
PDX
63h 56m
2 stops
$1,766Cathay Pacific
Thu, Sep 10 - Mon, Sep 14
Multiple Airlines Logo
9:48 pm - 7:40 pm
PDX
-
USM
31h 52m
2 stops
Multiple Airlines Logo
11:55 am - 9:48 am
USM
-
PDX
35h 53m
2 stops
$1,850Multiple Airlines
Mon, Jul 13 - Sun, Sep 13
Multiple Airlines Logo
9:48 pm - 7:40 pm
PDX
-
USM
31h 52m
2 stops
Multiple Airlines Logo
11:55 am - 9:48 am
USM
-
PDX
35h 53m
2 stops
$1,854Multiple Airlines
Mon, Jul 13 - Sun, Sep 13

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Cathay Pacific flights from Portland to Ko Samui

Our best Cathay Pacific deals on Portland to Ko Samui flight tickets
Cathay Pacific
Sep 10
PDX2:12 pmPortland
39h 28m
2 stops
USM7:40 pmKo Samui
Sep 14
USM11:55 amKo Samui
63h 56m
2 stops
PDX1:51 pmPortland
$1,765
Cathay Pacific
Sep 10
PDX2:12 pmPortland
39h 28m
2 stops
USM7:40 pmKo Samui
Sep 14
USM11:55 amKo Samui
63h 56m
2 stops
PDX1:51 pmPortland
$1,766
Cathay Pacific
Jul 13
PDX10:29 amPortland
31h 51m
3 stops
USM8:20 amKo Samui
Sep 13
USM6:00 amKo Samui
24h 30m
3 stops
PDX4:30 pmPortland
$2,188

Qatar Airways flights from Portland to Ko Samui

Our best Qatar Airways deals on Portland to Ko Samui flight tickets
Qatar Airways
Jul 13
PDX10:42 amPortland
34h 23m
3 stops
USM11:05 amKo Samui
Sep 13
USM8:35 pmKo Samui
34h 15m
3 stops
PDX4:50 pmPortland
$2,230
Qatar Airways
Aug 12
PDX7:30 amPortland
37h 15m
3 stops
USM10:45 amKo Samui
Aug 25
USM6:25 pmKo Samui
36h 24m
3 stops
PDX4:49 pmPortland
$2,322
Qatar Airways
Jul 22
PDX7:30 amPortland
37h 15m
3 stops
USM10:45 amKo Samui
Aug 6
USM8:50 pmKo Samui
34h 05m
3 stops
PDX4:55 pmPortland
$2,396

momondo 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, momondo users made 832,500 searches. Data last updated June 28, 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

Tue 12/1

9:40 am-7:45 am

3 stops31h 05m

Ko Samui

Fri 12/11

9:10 pm-9:26 am

2 stops27h 16m

$1,282

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 12/1

7:10 pm-11:50 am

2 stops25h 40m

Ko Samui

Fri 12/11

8:40 pm-2:41 pm

2 stops33h 01m

$1,375

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Tue 12/1

1:50 pm-3:35 pm

3 stops34h 45m

Ko Samui

Fri 12/11

2:05 pm-9:13 pm

3 stops22h 08m

$1,475

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 8/12

3:43 pm-9:10 pm

2 stops39h 27m

Ko Samui

Tue 8/25

1:30 pm-10:11 am

2 stops34h 41m

$1,498
Quickest round-trip

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 7/22

3:30 pm-8:15 am

2 stops26h 45m

Ko Samui

Thu 8/6

6:55 pm-9:31 am

2 stops28h 36m

$1,576

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 7/22

3:30 pm-8:15 am

2 stops26h 45m

Ko Samui

Thu 8/6

6:55 pm-9:31 am

2 stops28h 36m

$1,577

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

$1,765

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

$1,766

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Mon 7/13

9:48 pm-7:40 pm

2 stops31h 52m

Ko Samui

Sun 9/13

11:55 am-9:48 am

2 stops35h 53m

$1,850

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Mon 7/13

9:48 pm-7:40 pm

2 stops31h 52m

Ko Samui

Sun 9/13

11:55 am-9:48 am

2 stops35h 53m

$1,854

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

When to book flights from Portland to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Ko Samui (PDX to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Ko Samui

Fastest flight time

26h 45m

Direct flights

None
The fastest flight from Portland to Ko Samui takes 26h 45m
There are no direct flights from Portland to Ko Samui. There are no popular flight routes from Portland to Ko Samui.
Search flight deals

Frequently asked questions about flying from Portland to Ko Samui

  • How far is Portland to Ko Samui by plane?

    There are 7797.0 mi between Portland and Ko Samui. 26h 45m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Portland Airport to Ko Samui Airport?

    Prices for flights from Portland Airport to Ko Samui Airport are updated daily.

  • How old do you have to be to fly from Portland Airport to Ko Samui Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The necessary travel and health documents for your Ko Samui Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from Portland to Ko Samui

  • How do I get Price Alerts for flights from Portland to Ko Samui?

    Confirm your travel details to search for the latest offers for flights from Portland to Ko Samui. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Portland to Ko Samui with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Traveling to a place near Ko Samui?

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

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Ko Samui?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ko Samui from Portland.

Can I find flights from Portland to Ko Samui with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Portland to Ko Samui flights to just show those with flexible booking policies.

How can momondo help me find flights from Portland to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from Portland.

I’m not ready to book a flight from Portland to Ko Samui right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ko Samui, momondo offers a useful price alert feature which will track prices for flights to Ko Samui from Portland and alert you when they change.

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 7/28
Tue 8/4
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand