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Ko Samui

$542+ Cheap flights from Denver (DEN) 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 11/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — USM
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Denver to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) 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 September 11, 2025.

Round-trip from

$1,354
(Booking.com)

One-way from

$597
(Kiwi.com)
From Denver Intl to Ko Samui
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One-way flight from Denver Intl to Ko Samui
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Find flight deals from Denver to Ko Samui

Cheapest flights from Denver to Ko Samui
Explore the most affordable flight options available from Denver to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This oojo deal was found by Cheapflights users on 9/9. 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.
Mon 10/136:14 pmDEN - USM
2 stops35h 21mCathay Pacific
Wed 10/2210:55 amUSM - DEN
2 stops37h 33mCathay Pacific
Deal found 9/9$1,599
This FlightHub deal was found by Cheapflights users on 9/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:05 pmDEN - USM
2 stops26h 45mMultiple Airlines
Sun 11/167:10 pmUSM - DEN
2 stops31h 27mMultiple Airlines
Deal found 9/11$1,655
This Gotogate deal was found by Cheapflights users on 9/9. 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.
Sat 10/257:55 pmDEN - USM
3 stops30h 40mMultiple Airlines
Sat 11/19:10 pmUSM - DEN
2 stops29h 27mMultiple Airlines
Deal found 9/9$1,676
This Air France deal was found by Cheapflights users on 9/8. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:40 pmDEN - USM
2 stops38h 30mAir France
Mon 10/64:25 pmUSM - DEN
2 stops36h 05mAir France
Deal found 9/8$1,823
This Qatar Airways deal was found by Cheapflights users on 9/9. 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.
Sat 10/2512:49 pmDEN - USM
3 stops32h 46mQatar Airways
Sat 11/15:05 pmUSM - DEN
3 stops34h 53mQatar Airways
Deal found 9/9$1,899
This Qatar Airways deal was found by Cheapflights users on 9/11. 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.
Fri 11/711:51 amDEN - USM
3 stops31h 29mQatar Airways
Sun 11/165:40 pmUSM - DEN
3 stops34h 15mQatar Airways
Deal found 9/11$1,906
This Justfly.com deal was found by Cheapflights users on 9/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/135:55 pmDEN - USM
2 stops35h 20mSingapore Airlines
Wed 10/224:25 pmUSM - DEN
3 stops38h 54mSingapore Airlines
Deal found 9/9$2,022
This Qatar Airways deal was found by Cheapflights users on 9/9. 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.
Mon 10/131:40 pmDEN - USM
3 stops31h 30mQatar Airways
Wed 10/223:50 pmUSM - DEN
3 stops35h 08mQatar Airways
Deal found 9/9$2,174

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver 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 September 11, 2025.
Use the filters below to find and compare flights from Denver to Ko Samui that are best for you.

Fly from

Denver

Fly to

Ko Samui

Route

Depart

Return

Price

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Tue 2/10

7:05 pm-11:30 am

2 stops26h 25m

Ko Samui

Sun 3/29

8:50 pm-12:38 pm

2 stops28h 48m

$1,354

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Mon 10/13

6:14 pm-6:35 pm

2 stops35h 21m

Ko Samui

Wed 10/22

10:55 am-11:28 am

2 stops37h 33m

$1,599

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Fri 11/7

7:05 pm-11:50 am

2 stops26h 45m

Ko Samui

Sun 11/16

7:10 pm-12:37 pm

2 stops31h 27m

$1,655

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 10/25

7:55 pm-3:35 pm

3 stops30h 40m

Ko Samui

Sat 11/1

9:10 pm-1:37 pm

2 stops29h 27m

$1,676

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Thu 10/2

5:40 pm-9:10 pm

2 stops38h 30m

Ko Samui

Mon 10/6

4:25 pm-3:30 pm

2 stops36h 05m

$1,823

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 10/25

12:49 pm-10:35 am

3 stops32h 46m

Ko Samui

Sat 11/1

5:05 pm-2:58 pm

3 stops34h 53m

$1,899

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 11/22

10:30 pm-8:10 am

3 stops43h 40m

$542

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Fri 11/21

10:30 pm-7:10 am

3 stops42h 40m

$558

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Tue 11/25

10:30 pm-7:10 am

3 stops42h 40m

$564

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Thu 11/27

6:14 am-7:10 am

3 stops58h 56m

$577

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 14 results
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The best insider tips for Denver to Ko Samui flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Ko Samui trip
Airlines
Frontier

Frontier offers no in-flight entertainment or Wi-Fi. Bring a book or pre-load entertainment.


Frontier's UpFront Plus seats guarantee an empty middle seat for extra comfort.

Read more about Frontierby Marisa Garcia
United Airlines

United's Polaris Business Class offers lie-flat seats and Saks Fifth Avenue bedding.


United's Premium Plus includes extra legroom, upgraded meals, and two checked bags.

Read more about United Airlinesby Harriet Baskas
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Best time to book a flight from Denver to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Denver 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 Denver to Ko Samui

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

Find hourly flight availability from Denver 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 September 11, 2025.

It’s optimal to fly from Denver to Ko Samui in the afternoon. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight in the evening.

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

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

Travelers seeking maximum savings on their Denver to Ko Samui flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday mornings 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 Denver 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 Denver to Ko Samui?

    A quick flight from Denver to Ko Samui can take about 35h 21m. Cathay Pacific provides one of the quickest options available for as low as $1,599. Denver and Ko Samui are separated by a distance of 8668 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Denver 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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