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Ko Samui

$1,653+ Cheap flights from Denver (DEN) 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — USM
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$1,653
(Gurufare)
From Denver Intl to Ko Samui
Search Deals

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 June 12, 2025.

This Gurufare deal was found by Cheapflights users on 6/10. 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.
Mon 9/16:37 pmDEN - USM
2 stops34h 58mCathay Pacific
Mon 9/810:55 amUSM - DEN
2 stops44h 59mCathay Pacific
Deal found 6/10$1,653
This Gurufare deal was found by Cheapflights users on 6/10. 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.
Sat 12/62:30 pmDEN - USM
3 stops35h 10mMultiple Airlines
Sat 12/132:05 pmUSM - DEN
3 stops35h 34mMultiple Airlines
Deal found 6/10$1,715
This KAYAK deal was found by Cheapflights users on 6/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:30 pmDEN - USM
2 stops34h 40mSingapore Airlines
Sat 10/41:30 pmUSM - DEN
2 stops41h 49mSingapore Airlines
Deal found 6/11$1,779
This Qatar Airways deal was found by Cheapflights users on 6/11. 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.
Sat 9/202:30 pmDEN - USM
3 stops31h 35mQatar Airways
Sat 10/43:50 pmUSM - DEN
3 stops34h 33mQatar Airways
Deal found 6/11$2,118
This British Airways deal was found by Cheapflights users on 6/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/16:35 pmDEN - USM
2 stops37h 35mBritish Airways
Tue 7/84:25 pmUSM - DEN
2 stops37h 00mBritish Airways
Deal found 6/11$2,407
This Lufthansa deal was found by Cheapflights users on 6/12. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/54:15 pmDEN - USM
2 stops35h 50mLufthansa
Tue 8/261:30 pmUSM - DEN
2 stops37h 15mLufthansa
Deal found 6/12$5,842
This SWISS deal was found by Cheapflights users on 6/12. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/65:50 pmDEN - USM
2 stops62h 25mSWISS
Thu 8/214:25 pmUSM - DEN
2 stops36h 55mSWISS
Deal found 6/12$7,815

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 June 12, 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

Mon 9/1

6:37 pm-6:35 pm

2 stops34h 58m

Ko Samui

Mon 9/8

10:55 am-6:54 pm

2 stops44h 59m

$1,653

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 12/6

2:30 pm-3:40 pm

3 stops35h 10m

Ko Samui

Sat 12/13

2:05 pm-11:39 am

3 stops35h 34m

$1,715

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 9/20

9:30 pm-9:10 pm

2 stops34h 40m

Ko Samui

Sat 10/4

1:30 pm-6:19 pm

2 stops41h 49m

$1,779

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Sat 9/20

2:30 pm-11:05 am

3 stops31h 35m

Ko Samui

Sat 10/4

3:30 pm-1:23 pm

3 stops34h 53m

$2,118

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Tue 7/1

6:35 pm-9:10 pm

2 stops37h 35m

Ko Samui

Tue 7/8

4:25 pm-4:25 pm

2 stops37h 00m

$2,407

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Tue 8/5

4:15 pm-5:05 pm

2 stops35h 50m

Ko Samui

Tue 8/26

1:30 pm-1:45 pm

2 stops37h 15m

$5,842

DenverKo Samui

DEN - USM

DENUSM

Denver Intl

Wed 8/6

5:50 pm-9:15 pm

2 stops62h 25m

Ko Samui

Thu 8/21

4:25 pm-4:20 pm

2 stops36h 55m

$7,815

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 June 12, 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.

Rainfall in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ko Samui ranges from 2.3 - 19.3 inches per month. November is typically the wettest month, when rainfall can reach 19.3 in. February is typically the driest time to visit Ko Samui when rainfall is around 2.3 in.

Temperature in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ko Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).

Reviews of airlines servicing Ko Samui

Get insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated June 12, 2025.
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Singapore Airlines
8.1
Very good
1,302 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Cathay Pacific
7.6
Good
892 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
SWISS
7.5
Good
1,623 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Qatar Airways
7.4
Good
3,584 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Lufthansa
6.8
Okay
7,136 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Boarding

8.2

Comfort

7.9

Food

7.7

Overall

8.1

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

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.

  • 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.

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