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.
$1,515+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — USM
Jan 11 — Jan 181
1 adult, Economy
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Find cheap flights from Denver to Ko Samui with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Denver to Ko Samui
Best flights from Denver to Ko SamuiDiscover carefully curated flight deals from Denver to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.
Discover carefully curated flight deals from Denver to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.
This Cathay Pacific deal was found by Cheapflights users on 12/10. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/228:30 amDEN - USM
2 stops45h 05mMultiple Airlines
Tue 1/2711:40 amUSM - DEN
2 stops38h 38mMultiple Airlines
Deal found 12/10![Multiple Airlines logo]()
$1,515
This oojo deal was found by Cheapflights users on 12/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/248:44 amDEN - USM
2 stops44h 51mCathay Pacific
Sat 1/3111:40 amUSM - DEN
2 stops38h 38mCathay Pacific
Deal found 12/10![Cathay Pacific logo]()
$1,593
This Qatar Airways deal was found by Cheapflights users on 12/10. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1011:35 amDEN - USM
3 stops33h 00mQatar Airways
Sun 3/293:50 pmUSM - DEN
3 stops34h 54mQatar Airways
Deal found 12/10![Qatar Airways logo]()
$1,938
This Mytrip deal was found by Cheapflights users on 12/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/248:05 amDEN - USM
3 stops34h 05mMultiple Airlines
Sat 1/313:05 pmUSM - DEN
3 stops35h 32mMultiple Airlines
Deal found 12/10![Multiple Airlines logo]()
$1,571
This Qatar Airways deal was found by Cheapflights users on 12/10. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2212:34 pmDEN - USM
3 stops32h 01mQatar Airways
Tue 1/273:50 pmUSM - DEN
3 stops34h 12mQatar Airways
Deal found 12/10![Qatar Airways logo]()
$2,038
This FlightHub deal was found by Cheapflights users on 12/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/107:05 pmDEN - USM
2 stops25h 30mMultiple Airlines
Sun 3/299:00 pmUSM - DEN
2 stops28h 38mMultiple Airlines
Deal found 12/10![Multiple Airlines logo]()
$2,169
Find 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 December 12, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $1,515 (Cathay Pacific) |
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 December 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
Thu 1/22
8:30 am-7:35 pm
2 stops45h 05m
Ko Samui
Tue 1/27
11:40 am-12:18 pm
2 stops38h 38m
$1,515
DenverKo Samui
DEN - USM
DENUSM
Denver Intl
Sat 1/24
8:05 am-8:10 am
3 stops34h 05m
Ko Samui
Sat 1/31
3:05 pm-12:37 pm
3 stops35h 32m
$1,571
DenverKo Samui
DEN - USM
DENUSM
Denver Intl
Sat 1/24
8:44 am-7:35 pm
2 stops44h 51m
Ko Samui
Sat 1/31
11:40 am-12:18 pm
2 stops38h 38m
$1,593
DenverKo Samui
DEN - USM
DENUSM
Denver Intl
Tue 2/10
11:35 am-10:35 am
3 stops33h 00m
Ko Samui
Sun 3/29
3:50 pm-1:44 pm
3 stops34h 54m
$1,938
DenverKo Samui
DEN - USM
DENUSM
Denver Intl
Thu 1/22
12:34 pm-10:35 am
3 stops32h 01m
Ko Samui
Tue 1/27
3:50 pm-12:02 pm
3 stops34h 12m
$2,038
DenverKo Samui
DEN - USM
DENUSM
Denver Intl
Tue 2/10
7:05 pm-10:35 am
2 stops25h 30m
Ko Samui
Sun 3/29
9:00 pm-12:38 pm
2 stops28h 38m
$2,169
Compare providers for flights from Denver 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 Denver to Ko Samui in December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Denver-Ko Samui flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Denver-Ko Samui flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Denver-Ko Samui flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-Ko Samui flights, Cheapflights users trust eDreams the most. eDreams 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 Denver-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 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
Prices
Delays
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 December 12, 2025.
It’s optimal to fly from Denver to Ko Samui in the afternoon. By choosing this option you can save up to 44% 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.
How often are flights from Denver to Ko Samui delayed?
About 19% of weekly flights between Denver and Ko Samui have experienced delays in the past year, with the average delay time being 128 minutes.
What is the most punctual flight time for Denver to Ko Samui flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Denver to Ko Samui flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 13% of flights being delayed.
The best insider tips for Denver to Ko Samui flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Ko Samui trip
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.
Traveling to a place near Ko Samui?
Book flights to Ko Samui if you plan to visit one of these locationsKo Tao
Ko Pha Ngan