The cheapest times to fly from DEN to USM are

  • May 7th to July 22nd
  • November 5th to March 18th (except the weeks of November 12th, December 10th, December 17th, January 15th, and March 5th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from DEN to USM is mid May. Prices can be as high as $9129 for Thursday flights during early September, or as low as $1567 for Saturday flights around mid May.


When to Fly to Ko Samui

Flying from Denver, CO (DEN) to Koh Samui (USM) will usually cost between $1894 to $6772 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid May with an average ticket price of $1745. Due to high demand the most expensive time to fly is early September, with an average price of $7125. Planning your trip to low-cost times can easily save you $5380 on economy flights and even more on first-class flights. Generally, any price below $3336 can be considered a good price for a round-trip DEN to USM flight.

See below for a graph of average weekly prices for the DEN to USM route. All prices are for round-trip tickets in USD.

DEN to USM Flight Prices

Compared to other flights, the DEN to USM flight is more expensive than the average and costs more than the average flight leaving from Denver. The average price per mile (for a direct flight) is $0.24, which is below average.


Flight Prices by Day of the Week

Saturday is usually the cheapest day to fly to USM, and Monday the cheapest day to fly back into DEN. Thursdays are the most expensive days to fly to Ko Samui, and Sundays are the most expensive days to return to Denver. Selecting flights on the least expensive days could save you up to $426 (11%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Saturday and returning a week later will cost an average of $3297. Return trip prices are from the USM to DEN flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from DEN to USM can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 16 hour 35 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from DEN to USM while comparing.

Destination alternative #1: Krabi Airport (KBV) in Krabi

  • 124 miles (200 km) away from USM
  • Usually 39.81% less expensive than USM
  • 2-layover flights available

See DEN to KBV flights


Flight Hacking DEN to USM

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from DEN to USM — but Champion Traveler does!

Hack #1: Phuket (DEN > HKT > USM)

  • Price for both tickets: $1212
  • Average savings: $2124 (63.66%)

See DEN to HKT flights

Hack #2: Los Angeles, CA (DEN > LAX > USM)

  • Price for both tickets: $1258
  • Average savings: $2078 (62.3%)

See DEN to LAX flights

Hack #3: Seattle, WA (DEN > SEA > USM)

  • Price for both tickets: $1270
  • Average savings: $2066 (61.94%)

See DEN to SEA flights


Flight Questions Answered

Still have questions about flying from DEN to USM? We’ve got answers.

Which airlines fly this route?

You can find 16 major airlines flying this route most often: Air Canada, Air France, Alaska, American, Austrian, Bangkok Airways, British Airways, Cathay Pacific, China Airlines, Delta, Finnair, Frontier, JAL, Qantas, Singapore Airlines, United, and potentially more during busy seasons.

How far away is it from Samui Airport to Denver International Airport?

The distance between the two airports is roughly 8672 miles or 13956 kilometers.

How long does it take to fly from DEN to USM?

The real-world flight time for a nonstop DEN to USM flight is about 16 hour 35 minutes.

How many flights go between Denver, CO and Koh Samui?

It depends on the day of the week and the date, but a typical day might have around 10 available flights from DEN to USM.


Airport Location Info


Departing Airport

Origination codeDEN
Origination airport nameDenver International Airport
CityDenver, CO
Countrythe United States

Return Airport

Destination codeUSM
Destination airport nameSamui Airport
CityKoh Samui


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.