The cheapest times to fly from DTW to USM are

  • February 19th to March 25th (except the week of March 12th)
  • April 30th to July 8th (except the week of May 7th)
  • October 8th to January 14th (except the weeks of October 15th and December 24th)

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 DTW to USM is late May. Prices can be as high as $10600 for Friday flights during early to mid August, or as low as $1702 for Saturday flights around late May.


When to Fly to Ko Samui

Flying from Detroit, MI (DTW) to Koh Samui (USM) will usually cost between $1989 to $6567 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late May with an average ticket price of $2208. Due to high demand the most expensive time to fly is early to mid August, with an average price of $6625. Planning your trip to low-cost times can easily save you $4417 on economy flights and even more on first-class flights. Generally, any price below $2885 can be considered a good price for a round-trip DTW to USM flight.

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

DTW to USM Flight Prices

Compared to other flights, the DTW to USM flight is more expensive than the average and costs more than the average flight leaving from Detroit. The average price per mile (for a direct flight) is $0.2, 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 DTW. Fridays are the most expensive days to fly to Ko Samui, and Saturdays are the most expensive days to return to Detroit. Selecting flights on the least expensive days could save you up to $798 (17%) 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 $3365. Return trip prices are from the USM to DTW 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 DTW 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 55 minutes may not be realistic.


Flight Hacking DTW 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 DTW to USM — but Champion Traveler does!

Hack #1: Bangkok (DTW > BKK > USM)

  • Price for both tickets: $1367
  • Average savings: $1518 (52.62%)

See DTW to BKK flights

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

  • Price for both tickets: $1388
  • Average savings: $1498 (51.91%)

See DTW to LAX flights

Hack #3: Houston, TX (DTW > IAH > USM)

  • Price for both tickets: $1399
  • Average savings: $1487 (51.53%)

See DTW to IAH flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 18 major airlines flying this route most often: Air Canada, Air France, Asiana, Bangkok Airways, British Airways, Cathay Pacific, China Southern, Delta, Emirates, Finnair, JAL, Kenya Airways, KLM, Lufthansa, Singapore Airlines, Turkish Airlines, United, Vietnam Airlines, and potentially more during busy seasons.

How far away is it from Samui Airport to Detroit Metro Wayne County Airport?

The distance between the two airports is roughly 8852 miles or 14246 kilometers.

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

The real-world flight time for a nonstop DTW to USM flight is about 16 hour 55 minutes.

How many flights go between Detroit, MI and Koh Samui?

It depends on the day of the week and the date, but a typical day might have around 6 available flights from DTW to USM.


Airport Location Info


Departing Airport

Origination codeDTW
Origination airport nameDetroit Metro Wayne County Airport
CityDetroit, MI
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.