The cheapest times to fly from ORD to USM are

  • March 5th to May 20th (except the week of March 19th)
  • July 30th to December 2nd (except the weeks of October 29th and November 19th)

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 ORD to USM is mid to late September. Prices can be as high as $10721 for Monday flights during late December, or as low as $871 for Thursday flights around mid to late September.


When to Fly to Ko Samui

Flying from Chicago, IL (ORD) to Koh Samui (USM) will usually cost between $892 to $6811 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late September with an average ticket price of $929. Due to high demand the most expensive time to fly is late December, with an average price of $5312. Planning your trip to low-cost times can easily save you $4383 on economy flights and even more on first-class flights. Generally, any price below $1409 can be considered a good price for a round-trip ORD to USM flight.

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

ORD to USM Flight Prices

Compared to other flights, the ORD to USM flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Chicago. The average price per mile (for a direct flight) is $0.1, which is far below average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to depart and return on this flight. Mondays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $1231 (45%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $1066. Return trip prices are from the USM to ORD 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 ORD to USM can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 16 hour 54 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 ORD to USM while comparing.

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

  • 124 miles (200 km) away from USM
  • Usually 2.02% less expensive than USM
  • 1-layover flights available

See ORD to KBV flights


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

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

  • Price for both tickets: $963
  • Average savings: $447 (31.69%)

See ORD to BKK flights

Hack #2: Phuket (ORD > HKT > USM)

  • Price for both tickets: $1090
  • Average savings: $319 (22.64%)

See ORD to HKT flights

Hack #3: Kuala Lumpur (ORD > KUL > USM)

  • Price for both tickets: $1139
  • Average savings: $270 (19.16%)

See ORD to KUL flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 27 major airlines flying this route most often: Air Canada, Air France, Alaska, American, ANA, Austrian, Bangkok Airways, British Airways, Cathay Dragon, Cathay Pacific, China Airlines, China Southern, Emirates, Ethiopian, Etihad, EVA Air, Finnair, Hainan, JAL, KLM, Lufthansa, Malaysia Airlines, Qatar Airways, Singapore Airlines, SWISS, THAI, United, and potentially more during busy seasons.

How far away is it from Samui Airport to Chicago O’Hare International Airport?

The distance between the two airports is roughly 8839 miles or 14225 kilometers.

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

The real-world flight time for a nonstop ORD to USM flight is about 16 hour 54 minutes.

How many flights go between Chicago, IL and Koh Samui?

It depends on the day of the week and the date, but a typical day might have around 58 available flights from ORD to USM.


Airport Location Info


Departing Airport

Origination code ORD
Origination airport name Chicago O’Hare International Airport
City Chicago, IL
Country the United States
Latitude 42
Longitude -87.9

Return Airport

Destination code USM
Destination airport name Samui Airport
City Koh Samui
Country Thailand
Latitude 9.5
Longitude 100.1


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.