The cheapest times to fly from USM to ORD are

  • March 12th to June 24th (except the weeks of April 9th, April 16th, April 30th, and May 7th)
  • July 30th to November 25th (except the weeks of September 24th and October 1st)

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 USM to ORD is early to mid September. Prices can be as high as $4795 for Monday flights during early January, or as low as $1056 for Thursday flights around early to mid September.


When to Fly to Chicago

Flying from Koh Samui (USM) to Chicago, IL (ORD) will usually cost between $1189 to $3009 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid September with an average ticket price of $1155. Due to high demand the most expensive time to fly is early January, with an average price of $2790. Planning your trip to low-cost times can easily save you $1635 on economy flights and even more on first-class flights. Generally, any price below $1733 can be considered a good price for a round-trip USM to ORD flight.

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

USM to ORD Flight Prices

Compared to other flights, the USM to ORD flight is more expensive than the average and costs about as much as the average flight leaving from Ko Samui. The average price per mile (for a direct flight) is $0.12, 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 $1422. Return trip prices are from the ORD to USM 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 USM to ORD 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.


Flight Hacking USM to ORD

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 USM to ORD — but Champion Traveler does!

Hack #1: Hong Kong (USM > HKG > ORD)

  • Price for both tickets: $1241
  • Average savings: $492 (28.37%)

See USM to BKK flights

Hack #2: Bangkok (USM > BKK > ORD)

  • Price for both tickets: $1266
  • Average savings: $467 (26.93%)

See USM to HKG flights

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

  • Price for both tickets: $1277
  • Average savings: $456 (26.32%)

See USM to KUL flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 32 major airlines flying this route most often: Air Canada, Air China, Air Dolomiti, Air France, Alaska, American, ANA, Austrian, Bangkok Airways, British Airways, Cathay Dragon, Cathay Pacific, China Eastern, China Southern, Emirates, Ethiopian, Etihad, EVA Air, Finnair, Hainan, JAL, KLM, Lufthansa, Malaysia Airlines, Qatar Airways, Shanghai Airlines, Shenzhen, Singapore Airlines, SWISS, THAI, United, Xiamen, and potentially more during busy seasons.

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

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

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

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

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

It depends on the day of the week and the date, but a typical day might have around 68 available flights from USM to ORD.


Airport Location Info


Departing Airport

Origination codeUSM
Origination airport nameSamui Airport
CityKoh Samui

Return Airport

Destination codeORD
Destination airport nameChicago O’Hare International Airport
CityChicago, IL
Countrythe United States


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.