The cheapest times to fly from ORD to KOS are

  • January 1st to March 18th
  • May 14th to July 29th
  • September 10th to October 7th

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 KOS is early to mid July. Prices can be as high as $13000 for Thursday flights during early May, or as low as $1145 for Friday flights around early to mid July.


When to Fly to Sihanoukville

Flying from Chicago, IL (ORD) to Kompongsom (KOS) will usually cost between $1505 to $7631 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid July with an average ticket price of $1539. Due to high demand the most expensive time to fly is early May, with an average price of $7795. Planning your trip to low-cost times can easily save you $6257 on economy flights and even more on first-class flights. Generally, any price below $5480 can be considered a good price for a round-trip ORD to KOS flight.

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

ORD to KOS Flight Prices

Compared to other flights, the ORD to KOS flight is more expensive than the average and costs more than the average flight leaving from Chicago. The average price per mile (for a direct flight) is $0.39, which is a bit above average.


Flight Prices by Day of the Week

Friday is usually the cheapest day to depart and return on this flight. Thursdays are the most expensive days to fly to Sihanoukville, and Saturdays are the most expensive days to return to Chicago. Selecting flights on the least expensive days could save you up to $2065 (33%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Friday and returning a week later will cost an average of $4126. Return trip prices are from the KOS 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 KOS 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 42 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 KOS while comparing.

Destination alternative #1: Phnom Penh International Airport (PNH) in Phnom Penh

  • 102 miles (164 km) away from KOS
  • Usually 82.14% less expensive than KOS
  • 1-layover flights available

See ORD to PNH flights

Destination alternative #2: Phu Quoc International Airport (PQC) in Phu Quoc

  • 36 miles (58 km) away from KOS
  • Usually 71.95% less expensive than KOS
  • 1-layover flights available

See ORD to PQC flights


Flight Hacking ORD to KOS

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 KOS — but Champion Traveler does!

Hack #1: Kuala Lumpur (ORD > KUL > KOS)

  • Price for both tickets: $898
  • Average savings: $4582 (83.61%)

See ORD to KUL flights

Hack #2: Ho Chi Minh City (ORD > SGN > KOS)

  • Price for both tickets: $1076
  • Average savings: $4405 (80.37%)

See ORD to SGN flights

Hack #3: San Francisco, CA (ORD > SFO > KOS)

  • Price for both tickets: $1280
  • Average savings: $4201 (76.65%)

See ORD to SFO flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 15 major airlines flying this route most often: Air Canada, American, ANA, China Airlines, China Southern, Delta, EVA Air, Hainan, JAL, KLM, Shenzhen, Sichuan Airlines, United, Vietnam Airlines, Xiamen, and potentially more during busy seasons.

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

The distance between the two airports is roughly 8729 miles or 14048 kilometers.

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

The real-world flight time for a nonstop ORD to KOS flight is about 16 hour 42 minutes.

How many flights go between Chicago, IL and Kompongsom?

It depends on the day of the week and the date, but a typical day might have around 9 available flights from ORD to KOS.


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 KOS
Destination airport name Kompongsom Airport
City Kompongsom
Country Cambodia
Latitude 10.6
Longitude 103.7


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.