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Ko Samui

$827+ Cheap flights from Chicago (CHI) to Ko Samui (USM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — USM
Dec 24 — Dec 311
Wed 12/24
Wed 12/31
1 adult, Economy
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Find flight deals from Chicago to Ko Samui

Cheapest flights from Chicago to Ko Samui
Explore the most affordable flight options available from Chicago to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 24, 2025.

This FlightHub deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/711:30 pmORD - USM
2 stops27h 05mEVA Air
Fri 12/267:55 amUSM - ORD
2 stops24h 40mEVA Air
Deal found 11/23$1,497
This oojo deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/72:35 pmORD - USM
1 stop40h 00mCathay Pacific
Fri 12/268:30 amUSM - ORD
2 stops41h 25mCathay Pacific
Deal found 11/23$2,200

Cheap flight deals from Chicago to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Ko Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 24, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,030
(oojo)

One-way from

$827
(FlightHub)
Provider with most accurate pricing for Chicago (CHI)-Ko Samui flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Ko Samui flights.
Search Deals
From Chicago (CHI) to Ko Samui
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One-way flight from Chicago (CHI) to Ko Samui
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Chicago to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 24, 2025.
Use the filters below to find and compare flights from Chicago to Ko Samui that are best for you.

Fly from

Chicago

Fly to

Ko Samui

Route

Depart

Return

Price

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 4/25

12:30 am-1:45 pm

2 stops25h 15m

Ko Samui

Thu 5/7

8:00 am-9:00 pm

2 stops25h 00m

$1,070

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 3/7

8:20 pm-7:10 am

2 stops45h 50m

Ko Samui

Sat 3/14

9:10 pm-7:25 pm

2 stops34h 15m

$1,084

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 3/4

11:30 pm-2:55 pm

2 stops26h 25m

Ko Samui

Mon 3/9

10:00 am-8:35 pm

2 stops22h 35m

$1,089

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Mon 2/2

11:30 pm-4:40 pm

2 stops28h 10m

Ko Samui

Mon 2/16

9:20 am-7:35 pm

2 stops23h 15m

$1,089

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Thu 2/19

11:30 pm-8:05 am

2 stops43h 35m

Ko Samui

Sun 3/15

7:35 pm-8:35 pm

2 stops37h 00m

$1,102

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 3/14

12:30 am-3:35 pm

2 stops27h 05m

Ko Samui

Thu 3/19

7:00 am-8:35 pm

2 stops25h 35m

$1,142

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Thu 2/19

11:30 pm-8:10 am

2 stops43h 40m

Ko Samui

Mon 3/9

7:55 am-8:35 pm

2 stops24h 40m

$1,162

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 3/10

12:50 pm-7:30 am

2 stops30h 40m

Ko Samui

Tue 4/7

8:20 am-9:40 am

2 stops37h 20m

$1,180

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 3/15

9:20 pm-5:50 pm

2 stops32h 30m

Ko Samui

Thu 3/19

5:40 pm-11:05 am

2 stops29h 25m

$1,197

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 12/31

11:30 pm-9:20 pm

2 stops32h 50m

$827

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/23

Showing 1-10 of 12 results
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Compare providers for flights from Chicago to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Ko Samui in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-Ko Samui flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Chicago-Ko Samui flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Chicago-Ko Samui flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-Ko Samui flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Chicago to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Chicago with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Chicago to Ko Samui

What is the cheapest time of day to fly from CHI to USM?

Find hourly flight availability from Chicago to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 24, 2025.

One of the essential ways to save on airfare from Chicago to Ko Samui is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 30% on airfare.

What is the cheapest day to fly from Chicago to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Chicago to Ko Samui flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How often are flights from Chicago to Ko Samui delayed?

About 15% of weekly flights between Chicago and Ko Samui have experienced delays in the past year, with the average delay time being 120 minutes.

What is the most punctual flight time for Chicago to Ko Samui flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to Ko Samui flights?

Over the last year, Atlas Air have had the lowest number of delays on this route, with no flights being classified as delayed.

Related info for your journey

Find useful and relevant information for your journey from Chicago to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ko Samui from Chicago?

    Ko Samui (USM), located 2.1 mi from the city center, is the airport you fly into when you book flights from Chicago to Ko Samui. 1 airline have flights to Ko Samui from Chicago on a regular basis. Booking flights from Chicago to Ko Samui should not be difficult; the airport handles an average of 0 inbound flights from Chicago per day.

  • How long is the flight from Chicago to Ko Samui?

    EVA Air can get you from Chicago to Ko Samui in just under 25h 15m. Your travel time can differ by up to . Chicago and Ko Samui are separated by a distance of 8835 mi.

  • What is the cheapest airline to fly from Chicago to Ko Samui round-trip?

    According to our current data, EVA Air ($1,112), offers the cheapest pricing from Chicago to Ko Samui.

  • Can I find deals for flights from Chicago to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Chicago to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Ko Samui.

  • Can I find deals for business class flights from Chicago to Ko Samui?

    Yes. Cheapflights offers flight deals from Chicago to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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Top airline flying from Chicago to Ko Samui

Discover the top airline that operate flights from Chicago to Ko Samui. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,112Average$1,258FlexibilityNo cancel feeOn-time74%

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