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Ko Samui

$935+ Cheap flights from Chicago (CHI) to Ko Samui (USM)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — USM
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Find cheap flights from Chicago to Ko Samui with Cheapflights

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Cheap 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 January 27, 2026.

This Gurufare deal was found by Cheapflights users on 1/25. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/311:05 am
ORD
-
USM
2 stops28h 40m
Multiple Airlines
Tue 9/87:10 pm
USM
-
ORD
2 stops25h 55m
Multiple Airlines
Deal found 1/25$935
This FlightHub deal was found by Cheapflights users on 1/27. 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.
Tue 11/2411:30 pm
ORD
-
USM
2 stops26h 25m
EVA Air
Tue 12/87:00 am
USM
-
ORD
2 stops25h 35m
EVA Air
Deal found 1/27$985
This FlightHub deal was found by Cheapflights users on 1/25. 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.
Wed 3/1112:30 am
ORD
-
USM
2 stops43h 15m
EVA Air
Wed 3/188:30 am
USM
-
ORD
2 stops24h 05m
EVA Air
Deal found 1/25$989
This IEagle deal was found by Cheapflights users on 1/25. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1012:30 am
ORD
-
USM
2 stops27h 10m
EVA Air
Wed 3/189:00 am
USM
-
ORD
2 stops23h 35m
EVA Air
Deal found 1/25$1,022
This FlightHub deal was found by Cheapflights users on 1/26. 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.
Mon 3/912:30 am
ORD
-
USM
2 stops27h 10m
EVA Air
Tue 4/79:00 pm
USM
-
ORD
2 stops36h 00m
EVA Air
Deal found 1/26$1,041
This FlightHub deal was found by Cheapflights users on 1/25. 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.
Mon 3/211:30 pm
ORD
-
USM
2 stops29h 10m
EVA Air
Thu 3/57:15 am
USM
-
ORD
2 stops25h 20m
EVA Air
Deal found 1/25$1,042
This EVA Air deal was found by Cheapflights users on 1/26. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:30 am
ORD
-
USM
2 stops26h 25m
EVA Air
Sun 11/19:10 pm
USM
-
ORD
2 stops35h 25m
EVA Air
Deal found 1/26$1,054
This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1811:30 pm
ORD
-
USM
2 stops31h 55m
EVA Air
Tue 12/18:20 pm
USM
-
ORD
2 stops36h 15m
EVA Air
Deal found 1/27$1,055
This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1811:30 pm
ORD
-
USM
2 stops31h 55m
EVA Air
Sat 11/289:10 pm
USM
-
ORD
2 stops59h 25m
EVA Air
Deal found 1/27$1,066
This oojo deal was found by Cheapflights users on 1/25. 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 3/812:50 pm
ORD
-
USM
2 stops33h 50m
Multiple Airlines
Wed 3/186:15 pm
USM
-
ORD
2 stops28h 50m
Multiple Airlines
Deal found 1/25$1,074
This oojo deal was found by Cheapflights users on 1/25. 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 11/19:20 pm
ORD
-
USM
2 stops24h 20m
Multiple Airlines
Sat 11/77:35 pm
USM
-
ORD
2 stops27h 30m
Multiple Airlines
Deal found 1/25$1,075

Find 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 January 27, 2026.

Most accurate provider

Ovago
2 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$989
(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
Search Deals

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 January 27, 2026.
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

Tue 3/10

12:30 am-3:40 pm

2 stops27h 10m

Ko Samui

Wed 3/18

9:00 am-8:35 pm

2 stops23h 35m

$1,022

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Mon 3/9

12:30 am-3:35 pm

2 stops27h 05m

Ko Samui

Tue 4/7

9:00 pm-9:00 pm

2 stops36h 00m

$1,041

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Mon 3/2

11:30 pm-5:40 pm

2 stops29h 10m

Ko Samui

Thu 3/5

7:15 am-7:35 pm

2 stops25h 20m

$1,042

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 3/8

12:50 pm-10:40 am

2 stops33h 50m

Ko Samui

Wed 3/18

6:15 pm-11:05 am

2 stops28h 50m

$1,074

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 3/7

11:30 pm-5:00 pm

2 stops28h 30m

Ko Samui

Sun 3/15

8:30 pm-8:35 pm

2 stops36h 05m

$1,079

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Fri 2/27

8:20 pm-6:15 pm

2 stops56h 55m

Ko Samui

Thu 3/12

4:25 pm-7:25 pm

2 stops39h 00m

$1,108

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 3/11

12:30 am-5:00 pm

2 stops28h 30m

Ko Samui

Thu 3/19

7:55 am-8:35 pm

2 stops24h 40m

$1,117

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 2/10

8:20 pm-9:05 pm

2 stops35h 45m

Ko Samui

Fri 2/20

4:25 pm-10:05 am

2 stops54h 40m

$1,307

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 3/28

12:30 am-3:45 pm

2 stops27h 15m

Ko Samui

Sat 4/4

8:35 pm-9:00 pm

2 stops60h 25m

$1,385

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Chicago-Ko Samui flight deals on Cheapflights vs. Ovago 90-95% 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 Ovago the most. Ovago 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 January 27, 2026.

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 19% of weekly flights between Chicago and Ko Samui have experienced delays in the past year, with the average delay time being 127 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?

Saturday 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, Spirit Airlines have had the lowest number of delays on this route, with just 12% of flights being delayed.

Reviews of airlines servicing Ko Samui

Get insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated January 27, 2026.
Peruse reviews from past customers who have flown with EVA Air from Chicago to Ko Samui to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,333 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Overall

8.4

Crew

8.6

Food

8.1

Reviews

1 / 20
6.0
Good

Hannah,Jan 2026

TPE - SFO

I like the flight attendants the most. The are very helpful.
EVA Air
8.4
Very good
1,333 reviews
EVA Air
8.4
Very good
1,333 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Overall

8.4

Crew

8.6

Food

8.1

Reviews

1 / 20
6.0
Good

Hannah,Jan 2026

TPE - SFO

I like the flight attendants the most. The are very helpful.

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 27h 10m. 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 ($1,098), 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,098Average$1,218FlexibilityNo cancel feeOn-time74%

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