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Ko Samui

$649+ Cheap flights from Illinois 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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — USM
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Illinois to Ko Samui

Cheapest flights from Illinois to Ko Samui
Explore the most affordable flight options available from Illinois to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This FlightHub deal was found by Cheapflights users on 1/28. 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 stops27h 10m
EVA Air
Tue 12/87:00 am
USM
-
ORD
2 stops25h 35m
EVA Air
Deal found 1/28$985
This oojo deal was found by Cheapflights users on 1/28. 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.
Tue 4/148:10 pm
ORD
-
USM
2 stops29h 00m
Turkish Airlines
Tue 4/211:30 pm
USM
-
ORD
2 stops32h 10m
Turkish Airlines
Deal found 1/28$986
This FlightHub deal was found by Cheapflights users on 1/28. 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 3/187:55 am
USM
-
ORD
2 stops24h 40m
EVA Air
Deal found 1/28$990
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 2/2411:30 pm
ORD
-
USM
2 stops29h 20m
EVA Air
Tue 3/37:35 pm
USM
-
ORD
2 stops37h 00m
EVA Air
Deal found 1/27$1,042
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.
Mon 3/912:30 am
ORD
-
USM
2 stops27h 55m
EVA Air
Tue 4/77:55 pm
USM
-
ORD
2 stops37h 05m
EVA Air
Deal found 1/27$1,050
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
Sun 11/299:10 pm
USM
-
ORD
2 stops35h 25m
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 1/27. 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 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 stops30h 55m
Multiple Airlines
Wed 3/187:00 pm
USM
-
ORD
2 stops28h 05m
Multiple Airlines
Deal found 1/27$1,074
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.
Sat 3/711:30 pm
ORD
-
USM
2 stops28h 30m
EVA Air
Sun 3/158:30 pm
USM
-
ORD
2 stops36h 05m
EVA Air
Deal found 1/26$1,079
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.
Sat 11/2111:30 pm
ORD
-
USM
2 stops27h 05m
EVA Air
Mon 11/3010:00 am
USM
-
ORD
2 stops22h 35m
EVA Air
Deal found 1/27$1,088
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.
Sun 11/2211:30 pm
ORD
-
USM
2 stops31h 55m
EVA Air
Tue 12/19:20 am
USM
-
ORD
2 stops23h 15m
EVA Air
Deal found 1/27$1,095

Find flight deals from Illinois to Ko Samui

Keep the following information in mind while searching for Illinois to Ko Samui flight deals. Data was last updated January 29, 2026.

Most accurate provider

Ovago
2 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$986
(oojo)

One-way from

$649
(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 Illinois to Ko Samui
Search Deals
One-way flight from Illinois to Ko Samui
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois 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 29, 2026.
Use the filters below to find and compare flights from Illinois to Ko Samui that are best for you.

Fly from

Illinois

Fly to

Ko Samui

Route

Depart

Return

Price

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 4/14

8:10 pm-1:10 pm

2 stops29h 00m

Ko Samui

Tue 4/21

1:30 pm-9:40 am

2 stops32h 10m

$986

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 3/11

12:30 am-7:45 am

2 stops43h 15m

Ko Samui

Wed 3/18

7:55 am-8:35 pm

2 stops24h 40m

$990

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 2/24

11:30 pm-5:50 pm

2 stops29h 20m

Ko Samui

Tue 3/3

7:35 pm-7:35 pm

2 stops37h 00m

$1,042

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Mon 3/9

12:30 am-4:25 pm

2 stops27h 55m

Ko Samui

Tue 4/7

7:55 pm-9:00 pm

2 stops37h 05m

$1,050

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 3/8

12:50 pm-7:45 am

2 stops30h 55m

Ko Samui

Wed 3/18

7:00 pm-11:05 am

2 stops28h 05m

$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

Sun 3/15

2:10 pm-8:25 am

2 stops30h 15m

Ko Samui

Sun 3/22

7:00 pm-8:35 am

2 stops49h 35m

$1,095

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 2/11

8:20 pm-11:50 am

2 stops26h 30m

Ko Samui

Sat 2/21

8:15 am-10:05 am

2 stops38h 50m

$1,542

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 2/14

11:30 pm-7:50 pm

2 stops31h 20m

$649

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 2/14

6:51 pm-7:30 am

3 stops47h 39m

$688

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 11 results
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Best time to book a flight from Illinois to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Illinois 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 Illinois to Ko Samui

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

Find hourly flight availability from Illinois 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 29, 2026.

One of the essential ways to save on airfare from Illinois 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 Illinois to Ko Samui?

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

Travelers seeking maximum savings on their Illinois 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 much does it cost to fly round-trip from Illinois to Ko Samui?

Related info for your journey

Find useful and relevant information for your journey from Illinois 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 Illinois?

    Most people fly into Ko Samui (USM) if they book a flight to Ko Samui from Illinois. Ko Samui is conveniently located just 2.1 mi from Ko Samui’s city center.

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

    For as low as $986, Turkish Airlines can have you in Ko Samui from Illinois in 29h. The distance between Illinois and Ko Samui is about 8835 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Illinois to Ko Samui

Discover the top airline that operate flights from Illinois 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 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
EVA AirCheapest$1,098Average$1,218FlexibilityNo cancel feeOn-time74%

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