$604+ 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 2/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — USM
Nov 29 — Dec 61
1 adult, Economy
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Cheapest flights from Illinois to Ko SamuiExplore 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 October 30, 2025.
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 October 30, 2025.
This Gotogate deal was found by Cheapflights users on 10/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1010:20 amORD - USM
2 stops32h 50mMultiple Airlines
Sun 11/237:00 pmUSM - ORD
2 stops32h 41mMultiple Airlines
Deal found 10/29![Multiple Airlines logo]()
$1,058
This FlightHub deal was found by Cheapflights users on 10/29. 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 11/1211:30 pmORD - USM
2 stops27h 05mEVA Air
Fri 11/217:55 amUSM - ORD
2 stops24h 40mEVA Air
Deal found 10/29![EVA Air logo]()
$1,076
This EVA Air deal was found by Cheapflights users on 10/29. 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.
Thu 11/1311:30 pmORD - USM
2 stops28h 30mEVA Air
Mon 11/178:30 amUSM - ORD
2 stops24h 05mEVA Air
Deal found 10/29![EVA Air logo]()
$1,103
This FlightHub deal was found by Cheapflights users on 10/30. 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.
Fri 11/2811:30 pmORD - USM
2 stops27h 05mEVA Air
Fri 12/59:20 amUSM - ORD
2 stops23h 15mEVA Air
Deal found 10/30![EVA Air logo]()
$1,186
This lol.travel deal was found by Cheapflights users on 10/29. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/102:35 pmORD - USM
1 stop40h 00mCathay Pacific
Sun 11/2311:40 amUSM - ORD
1 stop38h 15mCathay Pacific
Deal found 10/29![Cathay Pacific logo]()
$1,330
This Ovago deal was found by Cheapflights users on 10/29. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/122:35 pmORD - USM
1 stop40h 00mCathay Pacific
Fri 11/2111:40 amUSM - ORD
1 stop38h 15mCathay Pacific
Deal found 10/29![Cathay Pacific logo]()
$1,398
This oojo deal was found by Cheapflights users on 10/29. 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.
Wed 11/122:35 pmORD - USM
1 stop40h 00mMultiple Airlines
Fri 11/212:05 pmUSM - ORD
2 stops35h 50mMultiple Airlines
Deal found 10/29![Multiple Airlines logo]()
$1,413
Cheap 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 October 30, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $1,038 (FlightHub) |
One-way from | $604 (Kiwi.com) |
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 October 30, 2025.
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
Mon 11/10
10:20 am-8:10 am
2 stops32h 50m
Ko Samui
Sun 11/23
7:00 pm-2:41 pm
2 stops32h 41m
$1,058
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Wed 11/12
11:30 pm-2:55 pm
2 stops26h 25m
Ko Samui
Fri 11/21
7:55 am-7:35 pm
2 stops24h 40m
$1,076
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Thu 11/13
11:30 pm-5:00 pm
2 stops28h 30m
Ko Samui
Mon 11/17
8:30 am-7:35 pm
2 stops24h 05m
$1,103
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sat 1/24
11:30 pm-3:35 pm
2 stops27h 05m
Ko Samui
Thu 2/5
8:30 am-7:35 pm
2 stops24h 05m
$1,134
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sat 1/24
11:30 pm-3:35 pm
2 stops27h 05m
Ko Samui
Fri 2/6
10:00 am-7:35 pm
2 stops22h 35m
$1,174
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Fri 11/28
11:30 pm-3:35 pm
2 stops27h 05m
Ko Samui
Fri 12/5
9:20 am-7:35 pm
2 stops23h 15m
$1,186
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sat 1/10
11:50 am-10:40 am
2 stops33h 50m
Ko Samui
Sun 1/18
1:25 pm-10:05 am
2 stops33h 40m
$1,274
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sat 1/10
8:20 pm-5:50 pm
2 stops32h 30m
Ko Samui
Sun 1/18
1:25 pm-10:05 am
2 stops33h 40m
$1,375
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Fri 2/13
1:30 pm-10:40 am
2 stops32h 10m
$604
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 October 30, 2025.
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.
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.
Traveling to a place near Ko Samui?
Book flights to Ko Samui if you plan to visit one of these locationsKo Tao
Ko Pha Ngan
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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.
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 October 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$1,112 | Average$1,258 | FlexibilityNo cancel fee | On-time74% |