$836+ 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — USM
Jan 16 — Jan 231
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Illinois to Ko Samui with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Ko Samui
Best flights from Illinois to Ko SamuiDiscover carefully curated flight deals from Illinois to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 17, 2025.
Discover carefully curated flight deals from Illinois to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 17, 2025.
This FlightHub deal was found by Cheapflights users on 12/16. 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 amORD - USM
2 stops27h 05mEVA Air
Tue 4/78:35 pmUSM - ORD
2 stops36h 25mEVA Air
Deal found 12/16![EVA Air logo]()
$1,050
This oojo deal was found by Cheapflights users on 12/15. 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 3/89:20 pmORD - USM
2 stops26h 35mMultiple Airlines
Wed 3/186:40 pmUSM - ORD
2 stops28h 25mMultiple Airlines
Deal found 12/15![Multiple Airlines logo]()
$1,104
This Ovago deal was found by Cheapflights users on 12/15. 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.
Sun 3/83:35 pmORD - USM
1 stop40h 00mCathay Pacific
Wed 3/1811:40 amUSM - ORD
1 stop38h 15mCathay Pacific
Deal found 12/15![Cathay Pacific logo]()
$1,397
This FlightHub deal was found by Cheapflights users on 12/16. 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 3/1512:30 amORD - USM
2 stops26h 25mEVA Air
Sun 3/228:20 pmUSM - ORD
2 stops36h 15mEVA Air
Deal found 12/16![EVA Air logo]()
$1,078
This IEagle deal was found by Cheapflights users on 12/15. 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.
Fri 1/3011:30 pmORD - USM
2 stops27h 55mEVA Air
Fri 2/69:20 amUSM - ORD
2 stops23h 15mEVA Air
Deal found 12/15![EVA Air logo]()
$1,202
This Booking.com deal was found by Cheapflights users on 12/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/163:35 pmORD - USM
1 stop40h 00mMultiple Airlines
Sun 3/227:00 pmUSM - ORD
2 stops30h 55mMultiple Airlines
Deal found 12/16![Multiple Airlines logo]()
$1,365
This oojo deal was found by Cheapflights users on 12/15. 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 2/811:30 pmORD - USM
2 stops27h 10mEVA Air
Sun 2/228:30 pmUSM - ORD
2 stops36h 05mEVA Air
Deal found 12/15![EVA Air logo]()
$1,225
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 December 17, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $1,047 (Turkish Airlines) |
One-way from | $836 (FlightHub) |
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 December 17, 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 3/9
12:30 am-3:35 pm
2 stops27h 05m
Ko Samui
Tue 4/7
8:35 pm-9:00 pm
2 stops36h 25m
$1,050
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sun 3/15
12:30 am-2:55 pm
2 stops26h 25m
Ko Samui
Sun 3/22
8:20 pm-8:35 pm
2 stops36h 15m
$1,078
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sun 3/8
9:20 pm-11:55 am
2 stops26h 35m
Ko Samui
Wed 3/18
6:40 pm-11:05 am
2 stops28h 25m
$1,104
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Fri 1/30
11:30 pm-4:25 pm
2 stops27h 55m
Ko Samui
Fri 2/6
9:20 am-7:35 pm
2 stops23h 15m
$1,202
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sun 2/8
11:30 pm-3:40 pm
2 stops27h 10m
Ko Samui
Sun 2/22
8:30 pm-7:35 pm
2 stops36h 05m
$1,225
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Mon 3/16
3:35 pm-7:35 pm
1 stop40h 00m
Ko Samui
Sun 3/22
7:00 pm-1:55 pm
2 stops30h 55m
$1,365
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Sun 3/8
3:35 pm-7:35 pm
1 stop40h 00m
Ko Samui
Wed 3/18
11:40 am-1:55 pm
1 stop38h 15m
$1,397
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Wed 12/31
11:30 pm-7:30 am
2 stops43h 00m
$836
ChicagoKo Samui
ORD - USM
ORDUSM
Chicago O'Hare Intl
Wed 12/31
2:35 pm-7:35 pm
1 stop40h 00m
$3,635
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 December 17, 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
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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 December 17, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$1,103 | Average$1,218 | FlexibilityNo cancel fee | On-time74% |