$2,106+ Cheap flights from Ko Samui (USM) to Illinois
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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
USM — ORD
ene. 14 — ene. 211
1 adult, Economy
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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 Ko Samui to Illinois
Cheapest flights from Ko Samui to IllinoisExplore the most affordable flight options available from Ko Samui to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 15, 2025.
Explore the most affordable flight options available from Ko Samui to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 15, 2025.
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.
mar. 12/233:50 pmUSM - ORD
2 stops35h 40mMultiple Airlines
dom. 12/286:50 pmORD - USM
2 stops48h 00mMultiple Airlines
Deal found 12/15![Multiple Airlines logo]()
$2,106
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/235:25 pmUSM - ORD
2 stops32h 30mCathay Pacific
dom. 12/282:35 pmORD - USM
1 stop40h 00mCathay Pacific
Deal found 12/15![Cathay Pacific logo]()
$2,761
Find flight deals from Ko Samui to Illinois
Keep the following information in mind while searching for Ko Samui to Illinois flight deals. Data was last updated diciembre 15, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 1 star |
Round-trip from | $2,106 (oojo) |
Cheapflights Fare Finder
Customize your flight search to find flights from Ko Samui to Illinois 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 diciembre 15, 2025.
Use the filters below to find and compare flights from Ko Samui to Illinois that are best for you.
Fly from
Ko Samui
Fly to
Illinois
Route
Depart
Return
Price
Ko SamuiChicago
USM - ORD
USMORD
Ko Samui
mar. 12/23
3:50 pm-2:30 pm
2 stops35h 40m
Chicago O'Hare Intl
dom. 12/28
6:50 pm-7:50 am
2 stops48h 00m
$2,106
Ko SamuiChicago
USM - ORD
USMORD
Ko Samui
mar. 12/23
5:25 pm-12:55 pm
2 stops32h 30m
Chicago O'Hare Intl
dom. 12/28
2:35 pm-7:35 pm
1 stop40h 00m
$2,761
Best time to book a flight from Ko Samui to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Ko Samui 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 Ko Samui to Illinois
What is the cheapest time of day to fly from USM to IL?
Find hourly flight availability from Ko Samui to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 15, 2025.
When flying from Ko Samui to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 38% versus a flight in the afternoon.
What is the cheapest day to fly from Ko Samui to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Ko Samui to Illinois. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their Ko Samui to Illinois flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.