$522 Cheap Flights from Chicago (ORD) to Samui Intl. Airport (USM)

View $522 flight on Tue, Oct 7, 2025Opens in a new window

Popular airlines from Chicago O'Hare Intl. Airport (ORD) to Samui Intl. Airport (USM)

Cheap Flights from Chicago to Samui Intl. Airport (ORD-USM)

Prices were available within the past 7 days and start at $522 for one-way flights and $652 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Sep 8 - Mon, Sep 29
ORD
Chicago
USM
Koh Samui
$652 Roundtrip, found 6 hours ago
$652
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Sep 8 from Chicago to Koh Samui, returning Mon, Sep 29, priced at $652 found 6 hours ago
United
Wed, Aug 13 - Sun, Aug 24
ORD
Chicago
USM
Koh Samui
$660 Roundtrip, found 2 days ago
$660
Roundtrip
found 2 days ago
Select United flight, departing Wed, Aug 13 from Chicago to Koh Samui, returning Sun, Aug 24, priced at $660 found 2 days ago
United
Mon, Sep 8 - Mon, Sep 29
ORD
Chicago
USM
Koh Samui
$671 Roundtrip, found 6 hours ago
$671
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Sep 8 from Chicago to Koh Samui, returning Mon, Sep 29, priced at $671 found 6 hours ago
United
Sat, Aug 23 - Mon, Aug 25
ORD
Chicago
USM
Koh Samui
$701 Roundtrip, found 2 days ago
$701
Roundtrip
found 2 days ago
Select United flight, departing Sat, Aug 23 from Chicago to Koh Samui, returning Mon, Aug 25, priced at $701 found 2 days ago
United
Fri, Aug 22 - Tue, Aug 26
ORD
Chicago
USM
Koh Samui
$702 Roundtrip, found 5 days ago
$702
Roundtrip
found 5 days ago
Select United flight, departing Fri, Aug 22 from Chicago to Koh Samui, returning Tue, Aug 26, priced at $702 found 5 days ago
United
Sat, Aug 16 - Wed, Aug 27
ORD
Chicago
USM
Koh Samui
$714 Roundtrip, found 3 days ago
$714
Roundtrip
found 3 days ago
Select United flight, departing Sat, Aug 16 from Chicago to Koh Samui, returning Wed, Aug 27, priced at $714 found 3 days ago
Turkish Airlines
Sun, Sep 7 - Wed, Oct 1
ORD
Chicago
USM
Koh Samui
$1,096 Roundtrip, found 10 hours ago
$1,096
Roundtrip
found 10 hours ago
Select Turkish Airlines flight, departing Sun, Sep 7 from Chicago to Koh Samui, returning Wed, Oct 1, priced at $1,096 found 10 hours ago
EVA Airways
Wed, Sep 17 - Tue, Sep 30
ORD
Chicago
USM
Koh Samui
$1,184 Roundtrip, found 4 hours ago
$1,184
Roundtrip
found 4 hours ago
Select EVA Airways flight, departing Wed, Sep 17 from Chicago to Koh Samui, returning Tue, Sep 30, priced at $1,184 found 4 hours ago
Qatar Airways
Mon, Sep 8 - Tue, Sep 16
ORD
Chicago
USM
Koh Samui
$1,252 Roundtrip, found 4 days ago
$1,252
Roundtrip
found 4 days ago
Select Qatar Airways flight, departing Mon, Sep 8 from Chicago to Koh Samui, returning Tue, Sep 16, priced at $1,252 found 4 days ago
Etihad Airways
Wed, Sep 17 - Tue, Sep 30
ORD
Chicago
USM
Koh Samui
$1,382 Roundtrip, found 4 hours ago
$1,382
Roundtrip
found 4 hours ago
Select Etihad Airways flight, departing Wed, Sep 17 from Chicago to Koh Samui, returning Tue, Sep 30, priced at $1,382 found 4 hours ago

Alternative airports near Koh Samui

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Samui Intl. Airport USM. Cheapest and Closest option available. Average driving time to city center is 31 minutes. Flights from $1,384
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $1,384
Flights from Chicago (ORD) to Samui Intl. Airport (USM)
Origin airport
O'Hare Intl.
Destination airport
Samui Intl. Airport
Airlines serving
Air France, Austrian Airlines, British Airways, Cathay Pacific, EVA Airways, Etihad Airways, Finnair, KLM, Qatar Airways, Swiss International Air Lines, Turkish Airlines
Roundtrip price
$651
Distance
8840 mi

Chicago to Samui Intl. Airport Flights

The cheapest times to fly from Chicago to Samui Intl. Airport

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Chicago to Samui Intl. Airport are during the month of September. You can find some of the cheapest flights from Chicago to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Chicago to Samui Intl. Airport

Sunday is one of the best days to book for cheap flights from Chicago to Samui Intl. Airport: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Chicago to Samui Intl. Airport

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Chicago to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $522 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Chicago to Samui Intl. Airport flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Chicago to Samui Intl. Airport airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM) cost?
Secure a cheap one-way flight from $522 or cheap return flight from $652 from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM)?
The cheapest month to fly from ORD to USM is September, when demand is low. Off-peak season is typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM)?
To find the cheapest airline that'll fly you from ORD to USM, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM)?
Direct flights from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ORD to USM?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM)?
To avoid possible delays on the O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM) route, aim to travel before 3 PM. Later flights have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM) last-minute?
Booking your flight from ORD to USM shortly before your getaway is typically more expensive. But if you're flexible with your departure times and dates, you could grab a cheap last-minute fare.
Is it cheaper to book an ORD to USM flight and hotel package?
You'll generally save money by securing an ORD to USM flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've selected your preferred flights and accommodations, consider adding extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from O'Hare Intl. Airport (ORD) to Ko Samui Airport (USM)?
Typically, it's possible to cancel or reschedule your ORD to USM flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.