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Cheap flights from Chicago to Ko Samui from $642

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Ko Samui departing on 8/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Chicago to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:15 pm - 7:10 am
ORD
-
USM
26h 55m
2 stops
Multiple Airlines Logo
7:50 am - 1:55 pm
USM
-
ORD
42h 05m
2 stops
$1,118Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
EVA Air Logo
12:30 am - 3:10 pm
ORD
-
USM
26h 40m
2 stops
EVA Air Logo
7:45 pm - 8:45 pm
USM
-
ORD
37h 00m
2 stops
$1,286EVA Air
Tue, Sep 8 - Sun, Sep 13
EVA Air Logo
12:30 am - 5:40 pm
ORD
-
USM
29h 10m
2 stops
EVA Air Logo
7:55 am - 7:35 pm
USM
-
ORD
24h 40m
2 stops
$1,376EVA Air
Wed, Oct 28 - Mon, Nov 2
EVA Air Logo
12:30 am - 1:45 pm
ORD
-
USM
25h 15m
2 stops
EVA Air Logo
7:50 pm - 9:10 pm
USM
-
ORD
37h 20m
2 stops
$1,459EVA Air
Sat, Aug 22 - Sat, Aug 29
Cathay Pacific Logo
4:15 pm - 7:40 pm
ORD
-
USM
39h 25m
1 stop
Cathay Pacific Logo
11:55 am - 1:55 pm
USM
-
ORD
38h 00m
1 stop
$1,576Cathay Pacific
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
4:15 pm - 7:40 pm
ORD
-
USM
39h 25m
1 stop
Multiple Airlines Logo
2:00 pm - 1:55 pm
USM
-
ORD
35h 55m
2 stops
$1,602Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
EVA Air Logo
12:30 am - 9:35 pm
ORD
-
USM
33h 05m
2 stops
EVA Air Logo
6:00 am - 9:10 pm
USM
-
ORD
27h 10m
2 stops
$1,650EVA Air
Sun, Jul 5 - Wed, Jul 15
EVA Air Logo
12:30 am - 3:10 pm
ORD
-
USM
26h 40m
2 stops
EVA Air Logo
2:00 pm - 5:41 am
USM
-
ORD
27h 41m
3 stops
$1,663EVA Air
Sat, Aug 22 - Sat, Aug 29
Cathay Pacific Logo
4:00 pm - 7:40 pm
ORD
-
USM
39h 40m
1 stop
Cathay Pacific Logo
11:55 am - 2:20 pm
USM
-
ORD
38h 25m
1 stop
$1,781Cathay Pacific
Sun, Aug 23 - Sat, Aug 29
Qatar Airways Logo
7:20 pm - 10:45 am
ORD
-
USM
27h 25m
2 stops
Qatar Airways Logo
1:30 pm - 3:05 pm
USM
-
ORD
37h 35m
2 stops
$1,799Qatar Airways
Tue, Jun 16 - Tue, Jun 23

EVA Air flights from Chicago to Ko Samui

Our best EVA Air deals on Chicago to Ko Samui flight tickets
EVA Air
Sep 8
ORD12:30 amChicago O'Hare Intl
26h 40m
2 stops
USM3:10 pmKo Samui
Sep 13
USM7:45 pmKo Samui
37h 00m
2 stops
ORD8:45 pmChicago O'Hare Intl
$1,286
EVA Air
Oct 28
ORD12:30 amChicago O'Hare Intl
29h 10m
2 stops
USM5:40 pmKo Samui
Nov 2
USM7:55 amKo Samui
24h 40m
2 stops
ORD7:35 pmChicago O'Hare Intl
$1,376
EVA Air
Aug 22
ORD12:30 amChicago O'Hare Intl
25h 15m
2 stops
USM1:45 pmKo Samui
Aug 29
USM7:50 pmKo Samui
37h 20m
2 stops
ORD9:10 pmChicago O'Hare Intl
$1,459

Cathay Pacific flights from Chicago to Ko Samui

Our best Cathay Pacific deals on Chicago to Ko Samui flight tickets
Cathay Pacific
Sep 20
ORD4:15 pmChicago O'Hare Intl
39h 25m
1 stop
USM7:40 pmKo Samui
Sep 27
USM11:55 amKo Samui
38h 00m
1 stop
ORD1:55 pmChicago O'Hare Intl
$1,576
Cathay Pacific
Aug 23
ORD4:00 pmChicago O'Hare Intl
39h 40m
1 stop
USM7:40 pmKo Samui
Aug 29
USM11:55 amKo Samui
38h 25m
1 stop
ORD2:20 pmChicago O'Hare Intl
$1,781
Cathay Pacific
Aug 23
ORD4:00 pmChicago O'Hare Intl
27h 35m
2 stops
USM7:35 amKo Samui
Aug 29
USM11:55 amKo Samui
38h 25m
1 stop
ORD2:20 pmChicago O'Hare Intl
$1,824

momondo Fare Finder

 
Customize your flight search to find flights from Chicago 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, momondo users made 832,500 searches. Data last updated May 20, 2026.
Use the filters below to find and compare flights from Chicago to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 9/20

4:15 pm-7:10 am

2 stops26h 55m

Ko Samui

Sun 9/27

7:50 am-1:55 pm

2 stops42h 05m

$1,118

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 9/8

12:30 am-3:10 pm

2 stops26h 40m

Ko Samui

Sun 9/13

7:45 pm-8:45 pm

2 stops37h 00m

$1,286
Quickest round-trip

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Wed 10/28

12:30 am-5:40 pm

2 stops29h 10m

Ko Samui

Mon 11/2

7:55 am-7:35 pm

2 stops24h 40m

$1,376

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 8/22

12:30 am-1:45 pm

2 stops25h 15m

Ko Samui

Sat 8/29

7:50 pm-9:10 pm

2 stops37h 20m

$1,459

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 9/20

4:15 pm-7:40 pm

1 stop39h 25m

Ko Samui

Sun 9/27

11:55 am-1:55 pm

1 stop38h 00m

$1,576

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 9/20

4:15 pm-7:40 pm

1 stop39h 25m

Ko Samui

Sun 9/27

2:00 pm-1:55 pm

2 stops35h 55m

$1,602

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 7/5

12:30 am-9:35 pm

2 stops33h 05m

Ko Samui

Wed 7/15

6:00 am-9:10 pm

2 stops27h 10m

$1,650

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sat 8/22

12:30 am-3:10 pm

2 stops26h 40m

Ko Samui

Sat 8/29

2:00 pm-5:41 am

3 stops27h 41m

$1,663

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Sun 8/23

4:00 pm-7:40 pm

1 stop39h 40m

Ko Samui

Sat 8/29

11:55 am-2:20 pm

1 stop38h 25m

$1,781

ChicagoKo Samui

ORD - USM

ORDUSM

Chicago O'Hare Intl

Tue 6/16

7:20 pm-10:45 am

2 stops27h 25m

Ko Samui

Tue 6/23

1:30 pm-3:05 pm

2 stops37h 35m

$1,799

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Ko Samui from

How to get the cheapest flight ticket from Chicago to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

How often are flights from Chicago to Ko Samui delayed?

Historically, on average around 23% of flights between Chicago and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 133 minutes.

What is the most punctual flight time for Chicago to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Chicago to Ko Samui flights?

According to our data, JetBlue have had the least number of delays on this route over the last 12 months; with about 21% of their flights experiencing any sort of delay.

When to book flights from Chicago to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago to Ko Samui (CHI to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Ko Samui

Fastest flight time

25h 55m

Direct flights

None
The fastest flight from Chicago to Ko Samui takes 25h 55m
There are no direct flights from Chicago to Ko Samui. There are no popular flight routes from Chicago to Ko Samui.
Search flight deals

Frequently asked questions about flying from Chicago to Ko Samui

  • How far is Chicago to Ko Samui by plane?

    There are 8846.2 mi between Chicago and Ko Samui. 25h 55m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Chicago to Ko Samui Airport?

    Prices for flights from Chicago to Ko Samui Airport were last updated today.

  • How old do you have to be to fly from Chicago to Ko Samui Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Chicago to Ko Samui?

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Ko Samui?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Ko Samui. momondo saves you time and could save you money on your trip.

Can I find flights from Chicago to Ko Samui with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Ko Samui from Chicago with this policy.

How can momondo help me find flights from Chicago to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from Chicago.

I’m not ready to book a flight from Chicago to Ko Samui right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Ko Samui from Chicago. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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