HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Kos

$645+ Cheap flights from Illinois to Kos (KGS)

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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — KGS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Kos 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 Kos

Cheapest flights from Illinois to Kos
Explore the most affordable flight options available from Illinois to Kos. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This FlightHub deal was found by Cheapflights users on 1/28. 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 8/247:05 pm
ORD
-
KGS
1 stop16h 35m
SWISS
Sun 9/133:15 pm
KGS
-
ORD
1 stop32h 40m
SWISS
Deal found 1/28$645
This Expedia deal was found by Cheapflights users on 1/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/242:15 pm
ORD
-
KGS
2 stops36h 10m
Multiple Airlines
Sun 9/133:15 pm
KGS
-
ORD
1 stop29h 20m
Multiple Airlines
Deal found 1/28$777
This KAYAK deal was found by Cheapflights users on 1/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:30 pm
ORD
-
KGS
2 stops39h 20m
Austrian Airlines
Sun 9/1310:00 am
KGS
-
ORD
2 stops38h 37m
Austrian Airlines
Deal found 1/28$948
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:00 pm
ORD
-
KGS
1 stop17h 50m
Multiple Airlines
Mon 7/1311:40 pm
KGS
-
ORD
1 stop21h 30m
Multiple Airlines
Deal found 1/28$1,173
This Trip.com deal was found by Cheapflights users on 1/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/1510:50 pm
ORD
-
KGS
2 stops26h 15m
Multiple Airlines
Sat 3/218:35 pm
KGS
-
ORD
2 stops51h 45m
Multiple Airlines
Deal found 1/27$1,199
This SWISS deal was found by Cheapflights users on 1/28. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/292:20 pm
ORD
-
KGS
1 stop21h 20m
SWISS
Mon 7/1311:00 am
KGS
-
ORD
1 stop33h 35m
SWISS
Deal found 1/28$1,215
This SWISS deal was found by Cheapflights users on 1/28. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:20 pm
ORD
-
KGS
1 stop21h 35m
SWISS
Thu 7/211:00 am
KGS
-
ORD
1 stop33h 35m
SWISS
Deal found 1/28$1,219
This SWISS deal was found by Cheapflights users on 1/28. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/307:05 pm
ORD
-
KGS
1 stop31h 05m
SWISS
Mon 7/1311:00 am
KGS
-
ORD
1 stop33h 35m
SWISS
Deal found 1/28$1,233
This SWISS deal was found by Cheapflights users on 1/28. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/227:05 pm
ORD
-
KGS
1 stop16h 35m
SWISS
Thu 7/211:00 am
KGS
-
ORD
1 stop33h 35m
SWISS
Deal found 1/28$1,264
This Lufthansa deal was found by Cheapflights users on 1/28. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/214:20 pm
ORD
-
KGS
1 stop19h 40m
Multiple Airlines
Sat 7/48:35 pm
KGS
-
ORD
1 stop29h 40m
Multiple Airlines
Deal found 1/28$1,287

Find flight deals from Illinois to Kos

Keep the following information in mind while searching for Illinois to Kos flight deals. Data was last updated January 29, 2026.

Round-trip from

$1,173
(Kiwi.com)
From Illinois to Kos
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Kos 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 January 29, 2026.
Use the filters below to find and compare flights from Illinois to Kos that are best for you.

Fly from

Illinois

Fly to

Kos

Route

Depart

Return

Price

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Sun 3/15

10:50 pm-8:05 am

2 stops26h 15m

Kos

Sat 3/21

8:35 pm-5:20 pm

2 stops51h 45m

$1,199

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Mon 6/29

2:20 pm-7:40 pm

1 stop21h 20m

Kos

Mon 7/13

11:00 am-12:35 pm

1 stop33h 35m

$1,215

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Tue 6/30

7:05 pm-10:10 am

1 stop31h 05m

Kos

Mon 7/13

11:00 am-12:35 pm

1 stop33h 35m

$1,233

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Tue 6/23

2:20 pm-7:55 pm

1 stop21h 35m

Kos

Sat 7/4

8:45 pm-3:55 pm

1 stop27h 10m

$1,264

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Sun 6/28

4:20 pm-8:00 pm

1 stop19h 40m

Kos

Mon 7/13

11:15 am-12:55 pm

1 stop33h 40m

$1,296

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Mon 6/29

7:05 pm-7:40 pm

1 stop16h 35m

Kos

Thu 7/9

11:00 am-3:55 pm

1 stop36h 55m

$1,301

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Tue 6/30

7:05 pm-10:10 am

1 stop31h 05m

Kos

Wed 7/15

8:40 pm-3:55 pm

1 stop27h 15m

$1,301

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Mon 6/29

2:20 pm-7:40 pm

1 stop21h 20m

Kos

Wed 7/15

8:40 pm-3:55 pm

1 stop27h 15m

$1,301

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Mon 6/29

2:20 pm-7:40 pm

1 stop21h 20m

Kos

Sun 7/12

3:15 pm-12:35 pm

1 stop29h 20m

$1,307

ChicagoKos

ORD - KGS

ORDKGS

Chicago O'Hare Intl

Mon 6/29

2:20 pm-7:40 pm

1 stop21h 20m

Kos

Sat 7/11

8:45 pm-12:35 pm

1 stop23h 50m

$1,308

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 12 results
1
2

Best time to book a flight from Illinois to Kos

Have a flexible travel schedule? Discover the best time to fly to Kos 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 Kos
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Kos. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Kos from Illinois?

    Located just 12.8 mi from the city center, Kos (KGS) is the airport most travelers will use when flying to Kos from Illinois.

  • How long is the flight from Illinois to Kos?

    There are many flights that can get you from Illinois to Kos in 21h 20m. Fly via SWISS to get the fastest option. The distance from Illinois to Kos is about 5622 mi.

  • Can I find deals for flights from Illinois to Kos that include hotel bookings?

    Yes. In addition to deals on Illinois to Kos flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Kos?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Kos.

  • Can I find deals for business class flights from Illinois to Kos?

    Yes. Cheapflights offers flight deals from Illinois to Kos by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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 Kos

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Santorini flights
John F Kennedy Intl to Mykonos flights
Newark to Mykonos flights
Newark to Santorini flights
LaGuardia to Mykonos flights
LaGuardia to Santorini flights
Dallas/Fort Worth to Santorini flights
Reagan-National to Santorini flights
Dulles Intl to Santorini flights
Boston to Santorini flights
Boston to Mykonos flights
Dulles Intl to Mykonos flights
Newark to Rhodes flights
John F Kennedy Intl to Rhodes flights
Baltimore to Santorini flights
Dallas/Fort Worth to Mykonos flights
Los Angeles to Santorini flights
Hobby to Santorini flights
Reagan-National to Mykonos flights
Baltimore to Mykonos flights
Seattle to Santorini flights
Seattle to Rhodes flights
Detroit to Santorini flights
George Bush Intcntl to Santorini flights
San Francisco to Santorini flights
Hobby to Mykonos flights
Atlanta to Santorini flights
Charlotte to Santorini flights
Dulles Intl to Rhodes flights
Orlando to Santorini flights
O'Hare Intl to Santorini flights
St. Louis to Santorini flights
LaGuardia to Rhodes flights
George Bush Intcntl to Mykonos flights
O'Hare Intl to Mykonos flights
Los Angeles to Mykonos flights
Philadelphia to Santorini flights
Atlanta to Mykonos flights
Miami to Santorini flights
Philadelphia to Mykonos flights
Denver to Mykonos flights
Las Vegas to Santorini flights
Detroit to Mykonos flights
Dulles Intl to Kos flights
San Francisco to Mykonos flights
Denver to Santorini flights
Minneapolis to Santorini flights
Tampa to Santorini flights
John F Kennedy Intl to Kos flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.