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$207+ Cheap flights from Illinois to Brussels

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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BRU
Aug 15 — Aug 221
Sat 8/15
Sat 8/22
1 adult, Economy
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Cheap flight deals from Illinois to Brussels

Cheapest flights from Illinois to Brussels
Explore the most affordable flight options available from Illinois to Brussels. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 16, 2026.

This Mytrip deal was found by Cheapflights users on 7/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/37:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Sun 10/181:50 pm
BRU
-
ORD
1 stop14h 35m
Icelandair
Deal found 7/13$456
This Ovago deal was found by Cheapflights users on 7/15. 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.
Wed 12/21:16 pm
ORD
-
BRU
2 stops13h 19m
Aer Lingus
Wed 12/910:15 am
BRU
-
ORD
2 stops16h 09m
Aer Lingus
Deal found 7/15$458
This Gotogate deal was found by Cheapflights users on 7/12. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Tue 10/2712:50 pm
BRU
-
ORD
1 stop11h 30m
Icelandair
Deal found 7/12$462
This Cheapflightsfares deal was found by Cheapflights users on 7/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Sun 10/2512:50 pm
BRU
-
ORD
1 stop11h 30m
Icelandair
Deal found 7/14$466
This oojo deal was found by Cheapflights users on 7/15. 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.
Sat 9/267:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Sun 10/41:50 pm
BRU
-
ORD
1 stop11h 25m
Icelandair
Deal found 7/15$467
This Kiwi.com deal was found by Cheapflights users on 7/10. 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 10/77:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Fri 10/161:50 pm
BRU
-
ORD
1 stop11h 25m
Icelandair
Deal found 7/10$488
This Kiwi.com deal was found by Cheapflights users on 7/12. 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.
Mon 11/26:30 pm
ORD
-
BRU
1 stop10h 25m
Icelandair
Tue 11/1012:50 pm
BRU
-
ORD
1 stop11h 30m
Icelandair
Deal found 7/12$489
This Icelandair deal was found by Cheapflights users on 7/15. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/37:25 pm
ORD
-
BRU
1 stop10h 30m
Icelandair
Thu 10/151:50 pm
BRU
-
ORD
1 stop11h 25m
Icelandair
Deal found 7/15$490
This Mytrip deal was found by Cheapflights users on 7/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/247:25 pm
ORD
-
CRL
2 stops18h 10m
Multiple Airlines
Sun 8/309:05 am
CRL
-
ORD
2 stops19h 20m
Multiple Airlines
Deal found 7/15$668
This Justfly.com deal was found by Cheapflights users on 7/12. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/94:05 pm
STL
-
BRU
2 stops33h 50m
Air Canada
Wed 11/2510:00 am
BRU
-
STL
2 stops33h 06m
Air Canada
Deal found 7/12$727
This Mytrip deal was found by Cheapflights users on 7/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:25 pm
ORD
-
CRL
2 stops20h 30m
Multiple Airlines
Tue 9/14:00 pm
CRL
-
ORD
2 stops33h 15m
Multiple Airlines
Deal found 7/11$732
This United Airlines deal was found by Cheapflights users on 7/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:15 pm
STL
-
BRU
2 stops15h 00m
United Airlines
Wed 11/258:25 am
BRU
-
STL
1 stop12h 20m
United Airlines
Deal found 7/12$740

Find flight deals from Illinois to Brussels

Keep the following information in mind while searching for Illinois to Brussels flight deals. Data was last updated July 16, 2026.

Round-trip from

$456
(Mytrip)

One-way from

$207
(Flightnetwork)

Popular in

June

Cheapest in

February

Average price

$836
From Illinois to Brussels
Search Deals
One-way flight from Illinois to Brussels
Search Deals
Highest demand for flights based on searches. 30% potential increase in price ($375 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($74 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Brussels 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 July 16, 2026.
Use the filters below to find and compare flights from Illinois to Brussels that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 11/9

4:05 pm-8:55 am

2 stops33h 50m

Brussels Bruxelles-National

Wed 11/25

10:00 am-12:06 pm

2 stops33h 06m

$727

ChicagoBrussels

ORD - BRU

ORDBRU

Chicago O'Hare Intl

Wed 9/16

8:10 pm-10:10 am

1 stop31h 00m

Brussels Bruxelles-National

Tue 9/22

7:20 am-9:40 am

1 stop33h 20m

$730

ChicagoBrussels

ORD - BRU

ORDBRU

Chicago O'Hare Intl

Thu 10/1

7:25 pm-12:55 pm

1 stop10h 30m

Brussels Bruxelles-National

Sat 10/17

1:50 pm-6:15 pm

1 stop11h 25m

$742

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 11/9

1:08 pm-8:55 am

1 stop12h 47m

Brussels Bruxelles-National

Wed 11/25

8:25 am-1:45 pm

1 stop12h 20m

$743

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 11/29

8:33 am-8:55 am

1 stop17h 22m

Brussels Bruxelles-National

Wed 12/2

4:55 pm-9:13 pm

2 stops35h 18m

$768

ChicagoBrussels

ORD - CRL

ORDCRL

Chicago O'Hare Intl

Tue 9/15

9:30 pm-12:30 pm

1 stop32h 00m

Charleroi Brussels

Wed 9/30

9:45 pm-5:50 pm

2 stops27h 05m

$777

ChicagoBrussels

ORD - CRL

ORDCRL

Chicago O'Hare Intl

Wed 9/16

9:30 pm-12:30 pm

1 stop32h 00m

Charleroi Brussels

Sat 9/26

7:50 pm-5:50 pm

2 stops29h 00m

$778

ChicagoBrussels

ORD - BRU

ORDBRU

Chicago O'Hare Intl

Wed 12/2

1:55 pm-1:15 pm

2 stops16h 20m

Brussels Bruxelles-National

Wed 12/9

10:00 am-7:52 pm

1 stop16h 52m

$785

ChicagoBrussels

ORD - BRU

ORDBRU

Chicago O'Hare Intl

Thu 11/12

11:45 am-2:15 pm

1 stop19h 30m

Brussels Bruxelles-National

Sun 11/22

6:30 am-6:20 pm

1 stop18h 50m

$790

ChicagoBrussels

ORD - BRU

ORDBRU

Chicago O'Hare Intl

Fri 11/6

12:45 pm-10:20 pm

1 stop26h 35m

Brussels Bruxelles-National

Thu 11/12

6:30 am-6:20 pm

1 stop18h 50m

$800

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/15

Showing 1-10 of 56 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Brussels

Have a flexible travel schedule? Discover the best time to fly to Brussels 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 Brussels

What is the cheapest month to book a flight from Illinois to Brussels?

Currently, May is the cheapest month in which you can book a flight from Illinois to Brussels (average of $129). Flying from Illinois to Brussels in June is currently the most expensive (average of $748). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to BRU?

Find hourly flight availability from Illinois to Brussels. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 16, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Brussels as you normally would.

Weekly flight availability from Illinois to Brussels

Explore weekly flight availability from Illinois to Brussels. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 16, 2026.

The most flights from USIL to BR1 are scheduled on a Monday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Illinois to Brussels?

How far ahead should I book a flight from Illinois to Brussels?

Booking 33 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Brussels. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

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

  • How long is the flight from Illinois to Brussels?

    Air Canada, Turkish Airlines, and Icelandair can get you from Illinois to Brussels in just under 10h 30m. Your travel time can differ by up to 23h 20m. The distance between Illinois and Brussels is about 4145 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to Brussels one-way?

    For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as $263. Users have also found prices from $309 and $362 on TAP AIR PORTUGAL and Scandinavian Airlines, respectively.

  • What are the most popular routes from Illinois to Brussels?

    The most popular flight routes from Illinois to Brussels are Chicago O'Hare Intl - Brussels Bruxelles-National, Chicago Midway - Brussels Bruxelles-National and Chicago O'Hare Intl - Charleroi Brussels.

  • What are the most reliable airlines from Illinois to Brussels?

    Consider Air Canada (56%), Austrian Airlines (56%) or Brussels Airlines (56%) when booking your flight. These represent the most reliable airlines when flying from Illinois to Brussels.

  • What are the cheapest flights from Illinois to Brussels?

    Looking at all options, your cheapest flight can be booked for $797. While the most popular route (Chicago O'Hare Intl - Brussels Bruxelles-National) can be booked for $467 on average, our data indicates $3,184 when flying from Illinois to Brussels.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from Illinois to Brussels?

    Currently, May is the cheapest month in which you can book a flight from Illinois to Brussels (average of $129). Flying from Illinois to Brussels in June is currently the most expensive (average of $748). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from Illinois to Brussels

Discover the top 8 airlines that operate flights from Illinois to Brussels. 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 July 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$418Average$617FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$444Average$463FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$448Average$629FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$531Average$751FlexibilityNo cancel feeOn-timeN/A
Turkish AirlinesCheapest$582Average$709FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$692Average$1,253FlexibilityNo cancel feeOn-time69%
Brussels AirlinesCheapest$752Average$1,765FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$969Average$1,369FlexibilityNo cancel feeOn-time76%

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