Cheap flights from Illinois to Brussels from $237

In general, April is the cheapest month to fly from Illinois to Brussels. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $647. If you are unable to visit Brussels during the month of April, then departing from Illinois during the month February is also very affordable. Most momondo users find prices during this month for around $665.

On average, the least expensive day to fly to Brussels from Illinois is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $1,102. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,428.

According to our data, the cheapest time of day to fly to Brussels is in the evening. momondo users have found flights departing from Illinois to Brussels in the evening for as low as $1,233. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $1,277.

Fly from Chicago O'Hare Intl to Brussels Bruxelles-National for the best Illinois - Brussels flight prices

You are more likely to see cheaper flights to Brussels from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Brussels for around $862 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Brussels from Illinois for as low as $591 on momondo.

There are 3 cabin classes available to choose from on Illinois to Brussels flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Turkish Airlines, United Airlines, and KLM are the most popular carriers operating from Illinois to Brussels

United Airlines, Scandinavian Airlines and Icelandair are the top three most popular airlines that fly to Brussels from Illinois according to our data. United Airlines is the first choice among our users, with 35% of people opting to fly with this airline when traveling to Brussels. Keep in mind that there are 8 different airlines that fly to Brussels on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Brussels is 4 per day as of August 2026. The most frequent departure time is 6:00PM, with 100% of daily flights leaving in the evening.

As of August 2026, 33 flights take off from Illinois and land in Brussels each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.