Cheap flights from Illinois to Belgium from $237

In general, April is the cheapest month to fly from Illinois to Belgium. 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 Belgium during the month of April, then departing from Illinois during the month November is also very affordable. Most momondo users find prices during this month for around $663.

Our data shows that Tuesday is the least expensive day to fly to Belgium. Tickets to fly out on this day can be as low as $1,110. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,420. These prices are subject to change though, so be sure to set up a Price Alert for flights to Belgium.

Our most recent data shows that the best time of day to fly to Belgium is in the evening. Flights from Illinois to Belgium during this time can be as low as $1,233. Flights to Belgium are more costly in the afternoon, with an average ticket price of $1,277. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

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

KLM, Delta, and United Airlines are the most popular carriers operating from Illinois to Belgium

United Airlines, Scandinavian Airlines and Icelandair are the top three most popular airlines that fly to Belgium 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 Belgium. Keep in mind that there are 8 different airlines that fly to Belgium on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Belgium 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, 30 flights take off from Illinois and land in Belgium each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.