Fly nonstop from Chicago to Brussels for $524 round-trip on United.
Seen below, we found seats departing ORD on Thursday, September 22, returning from BRU on Friday, September 30.
Other dates are also available for travel from September through December.
For booking info, see our fare details.
Need a room in Brussels? Here's a look at what's available for the above dates on Hotelwatchdog.