AirHint found the following cheapest return flights from Chicago (ORD) to Brussels (BRU) in August 2025 (see full year).

Return flights

26 Aug - 29 Aug	Scandinavian Airlines
10 Aug - 19 Aug	Aer Lingus
10 Aug - 19 Aug	United	direct
11 Aug - 19 Aug	United
12 Aug - 19 Aug	Air Canada
04 Aug - 19 Aug	United
18 Aug - 25 Aug	Icelandair
06 Aug - 13 Aug	Icelandair
20 Aug - 27 Aug	Icelandair
02 Aug - 20 Aug	TAP
29 Aug - 07 Sep	Scandinavian Airlines
26 Aug - 02 Sep	United	direct
31 Aug - 07 Sep	Icelandair
28 Aug - 04 Sep	United	direct
31 Aug - 07 Sep	United	direct

Also check the deals for one-way flights from Chicago to Brussels in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Chicago to Brussels in August from 415€

Return flights