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

Return flights

13 Aug - 20 Aug	Icelandair
11 Aug - 18 Aug	Icelandair
17 Aug - 26 Aug	Icelandair
18 Aug - 25 Aug	Icelandair
20 Aug - 27 Aug	Icelandair
26 Aug - 02 Sep	Icelandair
24 Aug - 02 Sep	Aer Lingus
22 Aug - 29 Aug	Icelandair
24 Aug - 02 Sep	United	direct
20 Aug - 27 Aug	United	direct
28 Aug - 04 Sep	Icelandair
26 Aug - 02 Sep	United	direct
06 Aug - 13 Aug	Icelandair
07 Aug - 14 Aug	Air Canada
24 Aug - 31 Aug	United	direct
29 Aug - 16 Sep	United	direct
28 Aug - 04 Sep	United	direct
29 Aug - 08 Sep	Air Canada
30 Aug - 06 Sep	United	direct
29 Aug - 08 Sep	Lufthansa	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 497€

Return flights