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

Return flights

02 Aug - 20 Aug	TAP
26 Aug - 02 Sep	Turkish Airlines
19 Aug - 26 Aug	Icelandair
25 Aug - 31 Aug	TAP
10 Aug - 31 Aug	TAP
04 Aug - 19 Aug	TAP
10 Aug - 19 Aug	Icelandair
15 Aug - 22 Aug	Icelandair
17 Aug - 24 Aug	Icelandair
10 Aug - 19 Aug	United	direct
12 Aug - 19 Aug	United
27 Aug - 03 Sep	Icelandair
26 Aug - 02 Sep	United	direct
31 Aug - 07 Sep	Icelandair
25 Aug - 01 Sep	United	direct
29 Aug - 05 Sep	Spirit Airlines
29 Aug - 16 Sep	United	direct
29 Aug - 05 Sep	United	direct
31 Aug - 07 Sep	United	direct
29 Aug - 07 Sep	Scandinavian Airlines

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 $578

Return flights