AirHint found the following cheapest return flights from Chicago (ORD) to Brussels (BRU) in May 2026 (see full year).

Return flights

06 May - 18 May	Icelandair
06 May - 20 May	Icelandair
05 May - 15 May	Icelandair
07 May - 18 May	Icelandair
06 May - 13 May	Icelandair
01 May - 08 May	Icelandair
11 May - 17 May	Aer Lingus
07 May - 17 May	Turkish Airlines
20 May - 08 Jun	Spirit Airlines
29 May - 03 Jun	Aer Lingus
20 May - 08 Jun	United	direct

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

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 May from 372€

Return flights