AirHint found the following cheapest return flights from Chicago (ORD) to Copenhagen (CPH) in October 2025 (see full year).

Return flights

01 Oct - 15 Oct	Icelandair
10 Oct - 17 Oct	Icelandair
15 Oct - 22 Oct	Icelandair
30 Oct - 06 Nov	Icelandair
29 Oct - 12 Nov	Icelandair
05 Oct - 12 Oct	Icelandair
02 Oct - 16 Oct	Icelandair
25 Oct - 01 Nov	Icelandair
20 Oct - 27 Oct	Scandinavian Airlines	direct
30 Oct - 06 Nov	Scandinavian Airlines	direct
02 Oct - 16 Oct	Scandinavian Airlines	direct
29 Oct - 12 Nov	Scandinavian Airlines	direct
05 Oct - 12 Oct	Scandinavian Airlines	direct
25 Oct - 01 Nov	Scandinavian Airlines	direct

Also check the deals for one-way flights from Chicago to Copenhagen in October.

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 Copenhagen in October from 378€

Return flights