AirHint found the following cheapest return flights from Chicago (MDW) to Dublin (DUB) in October 2025 (see full year).

Return flights

26 Oct - 04 Nov	Air France
30 Oct - 06 Nov	Delta
22 Oct - 15 Nov	KLM
23 Oct - 15 Nov	KLM
24 Oct - 15 Nov	KLM
18 Oct - 08 Nov	Air France
24 Oct - 30 Oct	Delta
17 Oct - 08 Nov	KLM
21 Oct - 31 Oct	Delta
20 Oct - 29 Oct	Delta
22 Oct - 29 Oct	Delta
21 Oct - 30 Oct	Delta
20 Oct - 27 Oct	KLM
22 Oct - 27 Oct	Frontier Airlines
30 Oct - 22 Nov	KLM
31 Oct - 09 Nov	Delta
24 Oct - 27 Oct	Porter Airlines (Canada) Ltd
31 Oct - 02 Nov	Delta
17 Oct - 24 Oct	Delta
23 Oct - 26 Oct	Delta

Also check the deals for one-way flights from Chicago to Dublin 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 Dublin in October from 365€

Return flights