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

Return flights

27 Oct - 05 Nov	Air France
29 Oct - 05 Nov	Delta
26 Oct - 04 Nov	Delta
28 Oct - 04 Nov	Delta
30 Oct - 06 Nov	KLM
27 Oct - 03 Nov	Air France
15 Oct - 08 Nov	KLM
21 Oct - 28 Oct	KLM
07 Oct - 21 Oct	KLM
14 Oct - 21 Oct	KLM
15 Oct - 22 Oct	KLM
06 Oct - 08 Oct	Frontier Airlines
22 Oct - 29 Oct	Air France
08 Oct - 15 Oct	Air France
30 Oct - 04 Nov	Delta
24 Oct - 31 Oct	KLM
26 Oct - 02 Nov	KLM
10 Oct - 17 Oct	KLM
09 Oct - 16 Oct	KLM
31 Oct - 03 Nov	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 505€

Return flights