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

One-Way flights

18 Oct	Porter Airlines (Canada) Ltd
14 Oct	Porter Airlines (Canada) Ltd
19 Oct	Porter Airlines (Canada) Ltd
01 Oct	Porter Airlines (Canada) Ltd
15 Oct	Porter Airlines (Canada) Ltd
20 Oct	Frontier Airlines
27 Oct	Air France
26 Oct	Air France
28 Oct	Delta
31 Oct	Air France

Also check the deals for return 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 one-way flights from Chicago to Dublin in October from 196€

One-Way flights