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

One-Way flights

06 Oct	Porter Airlines (Canada) Ltd
18 Oct	Porter Airlines (Canada) Ltd
05 Oct	Porter Airlines (Canada) Ltd
01 Oct	Porter Airlines (Canada) Ltd
13 Oct	Frontier Airlines
08 Oct	Porter Airlines (Canada) Ltd
14 Oct	Porter Airlines (Canada) Ltd
30 Oct	KLM
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 199€

One-Way flights