AirHint found the following cheapest return flights from Chicago (MDW) to Dublin (DUB) in May 2026 (see full year).

Return flights

06 May - 13 May	KLM
05 May - 12 May	KLM
04 May - 11 May	KLM
03 May - 10 May	Delta
12 May - 19 May	Air France
07 May - 14 May	Delta
06 May - 11 May	Delta
02 May - 09 May	Delta
08 May - 15 May	KLM
13 May - 20 May	Porter Airlines (Canada) Ltd
31 May - 07 Jun	Porter Airlines (Canada) Ltd
26 May - 09 Jun	Porter Airlines (Canada) Ltd
18 May - 13 Jun	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Chicago to Dublin in May.

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 May from 403€

Return flights