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

Return flights

14 Sep - 22 Sep	Air France
29 Sep - 06 Oct	KLM
30 Sep - 07 Oct	Delta
13 Sep - 21 Sep	Delta
28 Sep - 05 Oct	Air France
17 Sep - 21 Sep	Delta
10 Sep - 17 Sep	KLM
12 Sep - 19 Sep	Delta
16 Sep - 27 Sep	Air France
11 Sep - 18 Sep	Air France
20 Sep - 27 Sep	Air France
21 Sep - 28 Sep	Air France

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

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 September from $559

Return flights