AirHint found the following cheapest return flights from St. Louis (STL) to Dublin (DUB) in September 2025 (see full year).

Return flights

04 Sep - 12 Sep	Air Canada
17 Sep - 24 Sep	United
08 Sep - 15 Sep	KLM
02 Sep - 09 Sep	United
05 Sep - 12 Sep	United
29 Sep - 06 Oct	United
20 Sep - 27 Sep	United
11 Sep - 18 Sep	Aer Lingus
14 Sep - 21 Sep	Aer Lingus
26 Sep - 03 Oct	Aer Lingus
23 Sep - 30 Sep	United
24 Sep - 01 Oct	United

Also check the deals for one-way flights from St. Louis 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 St. Louis to Dublin in September from $520

Return flights