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

Return flights

07 Sep - 23 Sep	Air Canada
09 Sep - 16 Sep	United
02 Sep - 09 Sep	United
11 Sep - 18 Sep	United
05 Sep - 12 Sep	United
17 Sep - 24 Sep	United
13 Sep - 20 Sep	United
25 Sep - 02 Oct	Frontier Airlines
07 Sep - 14 Sep	United
24 Sep - 30 Sep	Frontier Airlines
19 Sep - 26 Sep	United
29 Sep - 06 Oct	United
17 Sep - 11 Oct	Iberia
27 Sep - 04 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 526€

Return flights