AirHint found the following cheapest return flights from St. Louis (STL) to Dublin (DUB) in September 2026 (see full year).
Return flights
| 01 Sep - 14 Sep | Lufthansa | ||
| 10 Sep - 17 Sep | Delta | ||
| 06 Sep - 13 Sep | Iberia | ||
| 07 Sep - 13 Sep | Iberia | ||
| 06 Sep - 12 Sep | Delta | ||
| 18 Sep - 30 Sep | United | ||
| 18 Sep - 02 Oct | United |
Also check the deals for one-way flights from St. Louis to Dublin in September.
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