AirHint found the following cheapest return flights from Southampton (SOU) to Dublin (DUB) in September 2026 (see full year).
Return flights
| 10 Sep - 13 Sep | Aer Lingus | direct | |
| 25 Sep - 26 Sep | KLM | ||
| 25 Sep - 28 Sep | KLM |
Also check the deals for one-way flights from Southampton to Dublin in September.
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