AirHint found the following cheapest one-way flights from Southampton (SOU) to Dublin (DUB) in September 2025 (see full year).

One-Way flights

02 Sep	Aer Lingus	direct
01 Sep	Aer Lingus	direct
05 Sep	Aer Lingus	direct
03 Sep	Aer Lingus	direct
04 Sep	Aer Lingus	direct
06 Sep	easyJet
13 Sep	easyJet
28 Sep	Aer Lingus	direct
27 Sep	Aer Lingus	direct
13 Sep	Aer Lingus	direct

Also check the deals for return flights from Southampton 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 one-way flights from Southampton to Dublin in September from $60

One-Way flights