AirHint found the following cheapest return flights from Southampton (SOU) to Dublin (DUB) in December 2025 (see full year).

Return flights

12 Dec - 15 Dec	easyJet
12 Dec - 14 Dec	easyJet
09 Dec - 12 Dec	Aer Lingus	direct
09 Dec - 12 Dec	easyJet
02 Dec - 10 Dec	easyJet
01 Dec - 02 Dec	Aer Lingus	direct
08 Dec - 12 Dec	Aer Lingus	direct
10 Dec - 12 Dec	Aer Lingus	direct
15 Dec - 17 Dec	Aer Lingus	direct
02 Dec - 10 Dec	Aer Lingus	direct
30 Dec - 01 Jan	Aer Lingus
30 Dec - 01 Jan	Aer Lingus	direct
23 Dec - 01 Jan	KLM
29 Dec - 01 Jan	Aer Lingus
29 Dec - 01 Jan	Aer Lingus	direct
31 Dec - 04 Jan	Aer Lingus	direct
29 Dec - 03 Jan	Aer Lingus	direct
23 Dec - 01 Jan	Aer Lingus	direct
27 Dec - 01 Jan	KLM
26 Dec - 04 Jan	Aer Lingus	direct

Also check the deals for one-way flights from Southampton to Dublin in December.

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 Southampton to Dublin in December from 120€

Return flights