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

Return flights

12 Dec - 14 Dec	Ryanair	direct
07 Dec - 12 Dec	Ryanair	direct
07 Dec - 14 Dec	Ryanair	direct
12 Dec - 16 Dec	Ryanair
12 Dec - 17 Dec	Ryanair
16 Dec - 17 Dec	Vueling Airlines
12 Dec - 15 Dec	Ryanair
13 Dec - 15 Dec	Vueling Airlines
11 Dec - 14 Dec	Vueling Airlines
05 Dec - 07 Dec	Vueling Airlines
26 Dec - 01 Jan	Ryanair
19 Dec - 04 Jan	Ryanair
26 Dec - 01 Jan	Ryanair	direct
19 Dec - 04 Jan	Ryanair	direct
28 Dec - 01 Jan	Ryanair
28 Dec - 01 Jan	Ryanair	direct

Also check the deals for one-way flights from Santander 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 Santander to Dublin in December from 79€

Return flights