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

Return flights

01 Dec - 08 Dec	easyJet
31 Dec - 05 Jan	easyJet
22 Dec - 27 Dec	easyJet
29 Dec - 03 Jan	Aer Lingus
10 Dec - 14 Dec	easyJet
11 Dec - 15 Dec	easyJet
11 Dec - 14 Dec	easyJet
29 Dec - 05 Jan	Aer Lingus
01 Dec - 14 Dec	easyJet
14 Dec - 04 Jan	Aer Lingus
04 Dec - 08 Dec	easyJet
30 Dec - 03 Jan	Aer Lingus
05 Dec - 08 Dec	easyJet
05 Dec - 07 Dec	Aer Lingus
30 Dec - 24 Jan	Aer Lingus
03 Dec - 05 Dec	easyJet

Also check the deals for one-way flights from Belfast 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 Belfast to Dublin in December from $148

Return flights