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

Return flights

26 Dec - 01 Jan	Aer Lingus	direct
26 Dec - 31 Dec	Aer Lingus
26 Dec - 29 Dec	Aer Lingus
29 Dec - 01 Jan	Ryanair
29 Dec - 11 Jan	Ryanair
31 Dec - 04 Jan	Ryanair
26 Dec - 26 Dec	Aer Lingus
31 Dec - 02 Jan	Ryanair
31 Dec - 02 Jan	Aer Lingus	direct
29 Dec - 05 Jan	Ryanair
30 Dec - 06 Jan	Ryanair
26 Dec - 29 Dec	Aer Lingus	direct
29 Dec - 01 Jan	Aer Lingus	direct
28 Dec - 04 Jan	Ryanair
26 Dec - 31 Dec	Aer Lingus	direct
27 Dec - 30 Dec	Ryanair
29 Dec - 30 Dec	Aer Lingus	direct
27 Dec - 31 Dec	Vueling Airlines
27 Dec - 30 Dec	Aer Lingus	direct
28 Dec - 28 Dec	Aer Lingus

Also check the deals for one-way flights from Cardiff to Belfast 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 Cardiff to Belfast in December from 127€

Return flights