AirHint found the following cheapest return flights from London (LHR) to Dublin (DUB) in December 2026 (see full year).

Return flights

02 Dec - 08 Dec	British Airways	direct
13 Dec - 15 Dec	British Airways	direct
01 Dec - 08 Dec	British Airways	direct
12 Dec - 13 Dec	British Airways	direct
04 Dec - 06 Dec	British Airways	direct
11 Dec - 13 Dec	British Airways	direct
18 Dec - 05 Jan	Aer Lingus	direct
13 Dec - 20 Dec	KLM
12 Dec - 19 Dec	Air France
16 Dec - 19 Dec	Air France
12 Dec - 31 Dec	Air France
15 Dec - 06 Jan	KLM
18 Dec - 07 Jan	KLM
30 Dec - 08 Jan	KLM
30 Dec - 03 Jan	KLM
30 Dec - 02 Jan	KLM
26 Dec - 02 Jan	KLM
29 Dec - 03 Jan	KLM
31 Dec - 03 Jan	KLM
29 Dec - 04 Jan	KLM

Also check the deals for one-way flights from London 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 London to Dublin in December from 85€

Return flights