AirHint found the following cheapest one-way flights from London (LHR) to Dublin (DUB) in December 2025 (see full year).

One-Way flights

02 Dec	British Airways	direct
15 Dec	British Airways	direct
23 Dec	British Airways	direct
11 Dec	British Airways	direct
30 Dec	British Airways	direct
01 Dec	British Airways	direct
24 Dec	British Airways	direct
07 Dec	British Airways	direct
16 Dec	British Airways	direct
04 Dec	British Airways	direct

Also check the deals for return 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 one-way flights from London to Dublin in December from $75

One-Way flights