AirHint found the following cheapest return flights from London (LGW) to Brussels (BRU) in December 2025 (see full year).

Return flights

03 Dec - 07 Dec	Vueling Airlines
01 Dec - 04 Dec	Vueling Airlines
16 Dec - 18 Dec	Vueling Airlines
05 Dec - 07 Dec	Vueling Airlines
28 Dec - 08 Jan	Ryanair
09 Dec - 13 Dec	Vueling Airlines
18 Dec - 21 Dec	Vueling Airlines
31 Dec - 03 Jan	SWISS
25 Dec - 29 Dec	Vueling Airlines
28 Dec - 31 Dec	Ryanair
20 Dec - 24 Dec	Vueling Airlines
24 Dec - 28 Dec	Vueling Airlines
30 Dec - 02 Jan	Vueling Airlines
27 Dec - 03 Jan	SWISS
10 Dec - 04 Jan	Air Europa
12 Dec - 04 Jan	Vueling Airlines
29 Dec - 04 Jan	Vueling Airlines
11 Dec - 04 Jan	Air Europa
28 Dec - 04 Jan	airBaltic

Also check the deals for one-way flights from London to Brussels 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 Brussels in December from 120€

Return flights