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

Return flights

25 Sep - 10 Oct	Brussels Airlines	direct
27 Sep - 07 Oct	British Airways	direct
28 Sep - 05 Oct	British Airways	direct
22 Sep - 09 Oct	British Airways	direct
08 Sep - 06 Oct	Brussels Airlines	direct
29 Sep - 04 Oct	Vueling Airlines
30 Sep - 07 Oct	Vueling Airlines
30 Sep - 03 Oct	Vueling Airlines
29 Sep - 01 Oct	Vueling Airlines
28 Sep - 02 Oct	Brussels Airlines

Also check the deals for one-way flights from London to Brussels in September.

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 September from 113€

Return flights