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

Return flights

25 Sep - 30 Sep	British Airways	direct
24 Sep - 30 Sep	British Airways	direct
25 Sep - 29 Sep	British Airways	direct
26 Sep - 30 Sep	British Airways	direct
23 Sep - 30 Sep	British Airways	direct
24 Sep - 29 Sep	British Airways	direct
26 Sep - 29 Sep	British Airways	direct
30 Sep - 07 Oct	British Airways	direct
24 Sep - 01 Oct	British Airways	direct
29 Sep - 08 Oct	SWISS
30 Sep - 03 Oct	KLM
30 Sep - 04 Oct	Lufthansa
29 Sep - 05 Oct	KLM
26 Sep - 03 Oct	KLM
26 Sep - 05 Oct	KLM
26 Sep - 02 Oct	KLM
29 Sep - 02 Oct	KLM
27 Sep - 30 Sep	Lufthansa
24 Sep - 27 Sep	SWISS
25 Sep - 27 Sep	SWISS

Also check the deals for one-way flights from London to Luxemburg 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 Luxemburg in September from 176€

Return flights