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

Return flights

26 Sep - 29 Sep	Luxair	direct
27 Sep - 29 Sep	Luxair	direct
24 Sep - 29 Sep	ITA Airways
23 Sep - 27 Sep	Luxair	direct
26 Sep - 30 Sep	Luxair	direct
18 Sep - 29 Sep	Luxair	direct
26 Sep - 27 Sep	Luxair	direct
24 Sep - 29 Sep	Luxair	direct
25 Sep - 29 Sep	Luxair	direct
18 Sep - 22 Sep	Luxair	direct
29 Sep - 03 Oct	KLM
29 Sep - 02 Oct	KLM
29 Sep - 03 Oct	Luxair	direct
26 Sep - 03 Oct	Luxair	direct
29 Sep - 08 Oct	Lufthansa
29 Sep - 01 Oct	Air Dolomiti
27 Sep - 01 Oct	SWISS
19 Sep - 20 Oct	SWISS
20 Sep - 03 Oct	Luxair	direct
19 Sep - 20 Oct	Luxair	direct

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 145€

Return flights