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

Return flights

26 Sep - 27 Sep	Luxair	direct
12 Sep - 13 Sep	Luxair	direct
26 Sep - 29 Sep	Luxair	direct
13 Sep - 14 Sep	Luxair	direct
12 Sep - 14 Sep	Luxair	direct
16 Sep - 18 Sep	Luxair	direct
11 Sep - 13 Sep	Luxair	direct
24 Sep - 27 Sep	Luxair	direct
12 Sep - 18 Sep	Luxair	direct
19 Sep - 29 Sep	Luxair	direct
26 Sep - 05 Oct	Luxair	direct
26 Sep - 27 Oct	Luxair	direct
26 Sep - 01 Oct	Luxair	direct
27 Sep - 27 Oct	Luxair	direct
26 Sep - 26 Oct	Luxair	direct
27 Sep - 26 Oct	Luxair	direct
30 Sep - 02 Oct	Luxair
30 Sep - 02 Oct	Luxair	direct
18 Sep - 02 Oct	KLM
28 Sep - 01 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 108€

Return flights