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

Return flights

22 Sep - 22 Sep	SWISS	direct
26 Sep - 05 Oct	SWISS	direct
30 Sep - 04 Oct	SWISS	direct
29 Sep - 29 Sep	SWISS	direct
30 Sep - 30 Sep	SWISS	direct
25 Sep - 25 Sep	SWISS	direct
23 Sep - 29 Oct	SWISS	direct
29 Sep - 30 Sep	SWISS	direct
23 Sep - 24 Sep	SWISS	direct
23 Sep - 23 Sep	SWISS	direct
23 Sep - 30 Sep	SWISS	direct
26 Sep - 07 Oct	SWISS	direct
26 Sep - 02 Oct	SWISS	direct
24 Sep - 01 Oct	SWISS	direct
25 Sep - 01 Oct	SWISS	direct
25 Sep - 02 Oct	SWISS	direct
29 Sep - 05 Oct	SWISS	direct
30 Sep - 05 Oct	SWISS	direct
25 Sep - 30 Sep	SWISS	direct
24 Sep - 30 Sep	SWISS	direct

Also check the deals for one-way flights from London to Geneva 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 Geneva in September from 113€

Return flights