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

Return flights

10 Sep - 15 Sep	easyJet
20 Sep - 22 Sep	easyJet
06 Sep - 13 Sep	easyJet
11 Sep - 15 Sep	easyJet
10 Sep - 13 Sep	easyJet
03 Sep - 08 Sep	easyJet
10 Sep - 18 Sep	easyJet
17 Sep - 22 Sep	easyJet
03 Sep - 24 Sep	easyJet
12 Sep - 15 Sep	easyJet
24 Sep - 01 Oct	easyJet
27 Sep - 04 Oct	easyJet
29 Sep - 03 Oct	easyJet

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 $130

Return flights