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

Return flights

23 Sep - 14 Oct	Eurowings
23 Sep - 22 Oct	SWISS
22 Sep - 13 Oct	Vueling Airlines
22 Sep - 08 Oct	Vueling Airlines
23 Sep - 19 Oct	SWISS
22 Sep - 22 Oct	Vueling Airlines
22 Sep - 21 Oct	Vueling Airlines
22 Sep - 25 Sep	Ethiopian Airlines
22 Sep - 20 Oct	Vueling Airlines
24 Sep - 21 Oct	Vueling Airlines
23 Sep - 07 Oct	SWISS
27 Sep - 30 Sep	KLM
22 Sep - 28 Sep	Ethiopian Airlines
24 Sep - 29 Sep	RwandAir
23 Sep - 27 Sep	KLM

Also check the deals for one-way flights from London to Mombasa 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 Mombasa in September from 578€

Return flights