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

Return flights

02 Sep - 09 Sep	SWISS
02 Sep - 16 Sep	SWISS
02 Sep - 17 Sep	SWISS
29 Sep - 01 Oct	SWISS
02 Sep - 01 Oct	Lufthansa
04 Sep - 16 Sep	SWISS
30 Sep - 01 Oct	SWISS
09 Sep - 24 Sep	SWISS
16 Sep - 24 Sep	SWISS
03 Sep - 24 Sep	Lufthansa
16 Sep - 17 Sep	Lufthansa
17 Sep - 24 Sep	SWISS
01 Sep - 01 Oct	SWISS
04 Sep - 17 Sep	SWISS
29 Sep - 29 Oct	SWISS
23 Sep - 01 Oct	Lufthansa
30 Sep - 04 Oct	SWISS
22 Sep - 02 Oct	KLM
23 Sep - 16 Oct	KLM
29 Sep - 02 Oct	SWISS

Also check the deals for one-way flights from London to Lisbon 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 Lisbon in September from 209€

Return flights