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

Return flights

28 Aug - 17 Sep	SWISS
28 Aug - 10 Sep	SWISS
28 Aug - 09 Sep	SWISS
26 Aug - 09 Sep	Lufthansa
27 Aug - 09 Sep	SWISS
21 Aug - 10 Sep	Lufthansa
27 Aug - 02 Sep	KLM
27 Aug - 03 Sep	KLM
21 Aug - 03 Sep	KLM
21 Aug - 09 Sep	Lufthansa
20 Aug - 21 Aug	Lufthansa
19 Aug - 28 Aug	Lufthansa
19 Aug - 20 Aug	Lufthansa
16 Aug - 20 Aug	SWISS
20 Aug - 28 Aug	Lufthansa
26 Aug - 27 Aug	Lufthansa
18 Aug - 28 Aug	Lufthansa
27 Aug - 28 Aug	Lufthansa
20 Aug - 27 Aug	SWISS
22 Aug - 28 Aug	Lufthansa

Also check the deals for one-way flights from London to Lisbon in August.

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 August from 214€

Return flights