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

Return flights

26 Aug - 15 Sep	Vueling Airlines
26 Aug - 11 Sep	Vueling Airlines
26 Aug - 09 Sep	Vueling Airlines
28 Aug - 17 Sep	TAP	direct
28 Aug - 11 Sep	TAP	direct
26 Aug - 16 Sep	Vueling Airlines
27 Aug - 15 Sep	Vueling Airlines
28 Aug - 09 Sep	TAP	direct
30 Aug - 09 Sep	TAP	direct
28 Aug - 16 Sep	TAP	direct
16 Aug - 20 Aug	SWISS
13 Aug - 19 Aug	KLM
14 Aug - 19 Aug	KLM
26 Aug - 27 Aug	Vueling Airlines
07 Aug - 08 Aug	KLM
03 Aug - 05 Aug	Iberia
13 Aug - 18 Aug	SWISS
12 Aug - 26 Aug	KLM
14 Aug - 26 Aug	KLM
26 Aug - 28 Aug	Vueling Airlines

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 $176

Return flights