AirHint found the following cheapest return flights from London (LCY) to Porto (OPO) in August 2026 (see full year).

Return flights

19 Aug - 26 Aug	KLM
14 Aug - 21 Aug	Lufthansa
06 Aug - 10 Aug	KLM
05 Aug - 06 Aug	KLM
14 Aug - 19 Aug	KLM
17 Aug - 31 Aug	KLM
04 Aug - 06 Aug	KLM
04 Aug - 11 Aug	KLM
10 Aug - 15 Aug	KLM
10 Aug - 17 Aug	KLM

Also check the deals for one-way flights from London to Porto 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 Porto in August from 299€

Return flights