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

Return flights

04 Aug - 11 Aug	KLM
18 Aug - 26 Aug	KLM
12 Aug - 19 Aug	KLM
17 Aug - 28 Aug	Air Dolomiti
24 Aug - 28 Aug	Air Dolomiti
09 Aug - 12 Aug	KLM
25 Aug - 30 Aug	KLM
22 Aug - 02 Sep	KLM
28 Aug - 31 Aug	Luxair
28 Aug - 30 Aug	KLM
14 Aug - 15 Aug	KLM
30 Aug - 13 Sep	SWISS

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 309€

Return flights