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

Return flights

28 Aug - 31 Aug	Luxair
28 Aug - 07 Sep	Luxair
10 Aug - 12 Aug	KLM
17 Aug - 24 Aug	Iberia
09 Aug - 14 Aug	KLM
10 Aug - 14 Aug	KLM
27 Aug - 01 Sep	Luxair
26 Aug - 01 Sep	Luxair
26 Aug - 02 Sep	Luxair
22 Aug - 01 Sep	KLM
21 Aug - 24 Aug	Luxair
24 Aug - 31 Aug	Luxair
27 Aug - 31 Aug	Luxair
26 Aug - 31 Aug	Luxair
22 Aug - 24 Aug	KLM
03 Aug - 01 Sep	Iberia
29 Aug - 04 Sep	Luxair
29 Aug - 19 Sep	Luxair
29 Aug - 05 Sep	KLM
29 Aug - 06 Sep	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 221€

Return flights