AirHint found the following cheapest return flights from London (LCY) to Porto (OPO) in July 2025 (see full year).

Return flights

23 Jul - 30 Jul	KLM
23 Jul - 29 Jul	KLM
29 Jul - 01 Aug	KLM
23 Jul - 06 Aug	KLM
23 Jul - 27 Jul	KLM
28 Jul - 01 Aug	KLM
22 Jul - 31 Jul	KLM
28 Jul - 31 Jul	KLM
30 Jul - 01 Aug	KLM
29 Jul - 31 Jul	KLM
23 Jul - 28 Jul	KLM
22 Jul - 05 Aug	KLM
29 Jul - 05 Aug	KLM
30 Jul - 28 Aug	KLM
13 Jul - 27 Jul	KLM
28 Jul - 30 Jul	KLM
23 Jul - 26 Jul	KLM
22 Jul - 26 Aug	KLM
28 Jul - 06 Aug	KLM
23 Jul - 28 Aug	KLM

Also check the deals for one-way flights from London to Porto in July.

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 July from $373

Return flights