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

Return flights

12 Aug - 21 Aug	TAP
14 Aug - 22 Aug	TAP
15 Aug - 19 Aug	TAP
21 Aug - 28 Aug	TAP
28 Aug - 03 Sep	TAP
24 Aug - 28 Aug	TAP
14 Aug - 17 Aug	TAP
12 Aug - 15 Aug	TAP
12 Aug - 16 Aug	Iberia
29 Aug - 07 Sep	TAP
04 Aug - 14 Aug	TAP
27 Aug - 31 Aug	TAP

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 194€

Return flights