Cheapest return flights from London to Porto in May from $229

Best time to book flights for London (LCY) to Porto (OPO) flights at AirHint

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

Return flights

13 May - 19 May SWISS
19 May - 26 May SWISS
15 May - 19 May SWISS
08 May - 13 May SWISS
15 May - 20 May SWISS
15 May - 21 May SWISS
14 May - 20 May SWISS
16 May - 21 May Lufthansa
16 May - 19 May SWISS
01 May - 05 May SWISS
31 May - 03 Jun SWISS
22 May - 08 Jun SWISS
23 May - 02 Jun Lufthansa
27 May - 01 Jun SWISS
30 May - 01 Jun SWISS
24 May - 01 Jun SWISS
29 May - 01 Jun SWISS
25 May - 01 Jun KLM

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

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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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