Cheapest return flights from London to Porto in September from $282

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 September 2025 (see full year).

Return flights

19 Sep - 22 Sep Luxair
26 Sep - 29 Sep Luxair
20 Sep - 25 Sep KLM
11 Sep - 17 Sep Luxair
22 Sep - 01 Oct Lufthansa
22 Sep - 29 Sep Luxair
26 Sep - 30 Sep Luxair
18 Sep - 22 Sep Luxair
12 Sep - 15 Sep Luxair
20 Sep - 24 Sep Luxair
22 Sep - 30 Sep Luxair
28 Sep - 03 Oct KLM

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

Skyscanner

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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