Cheapest return flights from London to Porto in September from $303

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

26 Sep - 29 Sep Luxair
27 Sep - 29 Sep Luxair
22 Sep - 29 Sep Luxair
20 Sep - 22 Sep Luxair
29 Sep - 03 Oct Luxair
17 Sep - 20 Sep Luxair
12 Sep - 18 Sep Luxair
26 Sep - 30 Sep Luxair
19 Sep - 23 Sep Luxair
24 Sep - 27 Sep British Airways
20 Sep - 23 Sep Luxair
30 Sep - 03 Oct Lufthansa
28 Sep - 02 Oct KLM
27 Sep - 05 Oct KLM
30 Sep - 04 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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