Cheapest return flights from London to Porto in September from $325

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

Return flights

18 Sep - 23 Sep Luxair
21 Sep - 25 Sep Luxair
18 Sep - 21 Sep Luxair
12 Sep - 04 Oct SWISS
11 Sep - 14 Sep Luxair
05 Sep - 09 Sep SWISS
12 Sep - 20 Sep SWISS
04 Sep - 08 Sep KLM
21 Sep - 27 Sep KLM
01 Sep - 05 Sep KLM
27 Sep - 04 Oct KLM
24 Sep - 27 Sep KLM

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

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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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