Cheapest return flights from London to Porto in September 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 September 2025 (see full year).

Return flights

13 Sep - 16 Sep SWISS
09 Sep - 16 Sep SWISS
18 Sep - 22 Sep SWISS
15 Sep - 19 Sep SWISS
08 Sep - 15 Sep SWISS
01 Sep - 17 Sep SWISS
13 Sep - 15 Sep SWISS
12 Sep - 26 Sep SWISS
25 Sep - 28 Sep SWISS
26 Sep - 29 Sep SWISS

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.

Book a cheap hotel in Porto

Cheap car rent in Porto