Cheapest return flights from London to Porto in September from $306

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
29 Sep - 03 Oct Luxair
27 Sep - 29 Sep Luxair
11 Sep - 17 Sep Luxair
17 Sep - 20 Sep Luxair
21 Sep - 25 Sep KLM
19 Sep - 22 Sep Luxair
22 Sep - 24 Sep Luxair
22 Sep - 26 Sep Luxair
26 Sep - 30 Sep Luxair
08 Sep - 12 Sep Lufthansa
26 Sep - 03 Oct Luxair
21 Sep - 01 Oct KLM
21 Sep - 02 Oct KLM
25 Sep - 02 Oct Lufthansa
26 Sep - 12 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.

Book a cheap hotel in Porto

Cheap car rent in Porto