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

Return flights

28 Sep - 16 Oct	Ryanair	direct
28 Sep - 15 Oct	Ryanair	direct
27 Sep - 16 Oct	Ryanair	direct
27 Sep - 15 Oct	Ryanair	direct
23 Sep - 03 Oct	easyJet	direct
23 Sep - 07 Oct	easyJet	direct
28 Sep - 08 Oct	Ryanair	direct
28 Sep - 17 Oct	Ryanair	direct
28 Sep - 09 Oct	Ryanair	direct
28 Sep - 06 Oct	Ryanair
09 Sep - 21 Sep	Wizz Air UK
01 Sep - 17 Sep	Ryanair	direct
01 Sep - 15 Sep	Ryanair
01 Sep - 16 Sep	Ryanair
02 Sep - 12 Sep	easyJet	direct
22 Sep - 24 Sep	Ryanair
28 Sep - 30 Sep	Ryanair	direct
01 Sep - 11 Sep	Ryanair
02 Sep - 16 Sep	easyJet	direct
27 Sep - 30 Sep	Ryanair	direct

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

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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Cheapest return flights from London to Porto in September from $105

Return flights