AirHint found the following cheapest return flights from Lille (LIL) to Porto (OPO) in September 2025 (see full year).

Return flights

29 Sep - 13 Oct	Ryanair	direct
29 Sep - 20 Oct	Ryanair	direct
26 Sep - 13 Oct	Ryanair	direct
29 Sep - 17 Oct	Ryanair	direct
26 Sep - 02 Oct	Ryanair
29 Sep - 06 Oct	Ryanair	direct
29 Sep - 03 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
26 Sep - 17 Oct	Ryanair	direct
26 Sep - 10 Oct	Ryanair	direct
26 Sep - 30 Sep	Ryanair
22 Sep - 25 Sep	Volotea
26 Sep - 29 Sep	Ryanair	direct
26 Sep - 28 Sep	Ryanair
22 Sep - 24 Sep	Volotea
23 Sep - 25 Sep	Ryanair
25 Sep - 29 Sep	Volotea
22 Sep - 23 Sep	Volotea
24 Sep - 25 Sep	Volotea
25 Sep - 30 Sep	Volotea

Also check the deals for one-way flights from Lille 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 Lille to Porto in September from 98€

Return flights