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

Return flights

24 Sep - 01 Oct	Ryanair
26 Sep - 10 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
05 Sep - 17 Sep	Ryanair
17 Sep - 24 Sep	Ryanair
30 Sep - 07 Oct	Ryanair	direct
19 Sep - 24 Sep	Ryanair
30 Sep - 04 Oct	Ryanair	direct
23 Sep - 26 Sep	Ryanair
10 Sep - 19 Sep	Ryanair
05 Sep - 09 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
19 Sep - 26 Sep	Ryanair
03 Sep - 03 Oct	Ryanair
24 Sep - 08 Oct	Ryanair
30 Sep - 14 Oct	Ryanair	direct
23 Sep - 07 Oct	Ryanair
03 Sep - 10 Sep	Ryanair
10 Sep - 16 Sep	Ryanair
05 Sep - 12 Sep	Ryanair

Also check the deals for one-way flights from Warsaw 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 Warsaw to Porto in September from 142€

Return flights