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

Return flights

05 Sep - 12 Sep	Ryanair	direct
30 Sep - 03 Oct	Ryanair
16 Sep - 18 Sep	Ryanair
26 Sep - 07 Oct	Ryanair
12 Sep - 28 Sep	Ryanair
05 Sep - 21 Sep	Ryanair	direct
26 Sep - 28 Sep	Ryanair
12 Sep - 21 Sep	Ryanair	direct
26 Sep - 05 Oct	Ryanair	direct
26 Sep - 10 Oct	Ryanair	direct
24 Sep - 27 Sep	Ryanair
27 Sep - 28 Sep	Ryanair
26 Sep - 07 Oct	Ryanair	direct
26 Sep - 29 Sep	Ryanair
26 Sep - 17 Oct	Ryanair	direct
26 Sep - 28 Sep	Ryanair	direct
19 Sep - 05 Oct	Ryanair	direct
19 Sep - 10 Oct	Ryanair	direct
19 Sep - 07 Oct	Ryanair	direct
29 Sep - 02 Oct	Ryanair

Also check the deals for one-way flights from Treviso 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 Treviso to Porto in September from $165

Return flights