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

Return flights

16 Sep - 23 Sep	Iberia
21 Sep - 28 Sep	Air Europa
19 Sep - 28 Sep	Air Europa
20 Sep - 28 Sep	Air Europa
16 Sep - 23 Sep	TAP	direct
02 Sep - 10 Sep	Vueling Airlines
08 Sep - 17 Sep	TAP	direct
10 Sep - 17 Sep	TAP	direct
07 Sep - 17 Sep	TAP	direct
04 Sep - 02 Oct	FrenchBee
08 Sep - 25 Sep	TAP
25 Sep - 02 Oct	TAP
18 Sep - 02 Oct	FrenchBee
01 Sep - 01 Oct	Air Caraibes
04 Sep - 02 Oct	United	direct

Also check the deals for one-way flights from New York 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 New York to Porto in September from $405

Return flights