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

Return flights

25 Sep - 16 Oct	Air Europa
30 Sep - 09 Oct	Air Europa
25 Sep - 10 Oct	Air Europa
30 Sep - 08 Oct	Air Europa
25 Sep - 08 Oct	Air Europa
25 Sep - 06 Oct	Air Europa
30 Sep - 06 Oct	Air Europa
13 Sep - 25 Sep	Icelandair
13 Sep - 21 Sep	Icelandair
13 Sep - 18 Sep	Icelandair
24 Sep - 02 Oct	Icelandair
27 Sep - 05 Oct	Icelandair
27 Sep - 02 Oct	Icelandair
10 Sep - 14 Sep	Icelandair
10 Sep - 21 Sep	Icelandair
20 Sep - 28 Sep	Icelandair
10 Sep - 25 Sep	Icelandair
24 Sep - 28 Sep	Icelandair
20 Sep - 25 Sep	Icelandair
16 Sep - 25 Sep	Air Europa

Also check the deals for one-way flights from New York to Lisbon 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 Lisbon in September from $382

Return flights