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

Return flights

13 Sep - 25 Sep	Iberia For Level
13 Sep - 05 Oct	Icelandair
27 Sep - 05 Oct	Icelandair
24 Sep - 05 Oct	Icelandair
30 Sep - 08 Oct	Air Europa
27 Sep - 02 Oct	Icelandair
25 Sep - 06 Oct	Air Europa
23 Sep - 08 Oct	Air Europa
27 Sep - 19 Oct	Icelandair
15 Sep - 24 Sep	Iberia For Level
22 Sep - 23 Sep	Iberia For Level
17 Sep - 21 Sep	Icelandair
20 Sep - 25 Sep	Icelandair
21 Sep - 24 Sep	Air Europa
28 Sep - 16 Oct	Air Europa
28 Sep - 02 Oct	Iberia For Level
22 Sep - 25 Sep	Iberia For Level
11 Sep - 17 Sep	Air Europa
09 Sep - 24 Sep	Air Europa
11 Sep - 23 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 $378

Return flights