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

Return flights

22 Sep - 29 Sep	Iberia For Level
22 Sep - 01 Oct	Iberia For Level
24 Sep - 01 Oct	Iberia For Level
26 Sep - 30 Sep	Iberia For Level
20 Sep - 26 Sep	Iberia For Level
27 Sep - 01 Oct	Iberia For Level
21 Sep - 29 Sep	Iberia
22 Sep - 26 Sep	Iberia
23 Sep - 30 Sep	Iberia
23 Sep - 29 Sep	Iberia For Level
17 Sep - 23 Sep	Air Canada
17 Sep - 25 Sep	Air Canada
10 Sep - 17 Sep	Lufthansa
25 Sep - 03 Oct	Air Canada
26 Sep - 05 Oct	Air Canada
21 Sep - 02 Oct	TAP	direct
25 Sep - 17 Oct	United
28 Sep - 05 Oct	Aer Lingus
23 Sep - 08 Oct	TAP
26 Sep - 03 Oct	SWISS

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 $384

Return flights