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

Return flights

24 Sep - 28 Sep	KLM
24 Sep - 01 Oct	Delta
25 Sep - 29 Sep	Delta
25 Sep - 28 Sep	Delta
25 Sep - 06 Oct	Delta
25 Sep - 04 Oct	Delta
23 Sep - 29 Sep	Air France
17 Sep - 20 Sep	Air Europa
30 Sep - 07 Oct	Air France
23 Sep - 01 Oct	Air France
18 Sep - 23 Sep	Delta
18 Sep - 27 Sep	Delta
18 Sep - 26 Sep	Air France
18 Sep - 28 Sep	Air France
17 Sep - 23 Sep	KLM
24 Sep - 02 Oct	Iberia
25 Sep - 09 Oct	Delta
26 Sep - 03 Oct	Iberia
24 Sep - 05 Oct	British Airways
28 Sep - 05 Oct	Air France

Also check the deals for one-way flights from Lisbon to New York 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 Lisbon to New York in September from 409€

Return flights