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

Return flights

21 Sep - 01 Oct	Air Canada
28 Sep - 06 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
30 Sep - 06 Oct	Air Canada
17 Sep - 22 Sep	Air Canada
08 Sep - 13 Sep	Air Canada
03 Sep - 13 Sep	Air Canada
24 Sep - 01 Oct	Air Canada
22 Sep - 25 Sep	Air Canada
07 Sep - 17 Sep	Air Canada
30 Sep - 08 Oct	Air Canada
24 Sep - 29 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
20 Sep - 24 Sep	Air Canada
19 Sep - 26 Sep	Air Canada
05 Sep - 08 Sep	Air Canada
23 Sep - 06 Oct	Air Canada
29 Sep - 05 Oct	Air Canada
27 Sep - 22 Oct	United
30 Sep - 16 Oct	Virgin Atlantic

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 $389

Return flights