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

Return flights

30 Sep - 06 Oct	Air Canada
23 Sep - 07 Oct	Air Canada
15 Sep - 23 Sep	Air Canada
24 Sep - 29 Sep	Air Canada
22 Sep - 26 Sep	Air Canada
28 Sep - 06 Oct	Air Canada
22 Sep - 30 Sep	Delta
23 Sep - 01 Oct	Lufthansa
11 Sep - 16 Sep	Air Canada
08 Sep - 16 Sep	Air Canada
30 Sep - 07 Oct	Lufthansa
11 Sep - 15 Sep	Air Canada
25 Sep - 28 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
27 Sep - 02 Oct	Spirit Airlines
11 Sep - 19 Sep	Air Transat
23 Sep - 12 Oct	Air Canada
29 Sep - 25 Oct	Virgin Atlantic
28 Sep - 03 Oct	Air Transat
25 Sep - 06 Oct	Porter Airlines (Canada) Ltd

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 $446

Return flights