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

Return flights

20 Aug - 28 Aug	Icelandair
23 Aug - 28 Aug	Icelandair
06 Aug - 10 Aug	Icelandair
11 Aug - 11 Sep	Air Canada
11 Aug - 12 Sep	Air Canada
20 Aug - 10 Sep	Air Canada
14 Aug - 03 Sep	Air Canada
19 Aug - 03 Sep	Air Canada
20 Aug - 05 Sep	Air Canada
24 Aug - 08 Sep	Air Canada
11 Aug - 05 Sep	Lufthansa
06 Aug - 14 Aug	Icelandair
19 Aug - 26 Aug	Air Canada
19 Aug - 27 Aug	Air Canada
18 Aug - 02 Sep	Air Canada
05 Aug - 22 Sep	United
18 Aug - 27 Aug	Air Canada
20 Aug - 24 Aug	Icelandair
14 Aug - 28 Aug	Air Canada
21 Aug - 28 Aug	Air Canada

Also check the deals for one-way flights from New York to Lisbon in August.

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 August from $399

Return flights