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

Return flights

20 Aug - 25 Aug	Air Canada
15 Aug - 08 Sep	Norse Atlantic Airways
23 Aug - 04 Sep	Icelandair
31 Aug - 24 Sep	Norse Atlantic Airways
20 Aug - 03 Sep	Air Canada
13 Aug - 19 Aug	Air Canada
26 Aug - 03 Sep	Air Canada
23 Aug - 28 Aug	Icelandair
27 Aug - 04 Sep	Icelandair
18 Aug - 25 Aug	Air Canada
06 Aug - 20 Aug	Air Canada
30 Aug - 30 Sep	Norse Atlantic Airways
29 Aug - 17 Sep	Norse Atlantic Airways
11 Aug - 20 Aug	Air Canada
19 Aug - 27 Aug	Virgin Atlantic
20 Aug - 27 Aug	Air Canada
20 Aug - 24 Aug	Icelandair
19 Aug - 26 Aug	SWISS
31 Aug - 07 Sep	Icelandair
25 Aug - 02 Sep	SWISS

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 $488

Return flights