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

Return flights

19 Aug - 26 Aug	Air Canada
25 Aug - 04 Sep	Lufthansa
25 Aug - 03 Sep	Air Canada
23 Aug - 03 Sep	United
25 Aug - 08 Sep	Air Canada
31 Aug - 09 Sep	Air Canada
17 Aug - 27 Aug	Delta
18 Aug - 27 Aug	Delta
16 Aug - 28 Aug	Delta
18 Aug - 26 Aug	Delta
13 Aug - 27 Aug	Delta
20 Aug - 28 Aug	Delta
24 Aug - 03 Sep	Delta
20 Aug - 25 Aug	Air Canada
13 Aug - 19 Aug	Air Canada
11 Aug - 19 Aug	Air Canada
29 Aug - 12 Sep	Lufthansa
22 Aug - 01 Sep	Air Canada
23 Aug - 13 Sep	Lufthansa
29 Aug - 02 Sep	Lufthansa

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 374€

Return flights