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

Return flights

28 Aug - 31 Aug	KLM
27 Aug - 31 Aug	Delta
25 Aug - 31 Aug	Delta
27 Aug - 04 Sep	Delta
28 Aug - 07 Sep	KLM
27 Aug - 10 Sep	Delta
25 Aug - 02 Sep	Delta
28 Aug - 02 Sep	Delta
28 Aug - 01 Sep	KLM
28 Aug - 04 Sep	KLM
27 Aug - 06 Sep	Delta
27 Aug - 07 Sep	Delta
29 Aug - 05 Sep	Delta
22 Aug - 31 Aug	Delta
06 Aug - 12 Aug	KLM
22 Aug - 26 Aug	Delta
14 Aug - 25 Aug	Air France
26 Aug - 31 Aug	Delta
07 Aug - 11 Aug	Delta
07 Aug - 12 Aug	Delta

Also check the deals for one-way flights from Lisbon to New York 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 Lisbon to New York in August from 439€

Return flights