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

Return flights

06 Aug - 10 Aug	Icelandair
02 Aug - 10 Aug	Icelandair
05 Aug - 08 Sep	Air Canada
13 Aug - 20 Sep	Air Canada
10 Aug - 05 Sep	Air Canada
10 Aug - 10 Sep	Air Canada
20 Aug - 17 Sep	Air Canada
20 Aug - 28 Aug	Icelandair
19 Aug - 02 Sep	Air Canada
13 Aug - 19 Sep	United
24 Aug - 13 Sep	Air Canada
14 Aug - 03 Sep	Air Canada
26 Aug - 09 Sep	TAP	direct
02 Aug - 14 Aug	Icelandair
18 Aug - 26 Aug	Air Canada
16 Aug - 28 Aug	Air Canada
04 Aug - 11 Aug	Air Canada
14 Aug - 21 Aug	Air Canada
15 Aug - 21 Aug	Air Canada
17 Aug - 26 Aug	SWISS

Also check the deals for one-way flights from Newark 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 Newark to Lisbon in August from $405

Return flights