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

Return flights

17 Sep - 25 Sep	TAP	direct
18 Sep - 25 Sep	TAP	direct
18 Sep - 28 Sep	TAP	direct
08 Sep - 15 Sep	TAP	direct
08 Sep - 14 Sep	TAP	direct
18 Sep - 23 Sep	TAP	direct
18 Sep - 29 Sep	TAP	direct
17 Sep - 29 Sep	TAP	direct
09 Sep - 14 Sep	TAP	direct
25 Sep - 30 Sep	TAP	direct
20 Sep - 01 Oct	TAP	direct
08 Sep - 21 Oct	SWISS
10 Sep - 13 Oct	Lufthansa
30 Sep - 05 Oct	Delta
30 Sep - 06 Oct	Delta
23 Sep - 05 Oct	SWISS
27 Sep - 12 Oct	SWISS
22 Sep - 01 Oct	SWISS
21 Sep - 01 Oct	Vueling Airlines
26 Sep - 03 Oct	SWISS

Also check the deals for one-way flights from Lisbon to Newark in September.

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 Newark in September from $472

Return flights