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

Return flights

17 Sep - 21 Sep	Ryanair
17 Sep - 22 Sep	Lufthansa
25 Sep - 29 Sep	Ryanair
10 Sep - 30 Sep	SWISS
05 Sep - 09 Sep	Lufthansa
24 Sep - 30 Sep	SWISS
22 Sep - 30 Sep	SWISS
15 Sep - 26 Sep	SWISS
23 Sep - 30 Sep	SWISS
16 Sep - 22 Sep	SWISS
04 Sep - 02 Oct	SWISS
30 Sep - 07 Oct	SWISS
30 Sep - 05 Oct	SWISS
09 Sep - 01 Oct	SWISS
20 Sep - 06 Oct	SWISS
25 Sep - 08 Oct	Delta
29 Sep - 07 Oct	Delta
26 Sep - 01 Oct	Delta
26 Sep - 11 Oct	Delta
26 Sep - 07 Oct	Brussels Airlines

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 404€

Return flights