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

Return flights

24 Sep - 12 Oct	Air France
24 Sep - 11 Oct	Air France
24 Sep - 13 Oct	Air France
25 Sep - 13 Oct	Air France
24 Sep - 29 Sep	KLM
24 Sep - 01 Oct	Air France
25 Sep - 26 Oct	Air France
25 Sep - 16 Oct	Air France
25 Sep - 02 Oct	Air France
24 Sep - 13 Oct	United	direct
26 Sep - 13 Oct	United	direct
25 Sep - 28 Sep	Delta
25 Sep - 30 Sep	Delta
23 Sep - 29 Sep	Delta
23 Sep - 30 Sep	Delta
26 Sep - 28 Sep	United	direct
26 Sep - 29 Sep	United
23 Sep - 27 Sep	Air France
24 Sep - 27 Sep	Delta
22 Sep - 26 Sep	Air France

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 $503

Return flights