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

Return flights

22 Sep - 30 Sep	Air Canada
22 Sep - 01 Oct	Air Canada
21 Sep - 27 Sep	Air Canada
29 Sep - 08 Oct	Aer Lingus
06 Sep - 14 Sep	Icelandair
17 Sep - 23 Sep	Air Canada
18 Sep - 22 Sep	Air Canada
09 Sep - 20 Sep	Air Canada
22 Sep - 30 Sep	TAP	direct
30 Sep - 08 Oct	TAP	direct
21 Sep - 26 Sep	Air Canada
15 Sep - 22 Sep	Air Canada
30 Sep - 16 Oct	TAP	direct
22 Sep - 01 Oct	TAP	direct
03 Sep - 08 Sep	Air Canada
26 Sep - 02 Oct	Air Canada
29 Sep - 06 Oct	United
21 Sep - 02 Oct	TAP	direct
24 Sep - 01 Oct	TAP	direct
30 Sep - 07 Oct	TAP	direct

Also check the deals for one-way flights from Newark to Lisbon 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 Newark to Lisbon in September from $379

Return flights