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

Return flights

04 Dec - 09 Dec	Air Canada
04 Dec - 08 Dec	Air Canada
03 Dec - 07 Dec	Icelandair
05 Dec - 15 Dec	United	direct
03 Dec - 09 Dec	United
11 Dec - 22 Dec	United
10 Dec - 24 Dec	United	direct
09 Dec - 16 Dec	United	direct
09 Dec - 15 Dec	United
30 Dec - 10 Jan	Air Canada
04 Dec - 11 Dec	TAP	direct
30 Dec - 07 Jan	United
15 Dec - 07 Jan	United
16 Dec - 10 Jan	Air France
30 Dec - 24 Jan	SWISS
24 Dec - 17 Jan	Scandinavian Airlines
30 Dec - 10 Jan	TAP	direct
27 Dec - 07 Jan	British Airways
15 Dec - 07 Jan	TAP	direct
22 Dec - 17 Jan	TAP

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

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 December from 328€

Return flights