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

Return flights

03 Dec - 09 Dec	Air Canada
05 Dec - 08 Dec	SWISS
08 Dec - 22 Dec	United	direct
10 Dec - 15 Dec	United	direct
05 Dec - 08 Dec	United	direct
11 Dec - 23 Dec	Air Canada
03 Dec - 09 Dec	TAP	direct
03 Dec - 08 Dec	TAP	direct
05 Dec - 12 Dec	TAP	direct
03 Dec - 27 Dec	SWISS
30 Dec - 24 Jan	SWISS
31 Dec - 07 Jan	United
31 Dec - 08 Jan	United
25 Dec - 17 Jan	British Airways
25 Dec - 07 Jan	British Airways
24 Dec - 07 Jan	British Airways
24 Dec - 13 Jan	SWISS
27 Dec - 10 Jan	British Airways
31 Dec - 07 Jan	TAP	direct
31 Dec - 04 Jan	Icelandair

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 $400

Return flights