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
05 Dec - 09 Dec	TAP	direct
04 Dec - 11 Dec	Air Canada
03 Dec - 07 Dec	SWISS
06 Dec - 14 Dec	United	direct
04 Dec - 21 Dec	United	direct
10 Dec - 17 Dec	United	direct
08 Dec - 15 Dec	United	direct
10 Dec - 14 Dec	United	direct
10 Dec - 15 Dec	United	direct
08 Dec - 14 Jan	United	direct
31 Dec - 24 Jan	United
30 Dec - 24 Jan	United
11 Dec - 08 Jan	Air Canada
31 Dec - 08 Jan	Air Canada
31 Dec - 10 Jan	TAP	direct
31 Dec - 08 Jan	TAP	direct
30 Dec - 07 Jan	Air Canada
30 Dec - 08 Jan	British Airways
29 Dec - 12 Jan	United

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 $390

Return flights