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

Return flights

30 Dec - 20 Jan	United	direct
30 Dec - 28 Jan	United	direct
31 Dec - 12 Jan	United
06 Dec - 09 Dec	TAP
08 Dec - 14 Jan	Lufthansa
10 Dec - 17 Dec	Air Canada
09 Dec - 16 Dec	Lufthansa	direct
08 Dec - 14 Jan	Lufthansa	direct
10 Dec - 16 Dec	Lufthansa	direct
08 Dec - 17 Dec	United	direct
09 Dec - 19 Dec	Brussels Airlines	direct
31 Dec - 08 Jan	British Airways
10 Dec - 24 Dec	Air Canada
07 Dec - 14 Dec	Lufthansa
10 Dec - 15 Dec	KLM
11 Dec - 16 Dec	Lufthansa	direct
29 Dec - 13 Jan	United	direct
29 Dec - 28 Jan	United	direct
31 Dec - 11 Jan	United	direct
28 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 351€

Return flights