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

Return flights

29 Dec - 28 Jan	Lufthansa
29 Dec - 28 Jan	Lufthansa	direct
31 Dec - 08 Jan	Icelandair
30 Dec - 28 Jan	TAP	direct
29 Dec - 13 Jan	United	direct
31 Dec - 13 Jan	United	direct
28 Dec - 17 Jan	United	direct
29 Dec - 12 Jan	United	direct
27 Dec - 19 Jan	United	direct
30 Dec - 12 Jan	United
27 Dec - 29 Dec	SWISS
28 Dec - 30 Dec	Lufthansa
27 Dec - 31 Dec	Lufthansa
27 Dec - 29 Dec	TAP	direct
27 Dec - 31 Dec	TAP	direct
29 Dec - 31 Dec	TAP	direct
28 Dec - 30 Dec	TAP	direct

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 562€

Return flights