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

Return flights

29 Dec - 12 Jan	TAP
16 Dec - 23 Dec	Air Canada
14 Dec - 09 Jan	TAP	direct
05 Dec - 08 Dec	Air Canada
14 Dec - 06 Jan	TAP	direct
06 Dec - 12 Dec	TAP
11 Dec - 15 Dec	Delta
15 Dec - 23 Dec	TAP	direct
04 Dec - 10 Dec	Delta
12 Dec - 15 Dec	Delta
16 Dec - 08 Jan	United
29 Dec - 12 Jan	United	direct
06 Dec - 12 Dec	TAP	direct
05 Dec - 12 Dec	United	direct
05 Dec - 08 Dec	United	direct
13 Dec - 04 Jan	Icelandair
28 Dec - 07 Jan	Lufthansa
24 Dec - 10 Jan	TAP	direct
23 Dec - 06 Jan	TAP	direct
28 Dec - 07 Jan	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 $412

Return flights