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

Return flights

31 Dec - 07 Jan	Scandinavian Airlines
08 Dec - 16 Dec	TAP	direct
30 Dec - 06 Jan	TAP	direct
31 Dec - 07 Jan	TAP	direct
11 Dec - 15 Dec	Delta
06 Dec - 13 Dec	Delta
01 Dec - 08 Dec	TAP	direct
16 Dec - 23 Dec	TAP
11 Dec - 18 Dec	United	direct
11 Dec - 15 Dec	United	direct
13 Dec - 20 Dec	Air Canada
28 Dec - 06 Jan	United
28 Dec - 06 Jan	TAP	direct
01 Dec - 03 Dec	TAP
13 Dec - 20 Dec	TAP	direct
20 Dec - 01 Jan	Icelandair
17 Dec - 11 Jan	Lufthansa
23 Dec - 02 Jan	TAP	direct
21 Dec - 01 Jan	TAP	direct
20 Dec - 01 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 323€

Return flights