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

Return flights

02 Dec - 09 Dec	TAP	direct
03 Dec - 10 Dec	TAP
02 Dec - 16 Dec	TAP	direct
02 Dec - 08 Dec	Virgin Atlantic
03 Dec - 10 Dec	United	direct
01 Dec - 31 Dec	United
15 Dec - 22 Dec	TAP	direct
13 Dec - 20 Dec	TAP	direct
05 Dec - 19 Dec	SWISS
23 Dec - 31 Dec	TAP
24 Dec - 06 Jan	TAP
25 Dec - 01 Jan	TAP	direct
23 Dec - 06 Jan	TAP
20 Dec - 10 Jan	TAP	direct
22 Dec - 01 Jan	TAP	direct
29 Dec - 03 Jan	TAP	direct
26 Dec - 03 Jan	TAP	direct
28 Dec - 04 Jan	TAP	direct
18 Dec - 03 Jan	Lufthansa

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 342€

Return flights