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

Return flights

10 Dec - 18 Dec	Air Canada
05 Dec - 09 Dec	TAP	direct
05 Dec - 12 Dec	TAP
05 Dec - 11 Dec	TAP
04 Dec - 09 Dec	Air Canada
04 Dec - 11 Dec	Air Canada
02 Dec - 10 Dec	Air Canada
01 Dec - 11 Dec	TAP	direct
06 Dec - 14 Dec	United	direct
04 Dec - 21 Dec	United	direct
31 Dec - 24 Jan	United
31 Dec - 12 Jan	United	direct
31 Dec - 14 Jan	United	direct
08 Dec - 14 Jan	United	direct
30 Dec - 24 Jan	United
30 Dec - 28 Jan	United
29 Dec - 24 Jan	United
31 Dec - 09 Jan	TAP	direct
29 Dec - 28 Jan	United
15 Dec - 12 Jan	Air Canada

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 $384

Return flights