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

Return flights

04 Dec - 11 Dec	Delta
02 Dec - 10 Dec	Delta
07 Dec - 14 Dec	Hawaiian Airlines
01 Dec - 08 Dec	Alaska Airlines
22 Dec - 17 Jan	Hawaiian Airlines
08 Dec - 15 Dec	Alaska Airlines
11 Dec - 18 Dec	Alaska Airlines
15 Dec - 22 Dec	Alaska Airlines
13 Dec - 20 Dec	Alaska Airlines
20 Dec - 27 Dec	Alaska Airlines

Also check the deals for one-way flights from Oakland 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 Oakland to Lisbon in December from 459€

Return flights