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

Return flights

18 Dec - 21 Dec	Southwest Airlines	direct
30 Dec - 02 Jan	Southwest Airlines
19 Dec - 27 Dec	Southwest Airlines	direct
16 Dec - 05 Jan	Alaska Airlines
16 Dec - 06 Jan	Alaska Airlines
18 Dec - 20 Jan	Alaska Airlines
30 Dec - 03 Jan	Alaska Airlines
01 Dec - 30 Dec	Alaska Airlines
17 Dec - 26 Dec	Alaska Airlines

Also check the deals for one-way flights from San Diego to Oakland 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 San Diego to Oakland in December from $193

Return flights