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

One-Way flights

16 Dec	Southwest Airlines	direct
17 Dec	Southwest Airlines	direct
15 Dec	Southwest Airlines	direct
18 Dec	Southwest Airlines	direct
13 Dec	Southwest Airlines	direct
09 Dec	Delta
14 Dec	Southwest Airlines	direct
10 Dec	Alaska Airlines
06 Dec	Alaska Airlines
08 Dec	Alaska Airlines

Also check the deals for return flights from Oakland to San Diego 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 one-way flights from Oakland to San Diego in December from $48

One-Way flights