Cheap flights from Ontario to San Francisco from $109

The month of September is, on average, the cheapest month to fly to Oakland, California from Ontario, with most prices found around $179. If you aren’t able to travel to Oakland, California during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $207.

According to our data, Thursday is the cheapest day to fly to Oakland, California from Ontario. The lowest ticket price found for a Thursday departure recently was $278. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Oakland, California for around $379.

In the evening is the cheapest time of day to fly from Ontario to Oakland, California when you can find flight prices for as low as $265. Flying to Oakland, California in the evening is an ideal time because this is during off-peak travel hours. Flights in the morning are often more expensive with an average ticket price of $321.

Fly from Ontario to Oakland for the best Ontario - Oakland flight prices

You are more likely to see cheaper flights to Oakland, California from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Oakland, California for around $268 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Oakland, California from Ontario for as low as $173 on momondo.

Southwest is the most popular carrier operating from Ontario to Oakland

United Airlines, Southwest and Frontier are the top three most popular airlines that fly to Oakland, California from Ontario according to our data. United Airlines is the first choice among our users, with 27% of people opting to fly with this airline when traveling to Oakland, California. Keep in mind that there are 11 different airlines that fly to Oakland, California on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 3 flights per day flying from Ontario to Oakland, California. The most common time of day flights depart is 6:00AM, with 50% of flights taking off at noon.

The number of flights available between Ontario and Oakland, California is 21 per week as of May 2026. The most frequent departure day is Mon, with 19% of weekly flights leaving on this day.