$51 Find Cheap Frontier Flights from Ontario to San Francisco

When to Book Flights with Frontier from Ontario to San Francisco

• How far in advance should I book tickets for a flight with Frontier from Ontario to San Francisco?

  Generally, when trying to get a below average price for your ticket, try to book around 7 days before departure. For the cheapest possible price, our data suggests booking 56 days before departure.

• Is Frontier the cheapest airline to fly with from Ontario to San Francisco?

  With an average price of $83 return, Frontier is not the cheapest airline to fly from Ontario to San Francisco with. Instead, for the lowest price, our data suggests flying with Spirit Airlines, where a return flight costs $74 on average.

• What is the cheapest Frontier flight from Ontario to San Francisco?

  In the last 3 days, the lowest price for a flight with Frontier from Ontario to San Francisco was $52 for a return flight and $28 for a one-way flight.

• Does Frontier fly direct to San Francisco from Ontario?

  No, Frontier does not fly the route directly.

• What’s the cheapest day of the week to fly from Ontario to San Francisco with Frontier?

  On average, the cheapest day of the week to fly from Ontario to San Francisco with Frontier is Friday, when prices are around $19. The most expensive day is generally Saturday, where the average price is around $27.

• What’s the cheapest month to fly from Ontario to San Francisco with Frontier?

  The cheapest month for Frontier flights to San Francisco from Ontario is generally January, where plane tickets cost $44 on average. If possible, try to avoid the most expensive months of April and December, where tickets cost $77 and $79 respectively.