$99 Find Cheap Frontier Flights from San Francisco to Chicago

When to Book Flights with Frontier from San Francisco to Chicago

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

  Generally, when trying to get a below average price for your ticket, try to book around 15 days before departure. For the cheapest possible price, our data suggests booking 69 days before departure.

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

  Yes, based on our data, Frontier is the cheapest airline to fly the route with an average price of $231 return. The next cheapest options are Spirit Airlines and Alaska Airlines, with return flights costing on average $239 and $307 respectively.

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

  In the last 3 days, the lowest price for a flight with Frontier from San Francisco to Chicago was $205 for a return flight and $98 for a one-way flight.

• Does Frontier fly direct to Chicago from San Francisco?

  No, Frontier does not fly the route directly.

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

  On average, the cheapest day of the week to fly from San Francisco to Chicago with Frontier is Tuesday, when prices are around $47. The most expensive day is generally Saturday, where the average price is around $89.

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

  The cheapest month for Frontier flights to Chicago from San Francisco is generally September, where plane tickets cost $95 on average. If possible, try to avoid the most expensive months of February and June, where tickets cost $159 and $159 respectively.