Cheap flights from Illinois to San Francisco from $128

If you aren’t able to travel to San Francisco during the month of October, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $394.

The cheapest day to depart from Illinois to San Francisco is on a Thursday when prices can be found for as low as $422. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $679.

Our data shows that the cheapest Illinois to San Francisco flights are usually those with departure times at noon. Our users have found flights to San Francisco at noon for as low as $442. Flights in the afternoon are often more expensive with an average ticket price of $661.

Fly from Chicago O'Hare Intl to San Francisco for the best Illinois - San Francisco flight prices

You are more likely to see cheaper flights to San Francisco from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $423 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Illinois for as low as $337 on momondo.

There are 4 cabin classes available to choose from on Illinois to San Francisco flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Delta, Southwest, and JetBlue are the most popular carriers operating from Illinois to San Francisco

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to San Francisco from Illinois according to our data. United Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 7 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

75 flights are operational daily from Illinois to San Francisco as of September 2026. The most popular departure time for this route is 9:00PM, with 40% of flights per day taking off in the afternoon.

As of September 2026, there are 526 flights per week flying from Illinois to San Francisco. The most common day of the week flights depart is Tue, with 19% of flights taking off on this day.