Cheap Flights from San Francisco (SFO) to Chicago (CHI)

Frequently Asked Questions

• What are the cheapest flights from San Francisco to Chicago (SFO-CHI)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as US$67 on Cheapest nonstop routes (e.g. SFO to ORD on Sat, Feb 7), while Frontier Airlines offers Cheapest nonstop round-trips from US$125 departing on Fri, Jan 9 and returning on Tue, Jan 13.

• Which airlines offer direct flights from San Francisco to Chicago?

  At the moment, you can catch a nonstop flight from San Francisco to Chicago with the following airlines, including: United Airlines American Airlines Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from San Francisco to Chicago?

  It takes about 4 hours 29 minutes to fly from San Francisco to Chicago.

• When is the best time to book flights from San Francisco to Chicago?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from San Francisco to Chicago is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from San Francisco to Chicago?

  Based on Trip.com data in the past 4 weeks, there is 97 flight per week flying from San Francisco to Chicago. You can check the weekly schedule for popular airlines on this route below: United Airlines: S/M/T/W/T/F/S -- UA2091 (06:16)

• How can I find the best deals on flights from San Francisco to Chicago?

  To find best deals on flights from San Francisco to Chicago, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Feb 7, with one-way flights priced at just US$67.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Chicago travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from San Francisco (SFO) to Chicago (CHI) the cheapest?

  The cheapest months to fly from San Francisco to Chicago is October, when demand for travel is lower.

• Which upcoming date is cheapest to fly from San Francisco to Chicago on?

  After crunching the numbers on our December flight calendar, it's currently cheapest to fly from San Francisco to Chicago on December 13, 2025 with Frontier Airlines, with prices starting at US$60.

• Which airports can I fly to for Chicago from San Francisco?

  You can land at any one of the following hubs in Chicago, with San Francisco International Airport to O'Hare International Airport (SFO-ORD) is by far the most common option on this route: Midway International Airport (MDW) O'Hare International Airport (ORD) Chicago Rockford International Airport (RFD).

• Is there any time difference between San Francisco and Chicago?

  The time difference between Chicago and San Francisco is 2h.

• How do I change or cancel my ticket from San Francisco to Chicago?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.