Cheap Flights from San Diego to Chicago from US$84

Frequently Asked Questions

• What are the cheapest flights from San Diego to Chicago (SAN-CHI)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as US$84 on Cheapest nonstop routes (e.g. SAN to ORD on Thu, Sep 17), while Frontier Airlines offers Cheapest nonstop round-trips from US$166 departing on Sat, Sep 26 and returning on Sat, Oct 3.

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

  At the moment, you can catch a nonstop flight from San Diego to Chicago with the following airlines, including: Alaska Airlines American 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 Diego to Chicago?

  It takes about 4 hours 27 minutes to fly from San Diego to Chicago.

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

  Based on Trip.com data in the past 4 weeks, there is 87 flight per week flying from San Diego to Chicago. You can check the weekly schedule for popular airlines on this route below: American Airlines: S/M/T/W/T/F/S -- AA518 (06:52)

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

  To find best deals on flights from San Diego 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 Thu, Sep 17, with one-way flights priced at just US$84.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska 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 Diego (SAN) to Chicago (CHI) the cheapest?

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

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

  After crunching the numbers on our August flight calendar, it's currently cheapest to fly from San Diego to Chicago on August 29, 2026 with Alaska Airlines, with prices starting at US$205.

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

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

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

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

• How do I change or cancel my ticket from San Diego 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.

• What is the average cost of a one-way flight from San Diego to Chicago?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from San Diego to Chicago is US$182. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from San Diego to Chicago?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from San Diego to Chicago is US$332. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from San Diego to Chicago on Trip.com?

  Enter San Diego and Chicago, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.