Cheap Flights from San Diego to Chicago from S$ 123

Frequently Asked Questions

• Which airlines offer the cheapest flights from San Diego to Chicago?

  Based on Trip.com data, Frontier Airlines offers Cheapest nonstop one-way flights from S$ 123 (for example, SAN–ORD on Tue, Sep 22). For a Cheapest nonstop return flight, Frontier Airlines offers fares from S$ 211, 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 direct flight from San Diego to Chicago with the following airlines, including: 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 Diego (SAN) to Chicago (CHI)?

  It takes about 4 hours 27 minutes to fly from San Diego (SAN) to Chicago (CHI).

• 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 from San Diego to Chicago each week?

  On average, 87 direct flights operate each week between San Diego and Chicago. See below the schedules of the main airlines serving this route:
  Alaska Airlines: S/M/T/W/T/F/S – AS1446 (departure at 07:20)

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

  Here are some tips for finding the best flight deals from San Diego to Chicago on Trip.com:
  · Be flexible with your travel dates. The cheapest flight is currently on Tue, Sep 22, with one-way fares from just S$ 123.
  · Compare airlines. Alaska Airlines currently offers the lowest fares on this route.
  · Set up a price alert to track fare changes without searching every day.
  · Check Trip.com regularly for flight deals and available promo codes.
  · Avoid peak season or book early. July is generally the busiest month for travel to Chicago.
  · Get exclusive promo codes on the Trip.com app.

• When is the best time to book a flight from San Diego to Chicago to get the best price?

  The cheapest month to book a flight from San Diego to Chicago is usually September, when demand is lower.

• Which upcoming date is the cheapest for flights from San Diego to Chicago?

  After crunching the numbers on our September flight calendar, it's currently cheapest to fly from San Diego to Chicago on September 24, 2026 with Frontier Airlines, with prices starting at S$ 108.

• Which airports should you choose for flights from San Diego to Chicago?

  Flights to Chicago can arrive at: O'Hare International Airport (ORD)Chicago Midway International Airport (MDW)Chicago Rockford International Airport (RFD). The most common route connects San Diego International Airport and O'Hare International Airport (SAN–ORD).

• What is the time difference between San Diego and Chicago?

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

• How can I change or cancel my flight ticket from San Diego to Chicago?

  Tickets can only be changed or cancelled 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 S$ 228. 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 S$ 430. 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 traveller details and complete payment to receive your confirmation.