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Flights from San Diego to Champaign

Find flight deals from San Diego to Champaign for the next 3 months. Book one way flights from $234 or round trip flights from $445.

      • SAN 10:57 AM
        9h 4m
        1 stop
        CMI 10:01 PM
        San Diego - Champaign | Fri, May 22 | American Airlines
        CMI 6:39 PM
        7h
        1 stop
        SAN 11:39 PM
        Champaign - San Diego | Tue, May 26 | American Airlines
        $445 $969
        54% off
        54% off
        $969 $445
      • SAN 10:45 PM
        10h 22m
        1 stop
        CMI 11:07 AM
        San Diego - Champaign | Thu, May 21 | American Airlines
        CMI 6:39 PM
        7h
        1 stop
        SAN 11:39 PM
        Champaign - San Diego | Mon, May 25 | American Airlines
        $637 $969
        34% off
        34% off
        $969 $637
      • SAN 6:15 AM
        12h 53m
        1 stop
        CMI 9:08 PM
        San Diego - Champaign | Sun, Jun 28 | American Airlines
        CMI 6:36 PM
        6h 52m
        1 stop
        SAN 11:28 PM
        Champaign - San Diego | Fri, Jul 3 | American Airlines
        $656 $969
        32% off
        32% off
        $969 $656
      • SAN 1:18 PM
        6h 17m
        1 stop
        CMI 9:35 PM
        San Diego - Champaign | Thu, May 14 | American Airlines
        CMI 6:55 PM
        6h 38m
        1 stop
        SAN 11:33 PM
        Champaign - San Diego | Mon, May 18 | American Airlines
        $678
        30% off
        $969 $678
      • SAN 1:00 PM
        17h 25m
        1 stop
        CMI 2:00 PM
        San Diego - Champaign | Tue, May 12 | Normal Airline
        CMI 3:00 PM
        6h
        Nonstop
        SAN 4:00 PM
        Champaign - San Diego | Thu, May 14 | Normal Airline
        Find more flights
        Find more flights
      • SAN 10:40 PM
        8h 14m
        1 stop
        CMI 8:54 AM
        San Diego - Champaign | Mon, May 25 | United Airlines
        $234 $688
        66% off
        66% off
        $688 $234
      • SAN 6:15 AM
        6h 16m
        1 stop
        CMI 2:31 PM
        San Diego - Champaign | Mon, May 18 | American Airlines
        $249 $688
        64% off
        64% off
        $688 $249
      • SAN 1:55 PM
        6h 6m
        1 stop
        CMI 10:01 PM
        San Diego - Champaign | Mon, May 25 | American Airlines
        $307 $688
        55% off
        55% off
        $688 $307
      • SAN 1:18 PM
        6h 17m
        1 stop
        CMI 9:35 PM
        San Diego - Champaign | Thu, May 14 | American Airlines
        $347
        50% off
        $688 $347
      • SAN 1:18 PM
        6h 17m
        1 stop
        CMI 9:35 PM
        San Diego - Champaign | Fri, May 15 | American Airlines
        $384
        44% off
        $688 $384
      • SAN 10:45 PM
        17h 24m
        1 stop
        CMI 6:09 PM
        San Diego - Champaign | Thu, May 21 | American Airlines
        $481
        30% off
        $688 $481
      • SAN 1:00 PM
        17h 25m
        1 stop
        CMI 2:00 PM
        San Diego - Champaign | Tue, May 12 | Normal Airline
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Displayed flight fares from San Diego to Champaign are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Frequently Asked Questions

  • What are the cheapest flights from San Diego to Champaign (SAN-CMI)?

    Based on Trip.com data, United Airlines offers one-way fares as low as $234 on Cheapest nonstop routes (e.g. SAN to CMI on Mon, May 25), while American Airlines offers Cheapest nonstop round-trips from $445 departing on Fri, May 22 and returning on Tue, May 26.
  • At the moment, several airlines serve connecting flights from San Diego to Champaign, including: American Airlines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • 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 Champaign 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.
  • To find best deals on flights from San Diego to Champaign, 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 Mon, May 25, with one-way flights priced at just $234.
    · 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 Champaign travel is around September.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from San Diego to Champaign is August, when demand for travel is lower.
  • After crunching the numbers on our May flight calendar, it's currently cheapest to fly from San Diego to Champaign on May 22, 2026 with American Airlines, with prices starting at $445.
  • You can land at any one of the following hubs in Champaign, with San Diego International Airport to University Of Illinois Willard Airport (SAN-CMI) is by far the most common option on this route: University Of Illinois Willard Airport (CMI).
  • The time difference between Champaign and San Diego is 2h.
  • 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.

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Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

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Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
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.
Cancellation/change due to a flight schedule change:
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.