HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$399+ Cheap flights from Champaign to San Diego (CMI - SAN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
CMI — SAN
Jul 30 — Aug 61
Thu 7/30
Thu 8/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Champaign to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Champaign to San Diego

Cheapest flights from Champaign to San Diego
Explore the most affordable flight options available from Champaign to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 30, 2026.

This American Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/84:54 pm
CMI
-
SAN
1 stop8h 53m
American Airlines
Thu 9/1712:08 pm
SAN
-
CMI
1 stop7h 38m
American Airlines
Deal found 6/28$399
This American Airlines deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/32:46 pm
CMI
-
SAN
1 stop6h 34m
American Airlines
Thu 8/61:41 pm
SAN
-
CMI
1 stop6h 19m
American Airlines
Deal found 6/26$427
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/86:36 pm
CMI
-
SAN
1 stop7h 19m
American Airlines
Wed 8/126:15 am
SAN
-
CMI
1 stop8h 09m
American Airlines
Deal found 6/30$434
This American Airlines deal was found by Cheapflights users on 6/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/146:36 pm
CMI
-
SAN
1 stop6h 50m
American Airlines
Sat 7/189:41 am
SAN
-
CMI
2 stops10h 18m
American Airlines
Deal found 6/29$491
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/912:21 pm
CMI
-
SAN
1 stop9h 07m
American Airlines
Sun 10/1110:06 am
SAN
-
CMI
1 stop8h 19m
American Airlines
Deal found 6/30$548
This American Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/136:28 pm
CMI
-
SAN
1 stop6h 58m
American Airlines
Fri 7/179:41 am
SAN
-
CMI
2 stops10h 18m
American Airlines
Deal found 6/28$697

Find flight deals from Champaign to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Champaign (CMI) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$399
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$585
Provider with most accurate pricing for Champaign University-Willard-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Champaign University-Willard-San Diego flights.
Search Deals
From Champaign University-Willard to San Diego
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Champaign to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 30, 2026.
Use the filters below to find and compare flights from Champaign to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Tue 9/8

4:54 pm-11:47 pm

1 stop8h 53m

San Diego

Thu 9/17

12:08 pm-9:46 pm

1 stop7h 38m

$399
Quickest round-trip

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Mon 8/3

2:46 pm-7:20 pm

1 stop6h 34m

San Diego

Thu 8/6

1:41 pm-10:00 pm

1 stop6h 19m

$427

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Tue 7/14

6:36 pm-11:26 pm

1 stop6h 50m

San Diego

Sat 7/18

9:41 am-9:59 pm

2 stops10h 18m

$491

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Fri 10/9

12:21 pm-7:28 pm

1 stop9h 07m

San Diego

Sun 10/11

10:06 am-8:25 pm

1 stop8h 19m

$548

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Sat 8/8

7:00 am-3:26 pm

2 stops10h 26m

San Diego

Wed 8/12

9:40 am-10:00 pm

2 stops10h 20m

$597

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Sorted by cheapest first

Compare providers for flights from Champaign to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Champaign to San Diego in June.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Champaign-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Champaign-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Champaign-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Champaign-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Champaign-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Champaign to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Champaign with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated June 30, 2026.
See what other customers who have flown with American Airlines from Champaign to San Diego have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,762 reviews

Comfort

7.2

Entertainment

6.8

Overall

7.1

Crew

7.9

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes
American Airlines
7.1
Good
11,762 reviews
American Airlines
7.1
Good
11,762 reviews

Comfort

7.2

Entertainment

6.8

Overall

7.1

Crew

7.9

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2026

MIA - SFO

Horrible. When they power flights for other airlines there is nothing they can do to change or accommodate any changes

Related info for your journey

Find useful and relevant information for your journey from Champaign to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Champaign to San Diego?

    Airlines like American Airlines fly from Champaign to San Diego in about 8h 53m. The time it takes to get you to your destination can typically vary by up to . Champaign and San Diego are separated by a distance of 1676 mi.

  • What is the cheapest airline to fly from Champaign to San Diego round-trip?

    American Airlines, at $379, was found to be the cheapest airline from Champaign to San Diego.. American Airlines is priced at 28% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Champaign to San Diego that include hotel bookings?

    Yes. In addition to deals on Champaign to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Champaign to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Champaign to San Diego.

  • Can I find deals for business class flights from Champaign to San Diego?

    Yes. Cheapflights offers flight deals from Champaign to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
National City
Chula Vista
Poway
La Mesa
Coronado
Santee
Julian
Lemon Grove

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Champaign to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Las Vegas flights
O'Hare Intl to Los Angeles flights
Midway to Las Vegas flights
O'Hare Intl to San Francisco flights
O'Hare Intl to San Diego flights
O'Hare Intl to Ontario flights
St. Louis to Las Vegas flights
O'Hare Intl to Santa Ana flights
Midway to Los Angeles flights
Midway to San Francisco flights
O'Hare Intl to San Jose flights
St. Louis to Los Angeles flights
O'Hare Intl to Sacramento flights
O'Hare Intl to Burbank flights
O'Hare Intl to Reno flights
O'Hare Intl to Palm Springs flights
Midway to San Diego flights
O'Hare Intl to Oakland flights
St. Louis to San Francisco flights
O'Hare Intl to Fresno flights
Rockford to Las Vegas flights
St. Louis to San Diego flights
O'Hare Intl to Santa Barbara flights
Moline to Las Vegas flights
Midway to San Jose flights
Midway to Oakland flights
O'Hare Intl to Long Beach flights
St. Louis to Ontario flights
Midway to Palm Springs flights
Midway to Ontario flights
Midway to Reno flights
St. Louis to Sacramento flights
St. Louis to San Jose flights
O'Hare Intl to Monterey flights
St. Louis to Burbank flights
St. Louis to Oakland flights
Midway to Long Beach flights
Midway to Sacramento flights
St. Louis to Reno flights
St. Louis to Santa Ana flights
Peoria to Las Vegas flights
Peoria to San Francisco flights
St. Louis to Palm Springs flights
Moline to San Francisco flights
Moline to San Diego flights
O'Hare Intl to Santa Rosa flights
Moline to Los Angeles flights
Bloomington to Las Vegas flights

Top airline flying from Champaign to San Diego

Discover the top airline that operate flights from Champaign to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$379Average$498FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.