HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$324+ Cheap flights from Champaign to San Diego (CMI - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
CMI — SAN
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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

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 September 17, 2025.

Round-trip from

$452
(American Airlines)

One-way from

$324
(American Airlines)

Popular in

June

Cheapest in

February

Average price

$414
From Champaign University-Willard to San Diego
Search Deals
One-way flight from Champaign University-Willard to San Diego
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find 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 September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 11/196:45 amCMI - SAN
1 stop8h 00mAmerican Airlines
Sun 11/236:15 amSAN - CMI
1 stop6h 30mAmerican Airlines
Deal found 9/14$452
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 12/116:10 amCMI - SAN
1 stop8h 20mAmerican Airlines
Tue 12/306:15 amSAN - CMI
1 stop6h 12mAmerican Airlines
Deal found 9/15$488
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 10/13:32 pmCMI - SAN
1 stop6h 48mAmerican Airlines
Sun 10/511:02 amSAN - CMI
1 stop7h 49mAmerican Airlines
Deal found 9/16$534
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/73:49 pmCMI - SAN
1 stop7h 23mAmerican Airlines
Sun 10/1210:45 amSAN - CMI
1 stop8h 27mAmerican Airlines
Deal found 9/15$535

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 September 17, 2025.
Use the filters below to find and compare flights from Champaign to San Diego that are best for you.

Fly from

Champaign

Fly to

San Diego

Route

Depart

Return

Price

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Wed 11/19

6:45 am-12:45 pm

1 stop8h 00m

San Diego

Sun 11/23

6:15 am-2:45 pm

1 stop6h 30m

$452

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Thu 12/11

6:10 am-12:30 pm

1 stop8h 20m

San Diego

Tue 12/30

6:15 am-2:27 pm

1 stop6h 12m

$488

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Wed 10/1

3:32 pm-8:20 pm

1 stop6h 48m

San Diego

Sun 10/5

11:02 am-8:51 pm

1 stop7h 49m

$534

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Tue 10/7

3:49 pm-9:12 pm

1 stop7h 23m

San Diego

Sun 10/12

10:45 am-9:12 pm

1 stop8h 27m

$535

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Tue 9/30

3:32 pm-8:20 pm

1 stop6h 48m

$324

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Sun 11/16

6:45 am-12:45 pm

1 stop8h 00m

$446

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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.

Cheapflights Insights

Everything you need to know about your flight from Champaign to San Diego

What is the cheapest month to book a flight from Champaign to San Diego?

Currently, August is the cheapest month in which you can book a flight from Champaign to San Diego (average of $286). Flying from Champaign to San Diego in March is currently the most expensive (average of $366). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 September 17, 2025.
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
7.2
Good
10,000 reviews

Overall

7.2

Comfort

7.2

Crew

8.0

Food

6.4

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Diana,Jul 2024

ORD - IND

Shout out to Isabelle and Debbie who went above and beyond to make it a good experience. Wheelchair service and workers were excellent and much appreciated.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Overall

7.2

Comfort

7.2

Crew

8.0

Food

6.4

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
8.0
Excellent

Diana,Jul 2024

ORD - IND

Shout out to Isabelle and Debbie who went above and beyond to make it a good experience. Wheelchair service and workers were excellent and much appreciated.

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. 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 $336, 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.

  • What is the cheapest month to book a flight from Champaign to San Diego?

    Currently, August is the cheapest month in which you can book a flight from Champaign to San Diego (average of $286). Flying from Champaign to San Diego in March is currently the most expensive (average of $366). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Chula Vista
La Mesa
Poway
Lemon Grove
Coronado
Imperial Beach
National City

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 Ontario flights
O'Hare Intl to Santa Ana flights
Midway to Los Angeles flights
St. Louis to Las Vegas flights
O'Hare Intl to San Diego flights
O'Hare Intl to Palm Springs flights
Midway to San Francisco flights
O'Hare Intl to Burbank flights
O'Hare Intl to Sacramento flights
O'Hare Intl to San Jose flights
Midway to San Diego flights
St. Louis to Los Angeles flights
Midway to Santa Ana flights
Midway to Ontario flights
Rockford to Las Vegas flights
St. Louis to San Francisco flights
O'Hare Intl to Oakland flights
O'Hare Intl to Reno flights
Midway to Palm Springs flights
St. Louis to San Diego flights
Midway to San Jose flights
O'Hare Intl to Long Beach flights
Midway to Oakland flights
O'Hare Intl to Fresno flights
St. Louis to Ontario flights
Midway to Sacramento flights
Peoria to Las Vegas flights
Moline to Las Vegas flights
St. Louis to Santa Ana flights
O'Hare Intl to Santa Barbara flights
St. Louis to Palm Springs flights
St. Louis to Sacramento flights
Bloomington to Las Vegas flights
Midway to Reno flights
St. Louis to Long Beach flights
Midway to Burbank flights
Peoria to San Francisco flights
O'Hare Intl to San Luis Obispo flights
Moline to Los Angeles flights
O'Hare Intl to Monterey flights
Evansville to Las Vegas flights
Moline to San Diego flights
St. Louis to San Jose flights
Peoria to San Diego flights
Moline to Ontario flights
Midway to Long Beach 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$336Average$485FlexibilityNo 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.