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$538+ 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 1/1. Fares are subject to change and may not be available on all flights or dates of travel.
CMI — SAN
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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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 December 18, 2025.

This American Airlines deal was found by Cheapflights users on 12/16. 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 12/316:52 amCMI - SAN
1 stop7h 52mAmerican Airlines
Sun 1/46:15 amSAN - CMI
1 stop6h 12mAmerican Airlines
Deal found 12/16$917

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$538
(American Airlines)

Popular in

June

Cheapest in

May

Average price

$517
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. 0% potential increase in price ($3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 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

Thu 1/1

6:52 am-2:34 pm

1 stop9h 42m

San Diego

Wed 1/7

10:50 am-9:17 pm

1 stop8h 27m

$538

ChampaignSan Diego

CMI - SAN

CMISAN

Champaign University-Willard

Wed 12/31

6:52 am-12:44 pm

1 stop7h 52m

San Diego

Sun 1/4

6:15 am-2:27 pm

1 stop6h 12m

$917

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Champaign-San Diego flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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, May is the cheapest month in which you can book a flight from Champaign to San Diego (average of $132). Flying from Champaign to San Diego in March is currently the most expensive (average of $357). 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 December 18, 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
11,054 reviews

Food

6.5

Comfort

7.2

Boarding

7.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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
11,054 reviews
American Airlines
7.2
Good
11,054 reviews

Food

6.5

Comfort

7.2

Boarding

7.5

Overall

7.2

Entertainment

6.9

Crew

8.0

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 9h 42m. 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 29% 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, May is the cheapest month in which you can book a flight from Champaign to San Diego (average of $132). Flying from Champaign to San Diego in March is currently the most expensive (average of $357). 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
Coronado
National City
La Mesa
Poway
Julian
Lemon Grove

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$336Average$485FlexibilityNo cancel feeOn-time71%

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