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Illinois

$52+ Cheap flights from California to Illinois

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheap flight deals from California to Illinois

Keep the following information in mind while searching for California to Illinois flight deals. Data was last updated July 31, 2025.

Round-trip from

$119
(CheapOair)

One-way from

$51
(Cheapflightsfares)

Popular in

December

Cheapest in

February

Average price

$307

Good round-trip deal

$228 or less

Good one-way deal

$135 or less
From California to Illinois
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One-way flight from California to Illinois
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Highest demand for flights based on searches. 7% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from California to Illinois.
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Price to beat on a one-way flight from California to Illinois.
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Find flight deals from California to Illinois

Cheapest flights from California to Illinois
Explore the most affordable flight options available from California to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This CheapOair deal was found by Cheapflights users on 7/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/275:42 pmBUR - ORD
1 stop9h 08mSpirit Airlines
Wed 9/36:21 pmORD - BUR
1 stop5h 38mSpirit Airlines
Deal found 7/31$119
This American Airlines deal was found by Cheapflights users on 7/31. 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.
Sun 8/2410:45 pmSAN - ORD
Nonstop4h 09mAmerican Airlines
Sat 8/309:55 amORD - SAN
Nonstop4h 20mAmerican Airlines
Deal found 7/31$158
This Mytrip deal was found by Cheapflights users on 7/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/201:17 pmSAN - ORD
2 stops14h 23mSpirit Airlines
Tue 8/266:21 pmORD - SAN
1 stop15h 00mSpirit Airlines
Deal found 7/31$159
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/131:17 pmSAN - ORD
1 stop13h 33mMultiple Airlines
Thu 8/217:00 amORD - SAN
Nonstop4h 20mMultiple Airlines
Deal found 7/30$163
This Frontier deal was found by Cheapflights users on 7/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/114:46 pmLAX - ORD
Nonstop4h 18mFrontier
Sun 10/266:20 amORD - LAX
Nonstop4h 26mFrontier
Deal found 7/31$165
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:58 pmLAX - ORD
1 stop6h 52mSpirit Airlines
Sun 8/247:05 amORD - LAX
Nonstop4h 23mSpirit Airlines
Deal found 7/30$166
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/134:51 pmLAX - ORD
Nonstop4h 22mMultiple Airlines
Wed 9/249:00 amORD - LAX
1 stop6h 33mMultiple Airlines
Deal found 7/29$167
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:19 pmSAN - ORD
Nonstop4h 40mAlaska Airlines
Sun 10/262:54 pmORD - SAN
Nonstop4h 25mAlaska Airlines
Deal found 7/29$168
This SmartFares deal was found by Cheapflights users on 7/30. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/254:53 pmSAN - ORD
Nonstop4h 22mFrontier
Mon 9/297:55 amORD - SAN
Nonstop4h 35mFrontier
Deal found 7/30$175
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:49 pmSAN - ORD
Nonstop4h 10mHawaiian Airlines
Mon 11/39:20 amORD - SAN
Nonstop4h 25mHawaiian Airlines
Deal found 7/28$177
This CheapOair deal was found by Cheapflights users on 7/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/410:56 amOAK - ORD
2 stops15h 53mSpirit Airlines
Sat 10/115:46 pmORD - OAK
1 stop7h 46mSpirit Airlines
Deal found 7/29$181
This Southwest deal was found by Cheapflights users on 7/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/108:50 amSAN - ORD
1 stop5h 55mSouthwest
Tue 9/167:30 amORD - SAN
2 stops9h 50mSouthwest
Deal found 7/31$182

Cheapflights Fare Finder

 
Customize your flight search to find flights from California to Illinois 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 July 31, 2025.
Use the filters below to find and compare flights from California to Illinois that are best for you.

Fly from

California

Fly to

Illinois

Route

Depart

Return

Price

BurbankChicago

BUR - ORD

BURORD

Burbank Bob Hope

Wed 8/27

5:42 pm-4:50 am

1 stop9h 08m

Chicago O'Hare Intl

Wed 9/3

6:21 pm-9:59 pm

1 stop5h 38m

$119

San DiegoChicago

SAN - ORD

SANORD

San Diego

Sun 8/24

10:45 pm-4:54 am

Nonstop4h 09m

Chicago O'Hare Intl

Sat 8/30

9:55 am-12:15 pm

Nonstop4h 20m

$158

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 8/20

1:17 pm-5:40 am

2 stops14h 23m

Chicago O'Hare Intl

Tue 8/26

6:21 pm-7:21 am

1 stop15h 00m

$159

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 8/13

1:17 pm-4:50 am

1 stop13h 33m

Chicago O'Hare Intl

Thu 8/21

7:00 am-9:20 am

Nonstop4h 20m

$163

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Sat 10/11

4:46 pm-11:04 pm

Nonstop4h 18m

Chicago O'Hare Intl

Sun 10/26

6:20 am-8:46 am

Nonstop4h 26m

$165

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Fri 8/22

7:58 pm-4:50 am

1 stop6h 52m

Chicago O'Hare Intl

Sun 8/24

7:05 am-9:28 am

Nonstop4h 23m

$166

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Sat 9/13

4:51 pm-11:13 pm

Nonstop4h 22m

Chicago O'Hare Intl

Wed 9/24

9:00 am-1:33 pm

1 stop6h 33m

$167

San DiegoChicago

SAN - ORD

SANORD

San Diego

Sat 10/18

5:19 pm-11:59 pm

Nonstop4h 40m

Chicago O'Hare Intl

Sun 10/26

2:54 pm-5:19 pm

Nonstop4h 25m

$168

San DiegoChicago

SAN - ORD

SANORD

San Diego

Thu 9/25

4:53 pm-11:15 pm

Nonstop4h 22m

Chicago O'Hare Intl

Mon 9/29

7:55 am-10:30 am

Nonstop4h 35m

$175

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 10/31

5:49 pm-11:59 pm

Nonstop4h 10m

Chicago O'Hare Intl

Mon 11/3

9:20 am-11:45 am

Nonstop4h 25m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 60 results
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Best time to book a flight from California to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from California 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 California to Illinois

What is the cheapest month to book a flight from California to Illinois?

Currently, August is the cheapest month in which you can book a flight from California to Illinois (average of $245). Flying from California to Illinois in March is currently the most expensive (average of $321). 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.

What is the cheapest time of day to fly from CA to IL?

Find hourly flight availability from California to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from California to Illinois as you normally would.

Weekly flight availability from California to Illinois

Explore weekly flight availability from California to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 31, 2025.

The most flights from USCA to USIL are scheduled on a Thursday (135 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (79 on average).

How much does it cost to fly round-trip from California to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated July 31, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from California to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

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

  • What are the cheapest airlines to fly from California to Illinois one-way?

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $51. Users have also found prices from $85 and $89 on Frontier and American Airlines, respectively.

  • Can I find deals for flights from California to Illinois that include hotel bookings?

    Yes. In addition to deals on California to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from California to Illinois?

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

  • Can I find deals for business class flights from California to Illinois?

    Yes. Cheapflights offers flight deals from California to Illinois 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 California to Illinois?

    Currently, August is the cheapest month in which you can book a flight from California to Illinois (average of $245). Flying from California to Illinois in March is currently the most expensive (average of $321). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for California to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from California to Illinois

Discover the top 10 airlines that operate flights from California to Illinois. 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$44Average$130FlexibilityNo cancel feeOn-time88%
Spirit AirlinesCheapest$67Average$209FlexibilityNo cancel feeOn-time65%
FrontierCheapest$96Average$230FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$288FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$372FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$130Average$330FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$133Average$472FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$138Average$379FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$157Average$427FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$183Average$478FlexibilityNo cancel feeOn-time71%

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