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$47+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$73
(Cheapflightsfares)

One-way from

$47
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$311

Good round-trip deal

$265 or less

Good one-way deal

$149 or less
Provider with most accurate pricing for Los Angeles-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Chicago (CHI) flights.
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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. 4% potential increase in price ($12 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 April 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 April 17, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1012:41 amLAX - ORD
Nonstop4h 01mSpirit Airlines
Tue 5/208:37 amORD - LAX
Nonstop4h 31mSpirit Airlines
Deal found 4/16$73
This Frontier deal was found by Cheapflights users on 4/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/284:53 pmSAN - ORD
Nonstop4h 03mFrontier
Sat 7/121:56 pmORD - SAN
Nonstop4h 12mFrontier
Deal found 4/16$136
This Cheapflightsfares deal was found by Cheapflights users on 4/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/224:46 pmLAX - ORD
Nonstop4h 19mFrontier
Tue 5/276:10 amORD - LAX
Nonstop4h 34mFrontier
Deal found 4/16$145
This Gotogate deal was found by Cheapflights users on 4/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/118:05 pmLAX - ORD
1 stop7h 05mMultiple Airlines
Tue 5/208:37 amORD - LAX
Nonstop4h 31mMultiple Airlines
Deal found 4/16$159
This Frontier deal was found by Cheapflights users on 4/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/165:25 pmLAX - MDW
1 stop9h 58mFrontier
Tue 4/2912:19 pmMDW - LAX
1 stop6h 14mFrontier
Deal found 4/16$178
This American Airlines deal was found by Cheapflights users on 4/16. 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.
Sat 5/2411:49 pmSFO - ORD
Nonstop4h 24mAmerican Airlines
Fri 5/304:51 pmORD - SFO
Nonstop4h 46mAmerican Airlines
Deal found 4/16$179
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/247:20 amSFO - MDW
1 stop7h 30mSouthwest
Fri 5/306:10 pmMDW - SFO
1 stop7h 40mSouthwest
Deal found 4/16$198
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/215:20 pmLAX - MDW
Nonstop4h 05mSouthwest
Wed 5/286:40 amMDW - LAX
Nonstop4h 25mSouthwest
Deal found 4/16$200
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:45 amSNA - ORD
1 stop26h 10mSpirit Airlines
Sun 5/119:02 pmORD - SNA
1 stop15h 50mSpirit Airlines
Deal found 4/16$205
This Frontier deal was found by Cheapflights users on 4/17. 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.
Tue 4/2211:38 pmSFO - MDW
1 stop8h 27mFrontier
Thu 4/246:15 amMDW - SFO
1 stop8h 30mFrontier
Deal found 4/17$209
This SmartFares deal was found by Cheapflights users on 4/17. 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.
Sat 5/2412:33 pmSFO - ORD
Nonstop4h 26mAlaska Airlines
Fri 5/307:59 pmORD - SFO
Nonstop4h 50mAlaska Airlines
Deal found 4/17$209
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/59:09 pmOAK - ORD
1 stop11h 46mSpirit Airlines
Wed 6/1111:50 amORD - OAK
1 stop12h 35mSpirit Airlines
Deal found 4/16$209

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 April 17, 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

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Sat 5/10

12:41 am-6:42 am

Nonstop4h 01m

Chicago O'Hare Intl

Tue 5/20

8:37 am-11:08 am

Nonstop4h 31m

$73

San DiegoChicago

SAN - ORD

SANORD

San Diego

Sat 6/28

4:53 pm-10:56 pm

Nonstop4h 03m

Chicago O'Hare Intl

Sat 7/12

1:56 pm-4:08 pm

Nonstop4h 12m

$136

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Thu 5/22

4:46 pm-11:05 pm

Nonstop4h 19m

Chicago O'Hare Intl

Tue 5/27

6:10 am-8:44 am

Nonstop4h 34m

$145

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Sun 5/11

8:05 pm-5:10 am

1 stop7h 05m

Chicago O'Hare Intl

Tue 5/20

8:37 am-11:08 am

Nonstop4h 31m

$159

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

Wed 5/7

10:35 pm-1:34 pm

1 stop12h 59m

Chicago Midway

Tue 5/13

9:34 am-9:35 pm

1 stop14h 01m

$178

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sat 5/24

11:49 pm-6:13 am

Nonstop4h 24m

Chicago O'Hare Intl

Fri 5/30

4:51 pm-7:37 pm

Nonstop4h 46m

$179

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Sat 5/24

7:20 am-4:50 pm

1 stop7h 30m

Chicago Midway

Fri 5/30

6:10 pm-11:50 pm

1 stop7h 40m

$198

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

Wed 5/21

5:20 pm-11:25 pm

Nonstop4h 05m

Chicago Midway

Wed 5/28

6:40 am-9:05 am

Nonstop4h 25m

$200

Santa AnaChicago

SNA - ORD

SNAORD

Santa Ana J. Wayne/Orange Cnty

Thu 5/8

6:45 am-10:55 am

1 stop26h 10m

Chicago O'Hare Intl

Sun 5/11

9:02 pm-10:52 am

1 stop15h 50m

$205

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sat 5/24

12:33 pm-6:59 pm

Nonstop4h 26m

Chicago O'Hare Intl

Fri 5/30

7:59 pm-10:49 pm

Nonstop4h 50m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

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 April 17, 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 April 17, 2025.

The most flights from USCA to USIL are scheduled on a Thursday (108 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (58 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 April 17, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from California to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,882 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,382 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $47. Users have also found prices from $87 and $90 on Frontier and Southwest, 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

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

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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$49Average$120FlexibilityNo cancel feeOn-time88%
FrontierCheapest$61Average$227FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$74Average$232FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$115Average$420FlexibilityNo cancel feeOn-time75%
Sun Country AirCheapest$130Average$346FlexibilityNo cancel feeOn-time83%
Hawaiian AirlinesCheapest$138Average$277FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$157Average$441FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$179Average$468FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$183Average$475FlexibilityNo cancel feeOn-time71%
DeltaCheapest$235Average$440FlexibilityNo cancel feeOn-timeN/A

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