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Illinois

$74+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$112
(Kiwi.com)

One-way from

$74
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$279

Good round-trip deal

$205 or less

Good one-way deal

$144 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. 9% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Fri 10/32:57 pmLAS - ORD
Nonstop4h 02mFrontier
Sun 10/129:54 pmORD - LAS
Nonstop4h 05mFrontier
Deal found 9/13$112
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:45 pmLAS - ORD
Nonstop3h 58mFrontier
Sat 11/157:15 amORD - LAS
1 stop10h 31mFrontier
Deal found 9/14$113
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/262:57 pmLAS - ORD
Nonstop4h 02mFrontier
Mon 9/299:54 pmORD - LAS
Nonstop4h 11mFrontier
Deal found 9/14$114
This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:10 pmLAS - ORD
1 stop6h 49mFrontier
Mon 9/229:54 pmORD - LAS
Nonstop4h 11mFrontier
Deal found 9/13$115
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Tue 11/412:50 amLAS - ORD
Nonstop3h 35mMultiple Airlines
Fri 11/710:43 pmORD - LAS
Nonstop4h 01mMultiple Airlines
Deal found 9/13$117
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Tue 12/912:50 amLAS - ORD
Nonstop3h 35mMultiple Airlines
Sun 12/143:53 pmORD - LAS
Nonstop4h 10mMultiple Airlines
Deal found 9/13$118
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/166:49 amLAS - ORD
Nonstop3h 42mMultiple Airlines
Sun 10/199:54 pmORD - LAS
Nonstop4h 05mMultiple Airlines
Deal found 9/15$119
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3012:55 amLAS - ORD
1 stop7h 45mMultiple Airlines
Wed 10/86:35 amORD - LAS
Nonstop3h 54mMultiple Airlines
Deal found 9/14$120
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/262:57 pmLAS - ORD
Nonstop4h 02mFrontier
Fri 10/39:54 pmORD - LAS
Nonstop4h 11mFrontier
Deal found 9/14$122
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/256:00 amLAS - ORD
Nonstop3h 48mFrontier
Mon 9/299:54 pmORD - LAS
Nonstop4h 11mFrontier
Deal found 9/14$123
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:30 pmLAS - ORD
Nonstop3h 47mSpirit Airlines
Sat 10/1811:55 amORD - LAS
1 stop11h 07mSpirit Airlines
Deal found 9/14$124
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/102:54 pmLAS - ORD
Nonstop4h 00mFrontier
Tue 10/147:15 amORD - LAS
1 stop27h 47mFrontier
Deal found 9/14$125

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 September 15, 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

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 10/30

12:59 am-12:16 am

1 stop21h 17m

Chicago O'Hare Intl

Sun 11/2

10:43 pm-12:44 am

Nonstop4h 01m

$125

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 10/16

6:49 am-12:31 pm

Nonstop3h 42m

Chicago O'Hare Intl

Sun 10/19

6:40 am-8:34 am

Nonstop3h 54m

$127

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 9/25

10:41 am-10:45 pm

1 stop10h 04m

Chicago O'Hare Intl

Mon 9/29

6:15 am-8:15 am

Nonstop4h 00m

$130

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Fri 10/3

2:57 pm-8:59 pm

Nonstop4h 02m

Chicago O'Hare Intl

Wed 10/15

7:15 am-1:13 pm

1 stop7h 58m

$133

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Wed 10/1

9:36 am-6:14 pm

1 stop6h 38m

Chicago O'Hare Intl

Wed 10/8

6:35 am-8:29 am

Nonstop3h 54m

$135

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Tue 9/30

12:55 am-10:40 am

1 stop7h 45m

Chicago O'Hare Intl

Thu 10/2

7:09 pm-7:40 am

1 stop14h 31m

$138

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 10/23

12:59 am-12:59 am

1 stop22h 00m

Chicago O'Hare Intl

Mon 10/27

10:51 am-1:13 pm

1 stop28h 22m

$147

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 10/9

12:59 am-12:59 am

1 stop22h 00m

Chicago O'Hare Intl

Tue 10/14

7:15 am-6:55 pm

1 stop13h 40m

$148

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Wed 12/10

4:55 pm-10:35 pm

Nonstop3h 40m

Chicago O'Hare Intl

Sun 12/14

7:15 am-9:20 am

Nonstop4h 05m

$153

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 11/5

1:41 pm-7:55 pm

Nonstop4h 14m

Chicago O'Hare Intl

Tue 11/11

8:59 pm-11:19 pm

Nonstop4h 20m

$153

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 September 15, 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 September 15, 2025.

The most flights from USCA to USIL are scheduled on a Friday (124 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (75 on average).

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 September 15, 2025.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from California to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,015 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • How long is the flight from California to Illinois?

    Frontier, Spirit Airlines, and Hawaiian Airlines can get you from California to Illinois in just under 3h 42m. Your travel time can differ by up to 17h 35m. The distance from California to Illinois is about 1510 mi. This flight may include one or multiple stops.

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

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $77. Users have also found prices from $80 and $83 on United Airlines 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

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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 9 airlines flying from California to Illinois

Discover the top 9 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$91Average$237FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$97Average$217FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$108Average$243FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$371FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$130Average$330FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$133Average$470FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$139Average$335FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$157Average$420FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$167Average$480FlexibilityNo cancel feeOn-time71%

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