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$61+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap 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 January 28, 2026.

This Frontier deal was found by Cheapflights users on 1/27. 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 3/1112:25 am
LAS
-
ORD
Nonstop3h 43m
Frontier
Tue 3/178:55 pm
ORD
-
LAS
Nonstop4h 20m
Frontier
Deal found 1/27$133
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/114:10 pm
LAS
-
ORD
1 stop10h 39m
Frontier
Tue 3/248:55 pm
ORD
-
LAS
Nonstop4h 20m
Frontier
Deal found 1/27$134
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/2611:37 am
LAS
-
ORD
Nonstop3h 47m
Frontier
Sat 3/75:30 am
ORD
-
LAS
2 stops16h 45m
Frontier
Deal found 1/27$135
This Cheapflightsfares deal was found by Cheapflights users on 1/26. 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 2/2611:37 am
LAS
-
ORD
Nonstop3h 47m
Frontier
Fri 2/276:36 pm
ORD
-
LAS
Nonstop4h 28m
Frontier
Deal found 1/26$137
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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 2/2711:39 am
LAS
-
ORD
Nonstop3h 47m
Frontier
Mon 3/27:19 pm
ORD
-
LAS
Nonstop4h 23m
Frontier
Deal found 1/27$138
This Frontier deal was found by Cheapflights users on 1/27. 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 2/193:11 pm
LAS
-
ORD
Nonstop3h 52m
Frontier
Thu 2/2611:41 am
ORD
-
LAS
1 stop14h 03m
Frontier
Deal found 1/27$139
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 4/1612:59 am
LAS
-
ORD
Nonstop3h 48m
Multiple Airlines
Sun 4/198:53 pm
ORD
-
LAS
Nonstop4h 01m
Multiple Airlines
Deal found 1/27$140
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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 4/1611:59 pm
LAS
-
ORD
Nonstop3h 32m
Spirit Airlines
Sun 4/198:53 pm
ORD
-
LAS
Nonstop4h 01m
Spirit Airlines
Deal found 1/27$141
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Fri 4/1711:59 pm
LAS
-
ORD
Nonstop3h 32m
Spirit Airlines
Sun 4/198:53 pm
ORD
-
LAS
Nonstop4h 01m
Spirit Airlines
Deal found 1/27$142
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/2712:59 am
LAS
-
ORD
2 stops13h 54m
Frontier
Mon 3/27:19 pm
ORD
-
LAS
Nonstop4h 23m
Frontier
Deal found 1/27$143
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/1012:25 am
LAS
-
ORD
Nonstop3h 43m
Multiple Airlines
Wed 3/184:35 pm
ORD
-
LAS
1 stop9h 24m
Multiple Airlines
Deal found 1/27$144
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/259:45 am
SAN
-
ORD
1 stop22h 41m
Frontier
Sat 2/287:55 am
ORD
-
SAN
1 stop13h 58m
Frontier
Deal found 1/27$158

Find flight deals from California to Illinois

Keep the following information in mind while searching for California to Illinois flight deals. Data was last updated January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$133
(Frontier)

One-way from

$61
(Trip.com)

Popular in

January

Cheapest in

September

Average price

$369

Good round-trip deal

$255 or less

Good one-way deal

$135 or less
Provider with most accurate pricing for Los Angeles-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Chicago (CHI) flights.
Search Deals
From California to Illinois
Search Deals
One-way flight from California to Illinois
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from California to Illinois.
Search Deals
Price to beat on a one-way flight from California to Illinois.
Search Deals

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 January 28, 2026.
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

Fri 2/27

11:59 pm-5:31 am

Nonstop3h 32m

Chicago O'Hare Intl

Sun 3/1

9:15 pm-11:30 pm

Nonstop4h 15m

$159

San DiegoChicago

SAN - ORD

SANORD

San Diego

Thu 5/14

10:40 pm-4:45 am

Nonstop4h 05m

Chicago O'Hare Intl

Sat 5/16

8:46 am-11:25 am

Nonstop4h 39m

$167

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 4/24

4:49 pm-10:59 pm

Nonstop4h 10m

Chicago O'Hare Intl

Mon 4/27

4:15 pm-6:51 pm

Nonstop4h 36m

$177

San DiegoChicago

SAN - ORD

SANORD

San Diego

Thu 2/26

5:00 pm-10:59 pm

Nonstop3h 59m

Chicago O'Hare Intl

Mon 3/2

7:05 am-9:47 am

Nonstop4h 42m

$177

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Fri 4/17

11:59 pm-5:31 am

Nonstop3h 32m

Chicago O'Hare Intl

Sun 4/19

6:00 am-10:26 am

1 stop6h 26m

$180

San DiegoChicago

SAN - ORD

SANORD

San Diego

Sun 4/26

10:30 pm-4:35 am

Nonstop4h 05m

Chicago O'Hare Intl

Wed 4/29

8:46 am-11:25 am

Nonstop4h 39m

$187

San DiegoChicago

SAN - ORD

SANORD

San Diego

Tue 3/3

5:42 pm-11:59 pm

Nonstop4h 17m

Chicago O'Hare Intl

Tue 3/10

7:00 am-3:46 pm

1 stop10h 46m

$197

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 3/25

10:30 pm-4:29 am

Nonstop3h 59m

Chicago O'Hare Intl

Tue 3/31

12:55 pm-5:16 pm

1 stop6h 21m

$197

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 2/25

5:00 pm-11:00 pm

Nonstop4h 00m

Chicago O'Hare Intl

Wed 3/4

6:20 pm-11:40 pm

1 stop7h 20m

$197

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Wed 2/11

12:59 am-10:26 am

1 stop7h 27m

Chicago O'Hare Intl

Mon 2/16

7:19 pm-9:42 pm

Nonstop4h 23m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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, March is the cheapest month in which you can book a flight from California to Illinois (average of $77). Flying from California to Illinois in July is currently the most expensive (average of $136). 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 January 28, 2026.

It’s typically best to fly out from California to Illinois in the afternoon. Doing so could potentially save you 21% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from California to Illinois?

Use this chart to determine the cheapest time to fly round-trip from California to Illinois. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their California to Illinois flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 January 28, 2026.

The most flights from USCA to USIL are scheduled on a Monday (90 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (67 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 January 28, 2026.
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
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,206 reviews
Southwest
8.0
Very good
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,200 reviews
Southwest
8.0
Very good
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Spirit Airlines
6.3
Okay
8,383 reviews
Southwest
8.0
Very good
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,268 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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?

    United Airlines, Spirit Airlines, and Frontier can get you from California to Illinois in just under 3h 32m. Your travel time can differ by up to 3h 55m. 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 Spirit Airlines. According to our data, you can fly for as low as $30. Users have also found prices from $40 and $69 on Frontier and JetBlue, 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, March is the cheapest month in which you can book a flight from California to Illinois (average of $77). Flying from California to Illinois in July is currently the most expensive (average of $136). 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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$62Average$234FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$77Average$208FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$101Average$237FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$365FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$130Average$323FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$133Average$447FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$138Average$383FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$158Average$479FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$166Average$204FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$179Average$414FlexibilityNo cancel feeOn-time63%

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