$66+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
ene. 14 — ene. 211
1 adult, Economy
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from California to Illinois
Cheapest flights from California to IllinoisExplore 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 diciembre 15, 2025.
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 diciembre 15, 2025.
This Frontier deal was found by Cheapflights users on 12/12. 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.
jue. 12/258:35 amLAS - ORD
Nonstop3h 42mFrontier
dom. 1/410:49 pmORD - LAS
Nonstop4h 09mFrontier
Deal found 12/12![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 12/12. 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.
jue. 12/258:35 amLAS - ORD
Nonstop3h 42mFrontier
lun. 1/512:39 pmORD - LAS
1 stop11h 13mFrontier
Deal found 12/12![Frontier logo]()
$130
This Cheapflightsfares deal was found by Cheapflights users on 12/12. 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.
jue. 12/258:35 amLAS - ORD
Nonstop3h 42mFrontier
sáb. 1/36:10 amORD - LAS
1 stop11h 48mFrontier
Deal found 12/12![Frontier logo]()
$131
This Frontier deal was found by Cheapflights users on 12/12. 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.
jue. 12/258:35 amLAS - ORD
Nonstop3h 42mFrontier
vie. 1/21:27 pmORD - LAS
1 stop11h 12mFrontier
Deal found 12/12![Frontier logo]()
$155
This Expedia deal was found by Cheapflights users on 12/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/259:41 amLAX - ORD
Nonstop4h 08mFrontier
jue. 1/19:33 pmORD - LAX
1 stop12h 42mFrontier
Deal found 12/13![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mié. 12/313:47 pmLAS - ORD
1 stop12h 18mMultiple Airlines
dom. 1/410:49 pmORD - LAS
Nonstop4h 09mMultiple Airlines
Deal found 12/15![Multiple Airlines logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
jue. 12/2511:59 pmLAX - ORD
Nonstop4h 06mMultiple Airlines
jue. 1/19:33 pmORD - LAX
1 stop12h 42mMultiple Airlines
Deal found 12/15![Multiple Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 12/12. 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.
jue. 12/258:35 amLAS - ORD
Nonstop3h 42mFrontier
jue. 1/13:27 pmORD - LAS
Nonstop4h 19mFrontier
Deal found 12/12![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 12/12. 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.
jue. 12/253:58 pmLAX - ORD
1 stop6h 14mFrontier
jue. 1/88:35 amORD - LAX
1 stop30h 13mFrontier
Deal found 12/12![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
mar. 12/3012:59 amLAS - ORD
1 stop21h 13mFrontier
jue. 1/810:32 pmORD - LAS
Nonstop4h 09mFrontier
Deal found 12/15![Frontier logo]()
$168
This Trip.com deal was found by Cheapflights users on 12/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/3111:59 pmLAX - ORD
Nonstop4h 06mMultiple Airlines
dom. 1/410:49 pmORD - LAX
1 stop20h 15mMultiple Airlines
Deal found 12/14![Multiple Airlines logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
jue. 12/259:41 amLAX - ORD
Nonstop4h 08mMultiple Airlines
dom. 1/47:44 pmORD - LAX
Nonstop4h 45mMultiple Airlines
Deal found 12/13![Multiple Airlines logo]()
$170
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 diciembre 15, 2025.
Most accurate provider | Justfly.com 3 stars |
|---|---|
Most trusted provider | Justfly.com 3 stars |
Round-trip from | $100 (Kiwi.com) |
One-way from | $66 (United Airlines) |
Popular in | December |
Cheapest in | September |
Average price | $368 |
Good round-trip deal | $299 or less |
Good one-way deal | $150 or less |
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 diciembre 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
vie. 1/16
3:19 pm-9:11 pm
Nonstop3h 52m
Chicago O'Hare Intl
dom. 1/18
6:30 am-8:19 pm
1 stop15h 49m
$106
San DiegoChicago
SAN - ORD
SANORD
San Diego
mié. 2/18
8:35 am-2:58 pm
Nonstop4h 23m
Chicago O'Hare Intl
mié. 2/25
8:20 am-11:09 am
Nonstop4h 49m
$157
San DiegoChicago
SAN - ORD
SANORD
San Diego
mié. 2/18
5:00 pm-11:00 pm
Nonstop4h 00m
Chicago O'Hare Intl
sáb. 2/21
8:47 am-11:38 am
Nonstop4h 51m
$157
San DiegoChicago
SAN - ORD
SANORD
San Diego
mar. 2/17
8:35 am-2:58 pm
Nonstop4h 23m
Chicago O'Hare Intl
mar. 2/24
3:07 pm-5:52 pm
Nonstop4h 45m
$157
San DiegoChicago
SAN - ORD
SANORD
San Diego
sáb. 2/14
5:42 pm-11:59 pm
Nonstop4h 17m
Chicago O'Hare Intl
mar. 2/17
3:07 pm-5:52 pm
Nonstop4h 45m
$157
San DiegoChicago
SAN - ORD
SANORD
San Diego
sáb. 1/17
2:11 pm-8:25 pm
Nonstop4h 14m
Chicago O'Hare Intl
dom. 1/18
2:40 pm-8:49 pm
1 stop8h 09m
$163
San DiegoChicago
SAN - ORD
SANORD
San Diego
sáb. 1/17
2:11 pm-8:25 pm
Nonstop4h 14m
Chicago O'Hare Intl
lun. 1/19
7:57 pm-10:33 pm
Nonstop4h 36m
$167
San DiegoChicago
SAN - ORD
SANORD
San Diego
jue. 1/15
8:00 am-2:29 pm
Nonstop4h 29m
Chicago O'Hare Intl
dom. 1/18
3:44 pm-6:26 pm
Nonstop4h 42m
$167
San DiegoChicago
SAN - ORD
SANORD
San Diego
dom. 1/11
4:47 pm-10:59 pm
Nonstop4h 12m
Chicago O'Hare Intl
dom. 1/18
1:00 pm-3:33 pm
Nonstop4h 33m
$167
San DiegoChicago
SAN - ORD
SANORD
San Diego
sáb. 1/24
8:00 am-2:29 pm
Nonstop4h 29m
Chicago O'Hare Intl
dom. 1/25
9:00 am-11:43 am
Nonstop4h 43m
$167
Showing 1-10 of 60 results
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 diciembre 15, 2025.
It’s typically best to fly out from California to Illinois in the afternoon. Doing so could potentially save you 24% 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 December 16, 2024.
Travelers seeking maximum savings on their California to Illinois flight should consider departing on Wednesday mornings when fares are most often at their lowest. Monday 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 diciembre 15, 2025.
The most flights from USCA to USIL are scheduled on a Monday (90 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 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 diciembre 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.
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Comfort
8.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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.
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.
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 diciembre 15, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$208 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$88 | Average$235 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$243 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$128 | Average$355 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$130 | Average$330 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$133 | Average$454 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$138 | Average$382 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$167 | Average$482 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$179 | Average$418 | FlexibilityNo cancel fee | On-time63% |