$54+ Cheap flights from Illinois to California
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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LAX
Feb 28 — Mar 71
1 adult, Economy
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Illinois to CaliforniaExplore the most affordable flight options available from Illinois to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.
Explore the most affordable flight options available from Illinois to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- LAS
1 stop10h 53m
Frontier
Wed 3/46:30 am
LAS
- STL
1 stop7h 23m
Frontier
Deal found 1/28![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Fri 2/2710:11 pm
STL
- LAS
Nonstop3h 48m
Frontier
Fri 3/69:20 pm
LAS
- STL
1 stop10h 29m
Frontier
Deal found 1/29![Frontier logo]()
$126
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/212:51 pm
STL
- LAS
1 stop25h 39m
Frontier
Sat 2/2812:22 pm
LAS
- STL
Nonstop3h 24m
Frontier
Deal found 1/28![Frontier logo]()
$127
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/178:06 pm
STL
- LAS
Nonstop4h 02m
Frontier
Fri 3/206:05 am
LAS
- STL
Nonstop3h 14m
Frontier
Deal found 1/28![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Fri 3/68:12 pm
STL
- LAS
1 stop26h 03m
Frontier
Tue 3/101:51 pm
LAS
- STL
Nonstop3h 20m
Frontier
Deal found 1/29![Frontier logo]()
$136
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- LAS
1 stop21h 49m
Frontier
Sun 3/112:59 am
LAS
- STL
1 stop10h 10m
Frontier
Deal found 1/28![Frontier logo]()
$137
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Thu 3/54:10 pm
LAS
- STL
Nonstop3h 16m
Frontier
Deal found 1/29![Frontier logo]()
$138
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Tue 2/1711:03 pm
LAS
- STL
1 stop21h 24m
Frontier
Deal found 1/28![Frontier logo]()
$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.
Sun 3/86:19 pm
STL
- LAS
Nonstop3h 50m
Frontier
Thu 3/1212:59 am
LAS
- STL
1 stop6h 50m
Frontier
Deal found 1/27![Frontier logo]()
$141
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- LAS
1 stop20h 26m
Frontier
Fri 3/66:05 am
LAS
- STL
Nonstop3h 14m
Frontier
Deal found 1/28![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2710:11 pm
STL
- LAS
Nonstop3h 48m
Frontier
Tue 3/36:30 am
LAS
- STL
2 stops22h 21m
Frontier
Deal found 1/28![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/272:35 pm
ORD
- SAN
1 stop11h 33m
Frontier
Thu 3/511:59 am
SAN
- ORD
1 stop9h 15m
Frontier
Deal found 1/28![Frontier logo]()
$160
Best flights from Illinois to CaliforniaDiscover carefully curated flight deals from Illinois to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 29, 2026.
Discover carefully curated flight deals from Illinois to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 29, 2026.
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/282:15 pm
ORD
- SAN
1 stop8h 24m
United Airlines
Sat 5/210:40 pm
SAN
- ORD
Nonstop4h 05m
United Airlines
Deal found 1/27![United Airlines logo]()
$163
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:40 pm
MDW
- LAS
Nonstop4h 05m
Southwest
Fri 2/275:25 am
LAS
- MDW
Nonstop3h 25m
Southwest
Deal found 1/27![Southwest logo]()
$169
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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.
Wed 3/184:10 pm
ORD
- SAN
Nonstop4h 45m
Alaska Airlines
Tue 3/2412:15 pm
SAN
- ORD
Nonstop4h 25m
Alaska Airlines
Deal found 1/29![Alaska Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 1/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:30 pm
STL
- LAS
1 stop7h 20m
Delta
Tue 6/95:30 pm
LAS
- STL
1 stop5h 06m
Delta
Deal found 1/29![Delta logo]()
$233
This United Airlines deal was found by Cheapflights users on 1/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/114:20 pm
ORD
- SAN
Nonstop4h 40m
United Airlines
Sun 3/1510:30 pm
SAN
- ORD
Nonstop3h 59m
United Airlines
Deal found 1/29![United Airlines logo]()
$167
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:40 pm
MDW
- LAS
Nonstop4h 05m
Southwest
Sat 2/285:05 am
LAS
- MDW
Nonstop3h 25m
Southwest
Deal found 1/28![Southwest logo]()
$169
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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.
Thu 4/27:59 pm
ORD
- SAN
Nonstop4h 42m
Alaska Airlines
Tue 4/77:55 am
SAN
- ORD
Nonstop4h 26m
Alaska Airlines
Deal found 1/29![Alaska Airlines logo]()
$187
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/282:15 pm
ORD
- SAN
1 stop8h 24m
United Airlines
Sun 5/310:40 pm
SAN
- ORD
Nonstop4h 05m
United Airlines
Deal found 1/27![United Airlines logo]()
$173
This United Airlines deal was found by Cheapflights users on 1/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/217:45 pm
ORD
- LAS
Nonstop4h 17m
United Airlines
Wed 2/2511:59 pm
LAS
- ORD
Nonstop3h 32m
United Airlines
Deal found 1/28![United Airlines logo]()
$179
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:25 pm
ORD
- LAS
Nonstop4h 25m
Southwest
Wed 3/49:45 am
LAS
- ORD
Nonstop3h 40m
Southwest
Deal found 1/27![Southwest logo]()
$198
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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.
Fri 5/13:52 pm
ORD
- SAN
Nonstop4h 39m
Alaska Airlines
Fri 5/17:35 pm
SAN
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 1/29![Alaska Airlines logo]()
$201
This Delta deal was found by Cheapflights users on 1/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:59 pm
STL
- LAS
1 stop7h 29m
Delta
Sat 5/912:45 am
LAS
- STL
1 stop5h 55m
Delta
Deal found 1/29![Delta logo]()
$233
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/284:45 pm
MDW
- LAS
1 stop5h 40m
Southwest
Tue 3/311:40 pm
LAS
- MDW
Nonstop3h 25m
Southwest
Deal found 1/28![Southwest logo]()
$208
This Delta deal was found by Cheapflights users on 1/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:30 pm
STL
- LAS
1 stop7h 20m
Delta
Sun 5/176:25 am
LAS
- STL
1 stop8h 20m
Delta
Deal found 1/29![Delta logo]()
$233
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:47 am
ORD
- SAN
Nonstop4h 51m
United Airlines
Fri 2/273:40 pm
SAN
- ORD
1 stop6h 46m
United Airlines
Deal found 1/27![United Airlines logo]()
$197
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:00 am
ORD
- SAN
Nonstop4h 40m
United Airlines
Sun 4/268:39 pm
SAN
- ORD
1 stop7h 29m
United Airlines
Deal found 1/27![United Airlines logo]()
$197
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/17:15 am
ORD
- LAS
Nonstop4h 15m
Southwest
Thu 3/128:10 am
LAS
- ORD
Nonstop3h 45m
Southwest
Deal found 1/27![Southwest logo]()
$218
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/145:15 pm
ORD
- LAS
1 stop7h 09m
Delta
Fri 2/2012:50 am
LAS
- ORD
1 stop7h 35m
Delta
Deal found 1/27![Delta logo]()
$253
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/253:54 pm
ORD
- ONT
1 stop8h 50m
Alaska Airlines
Sat 2/286:14 am
ONT
- ORD
1 stop8h 19m
Alaska Airlines
Deal found 1/27![Alaska Airlines logo]()
$257
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:47 am
ORD
- SAN
Nonstop4h 51m
United Airlines
Wed 2/2512:55 pm
SAN
- ORD
1 stop6h 34m
United Airlines
Deal found 1/27![United Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 1/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/178:40 pm
MDW
- LAS
Nonstop4h 00m
Southwest
Tue 3/2411:55 pm
LAS
- MDW
Nonstop3h 25m
Southwest
Deal found 1/29![Southwest logo]()
$218
This Delta deal was found by Cheapflights users on 1/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/152:05 pm
ORD
- LAS
1 stop8h 32m
Delta
Fri 2/2012:14 pm
LAS
- ORD
1 stop7h 16m
Delta
Deal found 1/28![Delta logo]()
$253
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/247:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Wed 2/2512:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 1/27![Alaska Airlines logo]()
$257
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2012:55 pm
ORD
- SAN
1 stop6h 34m
United Airlines
Wed 2/255:00 pm
SAN
- ORD
Nonstop4h 00m
United Airlines
Deal found 1/27![United Airlines logo]()
$197
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/15:00 am
MDW
- LAS
Nonstop4h 15m
Southwest
Thu 3/126:10 pm
LAS
- MDW
Nonstop3h 30m
Southwest
Deal found 1/27![Southwest logo]()
$218
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/123:50 pm
STL
- LAS
1 stop6h 09m
Delta
Sat 5/1612:45 am
LAS
- STL
1 stop5h 55m
Delta
Deal found 1/27![Delta logo]()
$253
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/177:15 am
ORD
- LAS
Nonstop4h 15m
Southwest
Sat 2/216:05 am
LAS
- ORD
1 stop6h 00m
Southwest
Deal found 1/27![Southwest logo]()
$224
This United Airlines deal was found by Cheapflights users on 1/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/197:05 am
ORD
- SAN
Nonstop4h 42m
United Airlines
Tue 3/242:11 pm
SAN
- ORD
Nonstop4h 09m
United Airlines
Deal found 1/28![United Airlines logo]()
$204
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/121:00 pm
ORD
- LAX
1 stop8h 36m
Alaska Airlines
Tue 3/176:00 pm
LAX
- ORD
1 stop10h 39m
Alaska Airlines
Deal found 1/27![Alaska Airlines logo]()
$277
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:30 pm
STL
- LAS
1 stop7h 20m
Delta
Sat 5/161:55 pm
LAS
- STL
1 stop7h 06m
Delta
Deal found 1/27![Delta logo]()
$253
Last-minute flights from Illinois to CaliforniaDiscover last-minute flight deals from Illinois to California. Data last updated January 29, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to California. Data last updated January 29, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Tue 2/1711:03 pm
LAS
- STL
1 stop21h 24m
Frontier
Deal found 1/28![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Thu 2/198:35 pm
LAS
- STL
1 stop14h 34m
Frontier
Deal found 1/28![Frontier logo]()
$146
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/163:24 pm
MDW
- LAS
1 stop9h 27m
Frontier
Thu 2/198:23 pm
LAS
- MDW
1 stop21h 37m
Frontier
Deal found 1/26![Frontier logo]()
$161
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/212:51 pm
STL
- LAS
1 stop25h 39m
Frontier
Sat 2/2812:22 pm
LAS
- STL
Nonstop3h 24m
Frontier
Deal found 1/28![Frontier logo]()
$127
This WAYA 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:20 am
ORD
- SAN
Nonstop4h 49m
Multiple Airlines
Thu 2/2611:59 am
SAN
- ORD
1 stop9h 15m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Fri 2/2710:11 pm
STL
- LAS
Nonstop3h 48m
Frontier
Fri 3/69:20 pm
LAS
- STL
1 stop10h 29m
Frontier
Deal found 1/29![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2710:11 pm
STL
- LAS
Nonstop3h 48m
Frontier
Tue 3/36:30 am
LAS
- STL
2 stops22h 21m
Frontier
Deal found 1/28![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/272:35 pm
ORD
- SAN
1 stop11h 33m
Frontier
Thu 3/511:59 am
SAN
- ORD
1 stop9h 15m
Frontier
Deal found 1/28![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Fri 2/272:35 pm
ORD
- SAN
1 stop11h 33m
Frontier
Fri 3/66:25 am
SAN
- ORD
1 stop16h 32m
Frontier
Deal found 1/29![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- LAS
1 stop10h 53m
Frontier
Wed 3/46:30 am
LAS
- STL
1 stop7h 23m
Frontier
Deal found 1/28![Frontier logo]()
$125
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- LAS
1 stop19h 50m
Frontier
Sun 3/112:59 am
LAS
- STL
1 stop10h 10m
Frontier
Deal found 1/29![Frontier logo]()
$137
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Thu 3/54:10 pm
LAS
- STL
Nonstop3h 16m
Frontier
Deal found 1/29![Frontier logo]()
$138
One-way flights from Illinois to CaliforniaSearch for one-way flight options from Illinois to California. Find affordable one-way fares based on user searches. Data last updated January 29, 2026.
Search for one-way flight options from Illinois to California. Find affordable one-way fares based on user searches. Data last updated January 29, 2026.
This Frontier deal was found by Cheapflights users on 1/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Deal found 1/28![Frontier logo]()
$54
This Super.com deal was found by Cheapflights users on 1/29. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/89:32 pm
STL
- LAS
Nonstop3h 57m
Frontier
Deal found 1/29![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 1/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:41 pm
STL
- LAS
Nonstop3h 50m
Frontier
Deal found 1/29![Frontier logo]()
$59
This Trip.com deal was found by Cheapflights users on 1/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/237:19 pm
ORD
- ONT
1 stop20h 33m
Frontier
Deal found 1/29![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 3/78:12 pm
STL
- LAS
1 stop12h 04m
Frontier
Deal found 1/29![Frontier logo]()
$64
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/248:55 pm
ORD
- ONT
1 stop18h 33m
Frontier
Deal found 1/27![Frontier logo]()
$69
This Super.com deal was found by Cheapflights users on 1/28. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/231:54 pm
STL
- LAS
1 stop7h 37m
Frontier
Deal found 1/28![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 1/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/21:54 pm
STL
- LAS
1 stop7h 37m
Frontier
Deal found 1/29![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Mon 4/132:29 pm
ORD
- LAS
1 stop11h 08m
Frontier
Deal found 1/29![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/243:49 pm
STL
- LAS
1 stop20h 26m
Frontier
Deal found 1/28![Frontier logo]()
$77
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 2/272:35 pm
ORD
- LAS
1 stop25h 31m
Frontier
Deal found 1/27![Frontier logo]()
$78
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/163:24 pm
MDW
- LAS
1 stop9h 27m
Frontier
Deal found 1/27![Frontier logo]()
$78
Find flight deals from Illinois to California
Keep the following information in mind while searching for Illinois to California flight deals. Data was last updated January 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $125 (Kiwi.com) |
One-way from | $54 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $349 |
Good round-trip deal | $201 or less |
Good one-way deal | $98 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to California 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 29, 2026.
Use the filters below to find and compare flights from Illinois to California that are best for you.
Fly from
Illinois
Fly to
California
Route
Depart
Return
Price
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Tue 4/28
2:15 pm-8:39 pm
1 stop8h 24m
San Diego
Sat 5/2
10:40 pm-4:45 am
Nonstop4h 05m
$163
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Wed 3/11
4:20 pm-7:00 pm
Nonstop4h 40m
San Diego
Sun 3/15
10:30 pm-4:29 am
Nonstop3h 59m
$167
ChicagoLas Vegas
MDW - LAS
MDWLAS
Chicago Midway
Mon 2/23
8:40 pm-10:45 pm
Nonstop4h 05m
Las Vegas Harry Reid Intl
Fri 2/27
5:25 am-10:50 am
Nonstop3h 25m
$169
ChicagoLas Vegas
MDW - LAS
MDWLAS
Chicago Midway
Mon 2/23
8:40 pm-10:45 pm
Nonstop4h 05m
Las Vegas Harry Reid Intl
Sat 2/28
5:05 am-10:30 am
Nonstop3h 25m
$169
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Tue 4/28
2:15 pm-8:39 pm
1 stop8h 24m
San Diego
Sun 5/3
10:40 pm-4:45 am
Nonstop4h 05m
$173
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Wed 3/18
4:10 pm-6:55 pm
Nonstop4h 45m
San Diego
Tue 3/24
12:15 pm-6:40 pm
Nonstop4h 25m
$177
ChicagoLas Vegas
ORD - LAS
ORDLAS
Chicago O'Hare Intl
Sat 2/21
7:45 pm-10:02 pm
Nonstop4h 17m
Las Vegas Harry Reid Intl
Wed 2/25
11:59 pm-5:31 am
Nonstop3h 32m
$179
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Thu 4/2
7:59 pm-10:41 pm
Nonstop4h 42m
San Diego
Tue 4/7
7:55 am-2:21 pm
Nonstop4h 26m
$187
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Sat 2/21
8:47 am-11:38 am
Nonstop4h 51m
San Diego
Fri 2/27
3:40 pm-12:26 am
1 stop6h 46m
$197
ChicagoSan Diego
ORD - SAN
ORDSAN
Chicago O'Hare Intl
Wed 4/22
7:00 am-9:40 am
Nonstop4h 40m
San Diego
Sun 4/26
8:39 pm-6:08 am
1 stop7h 29m
$197
Showing 1-10 of 60 results
Best time to book a flight from Illinois to California
Have a flexible travel schedule? Discover the best time to fly to California from Illinois with our price prediction graph.
STL-LAS
ORD-ONT
ORD-LAS
MDW-LAS
ORD-SAN
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 Illinois to California
USIL-USCA
STL-LAS
ORD-ONT
ORD-LAS
MDW-LAS
What is the cheapest month to book a flight from Illinois to California?
Currently, September is the cheapest month in which you can book a flight from Illinois to California (average of $80). Flying from Illinois to California in January is currently the most expensive (average of $129). 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 IL to CA?
Find hourly flight availability from Illinois to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.
A simple way to save on the total cost of your ticket is to fly from Illinois to California in the evening. If you’re flexible enough to do this you can expect to save up to 16% on your trip compared to booking a flight in the afternoon.
What is the cheapest day to fly from Illinois to California?
Use this chart to determine the cheapest time to fly round-trip from Illinois to California. Price data was last updated on January 24, 2026.
Travelers seeking maximum savings on their Illinois to California flight should consider departing on Monday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Illinois to California
Explore weekly flight availability from Illinois to California. 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 29, 2026.
The most flights from USIL to USCA are scheduled on a Thursday (89 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (49 on average).
Reviews of airlines servicing California
Get insights into the airlines that provide service to California. 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 California. Reviews last updated January 29, 2026.
See what other customers who have flown with Southwest, United Airlines, and American Airlines from Illinois to California have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from Illinois to California. 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
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Illinois to California
See prices for flight routes from nearby airports that may be better suited for you.
Top 10 airlines flying from Illinois to California
Discover the top 10 airlines that operate flights from Illinois to California. 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 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$53 | Average$198 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$78 | Average$220 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$228 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$112 | Average$374 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$128 | Average$333 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$428 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$139 | Average$347 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$157 | Average$445 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$158 | Average$461 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$183 | Average$357 | FlexibilityNo cancel fee | On-time62% |