$59+ 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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LAX
Aug 29 — Sep 51
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to California with Cheapflights
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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 July 30, 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 July 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 9/156:29 am
STL
- LAS
1 stop11h 03m
Alaska Airlines
Sat 9/198:02 am
LAS
- STL
1 stop7h 08m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$137
This deal was found by Cheapflights users on 7/28. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:00 am
ORD
- ONT
1 stop7h 02m
Frontier
Sun 11/19:43 pm
ONT
- ORD
1 stop5h 52m
Frontier
Deal found 7/28![Frontier logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 9/143:19 pm
STL
- LAS
1 stop8h 22m
Alaska Airlines
Wed 9/168:02 am
LAS
- STL
1 stop7h 08m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$157
This Frontier deal was found by Cheapflights users on 7/30. 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 8/202:41 pm
ORD
- ONT
1 stop11h 09m
Frontier
Mon 8/249:33 am
ONT
- ORD
1 stop13h 16m
Frontier
Deal found 7/30![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 7/30. 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 9/58:45 am
ORD
- ONT
1 stop12h 16m
Frontier
Wed 9/911:45 am
ONT
- ORD
1 stop10h 38m
Frontier
Deal found 7/30![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Sun 9/131:02 pm
STL
- LAS
1 stop23h 44m
Frontier
Wed 9/169:45 am
LAS
- STL
1 stop7h 32m
Frontier
Deal found 7/28![Frontier logo]()
$161
This Booking.com deal was found by Cheapflights users on 7/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/78:11 pm
ORD
- ONT
1 stop21h 38m
Frontier
Thu 9/108:24 pm
ONT
- ORD
1 stop7h 14m
Frontier
Deal found 7/30![Frontier logo]()
$166
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Sat 10/1011:06 am
ORD
- ONT
1 stop14h 49m
Frontier
Tue 10/1311:16 am
ONT
- ORD
1 stop16h 26m
Frontier
Deal found 7/30![Frontier logo]()
$170
This Flightnetwork deal was found by Cheapflights users on 7/30. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:46 pm
ORD
- ONT
1 stop15h 46m
Frontier
Thu 9/33:40 pm
ONT
- ORD
1 stop25h 22m
Frontier
Deal found 7/30![Frontier logo]()
$172
This Trip.com deal was found by Cheapflights users on 7/29. 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.
Wed 8/266:45 pm
STL
- LAS
Nonstop3h 35m
Multiple Airlines
Wed 9/28:02 am
LAS
- STL
1 stop7h 08m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$172
This Expedia deal was found by Cheapflights users on 7/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:29 am
STL
- LAS
1 stop11h 03m
Multiple Airlines
Fri 9/186:10 am
LAS
- STL
Nonstop3h 17m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 10/2811:06 am
ORD
- ONT
1 stop14h 49m
Frontier
Mon 11/26:15 am
ONT
- ORD
1 stop25h 46m
Frontier
Deal found 7/27![Frontier logo]()
$177
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 July 30, 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 July 30, 2026.
This Southwest deal was found by Cheapflights users on 7/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:00 am
MDW
- LAX
Nonstop4h 15m
Southwest
Mon 9/1411:55 pm
LAX
- MDW
Nonstop4h 00m
Southwest
Deal found 7/26![Southwest logo]()
$247
This United Airlines deal was found by Cheapflights users on 7/30. 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 10/166:00 am
ORD
- LAX
Nonstop4h 27m
United Airlines
Sat 10/247:00 am
LAX
- ORD
Nonstop4h 15m
United Airlines
Deal found 7/30![United Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 9/97:40 pm
ORD
- LAX
Nonstop4h 30m
Delta
Wed 9/237:40 am
LAX
- ORD
Nonstop4h 04m
Delta
Deal found 7/28![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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.
Mon 8/246:01 am
ORD
- LAS
1 stop8h 03m
Alaska Airlines
Mon 8/317:07 pm
LAS
- ORD
1 stop16h 15m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$265
This KAYAK deal was found by Cheapflights users on 7/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:00 am
ORD
- SFO
1 stop7h 01m
American Airlines
Thu 10/296:00 am
SFO
- ORD
Nonstop4h 34m
American Airlines
Deal found 7/27![American Airlines logo]()
$436
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/225:55 am
ORD
- LAX
Nonstop4h 27m
United Airlines
Tue 9/298:15 am
LAX
- ORD
Nonstop4h 21m
United Airlines
Deal found 7/30![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 7/27. 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.
Wed 9/29:25 am
MDW
- LAX
1 stop5h 40m
Southwest
Tue 9/811:55 pm
LAX
- MDW
Nonstop4h 00m
Southwest
Deal found 7/27![Southwest logo]()
$253
This Delta deal was found by Cheapflights users on 7/30. 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.
Wed 9/167:00 am
ORD
- LAX
1 stop10h 23m
Delta
Sun 9/207:40 am
LAX
- ORD
Nonstop4h 04m
Delta
Deal found 7/30![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/32:25 pm
ORD
- LAS
1 stop8h 25m
Alaska Airlines
Tue 11/107:05 pm
LAS
- ORD
1 stop16h 18m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 7/25. 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.
Thu 9/175:40 am
MDW
- LAX
1 stop5h 50m
Southwest
Sun 9/2711:55 pm
LAX
- MDW
Nonstop4h 00m
Southwest
Deal found 7/25![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 7/29. 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 10/157:16 am
ORD
- LAX
Nonstop4h 34m
Delta
Sat 10/177:05 am
LAX
- ORD
1 stop7h 48m
Delta
Deal found 7/29![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:49 pm
ORD
- SAN
Nonstop4h 38m
Alaska Airlines
Sat 10/247:00 am
SAN
- ORD
Nonstop4h 25m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$267
This United Airlines deal was found by Cheapflights users on 7/29. 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 11/188:40 am
ORD
- SAN
1 stop6h 16m
United Airlines
Sun 11/2210:30 pm
SAN
- ORD
Nonstop4h 04m
United Airlines
Deal found 7/29![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 7/29. 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.
Tue 10/277:16 am
ORD
- LAX
Nonstop4h 34m
Delta
Fri 10/307:05 am
LAX
- ORD
1 stop7h 48m
Delta
Deal found 7/29![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:15 pm
MDW
- LAX
Nonstop4h 15m
Southwest
Sun 9/611:55 pm
LAX
- MDW
Nonstop4h 00m
Southwest
Deal found 7/25![Southwest logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/242:18 pm
ORD
- SAN
Nonstop4h 37m
Alaska Airlines
Sun 9/277:03 am
SAN
- ORD
Nonstop4h 19m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$277
This United Airlines deal was found by Cheapflights users on 7/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:00 pm
ORD
- SFO
Nonstop4h 50m
United Airlines
Wed 8/194:29 pm
SFO
- ORD
Nonstop4h 30m
United Airlines
Deal found 7/26![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 7/29. 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 8/275:30 am
ORD
- ONT
1 stop7h 12m
Delta
Sat 9/512:00 pm
ONT
- ORD
1 stop9h 57m
Delta
Deal found 7/29![Delta logo]()
$259
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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.
Fri 10/167:20 am
ORD
- SAN
Nonstop4h 36m
Alaska Airlines
Wed 10/217:00 am
SAN
- ORD
Nonstop4h 25m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$279
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 9/112:45 pm
ORD
- LAS
Nonstop3h 59m
United Airlines
Sat 9/129:08 am
LAS
- ORD
Nonstop3h 52m
United Airlines
Deal found 7/28![United Airlines logo]()
$283
This Southwest deal was found by Cheapflights users on 7/25. 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 8/292:40 pm
MDW
- LAS
Nonstop3h 50m
Southwest
Sat 9/126:35 am
LAS
- MDW
Nonstop3h 30m
Southwest
Deal found 7/25![Southwest logo]()
$283
This Delta deal was found by Cheapflights users on 7/30. 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 9/248:55 am
ORD
- LAX
1 stop7h 31m
Delta
Sun 9/2710:45 pm
LAX
- ORD
1 stop7h 11m
Delta
Deal found 7/30![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 7/30. 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 9/145:30 pm
MDW
- LAS
Nonstop3h 55m
Southwest
Wed 9/237:55 am
LAS
- MDW
Nonstop3h 35m
Southwest
Deal found 7/30![Southwest logo]()
$283
This United Airlines deal was found by Cheapflights users on 7/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:50 am
ORD
- SAN
Nonstop4h 35m
United Airlines
Tue 10/204:55 pm
SAN
- ORD
Nonstop4h 04m
United Airlines
Deal found 7/26![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 7/27. 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.
Thu 9/31:59 pm
ORD
- LAX
1 stop8h 10m
Delta
Tue 9/811:30 am
LAX
- ORD
1 stop8h 03m
Delta
Deal found 7/27![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:16 pm
ORD
- LAS
1 stop17h 56m
Alaska Airlines
Tue 10/203:54 pm
LAS
- ORD
1 stop19h 31m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$296
This Southwest deal was found by Cheapflights users on 7/29. 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.
Wed 8/268:35 am
MDW
- LAS
Nonstop3h 55m
Southwest
Wed 9/27:55 am
LAS
- MDW
Nonstop3h 35m
Southwest
Deal found 7/29![Southwest logo]()
$283
This United Airlines deal was found by Cheapflights users on 7/25. 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 9/181:30 pm
ORD
- SAN
Nonstop4h 19m
United Airlines
Tue 9/224:55 pm
SAN
- ORD
Nonstop4h 04m
United Airlines
Deal found 7/25![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 7/28. 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.
Fri 11/66:30 am
ORD
- LAX
1 stop9h 53m
Delta
Mon 11/1610:45 pm
LAX
- ORD
1 stop7h 01m
Delta
Deal found 7/28![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/212:54 pm
ORD
- SAN
Nonstop4h 25m
Alaska Airlines
Sun 1/248:00 am
SAN
- ORD
Nonstop3h 54m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$313
Last-minute flights from Illinois to CaliforniaDiscover last-minute flight deals from Illinois to California. Data last updated July 30, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to California. Data last updated July 30, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/30. 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 8/202:41 pm
ORD
- ONT
1 stop11h 09m
Frontier
Mon 8/249:33 am
ONT
- ORD
1 stop13h 16m
Frontier
Deal found 7/30![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 7/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:20 pm
ORD
- LAX
Nonstop4h 44m
Frontier
Mon 8/3111:59 pm
LAX
- ORD
Nonstop4h 18m
Frontier
Deal found 7/26![Frontier logo]()
$198
This Super.com deal was found by Cheapflights users on 7/26. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:20 pm
ORD
- LAX
Nonstop4h 44m
Frontier
Tue 8/2511:59 pm
LAX
- ORD
Nonstop4h 18m
Frontier
Deal found 7/26![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 7/29. 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.
Sun 8/237:58 pm
STL
- LAS
1 stop13h 11m
Frontier
Wed 8/269:04 pm
LAS
- STL
1 stop20h 09m
Frontier
Deal found 7/29![Frontier logo]()
$196
This Booking.com deal was found by Cheapflights users on 7/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:11 pm
ORD
- ONT
1 stop21h 43m
Frontier
Tue 9/19:37 am
ONT
- ORD
1 stop8h 38m
Frontier
Deal found 7/30![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Mon 8/247:58 pm
STL
- LAS
1 stop5h 49m
Frontier
Thu 8/276:00 am
LAS
- STL
1 stop11h 13m
Frontier
Deal found 7/28![Frontier logo]()
$193
This Trip.com deal was found by Cheapflights users on 7/29. 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.
Wed 8/266:45 pm
STL
- LAS
Nonstop3h 35m
Multiple Airlines
Wed 9/28:02 am
LAS
- STL
1 stop7h 08m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$172
This Flightnetwork deal was found by Cheapflights users on 7/30. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:46 pm
ORD
- ONT
1 stop15h 46m
Frontier
Thu 9/33:40 pm
ONT
- ORD
1 stop25h 22m
Frontier
Deal found 7/30![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Thu 8/277:58 pm
STL
- LAS
1 stop5h 49m
Frontier
Sun 8/3012:57 am
LAS
- STL
1 stop16h 16m
Frontier
Deal found 7/26![Frontier logo]()
$194
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:26 pm
MDW
- LAX
1 stop13h 38m
Frontier
Sat 9/511:34 pm
LAX
- MDW
1 stop9h 21m
Frontier
Deal found 7/30![Frontier logo]()
$198
This Expedia deal was found by Cheapflights users on 7/30. 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.
Sat 8/296:45 pm
STL
- LAS
Nonstop3h 35m
Multiple Airlines
Sat 9/58:02 am
LAS
- STL
1 stop7h 08m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$188
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
Sun 8/307:36 pm
STL
- LAS
1 stop17h 11m
Alaska Airlines
Wed 9/28:02 am
LAS
- STL
1 stop7h 08m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$157
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 July 30, 2026.
Search for one-way flight options from Illinois to California. Find affordable one-way fares based on user searches. Data last updated July 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 10/285:32 pm
STL
- LAS
Nonstop3h 43m
Frontier
Deal found 7/25![Frontier logo]()
$59
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 9/296:29 am
STL
- LAS
1 stop9h 12m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$69
This Super.com deal was found by Cheapflights users on 7/30. 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 10/56:30 am
ORD
- ONT
1 stop6h 00m
Frontier
Deal found 7/30![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 7/30. 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.
Thu 9/101:01 pm
ORD
- ONT
1 stop7h 38m
Frontier
Deal found 7/30![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 7/29. 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.
Wed 9/168:10 pm
STL
- LAS
1 stop14h 18m
Frontier
Deal found 7/29![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 10/268:10 pm
STL
- LAS
1 stop29h 21m
Frontier
Deal found 7/29![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 7/30. 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.
Sat 8/228:45 am
ORD
- ONT
1 stop12h 16m
Frontier
Deal found 7/30![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 9/288:10 pm
STL
- LAS
1 stop14h 18m
Frontier
Deal found 7/29![Frontier logo]()
$85
This Booking.com deal was found by Cheapflights users on 7/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:41 pm
ORD
- ONT
1 stop21h 23m
Frontier
Deal found 7/30![Frontier logo]()
$86
This Trip.com deal was found by Cheapflights users on 7/30. 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.
Wed 10/2811:06 am
ORD
- ONT
1 stop14h 49m
Frontier
Deal found 7/30![Frontier logo]()
$89
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
Mon 8/316:35 am
STL
- LAS
1 stop10h 53m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 9/308:10 pm
STL
- LAS
2 stops29h 18m
Frontier
Deal found 7/30![Frontier logo]()
$94
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 July 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Alaska Airlines) |
One-way from | $59 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $359 |
Good round-trip deal | $268 or less |
Good one-way deal | $119 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 July 30, 2026.
Use the filters below to find and compare flights from Illinois to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoLos Angeles
MDW - LAX
MDWLAX
Chicago Midway
Fri 9/11
7:00 am-9:15 am
Nonstop4h 15m
Los Angeles
Mon 9/14
11:55 pm-5:55 am
Nonstop4h 00m
$247
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Fri 10/16
6:00 am-8:27 am
Nonstop4h 27m
Los Angeles
Sat 10/24
7:00 am-1:15 pm
Nonstop4h 15m
$247
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Wed 9/9
7:40 pm-10:10 pm
Nonstop4h 30m
Los Angeles
Wed 9/23
7:40 am-1:44 pm
Nonstop4h 04m
$247
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Tue 9/22
5:55 am-8:22 am
Nonstop4h 27m
Los Angeles
Tue 9/29
8:15 am-2:36 pm
Nonstop4h 21m
$247
ChicagoLos Angeles
MDW - LAX
MDWLAX
Chicago Midway
Wed 9/2
9:25 am-1:05 pm
1 stop5h 40m
Los Angeles
Tue 9/8
11:55 pm-5:55 am
Nonstop4h 00m
$253
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Wed 9/16
7:00 am-3:23 pm
1 stop10h 23m
Los Angeles
Sun 9/20
7:40 am-1:44 pm
Nonstop4h 04m
$257
ChicagoLos Angeles
MDW - LAX
MDWLAX
Chicago Midway
Thu 9/17
5:40 am-9:30 am
1 stop5h 50m
Los Angeles
Sun 9/27
11:55 pm-5:55 am
Nonstop4h 00m
$257
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Thu 10/15
7:16 am-9:50 am
Nonstop4h 34m
Los Angeles
Sat 10/17
7:05 am-4:53 pm
1 stop7h 48m
$257
ChicagoLos Angeles
ORD - LAX
ORDLAX
Chicago O'Hare Intl
Tue 10/27
7:16 am-9:50 am
Nonstop4h 34m
Los Angeles
Fri 10/30
7:05 am-4:53 pm
1 stop7h 48m
$257
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Thu 8/27
5:30 am-10:42 am
1 stop7h 12m
Ontario
Sat 9/5
12:00 pm-11:57 pm
1 stop9h 57m
$259
Showing 1-10 of 60 resultsSorted by cheapest first
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
MDW-LAX
ORD-LAS
ORD-LAX
ORD-SNA
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
MDW-LAX
ORD-LAS
ORD-LAX
What is the cheapest month to book a flight from Illinois to California?
Currently, October is the cheapest month in which you can book a flight from Illinois to California (average of $315). Flying from Illinois to California in June is currently the most expensive (average of $432). 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 July 30, 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 21% on your trip compared to booking a flight at noon.
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 July 30, 2026.
The most flights from USIL to USCA are scheduled on a Thursday (139 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (78 on average).
How much does it cost to fly round-trip from Illinois to California?
Airfare is typical for this route at the moment.
Illinois to California flights typically cost between $180 and $349 in August.The cheapest round-trip price found within the last 5 days was $197 on Frontier (Aug 22-Aug 25).
How far ahead should I book a flight from Illinois to California?
The price you pay for your flight from Illinois to California may vary depending on when you book. For the best chance of a lower fare, look to book 49 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 July 25, 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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 July 30, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andUnited 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.
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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.
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Alternative routes for Illinois to California
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to California by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to California by cabin class
Find flights from Illinois to California, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and California flights
Browse other Illinois and California flight options. Last updated on July 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from California
Find the right flight back to Illinois after your stay in California
Illinois to California flights
Consider these flights traveling from Illinois to California.
Top 8 airlines flying from Illinois to California
Discover the top 8 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 July 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$255 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$359 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$237 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$154 | Average$413 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$157 | Average$479 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$157 | Average$433 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$159 | Average$348 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$164 | Average$452 | FlexibilityNo cancel fee | On-time63% |