$86+ Cheap flights from California to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ORD
Apr 14 — Apr 211
Round-trip
1 adult, Economy
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Find cheap flights from California to Illinois with Cheapflights
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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 March 15, 2026.
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 March 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/1811:42 am
SAN
- ORD
1 stop20h 03m
Frontier
Sat 4/258:55 am
ORD
- SAN
1 stop7h 29m
Frontier
Deal found 3/11![Frontier logo]()
$173
This eDestinos deal was found by Cheapflights users on 3/13. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:23 pm
SAN
- ORD
1 stop19h 37m
Frontier
Mon 4/207:35 am
ORD
- SAN
1 stop12h 13m
Frontier
Deal found 3/13![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/109:28 pm
SAN
- ORD
1 stop25h 10m
Frontier
Mon 4/139:06 pm
ORD
- SAN
1 stop18h 11m
Frontier
Deal found 3/11![Frontier logo]()
$175
This Southwest deal was found by Cheapflights users on 3/10. 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 4/2511:30 am
SAN
- ORD
2 stops9h 55m
Southwest
Sat 5/23:05 pm
ORD
- SAN
2 stops10h 20m
Southwest
Deal found 3/10![Southwest logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/116:25 am
SAN
- ORD
1 stop16h 13m
Frontier
Mon 4/139:06 pm
ORD
- SAN
1 stop18h 11m
Frontier
Deal found 3/11![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 4/2310:53 pm
LAX
- ORD
1 stop16h 07m
Multiple Airlines
Mon 4/275:15 am
ORD
- LAX
Nonstop4h 20m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/206:43 pm
SAN
- ORD
2 stops33h 25m
Frontier
Sun 4/267:50 am
ORD
- SAN
1 stop25h 56m
Frontier
Deal found 3/10![Frontier logo]()
$179
This Cheapflightsfares deal was found by Cheapflights users on 3/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:22 pm
LAX
- ORD
Nonstop4h 05m
Spirit Airlines
Sun 5/175:15 am
ORD
- LAX
Nonstop4h 20m
Spirit Airlines
Deal found 3/15![Spirit Airlines logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/187:15 am
SAN
- ORD
1 stop24h 30m
Frontier
Tue 4/218:58 pm
ORD
- SAN
1 stop18h 19m
Frontier
Deal found 3/10![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1711:36 pm
LAX
- ORD
Nonstop4h 14m
Frontier
Thu 4/305:20 am
ORD
- LAX
1 stop9h 10m
Frontier
Deal found 3/10![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/222:12 pm
SAN
- ORD
1 stop13h 13m
Multiple Airlines
Sat 5/28:55 am
ORD
- SAN
1 stop7h 29m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 4/2310:53 pm
LAX
- MDW
1 stop20h 57m
Frontier
Sun 4/266:20 am
MDW
- LAX
1 stop17h 44m
Frontier
Deal found 3/13![Frontier logo]()
$181
Best flights from California to IllinoisDiscover carefully curated flight deals from California to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 15, 2026.
Discover carefully curated flight deals from California to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 15, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:51 am
SAN
- ORD
1 stop11h 08m
Alaska Airlines
Sat 5/93:52 pm
ORD
- SAN
Nonstop4h 39m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 3/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:30 am
SAN
- ORD
2 stops9h 25m
Southwest
Sat 4/183:05 pm
ORD
- SAN
2 stops10h 20m
Southwest
Deal found 3/14![Southwest logo]()
$227
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/3010:40 pm
SAN
- ORD
Nonstop4h 05m
United Airlines
Mon 5/47:05 am
ORD
- SAN
Nonstop4h 37m
United Airlines
Deal found 3/10![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 3/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/307:39 pm
SMF
- ORD
2 stops11h 01m
Delta
Thu 4/27:10 pm
ORD
- SMF
1 stop6h 32m
Delta
Deal found 3/13![Delta logo]()
$286
This Spirit deal was found by Cheapflights users on 3/12. 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 Spirit is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:01 pm
LAX
- ORD
1 stop9h 24m
Spirit Airlines
Mon 6/156:16 pm
ORD
- LAX
1 stop7h 37m
Spirit Airlines
Deal found 3/12![Spirit Airlines logo]()
$336
This JetBlue deal was found by Cheapflights users on 3/10. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/68:45 pm
LAX
- ORD
1 stop8h 56m
JetBlue
Sat 5/98:31 am
ORD
- LAX
1 stop10h 38m
JetBlue
Deal found 3/10![JetBlue logo]()
$365
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:03 am
SAN
- ORD
Nonstop4h 10m
Alaska Airlines
Tue 4/286:00 am
ORD
- SAN
1 stop9h 27m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 3/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/185:40 am
LAX
- MDW
Nonstop4h 00m
Southwest
Sat 4/256:00 pm
MDW
- LAX
Nonstop4h 25m
Southwest
Deal found 3/14![Southwest logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:36 pm
SAN
- ORD
Nonstop4h 07m
Alaska Airlines
Tue 4/288:50 am
ORD
- SAN
Nonstop4h 40m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 3/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:52 pm
SFO
- ORD
Nonstop4h 28m
United Airlines
Sat 4/259:40 pm
ORD
- SFO
Nonstop4h 59m
United Airlines
Deal found 3/14![United Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 3/10. 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 5/2311:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Wed 5/279:00 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Deal found 3/10![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 3/11. 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 5/137:00 am
BUR
- ORD
2 stops11h 14m
Delta
Tue 5/192:00 pm
ORD
- BUR
2 stops9h 45m
Delta
Deal found 3/11![Delta logo]()
$288
This United Airlines deal was found by Cheapflights users on 3/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1010:30 pm
SAN
- ORD
Nonstop4h 05m
United Airlines
Sun 4/127:00 am
ORD
- SAN
Nonstop4h 40m
United Airlines
Deal found 3/14![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:15 am
LAX
- MDW
Nonstop4h 00m
Southwest
Tue 5/56:10 am
MDW
- LAX
2 stops8h 00m
Southwest
Deal found 3/13![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 3/11. 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 5/77:00 am
BUR
- ORD
2 stops11h 14m
Delta
Sun 5/102:00 pm
ORD
- BUR
2 stops9h 45m
Delta
Deal found 3/11![Delta logo]()
$288
This Southwest deal was found by Cheapflights users on 3/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2511:05 am
LAX
- MDW
2 stops8h 15m
Southwest
Wed 4/2910:10 am
MDW
- LAX
Nonstop4h 30m
Southwest
Deal found 3/14![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 3/11. 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 5/127:00 am
BUR
- ORD
2 stops13h 27m
Delta
Tue 5/192:00 pm
ORD
- BUR
2 stops9h 45m
Delta
Deal found 3/11![Delta logo]()
$288
This Alaska Airlines deal was found by Cheapflights users on 3/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:57 pm
LAX
- ORD
1 stop10h 43m
Alaska Airlines
Wed 5/66:00 am
ORD
- LAX
1 stop10h 45m
Alaska Airlines
Deal found 3/13![Alaska Airlines logo]()
$297
This United Airlines deal was found by Cheapflights users on 3/11. 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 4/73:29 pm
SNA
- ORD
1 stop7h 16m
United Airlines
Mon 4/137:54 pm
ORD
- SNA
Nonstop4h 41m
United Airlines
Deal found 3/11![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 3/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2111:55 pm
LAX
- MDW
Nonstop3h 55m
Southwest
Fri 4/249:45 pm
MDW
- LAX
Nonstop4h 25m
Southwest
Deal found 3/12![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 3/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/101:30 pm
SMF
- ORD
1 stop6h 28m
Delta
Sat 6/137:15 am
ORD
- SMF
1 stop7h 07m
Delta
Deal found 3/14![Delta logo]()
$288
This United Airlines deal was found by Cheapflights users on 3/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1811:56 pm
SFO
- ORD
Nonstop4h 24m
United Airlines
Fri 5/2210:45 pm
ORD
- SFO
Nonstop4h 57m
United Airlines
Deal found 3/12![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:55 pm
LAX
- MDW
Nonstop3h 55m
Southwest
Fri 4/179:45 pm
MDW
- LAX
Nonstop4h 25m
Southwest
Deal found 3/13![Southwest logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 3/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/308:14 pm
SMF
- ORD
1 stop8h 25m
Alaska Airlines
Thu 4/24:13 pm
ORD
- SMF
1 stop8h 45m
Alaska Airlines
Deal found 3/13![Alaska Airlines logo]()
$318
This Delta deal was found by Cheapflights users on 3/11. 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 7/177:50 pm
SMF
- ORD
2 stops10h 44m
Delta
Tue 7/211:35 pm
ORD
- SMF
1 stop10h 21m
Delta
Deal found 3/11![Delta logo]()
$313
This Southwest deal was found by Cheapflights users on 3/10. 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 5/1410:30 pm
SAN
- ORD
1 stop9h 15m
Southwest
Mon 5/182:40 pm
ORD
- SAN
1 stop10h 15m
Southwest
Deal found 3/10![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 3/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/113:29 pm
SNA
- ORD
1 stop7h 16m
United Airlines
Sat 4/184:05 pm
ORD
- SNA
Nonstop4h 41m
United Airlines
Deal found 3/12![United Airlines logo]()
$319
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2912:40 pm
SAN
- ORD
Nonstop4h 20m
Alaska Airlines
Sat 8/86:22 am
ORD
- SAN
Nonstop4h 34m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 3/11. 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 6/41:05 pm
SMF
- ORD
1 stop6h 45m
Delta
Mon 6/83:50 pm
ORD
- SMF
2 stops9h 46m
Delta
Deal found 3/11![Delta logo]()
$313
This Southwest deal was found by Cheapflights users on 3/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2811:05 am
LAX
- ORD
2 stops9h 50m
Southwest
Tue 5/57:45 am
ORD
- LAX
1 stop7h 15m
Southwest
Deal found 3/13![Southwest logo]()
$262
Last-minute flights from California to IllinoisDiscover last-minute flight deals from California to Illinois. Data last updated March 15, 2026 and is based on user searches.
Discover last-minute flight deals from California to Illinois. Data last updated March 15, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/109:28 pm
SAN
- ORD
1 stop25h 10m
Frontier
Mon 4/139:06 pm
ORD
- SAN
1 stop18h 11m
Frontier
Deal found 3/11![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/116:25 am
SAN
- ORD
1 stop16h 13m
Frontier
Mon 4/139:06 pm
ORD
- SAN
1 stop18h 11m
Frontier
Deal found 3/11![Frontier logo]()
$178
This eDestinos deal was found by Cheapflights users on 3/13. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:23 pm
SAN
- ORD
1 stop19h 37m
Frontier
Mon 4/207:35 am
ORD
- SAN
1 stop12h 13m
Frontier
Deal found 3/13![Frontier logo]()
$174
This Frontier deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1711:36 pm
LAX
- ORD
Nonstop4h 14m
Frontier
Sun 4/195:25 am
ORD
- LAX
1 stop9h 16m
Frontier
Deal found 3/10![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/1811:42 am
SAN
- ORD
1 stop20h 03m
Frontier
Sat 4/258:55 am
ORD
- SAN
1 stop7h 29m
Frontier
Deal found 3/11![Frontier logo]()
$173
This Frontier deal was found by Cheapflights users on 3/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:36 pm
LAX
- ORD
Nonstop4h 14m
Frontier
Sun 8/29:48 pm
ORD
- LAX
1 stop13h 06m
Frontier
Deal found 3/13![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/187:15 am
SAN
- ORD
1 stop24h 30m
Frontier
Tue 4/218:58 pm
ORD
- SAN
1 stop18h 19m
Frontier
Deal found 3/10![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/206:43 pm
SAN
- ORD
2 stops33h 25m
Frontier
Sun 4/267:50 am
ORD
- SAN
1 stop25h 56m
Frontier
Deal found 3/10![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 4/222:12 pm
SAN
- ORD
1 stop13h 13m
Multiple Airlines
Sat 5/28:55 am
ORD
- SAN
1 stop7h 29m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 4/2310:53 pm
LAX
- ORD
1 stop16h 07m
Multiple Airlines
Mon 4/275:15 am
ORD
- LAX
Nonstop4h 20m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 4/2310:53 pm
LAX
- MDW
1 stop20h 57m
Frontier
Sun 4/266:20 am
MDW
- LAX
1 stop17h 44m
Frontier
Deal found 3/13![Frontier logo]()
$181
This Southwest deal was found by Cheapflights users on 3/10. 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 4/2511:30 am
SAN
- ORD
2 stops9h 55m
Southwest
Sat 5/23:05 pm
ORD
- SAN
2 stops10h 20m
Southwest
Deal found 3/10![Southwest logo]()
$177
One-way flights from California to IllinoisSearch for one-way flight options from California to Illinois. Find affordable one-way fares based on user searches. Data last updated March 15, 2026.
Search for one-way flight options from California to Illinois. Find affordable one-way fares based on user searches. Data last updated March 15, 2026.
This CheapOair deal was found by Cheapflights users on 3/11. 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.
Tue 4/217:00 am
SJC
- ORD
1 stop9h 40m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$86
This CheapOair deal was found by Cheapflights users on 3/11. 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.
Wed 4/157:17 am
SMF
- ORD
1 stop9h 45m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/116:35 am
SAN
- ORD
1 stop15h 24m
Frontier
Deal found 3/10![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Wed 5/1310:50 am
ONT
- ORD
1 stop7h 47m
Frontier
Deal found 3/12![Frontier logo]()
$88
This Southwest deal was found by Cheapflights users on 3/10. 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 4/2211:30 am
SAN
- ORD
2 stops9h 25m
Southwest
Deal found 3/10![Southwest logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 3/12. 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.
Wed 4/157:36 pm
BUR
- ORD
1 stop7h 49m
Spirit Airlines
Deal found 3/12![Spirit Airlines logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/142:12 pm
SAN
- ORD
1 stop13h 56m
Frontier
Deal found 3/10![Frontier logo]()
$90
This Vakatrip deal was found by Cheapflights users on 3/14. 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 Vakatrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2810:21 am
SJC
- ORD
1 stop6h 42m
Alaska Airlines
Deal found 3/14![Alaska Airlines logo]()
$90
This Trip.com deal was found by Cheapflights users on 3/11. 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.
Sun 5/106:25 am
SAN
- ORD
1 stop12h 12m
Frontier
Deal found 3/11![Frontier logo]()
$91
This Trip.com deal was found by Cheapflights users on 3/11. 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.
Sat 4/116:20 am
ONT
- ORD
1 stop16h 18m
Frontier
Deal found 3/11![Frontier logo]()
$91
This CheapOair deal was found by Cheapflights users on 3/11. 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.
Mon 4/138:39 pm
SJC
- ORD
1 stop15h 42m
Alaska Airlines
Deal found 3/11![Alaska Airlines logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Wed 5/136:25 am
SAN
- ORD
1 stop12h 12m
Frontier
Deal found 3/15![Frontier logo]()
$92
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 March 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $173 (Kiwi.com) |
One-way from | $86 (CheapOair) |
Popular in | February |
Cheapest in | September |
Average price | $351 |
Good round-trip deal | $295 or less |
Good one-way deal | $158 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 March 15, 2026.
Use the filters below to find and compare flights from California to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San DiegoChicago
SAN - ORD
SANORD
San Diego
Tue 5/5
10:51 am-11:59 pm
1 stop11h 08m
Chicago O'Hare Intl
Sat 5/9
3:52 pm-6:31 pm
Nonstop4h 39m
$207
San DiegoChicago
SAN - ORD
SANORD
San Diego
Wed 4/22
7:03 am-1:13 pm
Nonstop4h 10m
Chicago O'Hare Intl
Tue 4/28
6:00 am-1:27 pm
1 stop9h 27m
$207
San DiegoChicago
SAN - ORD
SANORD
San Diego
Fri 4/24
5:36 pm-11:43 pm
Nonstop4h 07m
Chicago O'Hare Intl
Tue 4/28
8:50 am-11:30 am
Nonstop4h 40m
$217
San DiegoChicago
SAN - ORD
SANORD
San Diego
Tue 4/14
11:30 am-10:55 pm
2 stops9h 25m
Chicago O'Hare Intl
Sat 4/18
3:05 pm-11:25 pm
2 stops10h 20m
$227
San DiegoChicago
SAN - ORD
SANORD
San Diego
Thu 4/30
10:40 pm-4:45 am
Nonstop4h 05m
Chicago O'Hare Intl
Mon 5/4
7:05 am-9:42 am
Nonstop4h 37m
$237
Los AngelesChicago
LAX - MDW
LAXMDW
Los Angeles Los Angeles
Sat 4/18
5:40 am-11:40 am
Nonstop4h 00m
Chicago Midway
Sat 4/25
6:00 pm-8:25 pm
Nonstop4h 25m
$237
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Sat 5/23
11:25 pm-5:40 am
Nonstop4h 15m
Chicago Midway
Wed 5/27
9:00 pm-11:35 pm
Nonstop4h 35m
$252
Los AngelesChicago
LAX - MDW
LAXMDW
Los Angeles Los Angeles
Tue 4/28
5:15 am-11:15 am
Nonstop4h 00m
Chicago Midway
Tue 5/5
6:10 am-12:10 pm
2 stops8h 00m
$252
Los AngelesChicago
LAX - MDW
LAXMDW
Los Angeles Los Angeles
Sat 4/25
11:05 am-9:20 pm
2 stops8h 15m
Chicago Midway
Wed 4/29
10:10 am-12:40 pm
Nonstop4h 30m
$252
Quickest round-trip
Los AngelesChicago
LAX - MDW
LAXMDW
Los Angeles Los Angeles
Tue 4/21
11:55 pm-5:50 am
Nonstop3h 55m
Chicago Midway
Fri 4/24
9:45 pm-12:10 am
Nonstop4h 25m
$257
Showing 1-10 of 60 resultsSorted by cheapest first
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.
SAN-ORD
LAX-ORD
LAX-MDW
SMF-ORD
SFO-MDW
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
USCA-USIL
SAN-ORD
LAX-ORD
LAX-MDW
SMF-ORD
What is the cheapest month to book a flight from California to Illinois?
Currently, April is the cheapest month in which you can book a flight from California to Illinois (average of $97). Flying from California to Illinois in March is currently the most expensive (average of $163). 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 March 15, 2026.
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 March 12, 2026.
Travelers seeking maximum savings on their California to Illinois flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from California to Illinois
Explore weekly flight availability from California to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 15, 2026.
The most flights from USCA to USIL are scheduled on a Friday (110 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (69 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 March 15, 2026.
See what other customers who have flown with Southwest,United Airlines, andAmerican 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.
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
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.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from California to Illinois by cabin class
Find flights from California to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
California and Illinois flights
Browse other California and Illinois flight options. Last updated on March 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to California after your stay in Illinois
California to Illinois flights
Consider these flights traveling from California to Illinois.
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 March 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$89 | Average$241 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$212 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$101 | Average$227 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$128 | Average$348 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$133 | Average$450 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$140 | Average$372 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$157 | Average$482 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$166 | Average$288 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$179 | Average$408 | FlexibilityNo cancel fee | On-time63% |