$159+ Cheap flights from San Francisco (SFO) 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Jul 22 — Jul 291
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Illinois with Cheapflights
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Cheapest flights from San Francisco to IllinoisExplore the most affordable flight options available from San Francisco to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 22, 2026.
Explore the most affordable flight options available from San Francisco to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 8/512:54 am
SFO
- ORD
1 stop13h 06m
Frontier
Mon 8/107:15 am
ORD
- SFO
1 stop29h 10m
Frontier
Deal found 6/17![Frontier logo]()
$314
This Alaska Airlines deal was found by Cheapflights users on 6/21. 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 9/288:25 am
SFO
- ORD
1 stop8h 56m
Alaska Airlines
Tue 9/297:20 am
ORD
- SFO
1 stop7h 40m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$315
This Frontier deal was found by Cheapflights users on 6/21. 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 7/1111:00 pm
SFO
- MDW
1 stop10h 07m
Frontier
Wed 7/1512:11 pm
MDW
- SFO
1 stop9h 07m
Frontier
Deal found 6/21![Frontier logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/317:08 pm
SFO
- RFD
1 stop15h 00m
Multiple Airlines
Mon 8/39:13 pm
RFD
- SFO
2 stops24h 39m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$316
This Frontier deal was found by Cheapflights users on 6/21. 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.
Tue 6/3012:38 pm
SFO
- ORD
1 stop6h 05m
Frontier
Tue 7/147:15 am
ORD
- SFO
1 stop10h 10m
Frontier
Deal found 6/21![Frontier logo]()
$316
This CheapOair deal was found by Cheapflights users on 6/21. 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 8/2510:35 pm
SFO
- MDW
1 stop10h 20m
Frontier
Fri 8/286:05 am
MDW
- SFO
1 stop14h 58m
Frontier
Deal found 6/21![Frontier logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 8/268:56 pm
SFO
- ORD
1 stop20h 06m
Frontier
Sun 8/308:11 pm
ORD
- SFO
1 stop14h 32m
Frontier
Deal found 6/20![Frontier logo]()
$317
This Cheapflightsfares deal was found by Cheapflights users on 6/20. 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 6/2412:32 am
SFO
- ORD
1 stop9h 04m
Frontier
Mon 7/139:57 pm
ORD
- SFO
1 stop15h 46m
Frontier
Deal found 6/20![Frontier logo]()
$318
This Frontier deal was found by Cheapflights users on 6/18. 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 7/310:10 pm
SFO
- MDW
1 stop10h 54m
Frontier
Sat 7/116:05 am
MDW
- SFO
1 stop15h 13m
Frontier
Deal found 6/18![Frontier logo]()
$319
This Frontier deal was found by Cheapflights users on 6/18. 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 7/412:38 pm
SFO
- ORD
1 stop6h 05m
Frontier
Sat 7/117:05 am
ORD
- SFO
1 stop14h 13m
Frontier
Deal found 6/18![Frontier logo]()
$319
This Trip.com deal was found by Cheapflights users on 6/21. 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 7/1410:10 pm
SFO
- MDW
1 stop10h 57m
Frontier
Sat 7/1812:11 pm
MDW
- SFO
1 stop9h 07m
Frontier
Deal found 6/21![Frontier logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 6/308:45 pm
SFO
- ORD
1 stop6h 22m
Frontier
Mon 7/139:57 pm
ORD
- SFO
1 stop15h 46m
Frontier
Deal found 6/21![Frontier logo]()
$320
Best flights from San Francisco to IllinoisDiscover carefully curated flight deals from San Francisco to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 22, 2026.
Discover carefully curated flight deals from San Francisco to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/317:08 pm
SFO
- RFD
1 stop15h 00m
Multiple Airlines
Wed 8/58:58 pm
RFD
- SFO
2 stops19h 55m
Multiple Airlines
Deal found 6/19![Multiple Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 6/21. 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 8/156:38 pm
SFO
- ORD
Nonstop4h 21m
United Airlines
Wed 8/1912:51 pm
ORD
- SFO
Nonstop4h 44m
United Airlines
Deal found 6/21![United Airlines logo]()
$329
This American Airlines deal was found by Cheapflights users on 6/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2211:07 pm
SFO
- PIA
1 stop8h 10m
American Airlines
Wed 7/294:43 pm
PIA
- SFO
1 stop10h 00m
American Airlines
Deal found 6/21![American Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 6/21. 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 8/56:50 am
SFO
- MDW
1 stop6h 15m
Southwest
Wed 8/1210:25 am
MDW
- SFO
Nonstop4h 30m
Southwest
Deal found 6/21![Southwest logo]()
$339
This Delta deal was found by Cheapflights users on 6/18. 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 9/136:00 am
SFO
- BMI
1 stop7h 15m
Delta
Mon 9/284:23 pm
BMI
- SFO
1 stop9h 34m
Delta
Deal found 6/18![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 6/20. 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.
Sat 10/106:00 am
SFO
- ORD
1 stop10h 20m
Alaska Airlines
Sat 10/107:49 pm
ORD
- SFO
1 stop15h 48m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$390
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 9/179:27 pm
SFO
- RFD
1 stop18h 44m
Multiple Airlines
Sun 9/209:29 pm
RFD
- SFO
1 stop12h 54m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$330
This American Airlines deal was found by Cheapflights users on 6/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/111:07 pm
SFO
- PIA
1 stop8h 10m
American Airlines
Sat 8/84:43 pm
PIA
- SFO
1 stop7h 35m
American Airlines
Deal found 6/21![American Airlines logo]()
$331
This United Airlines deal was found by Cheapflights users on 6/21. 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 9/166:00 am
SFO
- ORD
Nonstop4h 29m
United Airlines
Mon 9/2110:00 pm
ORD
- SFO
Nonstop4h 50m
United Airlines
Deal found 6/21![United Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 6/18. 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 9/136:00 am
SFO
- BMI
1 stop7h 15m
Delta
Fri 10/212:08 pm
BMI
- SFO
1 stop9h 41m
Delta
Deal found 6/18![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 6/22. 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 7/215:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Sat 7/258:50 pm
MDW
- SFO
Nonstop4h 45m
Southwest
Deal found 6/22![Southwest logo]()
$350
This United Airlines deal was found by Cheapflights users on 6/17. 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 10/612:05 pm
SFO
- ORD
Nonstop4h 32m
United Airlines
Thu 10/87:44 am
ORD
- SFO
Nonstop4h 46m
United Airlines
Deal found 6/17![United Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 9/139:27 pm
SFO
- RFD
1 stop20h 27m
Multiple Airlines
Thu 9/179:29 pm
RFD
- SFO
1 stop12h 54m
Multiple Airlines
Deal found 6/22![Multiple Airlines logo]()
$348
This Southwest deal was found by Cheapflights users on 6/19. 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 7/1511:40 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Mon 7/205:45 am
MDW
- SFO
1 stop7h 15m
Southwest
Deal found 6/19![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 6/17. 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 9/2512:30 am
SFO
- ORD
1 stop6h 08m
Delta
Sat 9/263:42 pm
ORD
- SFO
1 stop10h 15m
Delta
Deal found 6/17![Delta logo]()
$355
This United Airlines deal was found by Cheapflights users on 6/19. 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 9/97:05 am
SFO
- PAH
1 stop10h 05m
United Airlines
Tue 9/155:00 am
PAH
- SFO
1 stop7h 26m
United Airlines
Deal found 6/19![United Airlines logo]()
$338
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 8/2711:00 am
SFO
- RFD
1 stop7h 45m
Multiple Airlines
Sun 8/309:35 pm
RFD
- SFO
1 stop13h 08m
Multiple Airlines
Deal found 6/19![Multiple Airlines logo]()
$355
This Delta deal was found by Cheapflights users on 6/17. 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 8/610:59 pm
SFO
- ORD
1 stop6h 57m
Delta
Sat 8/153:00 pm
ORD
- SFO
1 stop8h 02m
Delta
Deal found 6/17![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 6/17. 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 7/85:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Wed 7/85:35 pm
MDW
- SFO
1 stop7h 55m
Southwest
Deal found 6/17![Southwest logo]()
$363
This Delta deal was found by Cheapflights users on 6/20. 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 8/2012:12 am
SFO
- MDW
1 stop6h 27m
Delta
Mon 8/247:25 pm
MDW
- SFO
1 stop6h 22m
Delta
Deal found 6/20![Delta logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 6/19. 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 8/116:00 am
SFO
- STL
2 stops10h 05m
Alaska Airlines
Wed 8/198:36 am
STL
- SFO
2 stops10h 46m
Alaska Airlines
Deal found 6/19![Alaska Airlines logo]()
$487
This United Airlines deal was found by Cheapflights users on 6/19. 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 10/73:00 pm
SFO
- ORD
Nonstop4h 20m
United Airlines
Sun 10/116:07 am
ORD
- SFO
Nonstop4h 38m
United Airlines
Deal found 6/19![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 6/19. 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 7/111:30 pm
SFO
- MDW
1 stop7h 45m
Southwest
Wed 7/155:50 pm
MDW
- SFO
2 stops7h 30m
Southwest
Deal found 6/19![Southwest logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 9/37:04 pm
SFO
- RFD
1 stop14h 15m
Multiple Airlines
Wed 9/92:09 pm
RFD
- SFO
1 stop20h 33m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$370
This American Airlines deal was found by Cheapflights users on 6/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/137:25 am
SFO
- BMI
1 stop6h 54m
American Airlines
Sat 8/154:49 pm
BMI
- SFO
1 stop8h 21m
American Airlines
Deal found 6/17![American Airlines logo]()
$469
This Delta deal was found by Cheapflights users on 6/20. 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 11/211:05 pm
SFO
- ORD
1 stop8h 41m
Delta
Fri 11/277:35 am
ORD
- SFO
1 stop9h 33m
Delta
Deal found 6/20![Delta logo]()
$364
This United Airlines deal was found by Cheapflights users on 6/17. 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 7/182:29 pm
SFO
- ORD
Nonstop4h 34m
United Airlines
Sat 7/259:35 pm
ORD
- SFO
Nonstop4h 57m
United Airlines
Deal found 6/17![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 6/17. 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 7/225:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Fri 7/249:30 pm
MDW
- SFO
Nonstop4h 45m
Southwest
Deal found 6/17![Southwest logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 6/19. 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 8/176:00 am
SFO
- STL
2 stops12h 26m
Alaska Airlines
Sat 8/226:00 am
STL
- SFO
1 stop6h 59m
Alaska Airlines
Deal found 6/19![Alaska Airlines logo]()
$497
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/317:08 pm
SFO
- RFD
1 stop15h 00m
Multiple Airlines
Mon 8/39:13 pm
RFD
- SFO
1 stop20h 58m
Multiple Airlines
Deal found 6/22![Multiple Airlines logo]()
$375
Last-minute flights from San Francisco to IllinoisDiscover last-minute flight deals from San Francisco to Illinois. Data last updated June 22, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Illinois. Data last updated June 22, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 6/20. 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 6/2412:32 am
SFO
- ORD
1 stop9h 04m
Frontier
Mon 7/139:57 pm
ORD
- SFO
1 stop15h 46m
Frontier
Deal found 6/20![Frontier logo]()
$318
This Frontier deal was found by Cheapflights users on 6/21. 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 6/2510:10 pm
SFO
- MDW
1 stop10h 59m
Frontier
Mon 7/136:05 am
MDW
- SFO
1 stop15h 13m
Frontier
Deal found 6/21![Frontier logo]()
$321
This Frontier deal was found by Cheapflights users on 6/21. 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.
Tue 6/3012:38 pm
SFO
- ORD
1 stop6h 05m
Frontier
Tue 7/147:15 am
ORD
- SFO
1 stop10h 10m
Frontier
Deal found 6/21![Frontier logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 6/308:45 pm
SFO
- ORD
1 stop6h 22m
Frontier
Mon 7/139:57 pm
ORD
- SFO
1 stop15h 46m
Frontier
Deal found 6/21![Frontier logo]()
$320
This Frontier deal was found by Cheapflights users on 6/18. 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 7/36:00 am
SFO
- ORD
1 stop12h 43m
Frontier
Sat 7/117:05 am
ORD
- SFO
1 stop14h 13m
Frontier
Deal found 6/18![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/48:21 pm
SFO
- ORD
1 stop7h 58m
Frontier
Mon 7/139:57 pm
ORD
- SFO
1 stop15h 46m
Frontier
Deal found 6/21![Frontier logo]()
$317
This Frontier deal was found by Cheapflights users on 6/18. 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 7/611:00 pm
SFO
- MDW
1 stop10h 07m
Frontier
Fri 7/106:05 am
MDW
- SFO
1 stop15h 13m
Frontier
Deal found 6/18![Frontier logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/99:00 pm
SFO
- ORD
1 stop6h 37m
Frontier
Thu 7/167:05 am
ORD
- SFO
1 stop14h 13m
Frontier
Deal found 6/21![Frontier logo]()
$315
This Frontier deal was found by Cheapflights users on 6/21. 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 7/1111:00 pm
SFO
- MDW
1 stop10h 07m
Frontier
Wed 7/1512:11 pm
MDW
- SFO
1 stop9h 07m
Frontier
Deal found 6/21![Frontier logo]()
$316
This Trip.com deal was found by Cheapflights users on 6/21. 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 7/1410:10 pm
SFO
- MDW
1 stop10h 57m
Frontier
Sat 7/1812:11 pm
MDW
- SFO
1 stop9h 07m
Frontier
Deal found 6/21![Frontier logo]()
$320
This CheapOair deal was found by Cheapflights users on 6/21. 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 7/2110:10 pm
SFO
- MDW
1 stop10h 57m
Frontier
Fri 8/76:05 am
MDW
- SFO
1 stop15h 08m
Frontier
Deal found 6/21![Frontier logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/317:08 pm
SFO
- RFD
1 stop15h 00m
Multiple Airlines
Mon 8/39:13 pm
RFD
- SFO
2 stops24h 39m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$316
One-way flights from San Francisco to IllinoisSearch for one-way flight options from San Francisco to Illinois. Find affordable one-way fares based on user searches. Data last updated June 22, 2026.
Search for one-way flight options from San Francisco to Illinois. Find affordable one-way fares based on user searches. Data last updated June 22, 2026.
This Booking.com deal was found by Cheapflights users on 6/21. 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.
Tue 7/2812:29 am
SFO
- MDW
1 stop13h 21m
Frontier
Deal found 6/21![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 9/106:30 am
SFO
- RFD
1 stop12h 09m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/84:30 pm
SFO
- ORD
1 stop11h 07m
Frontier
Deal found 6/18![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 7/109:00 pm
SFO
- ORD
1 stop6h 37m
Frontier
Deal found 6/19![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/147:04 pm
SFO
- RFD
1 stop22h 55m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$161
This Booking.com deal was found by Cheapflights users on 6/20. 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.
Sun 7/129:39 pm
SFO
- ORD
1 stop21h 13m
Frontier
Deal found 6/20![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 9/197:30 pm
SFO
- MDW
2 stops13h 28m
Frontier
Deal found 6/21![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/2810:23 pm
SFO
- ORD
2 stops29h 14m
Frontier
Deal found 6/21![Frontier logo]()
$162
This CheapOair deal was found by Cheapflights users on 6/21. 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 7/237:20 am
SFO
- ORD
1 stop19h 40m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 7/217:04 pm
SFO
- RFD
1 stop22h 55m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 8/1110:23 pm
SFO
- ORD
2 stops29h 14m
Frontier
Deal found 6/21![Frontier logo]()
$164
This Southwest deal was found by Cheapflights users on 6/22. 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 7/215:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 6/22![Southwest logo]()
$165
Find flight deals from San Francisco to Illinois
Keep the following information in mind while searching for San Francisco to Illinois flight deals. Data was last updated June 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $314 (Kiwi.com) |
One-way from | $159 (Booking.com) |
Popular in | May |
Cheapest in | September |
Average price | $457 |
Good round-trip deal | $403 or less |
Good one-way deal | $223 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco 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 June 22, 2026.
Use the filters below to find and compare flights from San Francisco to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Fri 7/31
7:08 pm-12:08 pm
1 stop15h 00m
Chicago Greater Rockford
Wed 8/5
8:58 pm-2:53 pm
2 stops19h 55m
$329
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 8/15
6:38 pm-12:59 am
Nonstop4h 21m
Chicago O'Hare Intl
Wed 8/19
12:51 pm-3:35 pm
Nonstop4h 44m
$329
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Thu 9/17
9:27 pm-6:11 pm
1 stop18h 44m
Chicago Greater Rockford
Sun 9/20
9:29 pm-8:23 am
1 stop12h 54m
$330
San FranciscoPeoria
SFO - PIA
SFOPIA
San Francisco
Wed 7/22
11:07 pm-9:17 am
1 stop8h 10m
Greater Peoria
Wed 7/29
4:43 pm-12:43 am
1 stop10h 00m
$331
San FranciscoPeoria
SFO - PIA
SFOPIA
San Francisco
Sat 8/1
11:07 pm-9:17 am
1 stop8h 10m
Greater Peoria
Sat 8/8
4:43 pm-10:18 pm
1 stop7h 35m
$331
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Wed 9/16
6:00 am-12:29 pm
Nonstop4h 29m
Chicago O'Hare Intl
Mon 9/21
10:00 pm-12:50 am
Nonstop4h 50m
$332
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Tue 10/6
12:05 pm-6:37 pm
Nonstop4h 32m
Chicago O'Hare Intl
Thu 10/8
7:44 am-10:30 am
Nonstop4h 46m
$335
San FranciscoPaducah
SFO - PAH
SFOPAH
San Francisco
Wed 9/9
7:05 am-7:10 pm
1 stop10h 05m
Paducah Barkley Regional
Tue 9/15
5:00 am-10:26 am
1 stop7h 26m
$338
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Wed 8/5
6:50 am-3:05 pm
1 stop6h 15m
Chicago Midway
Wed 8/12
10:25 am-12:55 pm
Nonstop4h 30m
$339
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Sun 9/13
9:27 pm-7:54 pm
1 stop20h 27m
Chicago Greater Rockford
Thu 9/17
9:29 pm-8:23 am
1 stop12h 54m
$348
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Francisco to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Francisco with our price prediction graph.
SFO-MDW
SFO-ORD
SFO-RFD
SFO-MLI
SFO-STL
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 San Francisco to Illinois
SFO-USIL
SFO-MDW
SFO-ORD
SFO-RFD
SFO-MLI
What is the cheapest month to book a flight from San Francisco to Illinois?
Currently, September is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $294). Flying from San Francisco to Illinois in January is currently the most expensive (average of $1,050). 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 SFO to IL?
Find hourly flight availability from San Francisco 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 June 22, 2026.
It’s optimal to fly from San Francisco to Illinois in the evening. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from San Francisco to Illinois
Explore weekly flight availability from San Francisco 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 June 22, 2026.
The most flights from SFO to USIL are scheduled on a Monday (88 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (39 on average).
How much does it cost to fly round-trip from San Francisco to Illinois?
How far ahead should I book a flight from San Francisco to Illinois?
Booking 66 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from San Francisco to Illinois?
Use this chart to determine the cheapest time to fly round-trip from San Francisco to Illinois. Price data was last updated on June 20, 2026.
Travelers seeking maximum savings on their San Francisco to Illinois flight should consider departing on Monday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 June 22, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andUnited Airlines from San Francisco to Illinois by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Related info for your journey
Find useful and relevant information for your journey from San Francisco to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for San Francisco 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 San Francisco to Illinois by cabin class
Find flights from San Francisco to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Francisco and Illinois flights
Browse other San Francisco and Illinois flight options. Last updated on June 22, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Francisco to Illinois flights
Consider these flights traveling from San Francisco to Illinois.
Top 8 airlines flying from San Francisco to Illinois
Discover the top 8 airlines that operate flights from San Francisco 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 June 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$108 | Average$222 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$122 | Average$387 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$130 | Average$271 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$144 | Average$368 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$197 | Average$382 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$207 | Average$503 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$208 | Average$521 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$225 | Average$324 | FlexibilityNo cancel fee | On-time62% |