$106+ Cheap flights from Illinois to San Francisco (SFO)
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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Aug 19 — Aug 261
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to San Francisco with Cheapflights
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Cheapest flights from Illinois to San FranciscoExplore the most affordable flight options available from Illinois to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 20, 2026.
Explore the most affordable flight options available from Illinois to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 20, 2026.
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:10 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Sat 8/2211:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 7/15![Southwest logo]()
$277
This Cheapflightsfares deal was found by Cheapflights users on 7/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:57 pm
ORD
- SFO
1 stop28h 21m
Frontier
Sat 8/1511:20 am
SFO
- ORD
1 stop16h 17m
Frontier
Deal found 7/18![Frontier logo]()
$277
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:55 am
MDW
- SFO
2 stops9h 55m
Southwest
Mon 9/710:30 pm
SFO
- MDW
1 stop8h 30m
Southwest
Deal found 7/15![Southwest logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 10/161:02 pm
ORD
- SFO
1 stop12h 49m
Frontier
Mon 10/199:18 am
SFO
- ORD
2 stops22h 43m
Frontier
Deal found 7/16![Frontier logo]()
$278
This Southwest deal was found by Cheapflights users on 7/19. 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 9/211:00 am
MDW
- SFO
1 stop9h 15m
Southwest
Wed 9/911:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 7/19![Southwest logo]()
$279
This Cheapflightsfares deal was found by Cheapflights users on 7/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/167:29 am
ORD
- SFO
1 stop27h 14m
Frontier
Thu 8/208:56 pm
SFO
- ORD
1 stop20h 06m
Frontier
Deal found 7/19![Frontier logo]()
$279
This Frontier deal was found by Cheapflights users on 7/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:50 am
MDW
- SFO
1 stop9h 13m
Frontier
Sun 8/3010:35 pm
SFO
- MDW
1 stop10h 20m
Frontier
Deal found 7/20![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 7/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:05 am
ORD
- SFO
1 stop13h 58m
Frontier
Sun 8/2310:01 am
SFO
- ORD
1 stop8h 14m
Frontier
Deal found 7/19![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 7/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 am
MDW
- SFO
1 stop15h 08m
Frontier
Thu 8/2010:01 am
SFO
- MDW
1 stop8h 30m
Frontier
Deal found 7/20![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/192:41 pm
ORD
- SFO
1 stop11h 37m
Multiple Airlines
Mon 8/243:25 pm
SFO
- ORD
1 stop6h 34m
Multiple Airlines
Deal found 7/20![Multiple Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 8/187:15 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Sat 8/2211:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 7/16![Southwest logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 8/192:41 pm
ORD
- SFO
2 stops21h 34m
Frontier
Sun 8/238:23 pm
SFO
- ORD
1 stop7h 36m
Frontier
Deal found 7/15![Frontier logo]()
$282
Best flights from Illinois to San FranciscoDiscover carefully curated flight deals from Illinois to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 20, 2026.
Discover carefully curated flight deals from Illinois to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 20, 2026.
This Southwest deal was found by Cheapflights users on 7/19. 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 10/107:05 pm
MDW
- SFO
Nonstop4h 40m
Southwest
Tue 10/1312:15 pm
SFO
- MDW
1 stop7h 55m
Southwest
Deal found 7/19![Southwest logo]()
$279
This Delta deal was found by Cheapflights users on 7/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:59 pm
ORD
- SFO
1 stop6h 58m
Delta
Thu 12/311:00 pm
SFO
- ORD
1 stop8h 33m
Delta
Deal found 7/19![Delta logo]()
$289
This United Airlines deal was found by Cheapflights users on 7/17. 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.
Mon 10/269:40 pm
ORD
- SFO
Nonstop4h 56m
United Airlines
Wed 10/286:40 pm
SFO
- ORD
Nonstop4h 17m
United Airlines
Deal found 7/17![United Airlines logo]()
$292
This American Airlines deal was found by Cheapflights users on 7/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:48 pm
PIA
- SFO
1 stop6h 57m
American Airlines
Thu 9/105:30 am
SFO
- PIA
1 stop8h 27m
American Airlines
Deal found 7/18![American Airlines logo]()
$331
This Alaska Airlines deal was found by Cheapflights users on 7/19. 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.
Sat 8/152:50 pm
STL
- SFO
1 stop7h 58m
Alaska Airlines
Wed 8/199:13 pm
SFO
- STL
2 stops17h 57m
Alaska Airlines
Deal found 7/19![Alaska Airlines logo]()
$386
This Southwest deal was found by Cheapflights users on 7/17. 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.
Mon 8/314:25 pm
MDW
- SFO
1 stop8h 25m
Southwest
Mon 9/75:35 am
SFO
- MDW
Nonstop4h 05m
Southwest
Deal found 7/17![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 8/66:10 am
ORD
- SFO
Nonstop4h 37m
United Airlines
Sat 8/84:21 pm
SFO
- ORD
Nonstop4h 38m
United Airlines
Deal found 7/16![United Airlines logo]()
$311
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:10 pm
MDW
- SFO
2 stops8h 00m
Southwest
Wed 8/196:35 am
SFO
- MDW
2 stops7h 25m
Southwest
Deal found 7/15![Southwest logo]()
$283
This American Airlines deal was found by Cheapflights users on 7/17. 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.
Fri 8/146:48 pm
PIA
- SFO
1 stop6h 57m
American Airlines
Tue 8/182:08 pm
SFO
- PIA
1 stop7h 11m
American Airlines
Deal found 7/17![American Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/265:16 pm
MLI
- SFO
1 stop8h 41m
Delta
Thu 10/111:35 pm
SFO
- MLI
1 stop8h 48m
Delta
Deal found 7/15![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 7/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:00 pm
ORD
- SFO
Nonstop4h 50m
United Airlines
Sun 9/206:38 pm
SFO
- ORD
Nonstop4h 21m
United Airlines
Deal found 7/15![United Airlines logo]()
$322
This Southwest deal was found by Cheapflights users on 7/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2311:10 am
MDW
- SFO
2 stops8h 10m
Southwest
Mon 9/2810:30 pm
SFO
- MDW
1 stop8h 30m
Southwest
Deal found 7/18![Southwest logo]()
$294
This Delta deal was found by Cheapflights users on 7/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/282:32 pm
STL
- SFO
2 stops11h 18m
Delta
Wed 9/28:59 pm
SFO
- STL
2 stops9h 38m
Delta
Deal found 7/19![Delta logo]()
$348
This American Airlines deal was found by Cheapflights users on 7/17. 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.
Wed 8/125:00 am
BMI
- SFO
1 stop8h 26m
American Airlines
Tue 8/182:08 pm
SFO
- BMI
1 stop6h 45m
American Airlines
Deal found 7/17![American Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 7/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:05 pm
MDW
- SFO
1 stop8h 05m
Southwest
Tue 8/255:40 am
SFO
- MDW
2 stops9h 30m
Southwest
Deal found 7/18![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 7/19. 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 8/198:45 am
PIA
- SFO
1 stop6h 22m
United Airlines
Wed 8/2611:30 pm
SFO
- PIA
1 stop8h 36m
United Airlines
Deal found 7/19![United Airlines logo]()
$331
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:16 pm
MLI
- SFO
1 stop8h 41m
Delta
Fri 10/210:00 pm
SFO
- MLI
1 stop10h 23m
Delta
Deal found 7/15![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 10/128:25 pm
MDW
- SFO
1 stop6h 15m
Southwest
Thu 10/154:00 pm
SFO
- MDW
1 stop6h 30m
Southwest
Deal found 7/16![Southwest logo]()
$297
This United Airlines deal was found by Cheapflights users on 7/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/159:49 am
CMI
- SFO
1 stop8h 26m
United Airlines
Mon 1/1810:45 pm
SFO
- CMI
1 stop8h 09m
United Airlines
Deal found 7/18![United Airlines logo]()
$338
This Alaska Airlines deal was found by Cheapflights users on 7/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:00 am
ORD
- SFO
2 stops10h 52m
Alaska Airlines
Sat 9/511:12 am
SFO
- ORD
2 stops10h 47m
Alaska Airlines
Deal found 7/15![Alaska Airlines logo]()
$450
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 11/207:58 pm
BMI
- SFO
1 stop21h 36m
Multiple Airlines
Sat 11/2812:40 am
SFO
- BMI
2 stops29h 07m
Multiple Airlines
Deal found 7/19![Multiple Airlines logo]()
$918
This Delta deal was found by Cheapflights users on 7/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:10 pm
MLI
- SFO
1 stop9h 05m
Delta
Mon 11/211:45 pm
SFO
- MLI
1 stop8h 36m
Delta
Deal found 7/19![Delta logo]()
$349
This American Airlines deal was found by Cheapflights users on 7/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:43 pm
PIA
- SFO
1 stop7h 35m
American Airlines
Fri 8/142:08 pm
SFO
- PIA
1 stop7h 11m
American Airlines
Deal found 7/15![American Airlines logo]()
$392
This United Airlines deal was found by Cheapflights users on 7/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:20 pm
DEC
- SFO
1 stop7h 30m
United Airlines
Sun 8/2310:35 pm
SFO
- DEC
1 stop7h 02m
United Airlines
Deal found 7/20![United Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:05 pm
MDW
- SFO
1 stop7h 30m
Southwest
Mon 8/107:55 pm
SFO
- MDW
1 stop7h 45m
Southwest
Deal found 7/15![Southwest logo]()
$315
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:16 pm
MLI
- SFO
1 stop8h 41m
Delta
Mon 9/2810:00 pm
SFO
- MLI
1 stop10h 23m
Delta
Deal found 7/15![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 7/20. 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.
Wed 8/1210:16 am
STL
- SFO
2 stops12h 26m
Alaska Airlines
Mon 8/176:00 am
SFO
- STL
2 stops12h 26m
Alaska Airlines
Deal found 7/20![Alaska Airlines logo]()
$473
This American Airlines deal was found by Cheapflights users on 7/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:32 am
MLI
- SFO
2 stops9h 33m
American Airlines
Sat 8/296:36 am
SFO
- MLI
1 stop7h 26m
American Airlines
Deal found 7/19![American Airlines logo]()
$412
This United Airlines deal was found by Cheapflights users on 7/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/45:45 am
PIA
- SFO
1 stop7h 35m
United Airlines
Sun 9/612:35 am
SFO
- PIA
1 stop7h 31m
United Airlines
Deal found 7/15![United Airlines logo]()
$349
This KAYAK deal was found by Cheapflights users on 7/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/157:07 am
ORD
- SFO
1 stop8h 18m
Delta
Thu 9/172:15 pm
SFO
- ORD
1 stop7h 42m
Delta
Deal found 7/15![Delta logo]()
$351
Last-minute flights from Illinois to San FranciscoDiscover last-minute flight deals from Illinois to San Francisco. Data last updated July 20, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco. Data last updated July 20, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 7/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:57 pm
ORD
- SFO
1 stop28h 21m
Frontier
Sat 8/1511:20 am
SFO
- ORD
1 stop16h 17m
Frontier
Deal found 7/18![Frontier logo]()
$277
This American Airlines deal was found by Cheapflights users on 7/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:05 pm
ORD
- SFO
Nonstop4h 40m
American Airlines
Wed 8/195:07 pm
SFO
- ORD
Nonstop4h 23m
American Airlines
Deal found 7/15![American Airlines logo]()
$278
This Southwest deal was found by Cheapflights users on 7/17. 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.
Thu 8/139:10 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Tue 8/181:25 pm
SFO
- MDW
1 stop7h 25m
Southwest
Deal found 7/17![Southwest logo]()
$279
This Cheapflightsfares deal was found by Cheapflights users on 7/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/167:29 am
ORD
- SFO
1 stop27h 14m
Frontier
Thu 8/208:56 pm
SFO
- ORD
1 stop20h 06m
Frontier
Deal found 7/19![Frontier logo]()
$279
This Frontier deal was found by Cheapflights users on 7/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 am
MDW
- SFO
1 stop15h 08m
Frontier
Thu 8/2010:01 am
SFO
- MDW
1 stop8h 30m
Frontier
Deal found 7/20![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:10 pm
MDW
- SFO
2 stops8h 00m
Southwest
Thu 8/203:20 pm
SFO
- MDW
1 stop6h 25m
Southwest
Deal found 7/15![Southwest logo]()
$278
This Southwest deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 8/187:15 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Sat 8/2211:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 7/16![Southwest logo]()
$282
This Frontier deal was found by Cheapflights users on 7/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:05 am
ORD
- SFO
1 stop13h 58m
Frontier
Sat 8/228:23 pm
SFO
- ORD
1 stop7h 36m
Frontier
Deal found 7/19![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 8/192:41 pm
ORD
- SFO
2 stops21h 34m
Frontier
Sun 8/238:23 pm
SFO
- ORD
1 stop7h 36m
Frontier
Deal found 7/15![Frontier logo]()
$282
This Southwest deal was found by Cheapflights users on 7/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:10 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Sat 8/2211:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 7/15![Southwest logo]()
$277
This Frontier deal was found by Cheapflights users on 7/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:50 am
MDW
- SFO
1 stop9h 13m
Frontier
Sun 8/2310:01 am
SFO
- MDW
1 stop8h 30m
Frontier
Deal found 7/20![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 7/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:05 am
ORD
- SFO
1 stop13h 58m
Frontier
Sun 8/2310:01 am
SFO
- ORD
1 stop8h 14m
Frontier
Deal found 7/19![Frontier logo]()
$280
One-way flights from Illinois to San FranciscoSearch for one-way flight options from Illinois to San Francisco. Find affordable one-way fares based on user searches. Data last updated July 20, 2026.
Search for one-way flight options from Illinois to San Francisco. Find affordable one-way fares based on user searches. Data last updated July 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Fri 8/1412:45 pm
PIA
- SFO
1 stop21h 58m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 10/138:10 pm
STL
- SFO
2 stops27h 08m
Frontier
Deal found 7/16![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/15. 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.
Mon 8/178:08 pm
STL
- SFO
2 stops50h 32m
Frontier
Deal found 7/15![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 7/15. 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.
Mon 9/148:10 pm
STL
- SFO
2 stops27h 08m
Frontier
Deal found 7/15![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 7/15. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:27 pm
STL
- SFO
1 stop7h 27m
Frontier
Deal found 7/15![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” 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 8/277:58 pm
STL
- SFO
1 stop6h 20m
Frontier
Deal found 7/16![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 7/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:08 pm
STL
- SFO
1 stop6h 10m
Frontier
Deal found 7/15![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 7/18. 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.
Mon 8/178:46 am
EVV
- SFO
2 stops37h 10m
Multiple Airlines
Deal found 7/18![Multiple Airlines logo]()
$130
This Super.com deal was found by Cheapflights users on 7/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/153:41 pm
STL
- SFO
1 stop9h 13m
Frontier
Deal found 7/19![Frontier logo]()
$130
This iWofly deal was found by Cheapflights users on 7/19. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:35 am
STL
- SFO
1 stop9h 45m
Frontier
Deal found 7/19![Frontier logo]()
$131
This Frontier deal was found by Cheapflights users on 7/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:10 pm
STL
- SFO
1 stop6h 05m
Frontier
Deal found 7/20![Frontier logo]()
$132
This Trip.com deal was found by Cheapflights users on 7/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:08 pm
STL
- SFO
1 stop6h 10m
Frontier
Deal found 7/15![Frontier logo]()
$133
Find flight deals from Illinois to San Francisco
Keep the following information in mind while searching for Illinois to San Francisco flight deals. Data was last updated July 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $277 (Southwest) |
One-way from | $106 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $407 |
Good round-trip deal | $329 or less |
Good one-way deal | $189 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Francisco 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 20, 2026.
Use the filters below to find and compare flights from Illinois to San Francisco that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Sat 10/10
7:05 pm-9:45 pm
Nonstop4h 40m
San Francisco
Tue 10/13
12:15 pm-10:10 pm
1 stop7h 55m
$279
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Mon 8/31
4:25 pm-10:50 pm
1 stop8h 25m
San Francisco
Mon 9/7
5:35 am-11:40 am
Nonstop4h 05m
$279
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 8/18
3:10 pm-9:10 pm
2 stops8h 00m
San Francisco
Wed 8/19
6:35 am-4:00 pm
2 stops7h 25m
$283
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Mon 12/14
6:59 pm-11:57 pm
1 stop6h 58m
San Francisco
Thu 12/31
1:00 pm-11:33 pm
1 stop8h 33m
$289
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Mon 10/26
9:40 pm-12:36 am
Nonstop4h 56m
San Francisco
Wed 10/28
6:40 pm-12:57 am
Nonstop4h 17m
$292
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Wed 9/23
11:10 am-5:20 pm
2 stops8h 10m
San Francisco
Mon 9/28
10:30 pm-9:00 am
1 stop8h 30m
$294
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 8/18
3:05 pm-9:10 pm
1 stop8h 05m
San Francisco
Tue 8/25
5:40 am-5:10 pm
2 stops9h 30m
$294
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Mon 10/12
8:25 pm-12:40 am
1 stop6h 15m
San Francisco
Thu 10/15
4:00 pm-12:30 am
1 stop6h 30m
$297
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Thu 8/6
6:10 am-8:47 am
Nonstop4h 37m
San Francisco
Sat 8/8
4:21 pm-10:59 pm
Nonstop4h 38m
$311
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Thu 8/6
12:05 pm-5:35 pm
1 stop7h 30m
San Francisco
Mon 8/10
7:55 pm-5:40 am
1 stop7h 45m
$315
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Francisco
Have a flexible travel schedule? Discover the best time to fly to San Francisco from Illinois with our price prediction graph.
MDW-SFO
ORD-SFO
PIA-SFO
STL-SFO
MLI-SFO
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 San Francisco
USIL-SFO
MDW-SFO
ORD-SFO
PIA-SFO
STL-SFO
What is the cheapest month to book a flight from Illinois to San Francisco?
Currently, September is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $332). Flying from Illinois to San Francisco in June is currently the most expensive (average of $476). 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 SFO?
Find hourly flight availability from Illinois to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 20, 2026.
It’s optimal to fly from Illinois to San Francisco in the evening. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight in the afternoon.
Weekly flight availability from Illinois to San Francisco
Explore weekly flight availability from Illinois to San Francisco. 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 20, 2026.
The most flights from USIL to SFO are scheduled on a Sunday (90 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (67 on average).
How much does it cost to fly round-trip from Illinois to San Francisco?
How far ahead should I book a flight from Illinois to San Francisco?
Booking 59 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to San Francisco. 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 Illinois to San Francisco?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Francisco. Price data was last updated on July 18, 2026.
Travelers seeking maximum savings on their Illinois to San Francisco flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Clara
Santa Cruz
Fairfield
Roseville
Burlingame
Rancho Cordova
San Bruno
Cupertino
Emeryville
Newark
Watsonville
Hayward
Redwood City
San Carlos
San Ramon
Turlock
Vallejo
San Lorenzo
Davis
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 San Francisco
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Complete your trip
Complete your trip to San Francisco by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Francisco by cabin class
Find flights from Illinois to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Francisco flights
Browse other Illinois and San Francisco flight options. Last updated on July 20, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Francisco
Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 20, 2026.
Illinois to San Francisco flights
Consider these flights traveling from Illinois to San Francisco.
Top 7 airlines flying from Illinois to San Francisco
Discover the top 7 airlines that operate flights from Illinois to San Francisco. 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 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$124 | Average$259 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$395 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$159 | Average$308 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$214 | Average$476 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$230 | Average$436 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$234 | Average$407 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$245 | Average$455 | FlexibilityNo cancel fee | On-time69% |