$97+ 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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Jun 22 — Jun 291
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 May 23, 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 May 23, 2026.
This Frontier deal was found by Cheapflights users on 5/20. 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.
Fri 8/146:00 am
MDW
- SFO
1 stop15h 13m
Frontier
Sun 8/2310:15 pm
SFO
- MDW
1 stop10h 54m
Frontier
Deal found 5/20![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 5/20. 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.
Sun 11/151:02 pm
ORD
- SFO
1 stop12h 48m
Frontier
Tue 11/174:00 pm
SFO
- ORD
1 stop11h 35m
Frontier
Deal found 5/20![Frontier logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 5/19. 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.
Tue 7/77:15 am
ORD
- SFO
2 stops16h 54m
Frontier
Wed 7/88:23 pm
SFO
- ORD
1 stop7h 54m
Frontier
Deal found 5/19![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 5/18. 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 7/155:35 am
MDW
- SFO
1 stop8h 00m
Southwest
Tue 7/216:00 am
SFO
- MDW
2 stops8h 55m
Southwest
Deal found 5/18![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 5/18. 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.
Wed 6/177:30 am
ORD
- SFO
Nonstop4h 49m
United Airlines
Tue 8/46:34 pm
SFO
- ORD
Nonstop4h 25m
United Airlines
Deal found 5/18![United Airlines logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
Mon 6/157:20 am
ORD
- SFO
1 stop8h 56m
Frontier
Mon 6/228:45 pm
SFO
- ORD
1 stop6h 22m
Frontier
Deal found 5/22![Frontier logo]()
$283
This Orbitz deal was found by Cheapflights users on 5/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2012:27 pm
MDW
- SFO
1 stop8h 58m
Frontier
Tue 8/2510:15 pm
SFO
- MDW
1 stop10h 54m
Frontier
Deal found 5/18![Frontier logo]()
$284
This Cheapflightsfares deal was found by Cheapflights users on 5/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:55 am
ORD
- SFO
1 stop15h 00m
Frontier
Sat 6/138:54 pm
SFO
- ORD
1 stop6h 13m
Frontier
Deal found 5/21![Frontier logo]()
$284
This Southwest deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:00 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Wed 9/211:15 am
SFO
- MDW
2 stops9h 35m
Southwest
Deal found 5/23![Southwest logo]()
$285
This Cheapflightsfares deal was found by Cheapflights users on 5/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/109:48 pm
ORD
- SFO
1 stop28h 39m
Frontier
Mon 6/1510:58 pm
SFO
- ORD
1 stop28h 09m
Frontier
Deal found 5/21![Frontier logo]()
$285
This Southwest deal was found by Cheapflights users on 5/22. 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.
Thu 9/1010:35 am
MDW
- SFO
2 stops9h 00m
Southwest
Wed 9/1611:50 am
SFO
- MDW
1 stop8h 00m
Southwest
Deal found 5/22![Southwest logo]()
$286
This Cheapflightsfares deal was found by Cheapflights users on 5/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/177:05 am
ORD
- SFO
1 stop14h 13m
Frontier
Sun 7/198:23 pm
SFO
- ORD
1 stop7h 54m
Frontier
Deal found 5/22![Frontier logo]()
$286
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 May 23, 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 May 23, 2026.
This Southwest deal was found by Cheapflights users on 5/18. 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.
Thu 9/1011:05 am
MDW
- SFO
2 stops8h 50m
Southwest
Tue 9/1511:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 5/18![Southwest logo]()
$287
This Delta deal was found by Cheapflights users on 5/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/151:00 pm
MDW
- SFO
1 stop7h 48m
Delta
Mon 9/2110:45 pm
SFO
- MDW
1 stop7h 57m
Delta
Deal found 5/21![Delta logo]()
$292
This United Airlines deal was found by Cheapflights users on 5/21. 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 8/157:40 am
ORD
- SFO
Nonstop4h 49m
United Airlines
Fri 8/216:38 pm
SFO
- ORD
Nonstop4h 21m
United Airlines
Deal found 5/21![United Airlines logo]()
$320
This American Airlines deal was found by Cheapflights users on 5/18. 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.
Tue 9/17:20 am
MLI
- SFO
2 stops10h 40m
American Airlines
Wed 9/99:22 am
SFO
- MLI
1 stop10h 17m
American Airlines
Deal found 5/18![American Airlines logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 5/20. 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.
Fri 6/1212:55 pm
PIA
- SFO
1 stop27h 21m
Multiple Airlines
Sun 6/1410:58 pm
SFO
- PIA
1 stop11h 07m
Multiple Airlines
Deal found 5/20![Multiple Airlines logo]()
$491
This Alaska Airlines deal was found by Cheapflights users on 5/20. 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.
Tue 8/2510:16 am
STL
- SFO
2 stops9h 06m
Alaska Airlines
Wed 8/268:23 am
SFO
- STL
1 stop6h 47m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$548
This Delta deal was found by Cheapflights users on 5/20. 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 8/153:25 pm
ORD
- SFO
1 stop10h 29m
Delta
Wed 8/261:45 pm
SFO
- ORD
1 stop8h 13m
Delta
Deal found 5/20![Delta logo]()
$292
This Southwest deal was found by Cheapflights users on 5/22. 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.
Thu 7/210:05 am
MDW
- SFO
1 stop6h 30m
Southwest
Wed 7/85:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 5/22![Southwest logo]()
$304
This United Airlines deal was found by Cheapflights users on 5/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/237:30 am
ORD
- SFO
Nonstop4h 49m
United Airlines
Wed 7/13:10 pm
SFO
- ORD
Nonstop4h 28m
United Airlines
Deal found 5/22![United Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 5/18. 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.
Thu 11/512:20 pm
MDW
- SFO
2 stops8h 05m
Southwest
Mon 11/92:30 pm
SFO
- MDW
1 stop6h 30m
Southwest
Deal found 5/18![Southwest logo]()
$308
This Delta deal was found by Cheapflights users on 5/18. 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.
Tue 9/111:00 am
MLI
- SFO
1 stop7h 55m
Delta
Wed 9/96:00 am
SFO
- MLI
1 stop8h 22m
Delta
Deal found 5/18![Delta logo]()
$331
This United Airlines deal was found by Cheapflights users on 5/19. 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.
Tue 6/239:48 pm
ORD
- SFO
Nonstop4h 57m
United Airlines
Mon 6/296:34 pm
SFO
- ORD
Nonstop4h 25m
United Airlines
Deal found 5/19![United Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 5/18. 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.
Fri 9/2510:35 am
MDW
- SFO
2 stops9h 00m
Southwest
Tue 9/2911:40 pm
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 5/18![Southwest logo]()
$320
This Delta deal was found by Cheapflights users on 5/19. 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.
Sat 8/89:20 am
ORD
- SFO
1 stop8h 30m
Delta
Sat 8/810:59 pm
SFO
- ORD
1 stop6h 57m
Delta
Deal found 5/19![Delta logo]()
$333
This American Airlines deal was found by Cheapflights users on 5/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:12 am
PIA
- SFO
2 stops10h 50m
American Airlines
Thu 9/31:15 pm
SFO
- PIA
1 stop8h 43m
American Airlines
Deal found 5/22![American Airlines logo]()
$410
This Southwest deal was found by Cheapflights users on 5/21. 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.
Mon 6/295:10 am
MDW
- SFO
1 stop8h 10m
Southwest
Tue 7/75:00 am
SFO
- MDW
2 stops7h 35m
Southwest
Deal found 5/21![Southwest logo]()
$321
This United Airlines deal was found by Cheapflights users on 5/21. 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.
Thu 7/29:05 am
MLI
- SFO
1 stop8h 04m
United Airlines
Sat 7/412:50 am
SFO
- MLI
1 stop7h 14m
United Airlines
Deal found 5/21![United Airlines logo]()
$369
This American Airlines deal was found by Cheapflights users on 5/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/85:01 pm
EVV
- SFO
1 stop7h 17m
American Airlines
Sat 8/155:30 am
SFO
- EVV
1 stop9h 01m
American Airlines
Deal found 5/20![American Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/304:14 pm
BMI
- SFO
1 stop10h 22m
Delta
Mon 8/1011:35 pm
SFO
- BMI
1 stop9h 52m
Delta
Deal found 5/22![Delta logo]()
$349
This Southwest deal was found by Cheapflights users on 5/22. 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.
Fri 7/102:30 pm
MDW
- SFO
1 stop7h 55m
Southwest
Wed 7/155:00 am
SFO
- MDW
2 stops7h 35m
Southwest
Deal found 5/22![Southwest logo]()
$328
This United Airlines deal was found by Cheapflights users on 5/21. 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.
Thu 6/256:10 am
ORD
- SFO
Nonstop4h 37m
United Airlines
Wed 7/16:34 pm
SFO
- ORD
Nonstop4h 25m
United Airlines
Deal found 5/21![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 5/18. 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.
Thu 10/294:00 pm
BMI
- SFO
1 stop8h 51m
Delta
Wed 11/411:45 pm
SFO
- BMI
1 stop9h 32m
Delta
Deal found 5/18![Delta logo]()
$349
This American Airlines deal was found by Cheapflights users on 5/18. 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.
Thu 10/294:33 pm
BMI
- SFO
1 stop9h 39m
American Airlines
Wed 11/47:14 am
SFO
- BMI
2 stops10h 29m
American Airlines
Deal found 5/18![American Airlines logo]()
$429
This Southwest deal was found by Cheapflights users on 5/19. 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.
Tue 6/305:50 pm
MDW
- SFO
2 stops7h 25m
Southwest
Wed 7/86:00 am
SFO
- MDW
2 stops8h 55m
Southwest
Deal found 5/19![Southwest logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 8/283:04 pm
STL
- SFO
1 stop10h 36m
Alaska Airlines
Wed 9/210:32 am
SFO
- STL
2 stops11h 10m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$561
This United Airlines deal was found by Cheapflights users on 5/20. 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.
Thu 10/296:00 am
BMI
- SFO
1 stop6h 43m
United Airlines
Wed 11/411:50 pm
SFO
- BMI
1 stop7h 07m
United Airlines
Deal found 5/20![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/181:05 pm
MDW
- SFO
1 stop8h 32m
Delta
Tue 12/112:40 am
SFO
- MDW
1 stop6h 09m
Delta
Deal found 5/22![Delta logo]()
$355
This American Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” 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 7/114:43 pm
PIA
- SFO
1 stop10h 00m
American Airlines
Wed 7/2212:17 pm
SFO
- PIA
2 stops10h 05m
American Airlines
Deal found 5/23![American Airlines logo]()
$440
This Southwest deal was found by Cheapflights users on 5/18. 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 6/96:00 am
MDW
- SFO
1 stop9h 40m
Southwest
Thu 6/113:10 pm
SFO
- MDW
1 stop7h 50m
Southwest
Deal found 5/18![Southwest logo]()
$352
This American Airlines deal was found by Cheapflights users on 5/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:45 pm
PIA
- SFO
1 stop7h 03m
American Airlines
Sun 8/96:36 am
SFO
- PIA
1 stop7h 17m
American Airlines
Deal found 5/20![American Airlines logo]()
$442
Last-minute flights from Illinois to San FranciscoDiscover last-minute flight deals from Illinois to San Francisco. Data last updated May 23, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco. Data last updated May 23, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/20. 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.
Tue 6/96:55 am
ORD
- SFO
1 stop15h 00m
Frontier
Mon 6/158:45 pm
SFO
- ORD
1 stop6h 22m
Frontier
Deal found 5/20![Frontier logo]()
$288
This Cheapflightsfares deal was found by Cheapflights users on 5/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/109:48 pm
ORD
- SFO
1 stop28h 39m
Frontier
Mon 6/1510:58 pm
SFO
- ORD
1 stop28h 09m
Frontier
Deal found 5/21![Frontier logo]()
$285
This Cheapflightsfares deal was found by Cheapflights users on 5/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:55 am
ORD
- SFO
1 stop15h 00m
Frontier
Sat 6/138:54 pm
SFO
- ORD
1 stop6h 13m
Frontier
Deal found 5/21![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 5/21. 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.
Fri 6/126:55 am
ORD
- SFO
1 stop15h 00m
Frontier
Tue 6/236:00 am
SFO
- ORD
1 stop12h 43m
Frontier
Deal found 5/21![Frontier logo]()
$287
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/132:35 pm
ORD
- SFO
1 stop9h 53m
Delta
Wed 6/241:38 pm
SFO
- ORD
1 stop8h 01m
Delta
Deal found 5/22![Delta logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
Mon 6/157:20 am
ORD
- SFO
1 stop8h 56m
Frontier
Mon 6/228:45 pm
SFO
- ORD
1 stop6h 22m
Frontier
Deal found 5/22![Frontier logo]()
$283
This Cheapflightsfares deal was found by Cheapflights users on 5/18. 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 6/167:20 am
ORD
- SFO
1 stop8h 56m
Frontier
Mon 6/2210:58 pm
SFO
- ORD
1 stop28h 09m
Frontier
Deal found 5/18![Frontier logo]()
$286
This United Airlines deal was found by Cheapflights users on 5/18. 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.
Wed 6/177:30 am
ORD
- SFO
Nonstop4h 49m
United Airlines
Tue 8/46:34 pm
SFO
- ORD
Nonstop4h 25m
United Airlines
Deal found 5/18![United Airlines logo]()
$282
This Cheapflightsfares deal was found by Cheapflights users on 5/19. 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.
Wed 6/249:48 pm
ORD
- SFO
1 stop28h 39m
Frontier
Sat 7/1112:33 pm
SFO
- ORD
1 stop6h 19m
Frontier
Deal found 5/19![Frontier logo]()
$281
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/291:49 pm
MDW
- SFO
1 stop9h 11m
Delta
Mon 7/612:35 am
SFO
- MDW
1 stop6h 02m
Delta
Deal found 5/22![Delta logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” 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 6/299:48 pm
ORD
- SFO
2 stops47h 47m
Frontier
Tue 7/78:23 pm
SFO
- ORD
1 stop7h 54m
Frontier
Deal found 5/23![Frontier logo]()
$291
This Delta deal was found by Cheapflights users on 5/18. 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.
Tue 6/306:00 am
MDW
- SFO
1 stop7h 45m
Delta
Fri 8/712:12 am
SFO
- MDW
1 stop6h 28m
Delta
Deal found 5/18![Delta logo]()
$292
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 May 23, 2026.
Search for one-way flight options from Illinois to San Francisco. Find affordable one-way fares based on user searches. Data last updated May 23, 2026.
This deal was found by Cheapflights users on 5/21. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/35:32 pm
STL
- SFO
1 stop8h 18m
Frontier
Deal found 5/21![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 5/20. 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 7/26:00 am
MDW
- SFO
1 stop15h 26m
Frontier
Deal found 5/20![Frontier logo]()
$132
This Super.com deal was found by Cheapflights users on 5/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:08 pm
STL
- SFO
1 stop6h 19m
Frontier
Deal found 5/18![Frontier logo]()
$132
This Frontier deal was found by Cheapflights users on 5/19. 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 6/116:55 am
ORD
- SFO
1 stop15h 00m
Frontier
Deal found 5/19![Frontier logo]()
$132
This Super.com deal was found by Cheapflights users on 5/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:11 pm
MDW
- SFO
1 stop9h 02m
Frontier
Deal found 5/20![Frontier logo]()
$133
This Cheapflightsfares deal was found by Cheapflights users on 5/19. 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.
Tue 6/167:20 am
ORD
- SFO
1 stop8h 56m
Frontier
Deal found 5/19![Frontier logo]()
$133
This Super.com deal was found by Cheapflights users on 5/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2912:11 pm
MDW
- SFO
1 stop9h 02m
Frontier
Deal found 5/18![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 5/20. 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.
Tue 7/148:08 pm
STL
- SFO
1 stop30h 10m
Frontier
Deal found 5/20![Frontier logo]()
$134
This Cheapflightsfares deal was found by Cheapflights users on 5/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/237:20 am
ORD
- SFO
1 stop8h 56m
Frontier
Deal found 5/22![Frontier logo]()
$134
This Expedia deal was found by Cheapflights users on 5/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/912:27 pm
MDW
- SFO
1 stop9h 28m
Frontier
Deal found 5/18![Frontier logo]()
$135
This CheapOair deal was found by Cheapflights users on 5/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:20 am
ORD
- SFO
1 stop9h 05m
Frontier
Deal found 5/19![Frontier logo]()
$135
This Frontier deal was found by Cheapflights users on 5/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:04 pm
MDW
- SFO
1 stop9h 22m
Frontier
Deal found 5/22![Frontier logo]()
$136
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 May 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $277 (Delta) |
One-way from | $97 |
Popular in | February |
Cheapest in | September |
Average price | $386 |
Good round-trip deal | $375 or less |
Good one-way deal | $204 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 May 23, 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
Thu 9/10
11:05 am-5:55 pm
2 stops8h 50m
San Francisco
Tue 9/15
11:40 pm-5:50 am
Nonstop4h 10m
$287
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 9/15
1:00 pm-6:48 pm
1 stop7h 48m
San Francisco
Mon 9/21
10:45 pm-8:42 am
1 stop7h 57m
$292
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Sat 8/15
3:25 pm-11:54 pm
1 stop10h 29m
San Francisco
Wed 8/26
1:45 pm-11:58 pm
1 stop8h 13m
$292
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Thu 7/2
10:05 am-2:35 pm
1 stop6h 30m
San Francisco
Wed 7/8
5:15 am-11:25 am
Nonstop4h 10m
$304
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Thu 11/5
12:20 pm-6:25 pm
2 stops8h 05m
San Francisco
Mon 11/9
2:30 pm-11:00 pm
1 stop6h 30m
$308
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Sat 8/15
7:40 am-10:29 am
Nonstop4h 49m
San Francisco
Fri 8/21
6:38 pm-12:59 am
Nonstop4h 21m
$320
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Fri 9/25
10:35 am-5:35 pm
2 stops9h 00m
San Francisco
Tue 9/29
11:40 pm-5:50 am
Nonstop4h 10m
$320
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Mon 6/29
5:10 am-11:20 am
1 stop8h 10m
San Francisco
Tue 7/7
5:00 am-2:35 pm
2 stops7h 35m
$321
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Fri 7/10
2:30 pm-8:25 pm
1 stop7h 55m
San Francisco
Wed 7/15
5:00 am-2:35 pm
2 stops7h 35m
$328
MolineSan Francisco
MLI - SFO
MLISFO
Moline Quad-City
Tue 9/1
11:00 am-4:55 pm
1 stop7h 55m
San Francisco
Wed 9/9
6:00 am-4:22 pm
1 stop8h 22m
$331
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.
ORD-SFO
MDW-SFO
BMI-SFO
EVV-SFO
STL-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
ORD-SFO
MDW-SFO
BMI-SFO
EVV-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 $341). Flying from Illinois to San Francisco in December is currently the most expensive (average of $458). 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 May 23, 2026.
It’s optimal to fly from Illinois to San Francisco in the morning. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight at noon.
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 May 23, 2026.
The most flights from USIL to SFO are scheduled on a Saturday (93 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (69 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 82 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 May 16, 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 Cruz
Santa Clara
Fairfield
Rancho Cordova
San Bruno
Watsonville
San Ramon
Vacaville
Roseville
San Carlos
Redwood City
Sunnyvale
Turlock
Vallejo
San Lorenzo
Davis
Emeryville
Manteca
Elk Grove
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
See prices for flight routes from nearby airports that may be better suited for you.
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 May 23, 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 May 23, 2026.
Illinois to San Francisco flights
Consider these flights traveling from Illinois to San Francisco.
Top 8 airlines flying from Illinois to San Francisco
Discover the top 8 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 May 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$108 | Average$217 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$120 | Average$234 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$391 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$373 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$147 | Average$264 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$186 | Average$303 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$199 | Average$443 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$224 | Average$444 | FlexibilityNo cancel fee | On-time69% |