$79+ 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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Apr 25 — May 21
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 March 26, 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 March 26, 2026.
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:27 am
MDW
- SFO
1 stop7h 28m
Delta
Wed 4/2210:55 pm
SFO
- MDW
1 stop7h 52m
Delta
Deal found 3/26![Delta logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 5/295:30 pm
ORD
- SFO
1 stop19h 11m
Frontier
Tue 6/912:33 pm
SFO
- ORD
1 stop6h 20m
Frontier
Deal found 3/21![Frontier logo]()
$237
This Southwest deal was found by Cheapflights users on 3/23. 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.
Wed 4/2212:50 pm
MDW
- SFO
2 stops10h 35m
Southwest
Wed 4/292:50 pm
SFO
- MDW
1 stop6h 30m
Southwest
Deal found 3/23![Southwest logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 3/23. 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.
Tue 4/1411:07 am
ORD
- SFO
2 stops28h 45m
Frontier
Wed 4/156:29 pm
SFO
- ORD
1 stop9h 21m
Frontier
Deal found 3/23![Frontier logo]()
$238
This Southwest deal was found by Cheapflights users on 3/22. 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 4/2112:50 pm
MDW
- SFO
2 stops10h 35m
Southwest
Tue 4/2810:40 pm
SFO
- MDW
1 stop7h 45m
Southwest
Deal found 3/22![Southwest logo]()
$239
This Southwest deal was found by Cheapflights users on 3/23. 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.
Tue 4/214:50 pm
ORD
- SFO
1 stop8h 25m
Southwest
Tue 4/2810:05 am
SFO
- ORD
2 stops10h 50m
Southwest
Deal found 3/23![Southwest logo]()
$239
This Expedia deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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.
Thu 5/148:56 pm
ORD
- SFO
1 stop26h 08m
Frontier
Mon 5/1811:59 pm
SFO
- ORD
1 stop9h 41m
Frontier
Deal found 3/24![Frontier logo]()
$240
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/93:07 pm
MDW
- SFO
1 stop9h 57m
Frontier
Sat 8/2211:52 pm
SFO
- MDW
1 stop12h 15m
Frontier
Deal found 3/25![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/86:55 am
ORD
- SFO
1 stop14h 39m
Frontier
Fri 5/1511:59 pm
SFO
- ORD
1 stop9h 01m
Frontier
Deal found 3/24![Frontier logo]()
$241
This Kiwi.com deal was found by Cheapflights users on 3/23. 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 5/116:05 pm
ORD
- SFO
1 stop30h 59m
Multiple Airlines
Wed 8/198:30 pm
SFO
- ORD
1 stop7h 49m
Multiple Airlines
Deal found 3/23![Multiple Airlines logo]()
$242
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/512:50 pm
MDW
- SFO
2 stops10h 35m
Southwest
Tue 5/126:20 am
SFO
- MDW
2 stops8h 15m
Southwest
Deal found 3/26![Southwest logo]()
$243
This Orbitz deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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.
Wed 4/154:10 pm
ORD
- SFO
1 stop8h 42m
Multiple Airlines
Sat 4/1810:38 pm
SFO
- ORD
1 stop10h 59m
Multiple Airlines
Deal found 3/24![Multiple Airlines logo]()
$243
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 March 26, 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 March 26, 2026.
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 6/24:00 pm
MDW
- SFO
2 stops9h 15m
Southwest
Tue 6/911:40 am
SFO
- MDW
1 stop9h 25m
Southwest
Deal found 3/24![Southwest logo]()
$238
This Alaska Airlines deal was found by Cheapflights users on 3/21. 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.
Fri 9/47:55 pm
ORD
- SFO
1 stop14h 07m
Alaska Airlines
Mon 9/77:01 pm
SFO
- ORD
1 stop16h 08m
Alaska Airlines
Deal found 3/21![Alaska Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 3/21. 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 5/284:30 pm
ORD
- SFO
Nonstop4h 54m
United Airlines
Tue 6/95:05 am
SFO
- ORD
Nonstop4h 26m
United Airlines
Deal found 3/21![United Airlines logo]()
$335
This American Airlines deal was found by Cheapflights users on 3/23. 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 5/26:05 am
CMI
- SFO
1 stop8h 33m
American Airlines
Mon 5/1110:06 am
SFO
- CMI
1 stop8h 33m
American Airlines
Deal found 3/23![American Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 3/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:35 am
ORD
- SFO
1 stop7h 51m
Delta
Sun 8/161:00 pm
SFO
- ORD
1 stop8h 45m
Delta
Deal found 3/23![Delta logo]()
$391
This Southwest deal was found by Cheapflights users on 3/23. 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 5/29:10 am
MDW
- SFO
1 stop9h 10m
Southwest
Wed 5/65:25 am
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 3/23![Southwest logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 7/87:31 pm
SPI
- SFO
1 stop16h 58m
Multiple Airlines
Mon 7/1310:50 pm
SFO
- SPI
2 stops42h 01m
Multiple Airlines
Deal found 3/24![Multiple Airlines logo]()
$547
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:15 am
MDW
- SFO
1 stop11h 55m
Southwest
Tue 5/2610:40 pm
SFO
- MDW
1 stop7h 45m
Southwest
Deal found 3/26![Southwest logo]()
$261
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1510:00 am
MDW
- SFO
Nonstop4h 35m
Southwest
Wed 4/225:25 am
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 3/25![Southwest logo]()
$274
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:40 pm
ORD
- SFO
Nonstop4h 59m
United Airlines
Wed 4/2211:52 pm
SFO
- ORD
Nonstop4h 28m
United Airlines
Deal found 3/24![United Airlines logo]()
$337
This American Airlines deal was found by Cheapflights users on 3/23. 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 8/84:43 pm
PIA
- SFO
1 stop8h 30m
American Airlines
Sat 8/1511:10 pm
SFO
- PIA
1 stop8h 26m
American Airlines
Deal found 3/23![American Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/42:31 pm
ORD
- SFO
Nonstop4h 48m
United Airlines
Mon 9/710:35 pm
SFO
- ORD
Nonstop4h 26m
United Airlines
Deal found 3/25![United Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 3/23. 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.
Fri 5/159:45 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Mon 5/1811:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Deal found 3/23![Southwest logo]()
$290
This American Airlines deal was found by Cheapflights users on 3/22. 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.
Fri 4/176:41 pm
MLI
- SFO
1 stop7h 18m
American Airlines
Fri 4/242:57 pm
SFO
- MLI
1 stop6h 57m
American Airlines
Deal found 3/22![American Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/94:04 pm
BMI
- SFO
1 stop10h 31m
Delta
Mon 4/1311:39 pm
SFO
- BMI
1 stop9h 40m
Delta
Deal found 3/25![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/125:45 am
CMI
- SFO
1 stop6h 48m
United Airlines
Sat 5/1612:45 am
SFO
- CMI
1 stop6h 21m
United Airlines
Deal found 3/24![United Airlines logo]()
$358
This American Airlines deal was found by Cheapflights users on 3/21. 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.
Thu 5/143:45 pm
BMI
- SFO
1 stop10h 09m
American Airlines
Sun 5/1711:28 pm
SFO
- BMI
1 stop9h 18m
American Airlines
Deal found 3/21![American Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 3/22. 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 5/148:00 am
ORD
- SFO
2 stops11h 00m
Southwest
Wed 5/207:40 am
SFO
- ORD
2 stops13h 15m
Southwest
Deal found 3/22![Southwest logo]()
$310
This Delta deal was found by Cheapflights users on 3/21. 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.
Wed 4/224:20 pm
BMI
- SFO
1 stop8h 29m
Delta
Mon 4/2711:39 pm
SFO
- BMI
1 stop9h 40m
Delta
Deal found 3/21![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 3/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:10 am
ORD
- SFO
Nonstop4h 37m
United Airlines
Mon 6/110:38 pm
SFO
- ORD
Nonstop4h 23m
United Airlines
Deal found 3/23![United Airlines logo]()
$359
This American Airlines deal was found by Cheapflights users on 3/23. 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.
Tue 4/147:00 am
PIA
- SFO
2 stops10h 25m
American Airlines
Sat 4/181:16 pm
SFO
- PIA
1 stop8h 36m
American Airlines
Deal found 3/23![American Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 3/21. 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.
Tue 5/59:00 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Tue 5/1211:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Deal found 3/21![Southwest logo]()
$313
This Delta deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/84:14 pm
BMI
- SFO
1 stop8h 34m
Delta
Fri 5/1510:55 pm
SFO
- BMI
1 stop10h 28m
Delta
Deal found 3/24![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 3/21. 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 4/167:43 pm
PIA
- SFO
1 stop6h 56m
United Airlines
Sat 4/1812:45 am
SFO
- PIA
1 stop7h 17m
United Airlines
Deal found 3/21![United Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Wed 8/57:31 pm
SPI
- SFO
1 stop16h 58m
Multiple Airlines
Fri 8/711:52 pm
SFO
- SPI
2 stops17h 49m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$552
This Delta deal was found by Cheapflights users on 3/22. 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.
Tue 5/53:25 pm
STL
- SFO
2 stops10h 12m
Delta
Tue 5/125:55 am
SFO
- STL
2 stops11h 08m
Delta
Deal found 3/22![Delta logo]()
$435
This United Airlines deal was found by Cheapflights users on 3/21. 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 4/185:35 pm
PIA
- SFO
1 stop7h 10m
United Airlines
Sat 4/2511:52 pm
SFO
- PIA
1 stop8h 10m
United Airlines
Deal found 3/21![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/11:35 pm
ORD
- SFO
2 stops10h 50m
Southwest
Mon 5/41:25 pm
SFO
- ORD
2 stops8h 30m
Southwest
Deal found 3/24![Southwest logo]()
$336
This American Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/93:09 pm
CMI
- SFO
1 stop10h 00m
American Airlines
Mon 4/1311:52 am
SFO
- CMI
1 stop7h 43m
American Airlines
Deal found 3/25![American Airlines logo]()
$408
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sat 8/88:21 pm
SPI
- SFO
1 stop16h 08m
Multiple Airlines
Thu 8/1310:50 pm
SFO
- SPI
2 stops42h 51m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$562
Last-minute flights from Illinois to San FranciscoDiscover last-minute flight deals from Illinois to San Francisco. Data last updated March 26, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco. Data last updated March 26, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/319:28 am
ORD
- SFO
1 stop11h 46m
Frontier
Wed 4/16:00 am
SFO
- ORD
1 stop6h 19m
Frontier
Deal found 3/25![Frontier logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Tue 3/318:55 pm
ORD
- SFO
1 stop20h 21m
Frontier
Fri 4/108:14 pm
SFO
- ORD
1 stop7h 25m
Frontier
Deal found 3/22![Frontier logo]()
$260
This Cheapflightsfares deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/13:29 pm
ORD
- SFO
1 stop10h 54m
Frontier
Wed 4/88:14 pm
SFO
- ORD
1 stop7h 25m
Frontier
Deal found 3/25![Frontier logo]()
$251
This Cheapflightsfares deal was found by Cheapflights users on 3/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:53 pm
ORD
- SFO
1 stop8h 30m
Frontier
Fri 4/109:00 pm
SFO
- ORD
1 stop25h 38m
Frontier
Deal found 3/23![Frontier logo]()
$259
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:15 am
MDW
- SFO
1 stop8h 20m
Southwest
Wed 4/2211:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Deal found 3/26![Southwest logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:15 pm
MDW
- SFO
2 stops30h 58m
Frontier
Sun 4/1911:16 pm
SFO
- MDW
1 stop21h 05m
Frontier
Deal found 3/24![Frontier logo]()
$254
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:27 am
MDW
- SFO
1 stop7h 28m
Delta
Wed 4/2210:55 pm
SFO
- MDW
1 stop7h 52m
Delta
Deal found 3/26![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 3/22. 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 4/2112:50 pm
MDW
- SFO
2 stops10h 35m
Southwest
Tue 4/2810:40 pm
SFO
- MDW
1 stop7h 45m
Southwest
Deal found 3/22![Southwest logo]()
$239
This Southwest deal was found by Cheapflights users on 3/23. 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.
Wed 4/2212:50 pm
MDW
- SFO
2 stops10h 35m
Southwest
Wed 4/292:50 pm
SFO
- MDW
1 stop6h 30m
Southwest
Deal found 3/23![Southwest logo]()
$238
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/224:00 pm
MDW
- SFO
2 stops9h 15m
Southwest
Mon 4/2711:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Deal found 3/26![Southwest logo]()
$251
This Priceline deal was found by Cheapflights users on 3/23. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:00 am
MDW
- SFO
1 stop13h 34m
Frontier
Sun 4/2611:16 pm
SFO
- MDW
1 stop11h 19m
Frontier
Deal found 3/23![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 3/23. 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.
Wed 4/296:10 am
MDW
- SFO
2 stops14h 35m
Frontier
Mon 5/411:26 pm
SFO
- MDW
1 stop12h 46m
Frontier
Deal found 3/23![Frontier logo]()
$249
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 March 26, 2026.
Search for one-way flight options from Illinois to San Francisco. Find affordable one-way fares based on user searches. Data last updated March 26, 2026.
This Super.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/168:06 pm
STL
- SFO
1 stop6h 21m
Frontier
Deal found 3/24![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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.
Tue 5/56:51 pm
STL
- SFO
1 stop17h 50m
Frontier
Deal found 3/24![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 3/23. 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 4/209:55 pm
STL
- SFO
1 stop17h 57m
Frontier
Deal found 3/23![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/243:33 pm
STL
- SFO
1 stop9h 31m
Frontier
Deal found 3/25![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:08 pm
STL
- SFO
1 stop6h 15m
Frontier
Deal found 3/25![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/258:17 pm
STL
- SFO
1 stop14h 56m
Frontier
Deal found 3/24![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 5/159:18 pm
STL
- SFO
1 stop13h 12m
Frontier
Deal found 3/21![Frontier logo]()
$110
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:14 pm
STL
- SFO
1 stop20h 49m
Frontier
Deal found 3/25![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/118:08 pm
STL
- SFO
1 stop30h 15m
Frontier
Deal found 3/24![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 3/23. 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.
Thu 4/238:06 pm
STL
- SFO
1 stop6h 21m
Frontier
Deal found 3/23![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 3/23. 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.
Fri 4/249:58 pm
STL
- SFO
1 stop22h 47m
Frontier
Deal found 3/23![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/224:59 pm
STL
- SFO
2 stops26h 52m
Frontier
Deal found 3/25![Frontier logo]()
$122
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 March 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $237 (Kiwi.com) |
One-way from | $79 (Super.com) |
Popular in | February |
Cheapest in | May |
Average price | $397 |
Good round-trip deal | $297 or less |
Good one-way deal | $136 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 March 26, 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
Tue 6/2
4:00 pm-11:15 pm
2 stops9h 15m
San Francisco
Tue 6/9
11:40 am-11:05 pm
1 stop9h 25m
$238
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Sat 5/2
9:10 am-4:20 pm
1 stop9h 10m
San Francisco
Wed 5/6
5:25 am-11:35 am
Nonstop4h 10m
$246
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Sat 5/23
6:15 am-4:10 pm
1 stop11h 55m
San Francisco
Tue 5/26
10:40 pm-8:25 am
1 stop7h 45m
$261
Quickest round-trip
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Wed 4/15
10:00 am-12:35 pm
Nonstop4h 35m
San Francisco
Wed 4/22
5:25 am-11:35 am
Nonstop4h 10m
$274
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Fri 5/15
9:45 pm-12:20 am
Nonstop4h 35m
San Francisco
Mon 5/18
11:25 pm-5:40 am
Nonstop4h 15m
$290
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Thu 5/14
8:00 am-5:00 pm
2 stops11h 00m
San Francisco
Wed 5/20
7:40 am-10:55 pm
2 stops13h 15m
$310
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 5/5
9:00 pm-11:35 pm
Nonstop4h 35m
San Francisco
Tue 5/12
11:25 pm-5:40 am
Nonstop4h 15m
$313
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Fri 9/4
7:55 pm-8:02 am
1 stop14h 07m
San Francisco
Mon 9/7
7:01 pm-1:09 pm
1 stop16h 08m
$324
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Thu 5/28
4:30 pm-7:24 pm
Nonstop4h 54m
San Francisco
Tue 6/9
5:05 am-11:31 am
Nonstop4h 26m
$335
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Fri 5/1
1:35 pm-10:25 pm
2 stops10h 50m
San Francisco
Mon 5/4
1:25 pm-11:55 pm
2 stops8h 30m
$336
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
CMI-SFO
SPI-SFO
PIA-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
CMI-SFO
SPI-SFO
What is the cheapest month to book a flight from Illinois to San Francisco?
Currently, October is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $80). Flying from Illinois to San Francisco in February is currently the most expensive (average of $217). 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 March 26, 2026.
It’s optimal to fly from Illinois to San Francisco in the evening. By choosing this option you can save up to 29% on the cost of your flight, compared to a flight in the afternoon.
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 March 23, 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.
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 March 26, 2026.
The most flights from USIL to SFO are scheduled on a Wednesday (76 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (16 on average).
How much does it cost to fly round-trip from Illinois to San Francisco?
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
Livermore
Roseville
Rancho Cordova
San Bruno
Watsonville
San Ramon
Sunnyvale
Vacaville
San Carlos
Turlock
Redwood City
San Lorenzo
Davis
Manteca
Union City
Elk Grove
Rohnert Park
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 March 26, 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 March 26, 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 March 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$108 | Average$217 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$120 | Average$237 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$350 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$386 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$159 | Average$304 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$186 | Average$267 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$197 | Average$458 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$207 | Average$415 | FlexibilityNo cancel fee | On-time69% |