$122+ Cheap flights from San Francisco (SFO) to Illinois
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from San Francisco to IllinoisExplore the most affordable flight options available from San Francisco to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from San Francisco to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/177:20 am -
1 stop10h 15m
Tue 10/2012:15 pm -
1 stop10h 05m
Deal found 9/16![Southwest logo]()
$256
This CheapOair deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:25 pm -
1 stop9h 09m
Tue 10/276:30 am -
1 stop6h 47m
Deal found 9/12![Frontier logo]()
$256
This Southwest deal was found by Cheapflights users on 9/16. 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 10/265:35 am -
Nonstop4h 10m
Wed 10/289:30 am -
1 stop7h 40m
Deal found 9/16![Southwest logo]()
$257
This Cheapflightsfares deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:13 pm -
1 stop27h 11m
Fri 10/168:01 pm -
1 stop26h 37m
Deal found 9/13![Frontier logo]()
$257
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:40 pm -
1 stop8h 00m
Tue 10/208:55 pm -
Nonstop4h 45m
Deal found 9/14![Southwest logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/158:58 am -
2 stops14h 01m
Thu 10/2210:26 am -
1 stop9h 29m
Deal found 9/15![Frontier logo]()
$258
This Trip.com deal was found by Cheapflights users on 9/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:59 pm -
1 stop12h 36m
Thu 10/151:12 pm -
1 stop11h 13m
Deal found 9/17![Frontier logo]()
$259
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:15 pm -
1 stop12h 02m
Thu 10/83:30 pm -
1 stop27h 37m
Deal found 9/16![Frontier logo]()
$259
This Expedia deal was found by Cheapflights users on 9/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:59 pm -
1 stop12h 36m
Tue 10/206:21 am -
1 stop13h 34m
Deal found 9/16![Frontier logo]()
$260
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/1511:22 am -
2 stops11h 37m
Mon 10/193:30 pm -
1 stop18h 43m
Deal found 9/15![Frontier logo]()
$260
This Southwest deal was found by Cheapflights users on 9/15. 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 10/315:10 am -
2 stops7h 55m
Sat 11/712:55 pm -
2 stops9h 20m
Deal found 9/15![Southwest logo]()
$261
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:02 pm -
2 stops9h 14m
Tue 10/136:00 am -
1 stop13h 55m
Deal found 9/16![Frontier logo]()
$261
Best flights from San Francisco to IllinoisDiscover carefully curated flight deals from San Francisco to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from San Francisco to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 12/412:41 pm -
Nonstop4h 24m
Sat 12/56:23 pm -
Nonstop5h 04m
Deal found 9/16![United Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 9/15. 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.
Mon 11/25:15 am -
2 stops10h 20m
Tue 11/310:15 am -
2 stops10h 30m
Deal found 9/15![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 10/177:11 pm -
1 stop8h 29m
Sat 10/242:14 pm -
2 stops10h 13m
Deal found 9/15![Alaska Airlines logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 11/511:06 am -
1 stop6h 56m
Wed 11/113:34 pm -
2 stops21h 43m
Deal found 9/15![Multiple Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/288:58 pm -
2 stops9h 55m
Mon 11/25:30 pm -
1 stop8h 26m
Deal found 9/15![Delta logo]()
$378
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:13 am -
1 stop7h 15m
Sun 11/156:00 am -
1 stop7h 11m
Deal found 9/13![American Airlines logo]()
$379
This Southwest deal was found by Cheapflights users on 9/15. 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 10/2911:45 am -
2 stops7h 10m
Mon 11/25:20 pm -
2 stops8h 00m
Deal found 9/15![Southwest logo]()
$293
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/1711:40 pm -
Nonstop4h 10m
Tue 10/208:55 pm -
Nonstop4h 45m
Deal found 9/16![Southwest logo]()
$298
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/1510:39 am -
1 stop7h 34m
Sun 10/189:33 pm -
1 stop21h 34m
Deal found 9/16![Multiple Airlines logo]()
$331
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 10/103:00 pm -
Nonstop4h 37m
Sun 10/186:07 am -
Nonstop4h 38m
Deal found 9/16![United Airlines logo]()
$334
This Alaska Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/264:51 pm -
2 stops10h 49m
Thu 10/297:20 am -
1 stop7h 21m
Deal found 9/13![Alaska Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 9/15. 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 11/179:25 pm -
1 stop9h 35m
Sat 11/219:40 pm -
Nonstop4h 55m
Deal found 9/15![Southwest logo]()
$308
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:58 pm -
2 stops9h 55m
Thu 10/2911:19 am -
1 stop8h 58m
Deal found 9/16![Delta logo]()
$378
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/2210:39 am -
1 stop6h 51m
Sun 10/258:53 pm -
1 stop13h 20m
Deal found 9/15![Multiple Airlines logo]()
$347
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/85:00 am -
Nonstop4h 25m
Sun 10/116:07 am -
Nonstop4h 38m
Deal found 9/15![United Airlines logo]()
$350
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 10/104:43 pm -
1 stop18h 42m
Sat 10/177:20 am -
2 stops12h 50m
Deal found 9/15![Alaska Airlines logo]()
$360
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:00 am -
1 stop7h 44m
Thu 11/124:28 pm -
1 stop9h 30m
Deal found 9/13![Delta logo]()
$379
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/111:17 am -
1 stop6h 56m
Sun 10/49:36 pm -
1 stop15h 19m
Deal found 9/13![Multiple Airlines logo]()
$362
This United Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/272:00 pm -
Nonstop4h 22m
Sat 10/319:57 pm -
Nonstop4h 56m
Deal found 9/12![United Airlines logo]()
$365
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 9/292:00 pm -
1 stop7h 18m
Sat 10/36:00 am -
1 stop7h 29m
Deal found 9/15![American Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:10 am -
2 stops7h 20m
Thu 11/512:45 pm -
2 stops9h 25m
Deal found 9/14![Southwest logo]()
$345
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/65:10 pm -
Nonstop4h 17m
Sun 11/88:55 am -
Nonstop4h 55m
Deal found 9/15![United Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/129:14 am -
2 stops8h 48m
Sun 11/158:37 pm -
1 stop13h 42m
Deal found 9/12![Multiple Airlines logo]()
$370
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:30 pm -
1 stop9h 56m
Mon 10/194:26 pm -
1 stop9h 30m
Deal found 9/13![Delta logo]()
$409
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:36 am -
1 stop7h 18m
Wed 10/72:30 pm -
1 stop7h 41m
Deal found 9/16![American Airlines logo]()
$459
This Southwest deal was found by Cheapflights users on 9/15. 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 1/286:35 am -
2 stops7h 55m
Sun 1/3111:45 am -
2 stops9h 30m
Deal found 9/15![Southwest logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:11 pm -
1 stop22h 19m
Sun 10/258:53 pm -
1 stop13h 20m
Deal found 9/14![Multiple Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 11/216:42 pm -
Nonstop4h 17m
Fri 11/276:00 am -
Nonstop4h 44m
Deal found 9/16![United Airlines logo]()
$391
This Alaska Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1011:00 am -
1 stop10h 59m
Sat 10/176:02 am -
2 stops13h 42m
Deal found 9/13![Alaska Airlines logo]()
$478
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:00 am -
1 stop9h 25m
Tue 10/206:05 pm -
1 stop7h 51m
Deal found 9/13![Delta logo]()
$449
Last-minute flights from San Francisco to IllinoisDiscover last-minute flight deals from San Francisco to Illinois. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Illinois. Data last updated September 17, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:15 pm -
1 stop12h 02m
Thu 10/83:30 pm -
1 stop27h 37m
Deal found 9/16![Frontier logo]()
$259
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:02 pm -
2 stops9h 14m
Tue 10/136:00 am -
1 stop13h 55m
Deal found 9/16![Frontier logo]()
$261
This Cheapflightsfares deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:13 pm -
1 stop27h 11m
Fri 10/168:01 pm -
1 stop26h 37m
Deal found 9/13![Frontier logo]()
$257
This Trip.com deal was found by Cheapflights users on 9/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:59 pm -
1 stop12h 36m
Thu 10/151:12 pm -
1 stop11h 13m
Deal found 9/17![Frontier logo]()
$259
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:40 pm -
1 stop8h 00m
Tue 10/208:55 pm -
Nonstop4h 45m
Deal found 9/14![Southwest logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/158:58 am -
2 stops14h 01m
Thu 10/2210:26 am -
1 stop9h 29m
Deal found 9/15![Frontier logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/1511:22 am -
2 stops11h 37m
Mon 10/193:30 pm -
1 stop18h 43m
Deal found 9/15![Frontier logo]()
$260
This Expedia deal was found by Cheapflights users on 9/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:59 pm -
1 stop12h 36m
Tue 10/206:21 am -
1 stop13h 34m
Deal found 9/16![Frontier logo]()
$260
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/177:20 am -
1 stop10h 15m
Tue 10/2012:15 pm -
1 stop10h 05m
Deal found 9/16![Southwest logo]()
$256
This CheapOair deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:25 pm -
1 stop9h 09m
Tue 10/276:30 am -
1 stop6h 47m
Deal found 9/12![Frontier logo]()
$256
This Southwest deal was found by Cheapflights users on 9/16. 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 10/265:35 am -
Nonstop4h 10m
Wed 10/289:30 am -
1 stop7h 40m
Deal found 9/16![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/15. 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 10/315:10 am -
2 stops7h 55m
Sat 11/712:55 pm -
2 stops9h 20m
Deal found 9/15![Southwest logo]()
$261
One-way flights from San Francisco to IllinoisSearch for one-way flight options from San Francisco to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from San Francisco to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/611:17 am -
2 stops11h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/207:25 pm -
2 stops17h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$124
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/139:11 am -
2 stops19h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$124
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:55 pm -
1 stop8h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/205:48 pm -
1 stop17h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$126
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:45 pm -
1 stop7h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Delta logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/611:17 am -
2 stops28h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$127
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 10/54:43 pm -
1 stop18h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Alaska Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 11/1210:23 pm -
2 stops33h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/133:11 pm -
2 stops21h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 11/54:57 pm -
2 stops15h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$129
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:06 am -
1 stop16h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$129
Find flight deals from San Francisco to Illinois
Keep the following information in mind while searching for San Francisco to Illinois flight deals. Data was last updated September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $253 (Cheapflightsfares) |
One-way from | $122 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $373 |
Good round-trip deal | $360 or less |
Good one-way deal | $201 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
Use the filters below to find and compare flights from San Francisco to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Tue 11/10
11:35 am-10:45 pm
1 stop9h 10m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$126
San FranciscoChicago
SFO San Francisco - RFD Chicago Greater Rockford
SFORFD
San Francisco
Thu 11/5
4:57 pm-10:33 am
2 stops15h 36m
Chicago Greater Rockford
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$129
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Sat 10/24
6:20 am-6:00 pm
2 stops9h 40m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$131
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Wed 12/16
7:00 am-5:20 pm
2 stops8h 20m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$131
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Wed 10/21
1:25 pm-11:50 pm
2 stops8h 25m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$131
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Mon 10/19
11:40 pm-5:50 am
Nonstop4h 10m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$133
San FranciscoChicago
SFO San Francisco - MDW Chicago Midway
SFOMDW
San Francisco
Mon 11/9
11:35 pm-6:00 am
Nonstop4h 25m
Chicago Midway
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$133
San FranciscoChicago
SFO San Francisco - ORD Chicago O'Hare Intl
SFOORD
San Francisco
Mon 2/8
12:53 pm-11:59 pm
1 stop9h 06m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$142
San FranciscoChicago
SFO San Francisco - ORD Chicago O'Hare Intl
SFOORD
San Francisco
Mon 12/21
5:45 am-2:55 pm
1 stop7h 10m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$142
San FranciscoChicago
SFO San Francisco - ORD Chicago O'Hare Intl
SFOORD
San Francisco
Tue 10/13
6:10 am-12:45 pm
Nonstop4h 35m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$166
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Francisco to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from San Francisco with our price prediction graph.
SFO-ORD
SFO-MDW
SFO-RFD
SFO-MLI
SFO-BMI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Francisco to Illinois
SFO-USIL
SFO-ORD
SFO-MDW
SFO-RFD
SFO-MLI
What is the cheapest month to book a flight from San Francisco to Illinois?
Currently, February is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $371). Flying from San Francisco to Illinois in June is currently the most expensive (average of $484). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SFO to IL?
Find hourly flight availability from San Francisco to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2026.
It’s optimal to fly from San Francisco to Illinois in the evening. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from San Francisco to Illinois
Explore weekly flight availability from San Francisco to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 17, 2026.
The most flights from SFO to USIL are scheduled on a Wednesday (97 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (57 on average).
How much does it cost to fly round-trip from San Francisco to Illinois?
Airfare is below average for this route at the moment.
San Francisco to Illinois flights typically cost between $323 and $541 in October.The cheapest round-trip price found within the last 5 days was $253 on Frontier (Oct 16-Oct 19).
How far ahead should I book a flight from San Francisco to Illinois?
Booking 66 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from San Francisco to Illinois?
Use this chart to determine the cheapest time to fly round-trip from San Francisco to Illinois. Price data was last updated on September 12, 2026.
Travelers seeking maximum savings on their San Francisco to Illinois flight should consider departing on Monday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated September 17, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from San Francisco to Illinois by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from San Francisco to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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 San Francisco to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Francisco to Illinois by cabin class
Find flights from San Francisco to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Francisco and Illinois flights
Browse other San Francisco and Illinois flight options. Last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Francisco to Illinois flights
Consider these flights traveling from San Francisco to Illinois.
Top 7 airlines flying from San Francisco to Illinois
Discover the top 7 airlines that operate flights from San Francisco to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$122 | Average$376 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$157 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$204 | Average$402 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$224 | Average$306 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$237 | Average$531 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$262 | Average$499 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$266 | Average$435 | FlexibilityNo cancel fee | On-time63% |