$99+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Sep 21 — Sep 281
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to San Francisco 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to San Francisco
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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 August 22, 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 August 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
Thu 10/16:25 am -
1 stop15h 23m
Sun 10/411:58 pm -
1 stop10h 01m
Deal found 8/20![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:30 am -
1 stop6h 47m
Tue 12/18:20 am -
1 stop8h 35m
Deal found 8/20![Multiple Airlines logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:25 am -
1 stop15h 23m
Thu 9/249:00 am -
2 stops12h 44m
Deal found 8/19![Frontier logo]()
$245
This Gotogate deal was found by Cheapflights users on 8/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:18 pm -
1 stop9h 24m
Wed 9/166:04 am -
1 stop16h 19m
Deal found 8/20![Multiple Airlines logo]()
$245
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:45 am -
1 stop9h 18m
Sat 9/1211:58 pm -
1 stop10h 01m
Deal found 8/17![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:41 pm -
1 stop11h 37m
Mon 9/148:24 pm -
1 stop7h 14m
Deal found 8/17![Frontier logo]()
$246
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:05 pm -
1 stop6h 25m
Tue 9/1511:40 pm -
Nonstop4h 10m
Deal found 8/17![Southwest logo]()
$247
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:40 pm -
Nonstop4h 52m
Mon 9/284:39 pm -
Nonstop4h 30m
Deal found 8/18![United Airlines logo]()
$247
This Cheapflightsfares deal was found by Cheapflights users on 8/19. 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.
Thu 9/37:05 am -
1 stop14h 21m
Tue 9/153:15 pm -
1 stop12h 23m
Deal found 8/19![Frontier logo]()
$248
This CheapOair deal was found by Cheapflights users on 8/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:15 am -
1 stop13h 40m
Mon 10/1211:59 pm -
1 stop10h 18m
Deal found 8/20![Frontier logo]()
$249
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/611:50 am -
1 stop9h 36m
Wed 9/911:58 pm -
1 stop10h 01m
Deal found 8/18![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:30 am -
1 stop19h 44m
Sat 9/196:04 am -
2 stops15h 00m
Deal found 8/21![Frontier logo]()
$250
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 August 22, 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 August 22, 2026.
This Southwest deal was found by Cheapflights users on 8/19. 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.
Thu 10/155:25 am -
1 stop7h 40m
Tue 10/2011:40 pm -
Nonstop4h 10m
Deal found 8/19![Southwest logo]()
$247
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Fri 11/66:00 am -
Nonstop4h 44m
Thu 11/2611:30 pm -
Nonstop4h 17m
Deal found 8/21![United Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 8/21. 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 11/412:27 pm -
1 stop6h 48m
Thu 11/266:00 am -
1 stop7h 19m
Deal found 8/21![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1712:35 pm -
1 stop7h 27m
Wed 10/212:18 pm -
1 stop7h 52m
Deal found 8/21![American Airlines logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/48:29 pm -
1 stop25h 27m
Tue 9/810:23 pm -
2 stops40h 56m
Deal found 8/20![Multiple Airlines logo]()
$461
This Delta deal was found by Cheapflights users on 8/21. 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.
Sat 9/199:29 am -
1 stop6h 37m
Tue 9/2210:59 pm -
1 stop8h 08m
Deal found 8/21![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:40 pm -
1 stop7h 05m
Mon 9/287:55 pm -
1 stop7h 45m
Deal found 8/17![Southwest logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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.
Thu 10/157:02 am -
2 stops13h 48m
Sun 10/189:43 am -
1 stop12h 16m
Deal found 8/20![Alaska Airlines logo]()
$521
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Mon 9/145:00 am -
Nonstop4h 41m
Sun 9/2012:35 am -
Nonstop4h 21m
Deal found 8/18![United Airlines logo]()
$278
This Delta deal was found by Cheapflights users on 8/19. 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.
Wed 9/99:59 am -
1 stop9h 19m
Sat 9/1211:33 am -
1 stop9h 11m
Deal found 8/19![Delta logo]()
$277
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/232:35 pm -
Nonstop4h 48m
Sun 9/2711:30 pm -
Nonstop4h 29m
Deal found 8/21![United Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 8/19. 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.
Thu 11/1211:00 am -
Nonstop4h 50m
Sun 11/1511:35 pm -
Nonstop4h 25m
Deal found 8/19![Southwest logo]()
$297
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:31 pm -
1 stop9h 54m
Sat 9/1212:30 pm -
1 stop8h 45m
Deal found 8/17![American Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Sun 9/136:00 am -
Nonstop4h 38m
Mon 9/1411:30 pm -
Nonstop4h 29m
Deal found 8/21![United Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 8/18. 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.
Mon 9/145:30 pm -
1 stop8h 00m
Mon 9/213:20 pm -
1 stop6h 30m
Deal found 8/18![Southwest logo]()
$298
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:00 am -
Nonstop4h 47m
Mon 11/2312:55 am -
Nonstop4h 18m
Deal found 8/21![United Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 8/21. 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.
Fri 10/3011:33 am -
1 stop8h 29m
Mon 11/26:00 am -
1 stop8h 28m
Deal found 8/21![American Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 8/18. 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.
Sat 10/36:15 am -
1 stop6h 15m
Tue 10/66:50 pm -
2 stops8h 50m
Deal found 8/18![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/245:09 pm -
1 stop7h 50m
Wed 11/411:30 pm -
1 stop8h 48m
Deal found 8/17![Delta logo]()
$341
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/171:19 pm -
1 stop8h 45m
Thu 9/241:29 pm -
1 stop8h 34m
Deal found 8/17![American Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:07 am -
Nonstop4h 38m
Sun 9/276:10 am -
Nonstop4h 35m
Deal found 8/20![United Airlines logo]()
$297
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/311:00 pm -
1 stop10h 45m
Wed 11/410:25 pm -
1 stop9h 53m
Deal found 8/17![Delta logo]()
$341
This Southwest deal was found by Cheapflights users on 8/18. 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.
Sun 11/812:45 pm -
2 stops9h 25m
Wed 11/116:10 am -
2 stops8h 55m
Deal found 8/18![Southwest logo]()
$317
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Sat 9/191:19 pm -
1 stop6h 50m
Sat 9/2612:30 pm -
1 stop7h 38m
Deal found 8/18![American Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/245:09 pm -
1 stop7h 50m
Sun 11/16:00 am -
1 stop8h 22m
Deal found 8/17![Delta logo]()
$350
This Southwest deal was found by Cheapflights users on 8/21. 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.
Thu 11/511:00 am -
Nonstop4h 50m
Sun 11/811:35 pm -
Nonstop4h 25m
Deal found 8/21![Southwest logo]()
$328
This United Airlines deal was found by Cheapflights users on 8/19. 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.
Thu 9/105:00 am -
Nonstop4h 41m
Wed 9/1611:30 pm -
Nonstop4h 29m
Deal found 8/19![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 8/21. 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.
Thu 10/157:00 pm -
1 stop6h 56m
Tue 10/206:20 am -
2 stops9h 24m
Deal found 8/21![Delta logo]()
$365
This Southwest deal was found by Cheapflights users on 8/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:00 pm -
Nonstop4h 35m
Sun 9/208:30 pm -
1 stop7h 25m
Deal found 8/20![Southwest logo]()
$337
This American Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1912:25 pm -
1 stop8h 52m
Sat 9/262:00 pm -
1 stop7h 29m
Deal found 8/19![American Airlines logo]()
$429
Last-minute flights from Illinois to San FranciscoDiscover last-minute flight deals from Illinois to San Francisco. Data last updated August 22, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco. Data last updated August 22, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:41 pm -
1 stop11h 37m
Mon 9/148:24 pm -
1 stop7h 14m
Deal found 8/17![Frontier logo]()
$246
This Cheapflightsfares deal was found by Cheapflights users on 8/19. 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.
Thu 9/37:05 am -
1 stop14h 21m
Tue 9/153:15 pm -
1 stop12h 23m
Deal found 8/19![Frontier logo]()
$248
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:45 am -
1 stop9h 18m
Sat 9/1211:58 pm -
1 stop10h 01m
Deal found 8/17![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/611:50 am -
1 stop9h 36m
Wed 9/911:58 pm -
1 stop10h 01m
Deal found 8/18![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:30 am -
1 stop28h 14m
Wed 9/237:11 pm -
1 stop8h 27m
Deal found 8/20![Frontier logo]()
$244
This Gotogate deal was found by Cheapflights users on 8/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:18 pm -
1 stop9h 24m
Wed 9/166:04 am -
1 stop16h 19m
Deal found 8/20![Multiple Airlines logo]()
$245
This Frontier deal was found by Cheapflights users on 8/19. 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.
Fri 9/1112:54 pm -
1 stop11h 34m
Fri 9/1811:58 pm -
1 stop10h 01m
Deal found 8/19![Frontier logo]()
$251
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:05 pm -
1 stop6h 25m
Tue 9/1511:40 pm -
Nonstop4h 10m
Deal found 8/17![Southwest logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:30 am -
1 stop19h 44m
Sat 9/196:04 am -
2 stops15h 00m
Deal found 8/21![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:25 am -
1 stop15h 23m
Thu 9/249:00 am -
2 stops12h 44m
Deal found 8/19![Frontier logo]()
$245
This Frontier deal was found by Cheapflights users on 8/19. 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 9/176:30 am -
1 stop6h 17m
Fri 9/2510:05 pm -
1 stop11h 46m
Deal found 8/19![Frontier logo]()
$251
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:40 pm -
Nonstop4h 52m
Mon 9/284:39 pm -
Nonstop4h 30m
Deal found 8/18![United Airlines logo]()
$247
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 August 22, 2026.
Search for one-way flight options from Illinois to San Francisco. Find affordable one-way fares based on user searches. Data last updated August 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/98:10 pm -
2 stops19h 33m
Deal found 8/17![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/175:32 pm -
1 stop8h 18m
Deal found 8/18![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 8/21. 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.
Mon 9/218:10 pm -
2 stops40h 12m
Deal found 8/21![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop9h 56m
Deal found 8/20![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:10 pm -
2 stops19h 33m
Deal found 8/18![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:10 pm -
2 stops19h 33m
Deal found 8/20![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 8/22. 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 11/184:18 pm -
2 stops19h 53m
Deal found 8/22![Frontier logo]()
$111
This Southwest deal was found by Cheapflights users on 8/19. 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.
Fri 9/259:10 pm -
Nonstop4h 40m
Deal found 8/19![Southwest logo]()
$129
This American Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/251:29 pm -
Nonstop4h 49m
Deal found 8/19![American Airlines logo]()
$129
This Frontier deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:03 pm -
1 stop9h 44m
Deal found 8/19![Frontier logo]()
$131
This deal was found by Cheapflights users on 8/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2711:06 am -
1 stop7h 51m
Deal found 8/17![Frontier logo]()
$131
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:03 pm -
1 stop9h 44m
Deal found 8/18![Frontier logo]()
$132
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 August 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $244 (Kiwi.com) |
One-way from | $99 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $386 |
Good round-trip deal | $295 or less |
Good one-way deal | $229 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 7,457,451 searches. Data last updated August 22, 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 Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Thu 10/15
5:25 am-11:05 am
1 stop7h 40m
San Francisco
Tue 10/20
11:40 pm-5:50 am
Nonstop4h 10m
$247
Quickest round-trip
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Fri 11/6
6:00 am-8:44 am
Nonstop4h 44m
San Francisco
Thu 11/26
11:30 pm-5:47 am
Nonstop4h 17m
$247
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Wed 11/4
12:27 pm-5:15 pm
1 stop6h 48m
San Francisco
Thu 11/26
6:00 am-3:19 pm
1 stop7h 19m
$257
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Sat 9/19
9:29 am-2:06 pm
1 stop6h 37m
San Francisco
Tue 9/22
10:59 pm-9:07 am
1 stop8h 08m
$257
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Wed 9/23
1:40 pm-6:45 pm
1 stop7h 05m
San Francisco
Mon 9/28
7:55 pm-5:40 am
1 stop7h 45m
$257
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Wed 9/9
9:59 am-5:18 pm
1 stop9h 19m
San Francisco
Sat 9/12
11:33 am-10:44 pm
1 stop9h 11m
$277
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Mon 9/14
5:00 am-7:41 am
Nonstop4h 41m
San Francisco
Sun 9/20
12:35 am-6:56 am
Nonstop4h 21m
$278
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Wed 9/23
2:35 pm-5:23 pm
Nonstop4h 48m
San Francisco
Sun 9/27
11:30 pm-5:59 am
Nonstop4h 29m
$287
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Sun 9/13
6:00 am-8:38 am
Nonstop4h 38m
San Francisco
Mon 9/14
11:30 pm-5:59 am
Nonstop4h 29m
$287
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Wed 11/4
6:00 am-8:47 am
Nonstop4h 47m
San Francisco
Mon 11/23
12:55 am-7:13 am
Nonstop4h 18m
$291
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to San Francisco
Have a flexible travel schedule? Discover the best time to fly to San Francisco from Illinois with our price prediction graph.
MDW-SFO
ORD-SFO
PIA-SFO
STL-SFO
MLI-SFO
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to San Francisco
USIL-SFO
MDW-SFO
ORD-SFO
PIA-SFO
STL-SFO
What is the cheapest month to book a flight from Illinois to San Francisco?
Currently, September is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $342). Flying from Illinois to San Francisco in June is currently the most expensive (average of $476). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IL to SFO?
Find hourly flight availability from Illinois to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 22, 2026.
It’s optimal to fly from Illinois to San Francisco in the evening. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the afternoon.
Weekly flight availability from Illinois to San Francisco
Explore weekly flight availability from Illinois to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 22, 2026.
The most flights from USIL to SFO are scheduled on a Friday (90 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (47 on average).
How much does it cost to fly round-trip from Illinois to San Francisco?
Airfare is below average for this route at the moment.
Illinois to San Francisco flights typically cost between $302 and $545 in November.The cheapest round-trip price found within the last 5 days was $244 on Multiple Airlines (Nov 18-Dec 1).
How far ahead should I book a flight from Illinois to San Francisco?
Booking 63 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 August 15, 2026.
Travelers seeking maximum savings on their Illinois to San Francisco flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Clara
Santa Cruz
Walnut Creek
San Bruno
Emeryville
Roseville
Burlingame
Rancho Cordova
Fairfield
Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
San Carlos
Turlock
San Lorenzo
Browse thousands of different 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
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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 August 22, 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 August 22, 2026.
Illinois to San Francisco flights
Consider these flights traveling from Illinois to San Francisco.
Top 7 airlines flying from Illinois to San Francisco
Discover the top 7 airlines that operate flights from Illinois to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$136 | Average$258 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$159 | Average$308 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$409 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$478 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$230 | Average$332 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$449 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$257 | Average$398 | FlexibilityNo cancel fee | On-time63% |