$124+ Cheap flights from Illinois to San Francisco (SFO)
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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Oct 22 — Oct 291
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 September 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 September 22, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:01 pm -
1 stop15h 53m
Fri 10/167:25 pm -
1 stop9h 09m
Deal found 9/19![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/36:30 am -
1 stop6h 47m
Mon 11/911:52 pm -
1 stop7h 43m
Deal found 9/18![Frontier logo]()
$249
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:01 pm -
1 stop26h 37m
Fri 10/3011:06 am -
1 stop16h 07m
Deal found 9/19![Frontier logo]()
$250
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:25 pm -
Nonstop4h 55m
Tue 12/111:35 pm -
Nonstop4h 25m
Deal found 9/17![Southwest logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/176:30 am -
2 stops16h 02m
Thu 11/263:41 pm -
1 stop7h 12m
Deal found 9/18![Frontier logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:30 am -
1 stop6h 35m
Mon 10/2611:59 pm -
1 stop7h 36m
Deal found 9/19![Frontier logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 9/20. 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 10/168:01 pm -
1 stop26h 37m
Wed 11/1810:17 pm -
1 stop8h 39m
Deal found 9/20![Frontier logo]()
$253
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:22 am -
1 stop13h 33m
Fri 10/2311:59 pm -
1 stop12h 36m
Deal found 9/17![Frontier logo]()
$254
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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 11/56:30 am -
1 stop19h 50m
Thu 11/1211:06 am -
1 stop16h 07m
Deal found 9/19![Frontier logo]()
$254
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:00 am -
1 stop13h 55m
Tue 10/207:25 pm -
1 stop9h 09m
Deal found 9/19![Frontier logo]()
$255
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/31:20 pm -
2 stops10h 00m
Sat 11/711:20 am -
1 stop9h 35m
Deal found 9/18![Southwest logo]()
$256
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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.
Sat 10/108:01 pm -
1 stop15h 53m
Sun 10/188:58 am -
1 stop19h 36m
Deal found 9/19![Frontier logo]()
$256
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 September 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 September 22, 2026.
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:55 pm -
Nonstop4h 45m
Thu 10/155:35 am -
Nonstop4h 10m
Deal found 9/18![Southwest logo]()
$337
This United Airlines deal was found by Cheapflights users on 9/20. 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.
Mon 10/198:09 pm -
Nonstop4h 50m
Sat 2/2011:30 pm -
Nonstop4h 17m
Deal found 9/20![United Airlines logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 9/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:00 am -
2 stops12h 00m
Mon 11/28:20 am -
1 stop8h 39m
Deal found 9/18![Alaska Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 9/21. 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.
Fri 10/235:30 pm -
1 stop8h 26m
Tue 10/276:38 pm -
2 stops12h 15m
Deal found 9/21![Delta logo]()
$358
This American Airlines deal was found by Cheapflights users on 9/21. 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.
Tue 10/63:58 pm -
1 stop9h 08m
Sat 10/103:18 pm -
1 stop6h 41m
Deal found 9/21![American Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 9/21. 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
Mon 11/911:35 pm -
Nonstop4h 25m
Deal found 9/21![Southwest logo]()
$337
This United Airlines deal was found by Cheapflights users on 9/21. 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 10/306:00 am -
Nonstop4h 44m
Mon 11/26:42 pm -
Nonstop4h 17m
Deal found 9/21![United Airlines logo]()
$350
This Delta deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:00 am -
1 stop8h 42m
Sat 10/3111:59 pm -
1 stop9h 19m
Deal found 9/20![Delta logo]()
$361
This Southwest deal was found by Cheapflights users on 9/21. 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.
Wed 10/2110:00 am -
Nonstop4h 45m
Wed 10/2811:40 pm -
Nonstop4h 10m
Deal found 9/21![Southwest logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 9/21. 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 10/307:49 pm -
1 stop15h 48m
Sun 11/18:20 am -
1 stop8h 39m
Deal found 9/21![Alaska Airlines logo]()
$390
This Delta deal was found by Cheapflights users on 9/21. 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.
Fri 10/165:04 pm -
1 stop8h 52m
Sat 10/246:00 am -
1 stop8h 29m
Deal found 9/21![Delta logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/19. 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.
Fri 11/206:00 am -
Nonstop4h 44m
Fri 11/276:42 pm -
Nonstop4h 17m
Deal found 9/19![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 9/20. 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.
Tue 10/1312:15 pm -
1 stop10h 05m
Mon 10/195:35 am -
Nonstop4h 10m
Deal found 9/20![Southwest logo]()
$347
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:04 pm -
1 stop8h 52m
Tue 10/2010:25 pm -
1 stop9h 53m
Deal found 9/17![Delta logo]()
$370
This Southwest deal was found by Cheapflights users on 9/19. 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 12/108:05 am -
1 stop7h 55m
Mon 12/146:00 am -
Nonstop4h 15m
Deal found 9/19![Southwest logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 9/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/217:58 pm -
1 stop14h 54m
Sat 1/27:29 pm -
1 stop9h 11m
Deal found 9/22![Alaska Airlines logo]()
$440
This Delta deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:27 pm -
1 stop6h 50m
Mon 11/210:25 pm -
1 stop10h 18m
Deal found 9/19![Delta logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/20. 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.
Tue 10/66:15 am -
1 stop7h 10m
Sat 10/1012:35 am -
1 stop7h 31m
Deal found 9/20![United Airlines logo]()
$414
This Southwest deal was found by Cheapflights users on 9/21. 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 11/179:55 am -
Nonstop4h 50m
Wed 12/25:05 am -
1 stop7h 55m
Deal found 9/21![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/77:03 pm -
1 stop7h 27m
Sat 10/107:10 am -
1 stop8h 55m
Deal found 9/20![American Airlines logo]()
$510
This Delta deal was found by Cheapflights users on 9/21. 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 10/214:26 pm -
1 stop8h 33m
Mon 10/2611:30 pm -
1 stop9h 56m
Deal found 9/21![Delta logo]()
$379
This American Airlines deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:48 pm -
1 stop7h 42m
Sat 10/176:00 am -
1 stop6h 56m
Deal found 9/22![American Airlines logo]()
$510
This Southwest deal was found by Cheapflights users on 9/20. 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.
Thu 10/159:25 pm -
Nonstop4h 45m
Wed 10/216:50 pm -
2 stops8h 50m
Deal found 9/20![Southwest logo]()
$352
This United Airlines deal was found by Cheapflights users on 9/20. 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.
Wed 10/76:15 am -
1 stop7h 10m
Sat 10/1012:35 am -
1 stop7h 31m
Deal found 9/20![United Airlines logo]()
$444
This American Airlines deal was found by Cheapflights users on 9/19. 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.
Mon 10/54:42 pm -
2 stops8h 55m
Sun 10/116:00 am -
1 stop8h 59m
Deal found 9/19![American Airlines logo]()
$516
This Southwest deal was found by Cheapflights users on 9/21. 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 11/199:05 pm -
Nonstop4h 50m
Fri 11/2711:35 pm -
Nonstop4h 25m
Deal found 9/21![Southwest logo]()
$360
This United Airlines deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/274:35 pm -
Nonstop4h 53m
Thu 10/296:35 am -
Nonstop4h 23m
Deal found 9/22![United Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 9/18. 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 10/1010:25 am -
1 stop9h 50m
Sat 10/176:20 am -
2 stops9h 40m
Deal found 9/18![Southwest logo]()
$362
This United Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/172:35 pm -
Nonstop5h 00m
Fri 1/112:55 am -
Nonstop4h 29m
Deal found 9/20![United Airlines logo]()
$450
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/276:23 am -
1 stop6h 37m
Tue 12/111:48 pm -
1 stop7h 16m
Deal found 9/18![Delta logo]()
$458
Last-minute flights from Illinois to San FranciscoDiscover last-minute flight deals from Illinois to San Francisco. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco. Data last updated September 22, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/76:30 am -
1 stop6h 28m
Tue 10/277:14 pm -
2 stops12h 21m
Deal found 9/18![Frontier logo]()
$249
This Mytrip deal was found by Cheapflights users on 9/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 am -
2 stops10h 29m
Wed 10/77:11 pm -
1 stop8h 06m
Deal found 9/18![Frontier logo]()
$251
This Cheapflightsfares deal was found by Cheapflights users on 9/19. 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.
Sat 10/108:01 pm -
1 stop15h 53m
Sun 10/188:58 am -
1 stop19h 36m
Deal found 9/19![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:00 am -
1 stop13h 55m
Tue 10/207:25 pm -
1 stop9h 09m
Deal found 9/19![Frontier logo]()
$255
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:01 pm -
1 stop15h 53m
Fri 10/167:25 pm -
1 stop9h 09m
Deal found 9/19![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 9/20. 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 10/168:01 pm -
1 stop26h 37m
Tue 11/1711:52 pm -
1 stop7h 43m
Deal found 9/20![Frontier logo]()
$253
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:01 pm -
1 stop26h 37m
Fri 10/3011:06 am -
1 stop16h 07m
Deal found 9/19![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:30 am -
1 stop6h 35m
Mon 10/2611:59 pm -
1 stop7h 36m
Deal found 9/19![Frontier logo]()
$252
This Super.com deal was found by Cheapflights users on 9/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/203:30 pm -
1 stop8h 55m
Tue 10/2711:52 pm -
1 stop9h 30m
Deal found 9/22![Frontier logo]()
$257
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:22 am -
1 stop13h 33m
Fri 10/2311:59 pm -
1 stop12h 36m
Deal found 9/17![Frontier logo]()
$254
This Cheapflightsfares deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:01 pm -
1 stop26h 37m
Thu 10/292:21 pm -
1 stop12h 52m
Deal found 9/18![Frontier logo]()
$254
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:05 pm -
1 stop6h 45m
Wed 10/286:50 pm -
2 stops8h 50m
Deal found 9/18![Southwest logo]()
$256
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 September 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 September 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/176:30 am -
2 stops16h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 9/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/143:30 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 9/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:30 am -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/213:30 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$127
This Cheapflightsfares deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:21 am -
1 stop7h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/176:16 am -
1 stop13h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 9/19. 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.
Mon 10/264:20 pm -
1 stop25h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$128
This Mytrip deal was found by Cheapflights users on 9/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:30 am -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$129
This Booking.com deal was found by Cheapflights users on 9/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/243:30 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$130
This Flightnetwork deal was found by Cheapflights users on 9/19. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:30 am -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$130
This CheapOair deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/103:30 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 9/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/166:21 am -
1 stop7h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$131
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 September 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $248 (Cheapflightsfares) |
One-way from | $124 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $337 |
Good round-trip deal | $297 or less |
Good one-way deal | $163 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 September 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
Wed 10/28
7:55 am-4:05 pm
2 stops10h 10m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$131
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Fri 10/30
12:27 pm-5:15 pm
1 stop6h 48m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$159
Quickest round-trip
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Mon 12/7
5:59 am-8:40 am
Nonstop4h 41m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Wed 10/21
10:00 am-12:45 pm
Nonstop4h 45m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Sat 10/10
4:05 pm-6:54 pm
Nonstop4h 49m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Thu 10/22
9:25 pm-12:10 am
Nonstop4h 45m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Fri 10/30
5:46 pm-2:22 pm
2 stops22h 36m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$172
ChicagoSan Francisco
ORD Chicago O'Hare Intl - SFO San Francisco
ORDSFO
Chicago O'Hare Intl
Mon 11/16
9:51 am-11:21 pm
2 stops15h 30m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$173
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Mon 12/21
6:30 pm-12:06 am
1 stop7h 36m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$179
ChicagoSan Francisco
MDW Chicago Midway - SFO San Francisco
MDWSFO
Chicago Midway
Sat 12/12
11:28 am-6:56 pm
1 stop9h 28m
San Francisco
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$179
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
BMI-SFO
MLI-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
BMI-SFO
MLI-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 $364). 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 September 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 September 22, 2026.
The most flights from USIL to SFO are scheduled on a Monday (97 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (28 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 $293 and $542 in October.The cheapest round-trip price found within the last 5 days was $248 on Frontier (Oct 14-Oct 16).
How far ahead should I book a flight from Illinois to San Francisco?
Booking 55 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 September 19, 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
Emeryville
Burlingame
Rancho Cordova
San Bruno
Roseville
Hayward
Cupertino
Newark
Fairfield
San Ramon
Redwood City
Manteca
Vallejo
San Carlos
Turlock
Davis
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Illinois to San Francisco
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Complete your trip
Complete your trip to San Francisco by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Francisco by cabin class
Find flights from Illinois to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Francisco flights
Browse other Illinois and San Francisco flight options. Last updated on September 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 September 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 September 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$110 | Average$272 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$159 | Average$310 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$205 | Average$392 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$236 | Average$478 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$243 | Average$332 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$255 | Average$468 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$257 | Average$400 | FlexibilityNo cancel fee | On-time63% |