$108+ Cheap flights from San Francisco (SFO) to Illinois
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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Sep 3 — Sep 101
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
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 San Francisco to Illinois
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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 August 4, 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 August 4, 2026.
This Frontier deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/211:58 pm -
1 stop10h 01m
Mon 10/512:54 pm -
1 stop11h 34m
Deal found 8/3![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 10/156:22 am -
1 stop11h 51m
Sun 10/189:33 pm -
1 stop12h 50m
Deal found 8/2![Multiple Airlines logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/2510:01 am -
1 stop8h 14m
Mon 8/317:05 am -
2 stops13h 40m
Deal found 8/1![Frontier logo]()
$281
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/166:00 pm -
1 stop8h 30m
Tue 9/2210:30 am -
2 stops7h 30m
Deal found 8/3![Southwest logo]()
$282
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 9/252:28 pm -
1 stop13h 10m
Sun 9/276:30 am -
1 stop6h 17m
Deal found 8/1![Frontier logo]()
$282
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/3010:35 pm -
1 stop10h 20m
Tue 9/111:50 am -
1 stop9h 13m
Deal found 8/1![Frontier logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/2711:00 am -
1 stop7h 45m
Sun 8/309:35 pm -
1 stop21h 01m
Deal found 8/3![Multiple Airlines logo]()
$283
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/89:00 pm -
1 stop6h 35m
Tue 11/1011:06 am -
1 stop7h 51m
Deal found 7/31![Frontier logo]()
$283
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:35 pm -
1 stop10h 15m
Mon 8/2411:50 am -
1 stop9h 13m
Deal found 8/1![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/1912:29 am -
1 stop13h 31m
Sat 8/222:41 pm -
1 stop11h 37m
Deal found 8/1![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” 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 10/910:48 pm -
1 stop10h 10m
Tue 10/1312:03 pm -
2 stops27h 18m
Deal found 8/4![Frontier logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/241:07 pm -
2 stops46h 29m
Fri 8/287:05 am -
1 stop13h 58m
Deal found 8/1![Frontier logo]()
$285
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 August 4, 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 August 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 10/156:22 am -
1 stop11h 51m
Sun 10/189:33 pm -
1 stop12h 50m
Deal found 8/2![Multiple Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/166:00 pm -
1 stop8h 30m
Wed 9/233:10 pm -
2 stops8h 00m
Deal found 8/2![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/55:00 am -
Nonstop4h 25m
Tue 9/89:40 pm -
Nonstop4h 50m
Deal found 8/2![United Airlines logo]()
$320
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 1/1312:40 am -
1 stop6h 09m
Mon 1/185:35 pm -
1 stop8h 24m
Deal found 8/3![Delta logo]()
$321
This American Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/276:36 am -
1 stop7h 26m
Sun 8/306:00 am -
1 stop7h 26m
Deal found 8/3![American Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/89:13 pm -
2 stops17h 57m
Thu 9/176:29 am -
2 stops12h 53m
Deal found 8/2![Alaska Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/2711:00 am -
1 stop7h 45m
Sun 8/309:35 pm -
1 stop13h 08m
Deal found 8/3![Multiple Airlines logo]()
$284
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/2511:40 pm -
Nonstop4h 10m
Sat 9/2610:30 am -
Nonstop4h 30m
Deal found 7/30![Southwest logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 10/2010:13 am -
1 stop25h 04m
Fri 10/2312:17 pm -
1 stop22h 25m
Deal found 8/2![Multiple Airlines logo]()
$290
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 1/1312:40 am -
1 stop6h 03m
Mon 1/187:00 am -
1 stop11h 02m
Deal found 8/3![Delta logo]()
$321
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/2112:35 am -
Nonstop4h 21m
Sun 10/256:00 am -
Nonstop4h 44m
Deal found 7/31![United Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/211:40 pm -
Nonstop4h 10m
Mon 10/58:25 pm -
1 stop6h 15m
Deal found 7/31![Southwest logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/2011:00 am -
1 stop7h 45m
Sun 8/239:35 pm -
1 stop13h 08m
Deal found 8/3![Multiple Airlines logo]()
$295
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/712:35 am -
Nonstop4h 21m
Tue 10/139:40 pm -
Nonstop4h 50m
Deal found 7/31![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 11/611:35 pm -
Nonstop4h 25m
Mon 11/912:45 pm -
2 stops9h 25m
Deal found 8/1![Southwest logo]()
$312
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/2010:32 am -
1 stop6h 49m
Mon 8/248:17 pm -
1 stop14h 29m
Deal found 8/3![Alaska Airlines logo]()
$379
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/810:06 pm -
1 stop11h 21m
Sun 10/119:33 pm -
1 stop12h 50m
Deal found 8/3![Multiple Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/28:59 pm -
2 stops9h 38m
Wed 9/95:46 pm -
1 stop8h 11m
Deal found 8/2![Delta logo]()
$373
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/112:00 pm -
Nonstop4h 35m
Sat 9/53:35 pm -
Nonstop4h 49m
Deal found 8/3![United Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/265:40 am -
2 stops9h 30m
Fri 8/2812:05 pm -
1 stop7h 30m
Deal found 7/31![Southwest logo]()
$322
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/145:30 am -
1 stop8h 23m
Mon 8/174:43 pm -
1 stop7h 35m
Deal found 7/30![American Airlines logo]()
$449
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/2210:06 pm -
1 stop11h 21m
Sun 10/258:53 pm -
1 stop28h 58m
Deal found 7/31![Multiple Airlines logo]()
$308
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/158:20 am -
2 stops13h 39m
Mon 10/197:02 am -
1 stop9h 21m
Deal found 8/3![Alaska Airlines logo]()
$424
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” 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 9/2511:30 pm -
1 stop9h 48m
Mon 9/284:32 pm -
1 stop9h 25m
Deal found 8/4![Delta logo]()
$389
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 1/76:05 am -
Nonstop4h 00m
Sun 1/107:50 pm -
Nonstop4h 50m
Deal found 7/30![Southwest logo]()
$327
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/2712:00 pm -
Nonstop3h 59m
Sat 8/294:40 pm -
1 stop8h 15m
Deal found 7/30![United Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/3011:58 pm -
2 stops18h 15m
Sun 10/119:33 pm -
1 stop12h 50m
Deal found 7/30![Multiple Airlines logo]()
$321
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/107:03 am -
1 stop9h 50m
Tue 10/137:00 am -
1 stop15h 17m
Deal found 8/3![Alaska Airlines logo]()
$435
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/112:20 pm -
1 stop7h 30m
Sun 10/49:30 pm -
Nonstop4h 40m
Deal found 7/30![Southwest logo]()
$328
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/712:35 am -
Nonstop4h 21m
Sun 10/116:07 am -
Nonstop4h 38m
Deal found 8/3![United Airlines logo]()
$367
Last-minute flights from San Francisco to IllinoisDiscover last-minute flight deals from San Francisco to Illinois. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Illinois. Data last updated August 4, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/114:30 pm -
1 stop11h 07m
Fri 8/217:05 am -
1 stop13h 58m
Deal found 7/31![Frontier logo]()
$286
This Frontier deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/156:00 am -
1 stop12h 52m
Mon 8/242:41 pm -
1 stop11h 37m
Deal found 8/3![Frontier logo]()
$283
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/1912:29 am -
1 stop13h 31m
Sat 8/222:41 pm -
1 stop11h 37m
Deal found 8/1![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/1910:35 pm -
1 stop10h 20m
Fri 8/2111:50 am -
1 stop9h 13m
Deal found 7/31![Frontier logo]()
$286
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:35 pm -
1 stop10h 15m
Mon 8/2411:50 am -
1 stop9h 13m
Deal found 8/1![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/241:07 pm -
2 stops46h 29m
Fri 8/287:05 am -
1 stop13h 58m
Deal found 8/1![Frontier logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/2510:01 am -
1 stop8h 14m
Mon 8/317:05 am -
2 stops13h 40m
Deal found 8/1![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 8/2711:00 am -
1 stop7h 45m
Sun 8/309:35 pm -
1 stop21h 01m
Deal found 8/3![Multiple Airlines logo]()
$283
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/3010:35 pm -
1 stop10h 20m
Tue 9/111:50 am -
1 stop9h 13m
Deal found 8/1![Frontier logo]()
$283
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/165:40 am -
2 stops9h 30m
Wed 9/231:40 pm -
1 stop7h 05m
Deal found 8/3![Southwest logo]()
$282
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/165:40 am -
2 stops9h 30m
Tue 9/223:10 pm -
2 stops8h 00m
Deal found 8/3![Southwest logo]()
$287
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 9/252:28 pm -
1 stop13h 10m
Sun 9/276:30 am -
1 stop6h 17m
Deal found 8/1![Frontier logo]()
$282
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 August 4, 2026.
Search for one-way flight options from San Francisco to Illinois. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/19:00 am -
2 stops32h 17m
Deal found 7/30![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/2911:17 am -
2 stops30h 00m
Deal found 7/30![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/104:31 pm -
2 stops48h 46m
Deal found 8/2![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/119:00 am -
2 stops32h 17m
Deal found 8/2![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 10/24:31 pm -
2 stops24h 46m
Deal found 7/30![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:00 am -
2 stops25h 07m
Deal found 8/2![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/299:18 am -
2 stops31h 57m
Deal found 7/31![Frontier logo]()
$123
This Priceline deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3011:42 am -
1 stop5h 35m
Deal found 7/30![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/166:04 am -
1 stop11h 13m
Deal found 8/2![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/2810:24 pm -
2 stops17h 22m
Deal found 8/3![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” 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.
Sun 9/2710:24 pm -
2 stops23h 59m
Deal found 8/4![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/210:24 pm -
2 stops17h 27m
Deal found 8/3![Frontier logo]()
$152
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 August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $281 (Frontier) |
One-way from | $108 (Kiwi.com) |
Popular in | July |
Cheapest in | September |
Average price | $397 |
Good round-trip deal | $354 or less |
Good one-way deal | $208 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 2,558,603 searches. Data last updated August 4, 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 - RFD
SFORFD
San Francisco
Thu 10/15
6:22 am-8:13 pm
1 stop11h 51m
Chicago Greater Rockford
Sun 10/18
9:33 pm-8:23 am
1 stop12h 50m
$281
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Wed 9/16
6:00 pm-4:30 am
1 stop8h 30m
Chicago Midway
Wed 9/23
3:10 pm-9:10 pm
2 stops8h 00m
$282
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Thu 8/27
11:00 am-8:45 pm
1 stop7h 45m
Chicago Greater Rockford
Sun 8/30
9:35 pm-8:43 am
1 stop13h 08m
$284
Quickest round-trip
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Fri 9/25
11:40 pm-5:50 am
Nonstop4h 10m
Chicago Midway
Sat 9/26
10:30 am-1:00 pm
Nonstop4h 30m
$287
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Tue 10/20
10:13 am-1:17 pm
1 stop25h 04m
Chicago Greater Rockford
Fri 10/23
12:17 pm-8:42 am
1 stop22h 25m
$290
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Thu 8/20
11:00 am-8:45 pm
1 stop7h 45m
Chicago Greater Rockford
Sun 8/23
9:35 pm-8:43 am
1 stop13h 08m
$295
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Thu 10/8
10:06 pm-11:27 am
1 stop11h 21m
Chicago Greater Rockford
Sun 10/11
9:33 pm-8:23 am
1 stop12h 50m
$301
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Fri 10/2
11:40 pm-5:50 am
Nonstop4h 10m
Chicago Midway
Mon 10/5
8:25 pm-12:40 am
1 stop6h 15m
$307
San FranciscoChicago
SFO - RFD
SFORFD
San Francisco
Thu 10/22
10:06 pm-11:27 am
1 stop11h 21m
Chicago Greater Rockford
Sun 10/25
8:53 pm-11:51 pm
1 stop28h 58m
$308
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Fri 11/6
11:35 pm-6:00 am
Nonstop4h 25m
Chicago Midway
Mon 11/9
12:45 pm-8:10 pm
2 stops9h 25m
$312
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-STL
SFO-MDW
SFO-ORD
SFO-RFD
SFO-SPI
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-STL
SFO-MDW
SFO-ORD
SFO-RFD
What is the cheapest month to book a flight from San Francisco to Illinois?
Currently, September is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $345). 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 August 4, 2026.
It’s optimal to fly from San Francisco to Illinois in the evening. By choosing this option you can save up to 11% 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 August 4, 2026.
The most flights from SFO to USIL are scheduled on a Monday (86 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 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 $308 and $499 in August.The cheapest round-trip price found within the last 5 days was $281 on Frontier (Aug 25-Aug 31).
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 August 1, 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 August 4, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited 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.
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Overall
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.
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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 August 4, 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 2,558,603 searches. Data last updated August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$122 | Average$387 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$146 | Average$283 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$195 | Average$382 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$222 | Average$530 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$224 | Average$298 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$252 | Average$506 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$266 | Average$432 | FlexibilityNo cancel fee | On-time63% |