$74+ Cheap flights from Illinois to San Francisco Bay Area
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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Mar 6 — Mar 131
1 adult, Economy
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Find cheap flights from Illinois to San Francisco Bay Area with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 Bay Area
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Cheapest flights from Illinois to San Francisco Bay AreaExplore the most affordable flight options available from Illinois to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.
Explore the most affordable flight options available from Illinois to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/68:12 pm
STL
- SFO
1 stop23h 36m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/3![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/254:51 pm
STL
- SFO
1 stop9h 37m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/4![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Tue 3/33:49 pm
STL
- SFO
2 stops41h 31m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/3![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Mon 2/238:22 pm
STL
- SFO
1 stop27h 17m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/4![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/188:17 pm
STL
- SFO
1 stop27h 22m
Frontier
Wed 2/257:20 am
SFO
- STL
1 stop6h 33m
Frontier
Deal found 2/4![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/254:51 pm
STL
- SFO
1 stop9h 37m
Frontier
Wed 3/47:15 pm
SFO
- STL
1 stop24h 11m
Frontier
Deal found 2/4![Frontier logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/45:15 am
ORD
- SJC
2 stops38h 29m
Multiple Airlines
Mon 3/98:20 pm
SJC
- ORD
1 stop7h 48m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$190
This Frontier deal was found by Cheapflights users on 2/3. 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.
Thu 4/168:12 pm
STL
- SFO
1 stop6h 10m
Frontier
Sat 4/186:00 am
SFO
- STL
1 stop11h 12m
Frontier
Deal found 2/3![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/308:12 pm
STL
- SFO
1 stop25h 57m
Frontier
Tue 4/79:00 pm
SFO
- STL
1 stop10h 48m
Frontier
Deal found 2/3![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Mon 3/28:22 pm
STL
- SFO
2 stops27h 39m
Frontier
Mon 3/99:24 pm
SFO
- STL
1 stop19h 47m
Frontier
Deal found 2/2![Frontier logo]()
$192
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 4/74:10 pm
ORD
- STS
1 stop9h 03m
Alaska Airlines
Tue 4/147:00 am
STS
- ORD
1 stop9h 40m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$197
This CheapOair deal was found by Cheapflights users on 2/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:52 pm
ORD
- OAK
1 stop8h 31m
Alaska Airlines
Sat 5/96:46 am
OAK
- ORD
1 stop10h 17m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$197
Best flights from Illinois to San Francisco Bay AreaDiscover carefully curated flight deals from Illinois to San Francisco Bay Area that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 4, 2026.
Discover carefully curated flight deals from Illinois to San Francisco Bay Area that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 4, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 4/144:10 pm
ORD
- STS
1 stop9h 03m
Alaska Airlines
Wed 4/157:00 am
STS
- ORD
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 2/3. 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.
Tue 2/2411:10 am
MDW
- OAK
Nonstop4h 55m
Southwest
Sat 2/286:40 am
OAK
- MDW
Nonstop4h 05m
Southwest
Deal found 2/3![Southwest logo]()
$217
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 7/2812:10 pm
STL
- SFO
1 stop7h 58m
Delta
Sat 8/110:30 pm
SFO
- STL
1 stop7h 37m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 am
STL
- SJC
1 stop8h 00m
United Airlines
Sat 5/1612:56 pm
SJC
- STL
1 stop7h 34m
United Airlines
Deal found 2/4![United Airlines logo]()
$237
This American Airlines deal was found by Cheapflights users on 2/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:20 am
STL
- SJC
1 stop6h 50m
American Airlines
Sat 5/1612:46 pm
SJC
- STL
2 stops8h 13m
American Airlines
Deal found 2/4![American Airlines logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 4/164:10 pm
ORD
- STS
1 stop9h 03m
Alaska Airlines
Sat 4/187:00 am
STS
- ORD
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$223
This Southwest deal was found by Cheapflights users on 2/2. 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.
Tue 2/245:35 pm
MDW
- OAK
1 stop6h 40m
Southwest
Sat 3/145:40 am
OAK
- MDW
Nonstop4h 00m
Southwest
Deal found 2/2![Southwest logo]()
$227
This Delta deal was found by Cheapflights users on 2/4. 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.
Wed 4/156:45 pm
STL
- SFO
1 stop7h 14m
Delta
Mon 4/279:35 pm
SFO
- STL
1 stop8h 55m
Delta
Deal found 2/4![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 4/164:10 pm
ORD
- STS
1 stop9h 03m
Alaska Airlines
Fri 4/177:00 am
STS
- ORD
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$223
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Mon 3/99:15 pm
ORD
- SFO
Nonstop5h 01m
United Airlines
Fri 3/136:44 pm
SFO
- ORD
Nonstop4h 15m
United Airlines
Deal found 2/3![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 2/3. 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.
Fri 5/19:50 pm
MDW
- OAK
Nonstop4h 35m
Southwest
Mon 5/44:05 pm
OAK
- MDW
1 stop5h 50m
Southwest
Deal found 2/3![Southwest logo]()
$227
This Delta deal was found by Cheapflights users on 2/3. 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 7/293:42 pm
STL
- SFO
1 stop9h 07m
Delta
Sat 8/110:30 pm
SFO
- STL
1 stop7h 37m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/2. 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.
Wed 2/256:25 am
ORD
- SFO
Nonstop5h 02m
United Airlines
Mon 3/211:59 pm
SFO
- ORD
Nonstop4h 20m
United Airlines
Deal found 2/2![United Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 2/3. 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.
Mon 5/187:59 pm
STL
- SFO
1 stop5h 58m
Delta
Sun 5/246:00 am
SFO
- STL
1 stop5h 32m
Delta
Deal found 2/3![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Mon 4/137:59 pm
ORD
- STS
1 stop16h 04m
Alaska Airlines
Wed 4/157:00 am
STS
- ORD
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$245
This Southwest deal was found by Cheapflights users on 2/3. 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.
Fri 4/179:50 pm
MDW
- OAK
Nonstop4h 35m
Southwest
Sun 4/1911:55 pm
OAK
- MDW
Nonstop4h 05m
Southwest
Deal found 2/3![Southwest logo]()
$248
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 5/127:59 pm
STL
- SFO
1 stop5h 58m
Delta
Wed 5/204:59 pm
SFO
- STL
1 stop5h 31m
Delta
Deal found 2/3![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 1/31. 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 4/159:00 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Sun 4/1911:25 pm
SFO
- MDW
Nonstop4h 15m
Southwest
Deal found 1/31![Southwest logo]()
$250
This Alaska Airlines deal was found by Cheapflights users on 2/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/38:20 am
ORD
- SJC
1 stop7h 53m
Alaska Airlines
Tue 3/1010:24 am
SJC
- ORD
1 stop26h 34m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$253
This United Airlines deal was found by Cheapflights users on 2/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/239:15 pm
ORD
- SFO
Nonstop5h 01m
United Airlines
Mon 3/3011:52 pm
SFO
- ORD
Nonstop4h 28m
United Airlines
Deal found 2/1![United Airlines logo]()
$283
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 5/127:59 pm
STL
- SJC
1 stop5h 43m
Delta
Tue 5/195:00 pm
SJC
- STL
1 stop5h 30m
Delta
Deal found 2/3![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 1/31. 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 4/159:00 pm
MDW
- SFO
Nonstop4h 35m
Southwest
Fri 4/175:15 am
SFO
- MDW
Nonstop4h 10m
Southwest
Deal found 1/31![Southwest logo]()
$250
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 4/188:20 am
ORD
- STS
1 stop13h 00m
Alaska Airlines
Tue 4/217:00 am
STS
- ORD
1 stop9h 40m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 5/127:59 pm
STL
- SJC
1 stop5h 43m
Delta
Wed 5/205:00 pm
SJC
- STL
1 stop5h 30m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Mon 3/28:20 pm
ORD
- SFO
Nonstop5h 04m
United Airlines
Fri 3/136:44 pm
SFO
- ORD
Nonstop4h 15m
United Airlines
Deal found 2/3![United Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 1/31. 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.
Sat 4/186:00 am
MDW
- SFO
1 stop6h 25m
Southwest
Tue 4/282:50 pm
SFO
- MDW
1 stop6h 30m
Southwest
Deal found 1/31![Southwest logo]()
$254
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 4/48:20 am
ORD
- STS
1 stop13h 00m
Alaska Airlines
Tue 4/147:00 am
STS
- ORD
1 stop9h 40m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 2/3. 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.
Thu 4/97:10 pm
ORD
- OAK
1 stop6h 36m
Delta
Thu 4/1612:34 pm
OAK
- ORD
1 stop6h 44m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Sun 3/86:17 am
ORD
- SFO
Nonstop5h 05m
United Airlines
Sun 3/810:45 pm
SFO
- ORD
Nonstop4h 22m
United Airlines
Deal found 2/3![United Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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 4/48:20 am
ORD
- STS
1 stop13h 00m
Alaska Airlines
Wed 4/157:00 am
STS
- ORD
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$255
Last-minute flights from Illinois to San Francisco Bay AreaDiscover last-minute flight deals from Illinois to San Francisco Bay Area. Data last updated February 4, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to San Francisco Bay Area. Data last updated February 4, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/188:17 pm
STL
- SFO
1 stop27h 22m
Frontier
Wed 2/257:20 am
SFO
- STL
1 stop6h 33m
Frontier
Deal found 2/4![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Mon 2/238:22 pm
STL
- SFO
1 stop27h 17m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/4![Frontier logo]()
$172
This Frontier deal was found by Cheapflights users on 2/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/231:54 pm
STL
- SFO
1 stop12h 34m
Frontier
Wed 2/257:20 am
SFO
- STL
1 stop6h 33m
Frontier
Deal found 2/2![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/254:51 pm
STL
- SFO
1 stop9h 37m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/4![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 2/254:51 pm
STL
- SFO
1 stop9h 37m
Frontier
Wed 3/47:15 pm
SFO
- STL
1 stop24h 11m
Frontier
Deal found 2/4![Frontier logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Mon 3/28:22 pm
STL
- SFO
2 stops27h 39m
Frontier
Mon 3/99:24 pm
SFO
- STL
1 stop19h 47m
Frontier
Deal found 2/2![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Tue 3/33:49 pm
STL
- SFO
2 stops41h 31m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/3![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/36:02 pm
ORD
- SJC
2 stops41h 37m
Frontier
Mon 3/98:20 pm
SJC
- ORD
1 stop7h 48m
Frontier
Deal found 2/1![Frontier logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/45:15 am
ORD
- SJC
2 stops38h 29m
Multiple Airlines
Mon 3/98:20 pm
SJC
- ORD
1 stop7h 48m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$190
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Wed 3/43:07 pm
ORD
- SJC
1 stop9h 49m
Alaska Airlines
Tue 3/1012:45 pm
SJC
- ORD
1 stop9h 14m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/68:12 pm
STL
- SFO
1 stop23h 36m
Frontier
Tue 3/109:04 pm
SFO
- STL
1 stop10h 45m
Frontier
Deal found 2/3![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/308:12 pm
STL
- SFO
1 stop25h 57m
Frontier
Tue 4/79:00 pm
SFO
- STL
1 stop10h 48m
Frontier
Deal found 2/3![Frontier logo]()
$191
One-way flights from Illinois to San Francisco Bay AreaSearch for one-way flight options from Illinois to San Francisco Bay Area. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
Search for one-way flight options from Illinois to San Francisco Bay Area. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/68:12 pm
STL
- SFO
1 stop23h 36m
Frontier
Deal found 2/3![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 2/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- SFO
1 stop19h 12m
Frontier
Deal found 2/4![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Wed 4/298:53 pm
ORD
- SJC
1 stop23h 09m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$81
This Trip.com deal was found by Cheapflights users on 2/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- SFO
1 stop9h 37m
Frontier
Deal found 2/2![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 2/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
- SFO
1 stop11h 37m
Frontier
Deal found 2/2![Frontier logo]()
$88
This Expedia deal was found by Cheapflights users on 2/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2310:11 pm
STL
- SFO
1 stop22h 09m
Frontier
Deal found 2/2![Frontier logo]()
$90
This Southwest deal was found by Cheapflights users on 2/2. 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.
Sat 3/149:40 pm
MDW
- OAK
Nonstop4h 40m
Southwest
Deal found 2/2![Southwest logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Mon 3/28:22 pm
STL
- SFO
2 stops27h 39m
Frontier
Deal found 2/2![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 2/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2412:14 pm
STL
- SFO
1 stop8h 23m
Frontier
Deal found 2/3![Frontier logo]()
$94
This Mytrip deal was found by Cheapflights users on 2/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1112:14 pm
STL
- SFO
1 stop8h 23m
Frontier
Deal found 2/3![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Mon 3/238:12 pm
STL
- SFO
1 stop30h 16m
Frontier
Deal found 2/2![Frontier logo]()
$97
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 3/244:10 pm
ORD
- STS
1 stop9h 03m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$99
Find flight deals from Illinois to San Francisco Bay Area
Keep the following information in mind while searching for Illinois to San Francisco Bay Area flight deals. Data was last updated February 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Kiwi.com) |
One-way from | $74 (Kiwi.com) |
Popular in | December |
Cheapest in | July |
Average price | $315 |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to San Francisco Bay Area 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 February 4, 2026.
Use the filters below to find and compare flights from Illinois to San Francisco Bay Area that are best for you.
Fly from
Illinois
Fly to
San Francisco Bay Area
Route
Depart
Return
Price
ChicagoSanta Rosa
ORD - STS
ORDSTS
Chicago O'Hare Intl
Tue 4/14
4:10 pm-11:13 pm
1 stop9h 03m
Santa Rosa Sonoma County
Wed 4/15
7:00 am-7:02 pm
1 stop10h 02m
$197
ChicagoOakland
MDW - OAK
MDWOAK
Chicago Midway
Tue 2/24
11:10 am-2:05 pm
Nonstop4h 55m
Oakland
Sat 2/28
6:40 am-12:45 pm
Nonstop4h 05m
$217
ChicagoSanta Rosa
ORD - STS
ORDSTS
Chicago O'Hare Intl
Thu 4/16
4:10 pm-11:13 pm
1 stop9h 03m
Santa Rosa Sonoma County
Sat 4/18
7:00 am-7:02 pm
1 stop10h 02m
$223
ChicagoSanta Rosa
ORD - STS
ORDSTS
Chicago O'Hare Intl
Thu 4/16
4:10 pm-11:13 pm
1 stop9h 03m
Santa Rosa Sonoma County
Fri 4/17
7:00 am-7:02 pm
1 stop10h 02m
$223
ChicagoOakland
MDW - OAK
MDWOAK
Chicago Midway
Tue 2/24
5:35 pm-10:15 pm
1 stop6h 40m
Oakland
Sat 3/14
5:40 am-11:40 am
Nonstop4h 00m
$227
ChicagoOakland
MDW - OAK
MDWOAK
Chicago Midway
Fri 5/1
9:50 pm-12:25 am
Nonstop4h 35m
Oakland
Mon 5/4
4:05 pm-11:55 pm
1 stop5h 50m
$227
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
Tue 7/28
12:10 pm-6:08 pm
1 stop7h 58m
San Francisco
Sat 8/1
10:30 pm-8:07 am
1 stop7h 37m
$237
St. LouisSan Jose
STL - SJC
STLSJC
Lambert-St Louis
Wed 5/6
6:00 am-12:00 pm
1 stop8h 00m
San Jose
Sat 5/16
12:56 pm-10:30 pm
1 stop7h 34m
$237
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
Wed 4/15
6:45 pm-11:59 pm
1 stop7h 14m
San Francisco
Mon 4/27
9:35 pm-8:30 am
1 stop8h 55m
$237
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
Wed 7/29
3:42 pm-10:49 pm
1 stop9h 07m
San Francisco
Sat 8/1
10:30 pm-8:07 am
1 stop7h 37m
$237
Showing 1-10 of 60 results
Best time to book a flight from Illinois to San Francisco Bay Area
Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area from Illinois with our price prediction graph.
STL-SFO
ORD-SJC
MDW-OAK
ORD-STS
ORD-OAK
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 Bay Area
USIL-zzXIH
STL-SFO
ORD-SJC
MDW-OAK
ORD-STS
What is the cheapest month to book a flight from Illinois to San Francisco Bay Area?
Currently, October is the cheapest month in which you can book a flight from Illinois to San Francisco Bay Area (average of $80). Flying from Illinois to San Francisco Bay Area in November is currently the most expensive (average of $207). 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 XIH?
Find hourly flight availability from Illinois to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 4, 2026.
A simple way to save on the total cost of your ticket is to fly from Illinois to San Francisco Bay Area in the evening. If you’re flexible enough to do this you can expect to save up to 25% on your trip compared to booking a flight in the morning.
What is the cheapest day to fly from Illinois to San Francisco Bay Area?
Use this chart to determine the cheapest time to fly round-trip from Illinois to San Francisco Bay Area. Price data was last updated on January 31, 2026.
Travelers seeking maximum savings on their Illinois to San Francisco Bay Area flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Illinois to San Francisco Bay Area
Explore weekly flight availability from Illinois to San Francisco Bay Area. 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 February 4, 2026.
The most flights from USIL to zzXIH are scheduled on a Monday (53 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 on average).
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Francisco Bay Area. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Illinois to San Francisco Bay Area
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Francisco Bay Area by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to San Francisco Bay Area by cabin class
Find flights from Illinois to San Francisco Bay Area, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and San Francisco Bay Area flights
Browse other Illinois and San Francisco Bay Area flight options. Last updated on February 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from San Francisco Bay Area
Find the right flight back to Illinois after your stay in San Francisco Bay Area
Illinois to San Francisco Bay Area flights
Consider these flights traveling from Illinois to San Francisco Bay Area.
Top 10 airlines flying from Illinois to San Francisco Bay Area
Discover the top 10 airlines that operate flights from Illinois to San Francisco Bay Area. 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 February 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$53 | Average$215 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$80 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$382 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$112 | Average$374 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$128 | Average$344 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$427 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$183 | Average$304 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$187 | Average$324 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$197 | Average$521 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$207 | Average$488 | FlexibilityNo cancel fee | On-time69% |