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San Francisco Bay Area

$80+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
oct. 19 — oct. 261
dom. 10/19
dom. 10/26
1 adult, Economy
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Cheap 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 septiembre 19, 2025.

Round-trip from

$180
(Mytrip)

One-way from

$80
(Cheapflightsfares)

Popular in

December

Cheapest in

July

Average price

$297
From Illinois to San Francisco Bay Area
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One-way flight from Illinois to San Francisco Bay Area
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Highest demand for flights based on searches. 8% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Illinois to San Francisco Bay Area

Cheapest flights from Illinois to San Francisco Bay Area
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 septiembre 19, 2025.

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.
jue. 10/911:32 amSTL - SFO
1 stop11h 51mFrontier
jue. 10/235:45 amSFO - STL
1 stop27h 58mFrontier
Deal found 9/18$180
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/1711:32 amSTL - SFO
1 stop11h 51mFrontier
dom. 10/198:21 pmSFO - STL
1 stop10h 46mFrontier
Deal found 9/18$184
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/27:55 pmSTL - SFO
1 stop6h 21mFrontier
mar. 10/76:34 amSFO - STL
1 stop24h 33mFrontier
Deal found 9/16$187
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/114:51 pmSTL - SFO
1 stop6h 38mFrontier
lun. 10/136:34 amSFO - STL
1 stop24h 33mFrontier
Deal found 9/18$190
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/27:55 pmSTL - SFO
1 stop6h 21mFrontier
dom. 10/511:00 pmSFO - STL
1 stop14h 04mFrontier
Deal found 9/16$192
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:50 amORD - SJC
1 stop6h 42mFrontier
lun. 10/2012:35 pmSJC - ORD
1 stop10h 24mFrontier
Deal found 9/18$196
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/76:00 amORD - SJC
1 stop7h 32mMultiple Airlines
mié. 11/123:00 pmSJC - ORD
1 stop6h 59mMultiple Airlines
Deal found 9/16$198
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/257:55 pmSTL - SJC
1 stop17h 35mFrontier
lun. 9/2912:25 pmSJC - STL
1 stop18h 41mFrontier
Deal found 9/18$199
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/17:55 pmSTL - SFO
1 stop19h 22mFrontier
lun. 10/136:34 amSFO - STL
1 stop24h 33mFrontier
Deal found 9/18$204
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/246:50 amORD - SJC
1 stop6h 42mMultiple Airlines
mié. 10/2910:25 amSJC - ORD
1 stop6h 34mMultiple Airlines
Deal found 9/17$204
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/67:55 pmSTL - SFO
1 stop6h 21mFrontier
vie. 10/108:21 pmSFO - STL
1 stop10h 46mFrontier
Deal found 9/17$206
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/211:27 amSTL - SFO
1 stop11h 44mFrontier
dom. 11/98:55 pmSFO - STL
1 stop12h 29mFrontier
Deal found 9/18$207

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 septiembre 19, 2025.
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

ChicagoSan Jose

MDW - SJC

MDWSJC

Chicago Midway

jue. 10/16

6:24 pm-11:32 am

1 stop19h 08m

San Jose

lun. 10/20

12:35 pm-12:24 am

1 stop9h 49m

$208

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

jue. 11/6

2:54 pm-10:01 pm

1 stop9h 07m

San Francisco

mar. 11/11

10:35 am-7:55 pm

1 stop7h 20m

$238

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

vie. 12/12

3:05 pm-11:48 pm

1 stop10h 43m

San Francisco

lun. 12/15

7:47 pm-2:09 pm

1 stop16h 22m

$241

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

vie. 11/7

7:37 am-3:57 pm

1 stop10h 20m

San Jose

mar. 11/11

2:21 pm-11:58 pm

1 stop7h 37m

$249

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

lun. 12/8

9:15 am-2:26 pm

1 stop7h 11m

San Jose

lun. 12/15

10:28 am-2:09 pm

1 stop25h 41m

$257

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

mar. 11/11

8:59 pm-2:23 pm

1 stop19h 24m

San Jose

dom. 11/16

10:25 am-7:55 pm

1 stop7h 30m

$257

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

mié. 10/8

8:20 am-2:01 pm

1 stop7h 41m

San Francisco

mar. 10/14

10:26 am-11:59 pm

1 stop11h 33m

$259

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

mar. 12/2

3:05 pm-9:46 pm

1 stop8h 41m

San Francisco

lun. 12/8

8:09 am-11:50 pm

1 stop13h 41m

$271

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

vie. 12/5

3:05 pm-10:42 pm

1 stop9h 37m

San Jose

dom. 12/7

10:28 am-6:54 pm

1 stop6h 26m

$276

ChicagoOakland

ORD - OAK

ORDOAK

Chicago O'Hare Intl

vie. 11/14

5:53 pm-11:59 pm

1 stop8h 06m

Oakland

mar. 11/18

6:30 am-4:30 pm

1 stop8h 00m

$276

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/19

Showing 1-10 of 60 results
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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.
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

What is the cheapest month to book a flight from Illinois to San Francisco Bay Area?

Currently, January is the cheapest month in which you can book a flight from Illinois to San Francisco Bay Area (average of $276). Flying from Illinois to San Francisco Bay Area in June is currently the most expensive (average of $357). 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 septiembre 19, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to San Francisco Bay Area as you normally would.

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 septiembre 19, 2025.

The most flights from USIL to zzXIH are scheduled on a Friday (91 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (45 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.

  • How long is the flight from Illinois to San Francisco Bay Area?

    For as low as $238, Frontier can have you in San Francisco Bay Area from Illinois in 9h 07m. There are 1841 mi between Illinois and San Francisco Bay Area. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to San Francisco Bay Area one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $80. However, be on the lookout for offers from Hawaiian Airlines and Alaska Airlines, as they are both options that can get you from Illinois to San Francisco Bay Area for a low price.

  • Can I find deals for flights from Illinois to San Francisco Bay Area that include hotel bookings?

    Yes. In addition to deals on Illinois to San Francisco Bay Area flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Francisco Bay Area?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to San Francisco Bay Area.

  • Can I find deals for business class flights from Illinois to San Francisco Bay Area?

    Yes. Cheapflights offers flight deals from Illinois to San Francisco Bay Area by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to San Francisco Bay Area?

    Currently, January is the cheapest month in which you can book a flight from Illinois to San Francisco Bay Area (average of $276). Flying from Illinois to San Francisco Bay Area in June is currently the most expensive (average of $357). 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.

See more FAQs

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Alternative routes for Illinois to San Francisco Bay Area

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Top 9 airlines flying from Illinois to San Francisco Bay Area

Discover the top 9 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 septiembre 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$83Average$243FlexibilityNo cancel feeOn-time65%
FrontierCheapest$90Average$263FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$382FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$335FlexibilityNo cancel feeOn-time83%
DeltaCheapest$128Average$348FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$180Average$421FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$188Average$328FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$496FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$204Average$432FlexibilityNo cancel feeOn-time69%

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