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San Francisco Bay Area

$60+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This Frontier deal was found by Cheapflights users on 12/16. 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.
Sat 12/2010:10 pmSTL - SFO
1 stop11h 38mFrontier
Thu 1/810:18 pmSFO - STL
1 stop11h 54mFrontier
Deal found 12/16$233
This Kiwi.com deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:00 amORD - SFO
1 stop19h 24mFrontier
Wed 1/74:01 pmSFO - ORD
1 stop27h 31mFrontier
Deal found 12/17$241
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/253:27 pmORD - SFO
1 stop18h 21mFrontier
Thu 1/16:24 amSFO - ORD
1 stop15h 48mFrontier
Deal found 12/16$258
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:43 pmSTL - SFO
1 stop6h 41mFrontier
Tue 1/67:00 amSFO - STL
1 stop25h 02mFrontier
Deal found 12/16$259
This CheapOair deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” 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 12/247:43 pmSTL - SFO
1 stop6h 41mFrontier
Sun 1/46:24 amSFO - STL
1 stop25h 38mFrontier
Deal found 12/15$269
This Cheapflightsfares deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:00 amORD - SFO
1 stop27h 23mFrontier
Mon 1/511:20 pmSFO - ORD
1 stop11h 34mFrontier
Deal found 12/15$273
This Super.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:43 pmSTL - SFO
1 stop6h 41mFrontier
Wed 12/3111:20 pmSFO - STL
1 stop8h 20mFrontier
Deal found 12/15$278
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:00 amORD - SFO
1 stop27h 23mFrontier
Thu 1/16:24 amSFO - ORD
1 stop15h 48mFrontier
Deal found 12/16$278
This Frontier deal was found by Cheapflights users on 12/16. 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.
Fri 12/196:12 amMDW - SFO
1 stop9h 01mFrontier
Sat 1/1011:20 pmSFO - MDW
1 stop10h 11mFrontier
Deal found 12/16$282
This Frontier deal was found by Cheapflights users on 12/16. 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.
Fri 12/196:00 amORD - SFO
1 stop9h 13mFrontier
Sat 1/1011:20 pmSFO - ORD
1 stop10h 15mFrontier
Deal found 12/16$282
This Expedia deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” 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.
Wed 12/247:43 pmSTL - SFO
1 stop14h 40mFrontier
Thu 1/16:24 amSFO - STL
1 stop25h 38mFrontier
Deal found 12/14$284
This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Thu 12/253:27 pmORD - SFO
1 stop18h 21mFrontier
Wed 12/311:29 pmSFO - ORD
2 stops28h 54mFrontier
Deal found 12/16$300

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$161
(Kiwi.com)

One-way from

$60
(Trip.com)

Popular in

December

Cheapest in

July

Average price

$449
Provider with most accurate pricing for Chicago (CHI)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-San Francisco flights.
Search Deals
From Illinois to San Francisco Bay Area
Search Deals
One-way flight from Illinois to San Francisco Bay Area
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($59 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

St. LouisSan Jose

STL - SJC

STLSJC

Lambert-St Louis

Thu 2/5

10:01 pm-8:40 am

1 stop12h 39m

San Jose

Mon 2/9

10:37 am-8:50 pm

1 stop8h 13m

$183

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 2/27

1:59 pm-8:03 am

1 stop20h 04m

San Francisco

Mon 3/2

10:58 pm-6:51 am

1 stop29h 53m

$236

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 1/13

9:00 am-4:32 pm

1 stop9h 32m

San Francisco

Mon 1/26

2:30 pm-11:50 pm

1 stop7h 20m

$239

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 1/23

6:06 pm-8:11 am

1 stop16h 05m

San Francisco

Wed 1/28

11:41 am-11:37 pm

1 stop9h 56m

$239

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 1/30

3:44 pm-10:47 pm

1 stop9h 03m

San Francisco

Tue 2/3

2:52 pm-11:37 pm

1 stop6h 45m

$239

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 2/7

3:44 pm-10:47 pm

1 stop9h 03m

San Francisco

Mon 2/9

9:42 pm-1:10 pm

1 stop13h 28m

$246

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 1/22

9:00 am-4:32 pm

1 stop9h 32m

San Francisco

Wed 1/28

9:16 am-11:37 pm

1 stop12h 21m

$246

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sun 2/15

1:28 pm-6:36 pm

1 stop7h 08m

San Francisco

Wed 2/18

6:00 am-5:37 pm

1 stop9h 37m

$248

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 2/24

1:26 pm-6:36 pm

1 stop7h 10m

San Francisco

Wed 3/4

12:40 am-9:06 am

1 stop6h 26m

$248

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sun 3/1

7:17 pm-11:47 pm

1 stop6h 30m

San Francisco

Tue 3/3

6:00 am-5:37 pm

1 stop9h 37m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

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, 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 December 18, 2025.

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 17% 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 December 16, 2024.

Travelers seeking maximum savings on their Illinois to San Francisco Bay Area flight should consider departing on Thursday mornings 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.

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 $248, Frontier can have you in San Francisco Bay Area from Illinois in 7h 08m. There are 1849 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 Spirit Airlines, with whom users have recently found tickets for as low as $58. However, be on the lookout for offers from American Airlines and Frontier, 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, 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.

See more FAQs

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$80Average$223FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$212FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$108Average$382FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$375FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$138Average$434FlexibilityNo cancel feeOn-time63%
DeltaCheapest$159Average$347FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$183Average$427FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$188Average$319FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$527FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$204Average$455FlexibilityNo cancel feeOn-time69%

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