HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Francisco Bay Area

$63+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

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.

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 November 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/812:07 pmSTL - SFO
2 stops14h 17mFrontier
Fri 12/128:48 amSFO - STL
1 stop23h 26mFrontier
Deal found 11/1$192
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/107:43 pmSTL - SFO
1 stop14h 10mFrontier
Sat 12/136:00 amSFO - STL
2 stops25h 47mFrontier
Deal found 11/1$195
This CheapOair deal was found by Cheapflights users on 11/3. 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.
Sat 12/207:43 pmSTL - SFO
1 stop6h 41mFrontier
Thu 1/85:46 pmSFO - STL
1 stop25h 06mFrontier
Deal found 11/3$200
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Thu 12/1112:04 pmSTL - SFO
1 stop27h 14mFrontier
Tue 12/166:30 amSFO - STL
1 stop25h 44mFrontier
Deal found 11/1$202
This Frontier deal was found by Cheapflights users on 11/1. 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 12/1210:44 pmSTL - SFO
1 stop11h 04mFrontier
Thu 12/186:00 amSFO - STL
1 stop8h 24mFrontier
Deal found 11/1$204
This Gotogate deal was found by Cheapflights users on 11/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/247:43 pmSTL - SFO
1 stop14h 25mFrontier
Wed 12/36:00 amSFO - STL
1 stop28h 12mFrontier
Deal found 11/2$206
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Thu 12/1112:04 pmSTL - SFO
2 stops14h 20mFrontier
Fri 12/128:48 amSFO - STL
1 stop23h 26mFrontier
Deal found 11/1$207
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 12/812:07 pmSTL - SFO
2 stops14h 17mFrontier
Sun 12/145:46 pmSFO - STL
1 stop16h 26mFrontier
Deal found 11/1$212
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Thu 12/1112:04 pmSTL - SFO
2 stops21h 44mFrontier
Sun 12/145:46 pmSFO - STL
1 stop16h 26mFrontier
Deal found 11/1$213
This CheapOair deal was found by Cheapflights users on 11/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:45 pmSTL - SFO
1 stop28h 42mFrontier
Sun 11/166:33 pmSFO - STL
1 stop17h 24mFrontier
Deal found 11/2$214
This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Fri 12/121:16 pmSTL - SFO
1 stop10h 09mFrontier
Sat 12/136:00 amSFO - STL
2 stops25h 47mFrontier
Deal found 11/1$216
This Expedia deal was found by Cheapflights users on 11/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/98:55 amORD - SJC
1 stop7h 37mAlaska Airlines
Tue 12/1612:35 pmSJC - ORD
1 stop9h 15mAlaska Airlines
Deal found 11/1$238

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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$192
(Kiwi.com)

One-way from

$63
(Trip.com)

Popular in

November

Cheapest in

July

Average price

$387
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. 12% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 3, 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

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Sat 1/24

9:00 am-10:35 pm

1 stop15h 35m

San Jose

Fri 1/30

5:45 pm-11:37 pm

1 stop27h 52m

$262

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 12/17

8:55 am-5:24 pm

2 stops10h 29m

San Francisco

Wed 1/7

10:12 am-11:37 pm

1 stop11h 25m

$266

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Tue 12/9

8:55 am-2:32 pm

1 stop7h 37m

San Jose

Thu 12/11

7:00 am-11:50 pm

1 stop14h 50m

$270

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Fri 12/5

3:05 pm-10:42 pm

1 stop9h 37m

San Jose

Tue 12/9

12:35 pm-11:50 pm

1 stop9h 15m

$270

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 1/30

8:00 am-5:59 pm

1 stop11h 59m

San Francisco

Tue 2/3

11:41 am-11:37 pm

1 stop9h 56m

$272

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 1/24

9:00 am-9:55 pm

2 stops14h 55m

San Francisco

Sun 2/1

7:00 am-11:50 pm

1 stop14h 50m

$278

MolineSan Francisco

MLI - SFO

MLISFO

Moline Quad-City

Sat 1/10

3:58 pm-9:37 pm

1 stop7h 39m

San Francisco

Sat 1/10

12:17 am-10:30 am

1 stop8h 13m

$283

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 1/6

2:20 pm-10:54 pm

1 stop10h 34m

San Francisco

Sat 1/10

2:39 pm-11:53 pm

1 stop7h 14m

$283

ChicagoOakland

ORD - OAK

ORDOAK

Chicago O'Hare Intl

Thu 1/15

8:00 am-4:23 pm

1 stop10h 23m

Oakland

Sun 1/25

5:17 pm-11:50 pm

1 stop28h 33m

$283

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Wed 12/17

8:55 am-2:32 pm

1 stop7h 37m

San Jose

Sun 1/11

3:36 pm-1:10 pm

2 stops19h 34m

$286

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 60 results
1
2
3
...
6

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 December is currently the most expensive (average of $203). 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 November 3, 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 15% 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.

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 November 3, 2025.

The most flights from USIL to zzXIH are scheduled on a Monday (68 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 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 $283, Alaska Airlines can have you in San Francisco Bay Area from Illinois in 7h 39m. There are 1708 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 $113. However, be on the lookout for offers from Alaska Airlines and Delta, 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 December is currently the most expensive (average of $203). 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

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.

Alternative routes for Illinois to San Francisco Bay Area

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to Las Vegas flights
San Francisco to Los Angeles flights
John F Kennedy Intl to San Francisco flights
Seattle to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
Newark to Los Angeles flights
Seattle to Los Angeles flights
San Francisco to Las Vegas flights
O'Hare Intl to Las Vegas flights
Newark to San Francisco flights
LaGuardia to Los Angeles flights
San Francisco to Ontario flights
Dallas/Fort Worth to Los Angeles flights
Boston to Los Angeles flights
O'Hare Intl to Los Angeles flights
Dulles Intl to Las Vegas flights
Dulles Intl to Los Angeles flights
Reagan-National to Los Angeles flights
Boston to Las Vegas flights
Denver to Las Vegas flights
LaGuardia to Las Vegas flights
Seattle to Santa Ana flights
Ontario to San Francisco flights
Los Angeles to San Francisco flights
Los Angeles to Las Vegas flights
Seattle to San Diego flights
Dallas/Fort Worth to San Francisco flights
Minneapolis to Las Vegas flights
Atlanta to Las Vegas flights
O'Hare Intl to San Francisco flights
Baltimore to Los Angeles flights
Hobby to Las Vegas flights
John F Kennedy Intl to San Diego flights
San Francisco to Santa Ana flights
Reagan-National to Las Vegas flights
Seattle to Ontario flights
Baltimore to Las Vegas flights
Orlando to Las Vegas flights
Atlanta to Los Angeles flights
Santa Ana to San Francisco flights
San Jose to Las Vegas flights
LaGuardia to San Francisco flights
Portland to Los Angeles flights
Cleveland to Las Vegas flights
George Bush Intcntl to Las Vegas flights
Detroit to Las Vegas flights
Burbank to Las Vegas flights
Oakland to Las Vegas flights

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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$80Average$261FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$227FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$108Average$382FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$375FlexibilityNo cancel feeOn-time83%
DeltaCheapest$128Average$346FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$138Average$437FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$192Average$324FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$512FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$203Average$448FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.