How does KAYAK find such low prices on flights from Illinois to San Francisco?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Francisco. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Francisco?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to San Francisco?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Francisco?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$85 CHEAP FLIGHTS from Illinois to San Francisco

SFO

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

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Cheap Flights from Illinois to San Francisco

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to San Francisco

Thu, Apr 30 - Wed, May 6

5:50 am - 5:34 pm

ORD

SFO

13h 44m

1 stop

12:52 pm - 11:01 pm

SFO

ORD

32h 09m

2 stops

$236Frontier

Tue, Apr 28 - Wed, Apr 29

10:00 am - 12:35 pm

MDW

SFO

4h 35mnonstop

5:25 am - 11:35 am

SFO

MDW

4h 10mnonstop

$237Southwest

Wed, May 6 - Wed, May 13

10:30 am - 1:12 pm

ORD

SFO

4h 42mnonstop

7:00 pm - 1:28 am

SFO

ORD

4h 28mnonstop

$237United Airlines

Wed, May 6 - Wed, May 13

6:00 am - 12:38 pm

PIA

SFO

8h 38m

1 stop

7:21 am - 6:24 pm

SFO

PIA

9h 03m

1 stop

$331American Airlines

Wed, May 13 - Sat, May 16

6:40 pm - 11:59 pm

MLI

SFO

7h 19m

1 stop

1:30 pm - 11:54 pm

SFO

MLI

8h 24m

1 stop

$331American Airlines

Sun, May 3 - Wed, May 6

12:19 pm - 12:27 am

MLI

SFO

38h 08m

2 stops

11:26 am - 11:29 am

SFO

MLI

22h 03m

1 stop

$360Multiple Airlines

Sat, Aug 15 - Sat, Aug 22

6:55 pm - 12:20 am

DEC

SFO

7h 25m

1 stop

10:35 pm - 8:46 am

SFO

DEC

8h 11m

1 stop

$364United Airlines

Wed, Sep 23 - Mon, Sep 28

12:00 pm - 7:24 pm

BMI

SFO

9h 24m

1 stop

11:45 pm - 11:11 am

SFO

BMI

9h 26m

1 stop

$369Delta

Wed, Jul 29 - Tue, Aug 4

5:00 pm - 8:47 am

MLI

SFO

17h 47m

2 stops

11:59 pm - 10:22 am

SFO

MLI

8h 23m

1 stop

$386Delta

Sun, May 3 - Wed, May 6

12:19 pm - 7:53 am

MLI

SFO

21h 34m

1 stop

11:26 am - 11:29 am

SFO

MLI

22h 03m

1 stop

$388Multiple Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$85

Best time to beat the crowds with an average 6% drop in price.

Most popular time to fly and prices are also 7% lower on average.

Flight from St. Louis to San Francisco

How does KAYAK find such low prices on flights from Illinois to San Francisco?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Francisco.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Francisco?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to San Francisco?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Francisco?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Calistoga

Rohnert Park

Marina

Emeryville

Pacifica

Capitola

Millbrae

Campbell

Newark

Mill Valley

Novato

Windsor

Belmont

Union City

Richmond

West Sacramento

American Canyon

Corte Madera

Los Altos

Jenner

Everything you need to know for your flight to San Francisco

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Cabin class

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Direct Flights

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Origins

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Return flight deals

Information on the airport you'll fly into in San Francisco

San Francisco (SFO)

SFO

$85 Find Cheap Flights from Illinois to San Francisco

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

Cheap Flights from Illinois to San Francisco

Recent round-trip flight deals from Illinois to San Francisco

Recent one-way flight deals from Illinois to San Francisco

Recent last minute flight deals from Illinois to San Francisco

Recent direct flight deals from Illinois to San Francisco

Good to know

FAQs for booking flights from Illinois to San Francisco

How does KAYAK find such low prices on flights from Illinois to San Francisco?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Francisco.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Francisco?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to San Francisco?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Francisco?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near San Francisco?

Everything you need to know for your flight to San Francisco

Information on the airport you'll fly into in San Francisco

Cabin class types available on flights to Illinois

Complete your trip to San Francisco with a hotel stay or car rental

Find direct flights for San Francisco

Flights to other popular destinations

Flights from domestic origins to San Francisco

Choose which airport to fly into in San Francisco

Find deals for your return flight