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>

$78 CHEAP FLIGHTS from Illinois to San Francisco

SFO

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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 16 - Sun, Apr 19

9:55 pm - 11:28 am

STL

SFO

15h 33m

1 stop

11:16 pm - 2:36 pm

SFO

STL

13h 20m

1 stop

$201Frontier

Thu, Apr 30 - Mon, May 4

8:06 pm - 12:27 am

STL

SFO

6h 21m

1 stop

6:00 am - 7:32 pm

SFO

STL

11h 32m

1 stop

$211Frontier

Wed, Mar 25 - Tue, Mar 31

6:05 am - 1:45 pm

MDW

SFO

9h 40m

1 stop

5:40 am - 11:40 am

SFO

MDW

4h 00mnonstop

$227Southwest

Mon, Apr 20 - Tue, Apr 28

6:40 am - 11:35 am

MDW

SFO

6h 55m

1 stop

5:25 am - 11:35 am

SFO

MDW

4h 10mnonstop

$228Southwest

Sat, May 9 - Thu, May 14

7:55 am - 4:52 pm

ORD

SFO

10h 57m

2 stops

5:49 pm - 5:50 am

SFO

ORD

10h 01m

1 stop

$228Multiple Airlines

Fri, Apr 3 - Tue, Apr 7

10:30 am - 1:27 pm

ORD

SFO

4h 57mnonstop

11:52 pm - 6:20 am

SFO

ORD

4h 28mnonstop

$231United Airlines

Fri, May 29 - Mon, Jun 1

6:20 am - 7:10 pm

ORD

SFO

14h 50m

1 stop

4:00 pm - 5:50 am

SFO

ORD

11h 50m

1 stop

$233Multiple Airlines

Tue, Apr 14 - Sat, Apr 18

5:40 pm - 11:09 pm

PIA

SFO

7h 29m

1 stop

1:16 pm - 11:52 pm

SFO

PIA

8h 36m

1 stop

$297American Airlines

Tue, May 5 - Sat, May 9

6:00 am - 1:25 pm

CMI

SFO

9h 25m

1 stop

10:55 pm - 9:06 am

SFO

CMI

8h 11m

1 stop

$298United Airlines

Tue, Apr 14 - Sat, Apr 18

1:22 pm - 10:49 pm

PIA

SFO

11h 27m

2 stops

7:00 am - 5:51 pm

SFO

PIA

8h 51m

1 stop

$302American Airlines

Useful Info

Low season	January
High season	March
Cheapest flight	$78

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly with an average 3% increase in price.

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

Capitola

Pacifica

Millbrae

Campbell

Mill Valley

Newark

Novato

Windsor

Union City

Belmont

Richmond

West Sacramento

American Canyon

Los Altos

Corte Madera

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

$78 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