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>

$97 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

Wed, Jul 8 - Wed, Jul 15

5:35 am - 11:25 am

MDW

SFO

7h 50m

1 stop

11:30 am - 9:45 pm

SFO

MDW

8h 15m

1 stop

$277Southwest

Tue, Jul 7 - Wed, Jul 8

7:40 pm - 11:52 pm

ORD

SFO

6h 12m

1 stop

9:55 am - 6:57 pm

SFO

ORD

7h 02m

1 stop

$277Delta

Fri, Aug 14 - Sun, Aug 23

6:00 am - 7:13 pm

MDW

SFO

15h 13m

1 stop

10:15 pm - 11:09 am

SFO

MDW

10h 54m

1 stop

$280Frontier

Sun, Nov 15 - Tue, Nov 17

1:02 pm - 11:50 pm

ORD

SFO

12h 48m

1 stop

4:00 pm - 5:35 am

SFO

ORD

11h 35m

1 stop

$280Frontier

Wed, Jun 17 - Tue, Aug 4

7:30 am - 10:19 am

ORD

SFO

4h 49mnonstop

6:34 pm - 12:59 am

SFO

ORD

4h 25mnonstop

$282United Airlines

Thu, Sep 17 - Mon, Sep 21

7:40 am - 10:26 am

ORD

SFO

4h 46mnonstop

4:30 pm - 11:00 pm

SFO

ORD

4h 30mnonstop

$287United Airlines

Wed, Oct 14 - Wed, Oct 21

5:19 pm - 11:51 pm

STL

SFO

8h 32m

1 stop

7:05 am - 11:59 pm

SFO

STL

14h 54m

2 stops

$307Multiple Airlines

Wed, Jul 1 - Mon, Jul 6

4:47 pm - 12:48 am

PIA

SFO

10h 01m

1 stop

12:26 am - 11:55 am

SFO

PIA

9h 29m

1 stop

$331American Airlines

Tue, Sep 1 - Wed, Sep 9

7:20 am - 4:00 pm

MLI

SFO

10h 40m

2 stops

7:30 am - 4:01 pm

SFO

MLI

6h 31m

1 stop

$336American Airlines

Thu, Jul 2 - Sat, Jul 4

12:31 pm - 7:44 pm

MLI

SFO

9h 13m

1 stop

7:07 pm - 1:03 pm

SFO

MLI

15h 56m

1 stop

$341Multiple Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$97

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly with an average 11% 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

Marina

Rohnert Park

Emeryville

Pacifica

Capitola

Millbrae

Campbell

Newark

Novato

Mill Valley

Windsor

Union City

West Sacramento

Belmont

Richmond

American Canyon

Corte Madera

Jenner

Los Altos

Everything you need to know for your flight to San Francisco

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

San Francisco (SFO)

SFO

$97 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