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>

$79 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

Mon, Apr 27 - Wed, Apr 29

9:55 pm - 9:39 pm

MLI

SFO

25h 44m

2 stops

2:47 pm - 11:29 am

SFO

MLI

18h 42m

1 stop

$235Multiple Airlines

Tue, Apr 21 - Wed, Apr 22

9:27 am - 2:55 pm

MDW

SFO

7h 28m

1 stop

10:55 pm - 8:47 am

SFO

MDW

7h 52m

1 stop

$237Delta

Wed, Apr 15 - Sun, Apr 19

11:07 am - 9:13 am

ORD

SFO

24h 06m

2 stops

6:00 am - 9:50 am

SFO

ORD

25h 50m

1 stop

$237Frontier

Tue, Apr 14 - Wed, Apr 15

11:07 am - 1:52 pm

ORD

SFO

28h 45m

2 stops

6:29 pm - 5:50 am

SFO

ORD

9h 21m

1 stop

$238Frontier

Wed, Apr 22 - Wed, Apr 29

12:50 pm - 9:25 pm

MDW

SFO

10h 35m

2 stops

2:50 pm - 11:20 pm

SFO

MDW

6h 30m

1 stop

$238Southwest

Tue, Apr 14 - Wed, Apr 15

4:00 pm - 11:15 pm

MDW

SFO

9h 15m

2 stops

10:30 am - 9:00 pm

SFO

MDW

8h 30m

1 stop

$239Southwest

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

Wed, Jul 29 - Wed, Aug 5

12:25 pm - 7:39 pm

PIA

SFO

9h 14m

1 stop

11:10 pm - 9:36 am

SFO

PIA

8h 26m

1 stop

$350American Airlines

Fri, May 1 - Sun, May 3

1:36 pm - 6:38 pm

CMI

SFO

7h 02m

1 stop

12:45 am - 9:06 am

SFO

CMI

6h 21m

1 stop

$358United Airlines

Tue, May 12 - Sun, May 17

7:25 pm - 12:50 am

DEC

SFO

7h 25m

1 stop

11:10 pm - 8:58 am

SFO

DEC

7h 48m

1 stop

$364United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$79

Best time to beat the crowds with an average 5% 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

Union City

Belmont

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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Return flight deals

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

San Francisco (SFO)

SFO

$79 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