How does KAYAK find such low prices on flights from California to Chicago?

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 California to Chicago. 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 California to Chicago?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago from California 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 California to Chicago?

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 Chicago with an airline and back to California 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 California to Chicago?

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 Chicago from California 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>

$67 CHEAP FLIGHTS from California to Chicago

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

...and more

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41,299,237 searches in the past 7 days on KAYAK

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Cheapest round-trip

$151

Typical prices: $254-$518

Frontier

Mon 3/23Wed 3/25

ONT - ORD • 1 stop

Cheapest non-stop

$164

Typical prices: $247-$583

Hawaiian Airlines

Mon 3/9Wed 3/18

SAN - ORD • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Chicago!

Flight Deals

Cheap Flights from California to Chicago

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 California to Chicago

Mon, Mar 23 - Wed, Mar 25

3:30 pm - 6:08 am

ONT

ORD

12h 38m

1 stop

8:55 pm - 7:12 am

ORD

ONT

12h 17m

1 stop

$151Frontier

Mon, Mar 23 - Wed, Mar 25

3:30 pm - 6:08 am

ONT

ORD

12h 38m

1 stop

8:55 pm - 7:12 am

ORD

ONT

12h 17m

1 stop

$154Frontier

Wed, Feb 25 - Mon, Mar 2

7:17 pm - 5:24 pm

ONT

ORD

20h 07m

1 stop

7:19 pm - 1:11 pm

ORD

ONT

19h 52m

1 stop

$158Frontier

Mon, Apr 13 - Sun, Apr 19

8:54 pm - 6:47 am

SAN

ORD

7h 53m

1 stop

7:43 am - 2:25 pm

ORD

SAN

8h 42m

1 stop

$161Frontier

Mon, Apr 13 - Tue, Apr 14

8:54 pm - 6:47 am

SAN

ORD

7h 53m

1 stop

9:45 am - 11:06 pm

ORD

SAN

15h 21m

2 stops

$162Multiple Airlines

Mon, Mar 9 - Wed, Mar 18

5:42 pm - 11:59 pm

SAN

ORD

4h 17mnonstop

8:20 am - 11:02 am

ORD

SAN

4h 42mnonstop

$164Hawaiian Airlines

Tue, Mar 17 - Tue, Mar 17

6:20 am - 12:39 pm

SAN

ORD

4h 19mnonstop

8:06 pm - 10:40 pm

ORD

SAN

4h 34mnonstop

$165American Airlines

Wed, Apr 22 - Sun, Apr 26

10:30 pm - 4:35 am

SAN

ORD

4h 05mnonstop

7:00 am - 9:40 am

ORD

SAN

4h 40mnonstop

$167United Airlines

Sat, Apr 18 - Sun, Apr 19

7:18 pm - 5:31 am

ONT

ORD

8h 13m

1 stop

9:18 pm - 8:04 am

ORD

ONT

12h 46m

1 stop

$169Multiple Airlines

Thu, Apr 9 - Mon, Apr 13

12:45 am - 7:07 am

SFO

ORD

4h 22mnonstop

9:20 pm - 12:19 am

ORD

SFO

4h 59mnonstop

$243United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$67

Best time to beat the crowds but there is an average 12% increase in price.

Most popular time to fly and prices are also 3% lower on average.

Flight from Ontario to Chicago O'Hare Airport

StephenFlew with United Airlines

SMF

ORD

Jan 2026

If you're trying to make a connecting flight make sure you allow PLENTY of time between flights or be prepared to miss the next flight. Make sure to use the restroom at the last possible moment before landing because you could be sitting on the taxiway for 5 more minutes... 5 more minutes... 5 more minutes... until it's been nearly 2 hours. Don't trust the airline provided ETA provided by apps they don't update it until long after you're delayed. If someone is showing up to give you a ride, make sure they have hours to wait for you.

RodFlew with United Airlines

SAN

ORD

Sep 2024

Yes! Don’t reserve a flight with less than 1 1/2 hour connection time or you have a good possibility of missing your connection.

FrancisFlew with United Airlines

LAX

ORD

Sep 2024

Check the weather, or bring a. Raincoat! Being from sunny California, I forget it isn’t always sunshine in other states!

GeraldFlew with Alaska Airlines

SFO

ORD

Oct 2024

Book a flight as early in the day as possible to avoid incoming flight delays.

KimFlew with American Airlines

SNA

ORD

Nov 2024

Bring extra foods and buy extra drinks bring your meds

ShirleyFlew with United Airlines

LAX

ORD

May 2024

Check-in using the United AirLines app to access your boarding pass. Arrive at least two hours early at LAX airport.

How does KAYAK find such low prices on flights from California to Chicago?
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 California to Chicago.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from California to Chicago?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago from California 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 California to Chicago?
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 Chicago with an airline and back to California with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from California to Chicago?
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 Chicago from California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Merrillville

Saint Joseph

Hammond

Portage

Lansing

Valparaiso

Chesterton

Schererville

Munster

Porter

Monticello

Griffith

Saint John

Everything you need to know for your flight to Chicago

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to California

First Class flights to Chicagofrom $563

Business Class flights to Chicagofrom $579

Premium Economy Class flights to Chicagofrom $731

Economy Class flights to Chicagofrom $164

$67 Find Cheap Flights from California to Chicago

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

Everything you should know

Cheap Flights from California to Chicago

Recent round-trip flight deals from California to Chicago

Recent one-way flight deals from California to Chicago

Recent last minute flight deals from California to Chicago

Recent direct flight deals from California to Chicago

Good to know

Flights from California to Chicago: the best tips from KAYAK users

FAQs for booking flights from California to Chicago

How does KAYAK find such low prices on flights from California to Chicago?

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 California to Chicago.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago from California 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 California to Chicago?

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 Chicago with an airline and back to California with another airline.

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

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 Chicago from California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Chicago?

Everything you need to know for your flight to Chicago

Cabin class types available on flights to California

Complete your trip to Chicago with a hotel stay or car rental

Find direct flights for Chicago

Flights to other popular destinations

Flights from domestic origins to Chicago

Choose which airport to fly into in Chicago

Find deals for your return flight