What airlines fly to Illinois?

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Illinois from California according to our data. American Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 9 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from California to Illinois?

Southwest, Delta, and United Airlines are the most popular carriers operating from California to Illinois

How many flights depart from California to Illinois on average per day?

As of May 2026, there are 326 flights per day flying from California to Illinois. The most common time of day flights depart is 10:00AM, with 43% of flights taking off at noon.

How long is the flight from California to Illinois?

The flight from California to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from San Diego (a popular airport in California) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 54m on average. If you fly from Los Angeles (another popular airport in California) to Chicago O'Hare Intl Airport, then the average flight time is 4h 02m.

How many flights depart from California to Illinois on average per week?

As of May 2026, 2,287 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Mon, with 16% of weekly flights taking off on this day.

When did momondo last update prices for flights from California to Illinois?

Prices for flights from California to Illinois were last updated today.

How many operators does momondo search for flights from California to Illinois?

As of May 2026, there are 9 operators available to choose from for flights from California to Illinois.

How old do you have to be to fly from California to Illinois?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from California to Illinois.

What documentation or ID do you need to fly to Illinois?

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$84 Cheap Flights from California to Illinois in 2026

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Find the cheapest flights from California to Illinois

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:20 pm - 5:07 am

LAS

ORD

3h 47mnonstop

7:15 am - 9:18 am

ORD

LAS

4h 03mnonstop

$175Frontier

Tue, Jun 23 - Sat, Jul 11

11:20 pm - 5:07 am

LAS

ORD

3h 47mnonstop

7:20 am - 9:36 am

ORD

LAS

4h 16mnonstop

$176Frontier

Tue, Jun 23 - Mon, Jun 29

5:10 am - 11:25 am

LAX

ORD

4h 15mnonstop

6:00 am - 8:27 am

ORD

LAX

4h 27mnonstop

$199United Airlines

Tue, Jun 2 - Tue, Jun 9

5:00 pm - 10:55 pm

LAX

MDW

3h 55mnonstop

5:35 am - 7:50 am

MDW

LAX

4h 15mnonstop

$199Southwest

Wed, Jul 1 - Wed, Jul 15

4:10 pm - 12:05 am

LAX

MDW

5h 55m

1 stop

5:35 am - 7:50 am

MDW

LAX

4h 15mnonstop

$209Southwest

Wed, Jul 1 - Wed, Jul 15

2:08 pm - 8:28 pm

SAN

ORD

4h 20mnonstop

8:46 am - 11:21 am

ORD

SAN

4h 35mnonstop

$247United Airlines

Wed, Jun 3 - Tue, Jun 9

2:00 pm - 11:55 pm

SJC

ORD

7h 55m

1 stop

7:00 am - 1:44 pm

ORD

SJC

8h 44m

1 stop

$295Alaska Airlines

Sat, Jun 6 - Wed, Aug 19

11:10 pm - 5:39 am

SFO

ORD

4h 29mnonstop

9:00 pm - 11:58 pm

ORD

SFO

4h 58mnonstop

$297American Airlines

Mon, Jun 8 - Tue, Jun 16

3:08 pm - 9:39 pm

SNA

ORD

4h 31mnonstop

11:54 am - 2:18 pm

ORD

SNA

4h 24mnonstop

$330American Airlines

Thu, May 28 - Sun, May 31

8:20 pm - 6:20 am

SMF

ORD

8h 00m

1 stop

7:40 am - 1:58 pm

ORD

SMF

8h 18m

1 stop

$349Alaska Airlines

Tue, Jun 2 - Sat, Jun 6

American Airlines flights from California to Illinois

Our best American Airlines deals on California to Illinois flight tickets

American Airlines

May 31

SAN6:15 amSan Diego

4h 25m

ORD12:40 pmChicago O'Hare Intl

Jun 6

ORD6:45 amChicago O'Hare Intl

4h 30m

SAN9:15 amSan Diego

$278

American Airlines

Jun 3

SAN6:15 amSan Diego

4h 25m

ORD12:40 pmChicago O'Hare Intl

Jun 5

ORD9:17 pmChicago O'Hare Intl

4h 31m

SAN11:48 pmSan Diego

$279

American Airlines

Jun 8

SFO11:10 pmSan Francisco

4h 29m

ORD5:39 amChicago O'Hare Intl

Jun 16

ORD9:00 pmChicago O'Hare Intl

4h 58m

SFO11:58 pmSan Francisco

$297

Frontier flights from California to Illinois

Our best Frontier deals on California to Illinois flight tickets

Frontier

Jun 23

LAS11:20 pmLas Vegas Harry Reid Intl

3h 47m

ORD5:07 amChicago O'Hare Intl

Jul 11

ORD7:15 amChicago O'Hare Intl

4h 03m

LAS9:18 amLas Vegas Harry Reid Intl

$175

Frontier

Jun 23

LAS11:20 pmLas Vegas Harry Reid Intl

3h 47m

ORD5:07 amChicago O'Hare Intl

Jun 29

ORD7:20 amChicago O'Hare Intl

4h 16m

LAS9:36 amLas Vegas Harry Reid Intl

$176

Frontier

Jul 7

LAS11:40 pmLas Vegas Harry Reid Intl

3h 48m

ORD5:28 amChicago O'Hare Intl

Jul 13

ORD7:15 amChicago O'Hare Intl

4h 03m

LAS9:18 amLas Vegas Harry Reid Intl

$177

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Tue 6/23

11:20 pm-5:07 am

Nonstop3h 47m

Chicago O'Hare Intl

Sat 7/11

7:15 am-9:18 am

Nonstop4h 03m

$175

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Tue 6/23

11:20 pm-5:07 am

Nonstop3h 47m

Chicago O'Hare Intl

Mon 6/29

7:20 am-9:36 am

Nonstop4h 16m

$176

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles Los Angeles

Tue 6/2

5:10 am-11:25 am

Nonstop4h 15m

Chicago O'Hare Intl

Tue 6/9

6:00 am-8:27 am

Nonstop4h 27m

$199

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles Los Angeles

Wed 7/1

5:00 pm-10:55 pm

Nonstop3h 55m

Chicago Midway

Wed 7/15

5:35 am-7:50 am

Nonstop4h 15m

$199

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles Los Angeles

Wed 7/1

4:10 pm-12:05 am

1 stop5h 55m

Chicago Midway

Wed 7/15

5:35 am-7:50 am

Nonstop4h 15m

$209

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 6/3

2:08 pm-8:28 pm

Nonstop4h 20m

Chicago O'Hare Intl

Tue 6/9

8:46 am-11:21 am

Nonstop4h 35m

$247

San JoseChicago

SJC - ORD

SJCORD

San Jose

Sat 6/6

2:00 pm-11:55 pm

1 stop7h 55m

Chicago O'Hare Intl

Wed 8/19

7:00 am-1:44 pm

1 stop8h 44m

$295

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Mon 6/8

11:10 pm-5:39 am

Nonstop4h 29m

Chicago O'Hare Intl

Tue 6/16

9:00 pm-11:58 pm

Nonstop4h 58m

$297

Santa AnaChicago

SNA - ORD

SNAORD

Santa Ana J. Wayne/Orange Cnty

Thu 5/28

3:08 pm-9:39 pm

Nonstop4h 31m

Chicago O'Hare Intl

Sun 5/31

11:54 am-2:18 pm

Nonstop4h 24m

$330

SacramentoChicago

SMF - ORD

SMFORD

Sacramento Intl

Tue 6/2

8:20 pm-6:20 am

1 stop8h 00m

Chicago O'Hare Intl

Sat 6/6

7:40 am-1:58 pm

1 stop8h 18m

$349

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from California to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from California is in September. Flight prices, which tend to average around $301, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $304.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from California to Illinois is on a Thursday when prices can be found for as low as $374. Flights from California to Illinois on a Sunday will generally be more expensive and average around $443. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from California to Illinois during this time can be as low as $300. Flights at noon are often more expensive with an average ticket price of $485.

What is the cheapest California to Illinois flight route?

Fly from Los Angeles Los Angeles to Chicago O'Hare Intl for the best California - Illinois flight prices

How far in advance should I book a flight from California to Illinois?

You are more likely to see cheaper flights to Illinois from California when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $329 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from California for as low as $272 on momondo.

Can stopping save me money on California to Illinois flights?

You could potentially save up to 15% on your flight if you consider stops on a California to Illinois flight.

Cheap California to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from California to Illinois

Best Price Found	$171
Fastest flight time	3h 05m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from California in the past 72 hours is $171. The best round-trip flight deal from California to Illinois found on momondo in the last 72 hours is $333.

The fastest flight from California to Illinois takes 3h 05m

Direct flights go from California to Illinois every day.

There are 98 airports in Illinois. From California there are direct flights to Chicago O'Hare Intl (ORD).

Search flight deals

Frequently asked questions about flying from California to Illinois

When did momondo last update prices for flights from California to Illinois?
Prices for flights from California to Illinois were last updated today.
How many operators does momondo search for flights from California to Illinois?
As of May 2026, there are 9 operators available to choose from for flights from California to Illinois.
How old do you have to be to fly from California to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from California to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from California to Illinois?
momondo data reveals that the most frequently booked plane model on the route from California to Illinois is Airbus A321neo, representing 19.79% of all bookings. The subsequent popular models are Boeing 737-800 at 17.13%, Boeing 737 MAX 8 at 10.26%, and Airbus A321-100/200 at 10.13%.

Best airlines flying from California to Illinois

Compare and see reviews for airlines that fly from California to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $51	Free Cancellation	Rating 5.6 2,952 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $103	Free Cancellation	Rating 6.3 8,630 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $122	Free Cancellation	Rating 7.9 8,452 reviews	Search Delta flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 9,711 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $150	Free Cancellation	Rating 7.9 12,361 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $157	Free Cancellation	Rating 7.1 11,663 reviews	Search American Airlines flights
JetBlue	PriceFrom $166	Free Cancellation	Rating 7.1 2,973 reviews	Search JetBlue flights
Southwest	PriceFrom $179	Free Cancellation	Rating 7.9 4,296 reviews	Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from California to Illinois?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from California to Illinois. momondo saves you time and could save you money on your trip.

Can I find flights from California to Illinois with flexible booking policies on momondo?

Flights from California to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from California to Illinois?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from California to Illinois.

I’m not ready to book a flight from California to Illinois right now. Can momondo alert me if prices change?

If you are not ready to book a flight from California to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

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Popular cities in Illinois

Flights to New Yorkfrom $77

Flights to Los Angelesfrom $46

Flights to Orlandofrom $63

Flights to Miamifrom $56

Flights to Chicagofrom $59

Flights to San Franciscofrom $58

Flights to Las Vegasfrom $48

Flights to Washington, D.C.from $57

Flights to Bostonfrom $73

Flights to Atlantafrom $50

Flights to Fort Lauderdalefrom $56

Flights to Dallasfrom $50

Cheap flights from California to Illinois from $84

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from California to Illinois departing on 8/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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American Airlines flights from California to Illinois

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Our best Frontier deals on California to Illinois flight tickets

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See travel insights to Illinois from

How to get the cheapest flight ticket from California to Illinois

What is the cheapest month to fly to Illinois?

What is the cheapest day to depart on your flight to Illinois?

What is the cheapest time of day to depart on your flight to Illinois?

What is the cheapest California to Illinois flight route?

How far in advance should I book a flight from California to Illinois?

Can stopping save me money on California to Illinois flights?

What is the cheapest airline that flies from California to Illinois?

What airlines fly to Illinois?

How many flights depart from California to Illinois on average per day?

How many flights depart from California to Illinois on average per week?

How long is the flight from California to Illinois?

Cheap California to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from California to Illinois

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

Frequently asked questions about flying from California to Illinois

Best airlines flying from California to Illinois

Compare and see reviews for airlines that fly from California to Illinois with momondo

Why use momondo?

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo

California flight routes

According to popular flight searches on momondo this year

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According to popular flight searches on momondo this year

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