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

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

What airlines fly to Illinois?

American Airlines, United Airlines and Spirit Airlines 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 45% 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.

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

As of December 2025, 1,783 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Tue, with 19% of weekly flights taking off on this day.

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

As of December 2025, there are 254 flights per day flying from California to Illinois. The most common time of day flights depart is 6:00AM, with 51% 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 59m on average. If you fly from Santa Ana (another popular airport in California) to Chicago O'Hare Intl Airport, then the average flight time is 4h.

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 December 2025, 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.

$58 Cheap Flights from California to Illinois in 2025/26

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Find the cheapest flights from California to Illinois

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:39 am - 5:26 pm

LAS

ORD

3h 47mnonstop

7:19 pm - 9:42 pm

ORD

LAS

4h 23mnonstop

$107Frontier

vie., feb. 13 - lun., feb. 16

11:39 am - 5:26 pm

LAS

ORD

3h 47mnonstop

7:19 pm - 9:42 pm

ORD

LAS

4h 23mnonstop

$108Frontier

vie., feb. 13 - lun., feb. 23

7:18 pm - 7:54 am

LAX

ORD

10h 36m1 stop

9:18 am - 6:23 pm

ORD

LAX

11h 05m1 stop

$149Spirit Airlines

sáb., feb. 21 - mié., feb. 25

7:18 pm - 7:54 am

LAX

ORD

10h 36m1 stop

9:00 am - 6:23 pm

ORD

LAX

11h 23m1 stop

$152Spirit Airlines

jue., feb. 19 - lun., feb. 23

9:00 am - 4:25 pm

LAX

MDW

5h 25m1 stop

2:10 pm - 4:50 pm

MDW

LAX

4h 40mnonstop

$156Southwest

sáb., ene. 17 - dom., ene. 18

6:20 am - 12:29 pm

SAN

ORD

4h 09mnonstop

7:50 pm - 10:26 pm

ORD

SAN

4h 36mnonstop

$158American Airlines

sáb., ene. 17 - sáb., ene. 24

11:00 pm - 5:00 am

LAX

MDW

4h 00mnonstop

8:55 pm - 11:40 pm

MDW

LAX

4h 45mnonstop

$159Southwest

sáb., ene. 17 - dom., ene. 18

10:35 pm - 4:39 am

SAN

ORD

4h 04mnonstop

8:00 pm - 10:34 pm

ORD

SAN

4h 34mnonstop

$160American Airlines

mié., mar. 4 - mié., mar. 18

7:00 am - 1:13 pm

SAN

ORD

4h 13mnonstop

2:40 pm - 8:49 pm

ORD

SAN

8h 09m1 stop

$163United Airlines

mar., ene. 27 - mar., feb. 3

10:45 pm - 5:15 am

SFO

ORD

4h 30mnonstop

3:45 pm - 6:38 pm

ORD

SFO

4h 53mnonstop

$263United Airlines

mié., may. 6 - sáb., may. 9

Frontier flights from California to Illinois

Our best Frontier deals on California to Illinois flight tickets

Frontier

Feb 27

LAS11:39 amLas Vegas Harry Reid Intl

3h 47m

ORD5:26 pmChicago O'Hare Intl

Mar 2

ORD7:19 pmChicago O'Hare Intl

4h 23m

LAS9:42 pmLas Vegas Harry Reid Intl

$107

Find similar

Frontier

Feb 13

LAS11:39 amLas Vegas Harry Reid Intl

3h 47m

ORD5:26 pmChicago O'Hare Intl

Feb 16

ORD7:19 pmChicago O'Hare Intl

4h 23m

LAS9:42 pmLas Vegas Harry Reid Intl

$108

Find similar

Frontier

Jan 16

LAS6:52 pmLas Vegas Harry Reid Intl

20h 00m

1 stop

ORD4:52 pmChicago O'Hare Intl

Jan 25

ORD9:38 pmChicago O'Hare Intl

4h 21m

LAS11:59 pmLas Vegas Harry Reid Intl

$112

Find similar

Spirit Airlines flights from California to Illinois

Our best Spirit Airlines deals on California to Illinois flight tickets

Spirit Airlines

Feb 21

LAX7:18 pmLos Angeles

10h 36m

1 stop

ORD7:54 amChicago O'Hare Intl

Feb 25

ORD9:18 amChicago O'Hare Intl

11h 05m

1 stop

LAX6:23 pmLos Angeles

$149

Find similar

Spirit Airlines

Feb 19

LAX7:18 pmLos Angeles

10h 36m

1 stop

ORD7:54 amChicago O'Hare Intl

Feb 23

ORD9:00 amChicago O'Hare Intl

11h 23m

1 stop

LAX6:23 pmLos Angeles

$152

Find similar

Spirit Airlines

Feb 26

LAX7:18 pmLos Angeles

10h 36m

1 stop

ORD7:54 amChicago O'Hare Intl

Mar 2

ORD9:00 amChicago O'Hare Intl

11h 23m

1 stop

LAX6:23 pmLos Angeles

$164

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

vie. 2/13

11:39 am-5:26 pm

Nonstop3h 47m

Chicago O'Hare Intl

lun. 2/16

7:19 pm-9:42 pm

Nonstop4h 23m

$107

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

vie. 2/13

11:39 am-5:26 pm

Nonstop3h 47m

Chicago O'Hare Intl

lun. 2/23

7:19 pm-9:42 pm

Nonstop4h 23m

$108

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

sáb. 2/21

7:18 pm-7:54 am

1 stop10h 36m

Chicago O'Hare Intl

mié. 2/25

9:18 am-6:23 pm

1 stop11h 05m

$149

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

jue. 2/19

7:18 pm-7:54 am

1 stop10h 36m

Chicago O'Hare Intl

lun. 2/23

9:00 am-6:23 pm

1 stop11h 23m

$152

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

sáb. 1/17

9:00 am-4:25 pm

1 stop5h 25m

Chicago Midway

dom. 1/18

2:10 pm-4:50 pm

Nonstop4h 40m

$156

San DiegoChicago

SAN - ORD

SANORD

San Diego

sáb. 1/17

6:20 am-12:29 pm

Nonstop4h 09m

Chicago O'Hare Intl

sáb. 1/24

7:50 pm-10:26 pm

Nonstop4h 36m

$158

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

sáb. 1/17

11:00 pm-5:00 am

Nonstop4h 00m

Chicago Midway

dom. 1/18

8:55 pm-11:40 pm

Nonstop4h 45m

$159

San DiegoChicago

SAN - ORD

SANORD

San Diego

mié. 3/4

10:35 pm-4:39 am

Nonstop4h 04m

Chicago O'Hare Intl

mié. 3/18

8:00 pm-10:34 pm

Nonstop4h 34m

$160

San DiegoChicago

SAN - ORD

SANORD

San Diego

mar. 1/27

7:00 am-1:13 pm

Nonstop4h 13m

Chicago O'Hare Intl

mar. 2/3

2:40 pm-8:49 pm

1 stop8h 09m

$163

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

mié. 5/6

10:45 pm-5:15 am

Nonstop4h 30m

Chicago O'Hare Intl

sáb. 5/9

3:45 pm-6:38 pm

Nonstop4h 53m

$263

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 $243, 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 February is also cheap. Prices for this month can be found on momondo for an average of $257.

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 $356. Flights from California to Illinois on a Sunday will generally be more expensive and average around $432. 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 $272. Flights at noon are often more expensive with an average ticket price of $454.

What is the cheapest California to Illinois flight route?

Fly from Los Angeles to Chicago Greater Rockford for the best California - Illinois flight prices

How far in advance should I book a flight 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 $299 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 $239 on momondo.

What cabin class options are available on California to Illinois flights?

There are 4 cabin classes available to choose from on California to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on California to Illinois flights?

You could potentially save up to 2% 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	$166
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 $166. The best round-trip flight deal from California to Illinois found on momondo in the last 72 hours is $311.

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), Lambert-St Louis (STL).

Search flight deals

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 December 2025, 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 18.87% of all bookings. The subsequent popular models are Boeing 737-800 at 17.97%, Boeing 737 MAX 8 at 11.04%, and Boeing 757-300 at 11.00%.

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 $65	Free Cancellation	Rating 5.7 3,067 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $77	Free Cancellation	Rating 6.3 8,238 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,821 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 8,016 reviews	Search Delta flights
Sun Country Air	PriceFrom $130	Free Cancellation	Rating 6.9 337 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 9,124 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 8.0 11,575 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $163	Free Cancellation	Rating 7.2 11,074 reviews	Search American Airlines flights
Southwest	PriceFrom $179	Free Cancellation	Rating 8.0 4,251 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.