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

United Airlines, Southwest, and Alaska 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 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.

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

As of November 2025, 1,657 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Thu, with 20% of weekly flights taking off on this day.

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

As of November 2025, there are 236 flights per day flying from California to Illinois. The most common time of day flights depart is 6:00AM, with 50% 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 Sacramento (a popular airport in California) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 58m on average. If you fly from San Diego (another popular airport in California) to Chicago O'Hare Intl Airport, then the average flight time is 3h 59m.

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 November 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.

$62 Cheap Flights from California to Illinois in 2025/26

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

2:38 pm - 8:29 pmLAS-ORD

3h 51mnonstop

9:38 pm - 11:59 pmORD-LAS

4h 21mnonstop

$92Frontier

Find Deal

Fri, Jan 23 - Sun, Jan 25

2:38 pm - 8:29 pmLAS-ORD

3h 51mnonstop

3:55 pm - 11:03 pmORD-LAS

9h 08m1 stop

$93Frontier

Find Deal

Fri, Jan 23 - Mon, Jan 26

12:52 pm - 10:24 pmLAS-ORD

7h 32m1 stop

12:59 pm - 3:15 pmORD-LAS

4h 16mnonstop

$94Frontier

Find Deal

Thu, Dec 11 - Sun, Dec 14

12:19 am - 6:25 amLAX-ORD

4h 06mnonstop

9:06 pm - 11:52 pmORD-LAX

4h 46mnonstop

$151Spirit Airlines

Find Deal

Tue, Dec 2 - Sat, Dec 6

7:00 am - 1:13 pmSAN-ORD

4h 13mnonstop

7:10 am - 9:40 amORD-SAN

4h 30mnonstop

$154United Airlines

Find Deal

Fri, Jan 16 - Mon, Jan 19

6:15 am - 3:47 pmLAX-ORD

7h 32m1 stop

9:06 pm - 11:52 pmORD-LAX

4h 46mnonstop

$154Spirit Airlines

Find Deal

Sat, Dec 6 - Mon, Dec 8

11:00 pm - 5:00 amLAX-MDW

4h 00mnonstop

2:10 pm - 4:50 pmMDW-LAX

4h 40mnonstop

$159Southwest

Find Deal

Sun, Jan 18 - Tue, Jan 20

2:16 pm - 8:25 pmSAN-ORD

4h 09mnonstop

1:00 pm - 3:30 pmORD-SAN

4h 30mnonstop

$161United Airlines

Find Deal

Fri, Dec 12 - Sat, Dec 13

10:50 am - 8:45 pmSFO-MDW

7h 55m1 stop

8:15 am - 11:00 amMDW-SFO

4h 45mnonstop

$289Southwest

Find Deal

Thu, Dec 11 - Mon, Dec 15

12:20 pm - 12:31 amSFO-ORD

10h 11m1 stop

6:33 pm - 9:40 pmORD-SFO

5h 07mnonstop

$299American Airlines

Find Deal

Wed, Dec 10 - Sat, Dec 13

American Airlines flights from California to Illinois

Our best American Airlines deals on California to Illinois flight tickets

American Airlines

Dec 24

LAS11:59 pmLas Vegas Harry Reid Intl

3h 53m

ORD5:52 amChicago O'Hare Intl

Jan 5

ORD8:47 pmChicago O'Hare Intl

4h 10m

LAS10:57 pmLas Vegas Harry Reid Intl

$145

Find similar

American Airlines

Dec 26

LAS11:59 pmLas Vegas Harry Reid Intl

3h 42m

ORD5:41 amChicago O'Hare Intl

Jan 9

ORD7:38 pmChicago O'Hare Intl

4h 08m

LAS9:46 pmLas Vegas Harry Reid Intl

$154

Find similar

American Airlines

Feb 12

SAN6:15 amSan Diego

4h 07m

ORD12:22 pmChicago O'Hare Intl

Feb 18

ORD5:49 pmChicago O'Hare Intl

4h 36m

SAN8:25 pmSan Diego

$170

Find similar

United Airlines flights from California to Illinois

Our best United Airlines deals on California to Illinois flight tickets

United Airlines

Jan 16

SAN7:00 amSan Diego

4h 13m

ORD1:13 pmChicago O'Hare Intl

Jan 19

ORD7:10 amChicago O'Hare Intl

4h 30m

SAN9:40 amSan Diego

$154

Find similar

United Airlines

Dec 12

SAN2:16 pmSan Diego

4h 09m

ORD8:25 pmChicago O'Hare Intl

Dec 13

ORD1:00 pmChicago O'Hare Intl

4h 30m

SAN3:30 pmSan Diego

$161

Find similar

United Airlines

Dec 13

SAN7:00 amSan Diego

4h 11m

ORD1:11 pmChicago O'Hare Intl

Dec 15

ORD1:00 pmChicago O'Hare Intl

4h 30m

SAN3:30 pmSan Diego

$167

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Fri 1/23

2:38 pm-8:29 pm

Nonstop3h 51m

Chicago O'Hare Intl

Sun 1/25

9:38 pm-11:59 pm

Nonstop4h 21m

$92

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Fri 1/23

2:38 pm-8:29 pm

Nonstop3h 51m

Chicago O'Hare Intl

Mon 1/26

3:55 pm-11:03 pm

1 stop9h 08m

$93

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Thu 12/11

12:52 pm-10:24 pm

1 stop7h 32m

Chicago O'Hare Intl

Sun 12/14

12:59 pm-3:15 pm

Nonstop4h 16m

$94

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Tue 12/2

12:19 am-6:25 am

Nonstop4h 06m

Chicago O'Hare Intl

Sat 12/6

9:06 pm-11:52 pm

Nonstop4h 46m

$151

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 1/16

7:00 am-1:13 pm

Nonstop4h 13m

Chicago O'Hare Intl

Mon 1/19

7:10 am-9:40 am

Nonstop4h 30m

$154

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Sat 12/6

6:15 am-3:47 pm

1 stop7h 32m

Chicago O'Hare Intl

Mon 12/8

9:06 pm-11:52 pm

Nonstop4h 46m

$154

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

Sun 1/18

11:00 pm-5:00 am

Nonstop4h 00m

Chicago Midway

Tue 1/20

2:10 pm-4:50 pm

Nonstop4h 40m

$159

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 12/12

2:16 pm-8:25 pm

Nonstop4h 09m

Chicago O'Hare Intl

Sat 12/13

1:00 pm-3:30 pm

Nonstop4h 30m

$161

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Thu 12/11

10:50 am-8:45 pm

1 stop7h 55m

Chicago Midway

Mon 12/15

8:15 am-11:00 am

Nonstop4h 45m

$289

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 12/10

12:20 pm-12:31 am

1 stop10h 11m

Chicago O'Hare Intl

Sat 12/13

6:33 pm-9:40 pm

Nonstop5h 07m

$299

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 $242, 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 $358. Flights from California to Illinois on a Sunday will generally be more expensive and average around $453. 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 $276. Flights at noon are often more expensive with an average ticket price of $459.

What is the cheapest California to Illinois flight route?

Fly from Los Angeles to Chicago O'Hare Intl 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 $300 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 $244 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?

No. A direct flight is the cheapest option for a flight between 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	$110
Fastest flight time	3h 25m
Direct flights	Every day
Airports in Illinois	2 airports

The best one-way flight to Illinois from California in the past 72 hours is $110. The best round-trip flight deal from California to Illinois found on momondo in the last 72 hours is $260.

The fastest flight from California to Illinois takes 3h 25m

Direct flights go from California to Illinois every day.

There are 2 airports near Illinois: 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 November 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 Boeing 737-800, representing 18.07% of all bookings. The subsequent popular models are Airbus A321neo at 16.86%, Boeing 757-300 at 9.65%, and Boeing 737 MAX 8 at 8.99%.

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
Spirit Airlines	PriceFrom $77	Free Cancellation	Rating 6.3 8,158 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $89	Free Cancellation	Rating 5.8 3,104 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,811 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights
Sun Country Air	PriceFrom $130	Free Cancellation	Rating 6.9 334 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 9,029 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 8.0 11,324 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $168	Free Cancellation	Rating 7.2 11,047 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.

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.

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Find better results for your trip to Illinois

Popular cities in Illinois

Flights to New Yorkfrom $44

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Flights to Orlandofrom $39

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Flights to San Franciscofrom $55

Flights to Washington, D.C.from $36

Flights to Bostonfrom $58

Flights to Atlantafrom $38

Flights to Dallasfrom $45

Flights to Seattlefrom $57

Cheap flights from California to Illinois from $62

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 2/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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Find the cheapest flights from California to Illinois

Cheap round-trip flights

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Cheap last minute flights

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American Airlines flights from California to Illinois

Our best American Airlines deals on California to Illinois flight tickets

United Airlines flights from California to Illinois

Our best United Airlines deals on California to Illinois flight tickets

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Use the filters below to find and compare flights from California to Illinois that are best for you.

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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

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?

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 $276. Flights at noon are often more expensive with an average ticket price of $459.

What is the cheapest California to Illinois flight route?

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

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

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?

No. A direct flight is the cheapest option for a flight between California to Illinois.

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

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

What airlines fly to Illinois?

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

As of November 2025, there are 236 flights per day flying from California to Illinois. The most common time of day flights depart is 6:00AM, with 50% of flights taking off at noon.

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

As of November 2025, 1,657 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Thu, with 20% of weekly flights taking off on this day.

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

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

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

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

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

What is the most popular plane model 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?

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

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

How can momondo help me find flights 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?

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