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Cheap flights from California to Illinois from $97

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 9/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from California to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
9:15 pm - 10:01 am
LAS
-
ORD
10h 46m
1 stop
Frontier Logo
2:46 pm - 11:20 pm
ORD
-
LAS
10h 34m
1 stop
$196Frontier
Wed, Sep 23 - Wed, Sep 30
Frontier Logo
11:34 am - 11:08 pm
LAS
-
ORD
9h 34m
1 stop
Frontier Logo
8:45 am - 9:12 pm
ORD
-
LAS
14h 27m
1 stop
$197Frontier
Wed, Aug 19 - Wed, Aug 26
Frontier Logo
8:11 am - 5:59 am
LAS
-
ORD
19h 48m
1 stop
Frontier Logo
6:50 am - 8:58 am
ORD
-
LAS
4h 08mnonstop
$198Frontier
Sat, Sep 5 - Wed, Sep 9
United Airlines Logo
7:00 am - 1:15 pm
LAX
-
ORD
4h 15mnonstop
United Airlines Logo
5:55 am - 8:22 am
ORD
-
LAX
4h 27mnonstop
$237United Airlines
Wed, Sep 16 - Sun, Sep 20
Southwest Logo
5:15 pm - 11:05 pm
LAX
-
MDW
3h 50mnonstop
Southwest Logo
10:15 am - 12:35 pm
MDW
-
LAX
4h 20mnonstop
$237Southwest
Fri, Sep 25 - Tue, Sep 29
Southwest Logo
10:40 am - 4:35 pm
LAX
-
MDW
3h 55mnonstop
Southwest Logo
2:40 pm - 7:10 pm
MDW
-
LAX
6h 30m
1 stop
$243Southwest
Tue, Sep 29 - Sat, Oct 3
Alaska Airlines Logo
1:03 pm - 7:21 pm
SAN
-
ORD
4h 18mnonstop
Alaska Airlines Logo
8:00 am - 5:13 pm
ORD
-
SAN
11h 13m
1 stop
$284Alaska Airlines
Wed, Sep 2 - Wed, Sep 9
Alaska Airlines Logo
5:45 pm - 11:59 pm
SAN
-
ORD
4h 14mnonstop
Alaska Airlines Logo
2:18 pm - 4:55 pm
ORD
-
SAN
4h 37mnonstop
$287Alaska Airlines
Fri, Sep 4 - Sat, Sep 5
United Airlines Logo
6:38 pm - 12:59 am
SFO
-
ORD
4h 21mnonstop
United Airlines Logo
6:07 am - 8:45 am
ORD
-
SFO
4h 38mnonstop
$295United Airlines
Fri, Sep 25 - Mon, Sep 28
American Airlines Logo
11:20 am - 5:49 pm
SNA
-
ORD
4h 29mnonstop
American Airlines Logo
12:09 pm - 5:32 pm
ORD
-
SNA
7h 23m
1 stop
$330American Airlines
Sat, Sep 5 - Wed, Sep 9

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Alaska Airlines flights from California to Illinois

Our best Alaska Airlines deals on California to Illinois flight tickets
Alaska Airlines
Sep 2
SAN1:03 pmSan Diego
4h 18m
ORD7:21 pmChicago O'Hare Intl
Sep 9
ORD6:00 amChicago O'Hare Intl
10h 42m
1 stop
SAN2:42 pmSan Diego
$284
Alaska Airlines
Sep 4
SAN5:45 pmSan Diego
4h 14m
ORD11:59 pmChicago O'Hare Intl
Sep 5
ORD2:18 pmChicago O'Hare Intl
4h 37m
SAN4:55 pmSan Diego
$287
Alaska Airlines
Aug 15
SAN7:00 amSan Diego
4h 21m
ORD1:21 pmChicago O'Hare Intl
Aug 17
ORD6:20 amChicago O'Hare Intl
4h 34m
SAN8:54 amSan Diego
$291

Frontier flights from California to Illinois

Our best Frontier deals on California to Illinois flight tickets
Frontier
Aug 19
LAS11:34 amLas Vegas Harry Reid Intl
9h 34m
1 stop
ORD11:08 pmChicago O'Hare Intl
Aug 26
ORD8:45 amChicago O'Hare Intl
14h 27m
1 stop
LAS9:12 pmLas Vegas Harry Reid Intl
$197
Frontier
Sep 5
LAS8:11 amLas Vegas Harry Reid Intl
19h 48m
1 stop
ORD5:59 amChicago O'Hare Intl
Sep 9
ORD6:50 amChicago O'Hare Intl
4h 08m
LAS8:58 amLas Vegas Harry Reid Intl
$198
Frontier
Sep 3
LAS12:56 pmLas Vegas Harry Reid Intl
4h 06m
ORD7:02 pmChicago O'Hare Intl
Sep 6
ORD9:20 pmChicago O'Hare Intl
12h 56m
1 stop
LAS8:16 amLas Vegas Harry Reid Intl
$199

momondo Fare Finder

 
Customize your flight search to find flights from California to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 23, 2026.
Use the filters below to find and compare flights from California to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Wed 9/23

9:15 pm-10:01 am

1 stop10h 46m

Chicago O'Hare Intl

Wed 9/30

2:46 pm-11:20 pm

1 stop10h 34m

$196

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Wed 8/19

11:34 am-11:08 pm

1 stop9h 34m

Chicago O'Hare Intl

Wed 8/26

8:45 am-9:12 pm

1 stop14h 27m

$197

Las VegasChicago

LAS - ORD

LASORD

Las Vegas Harry Reid Intl

Sat 9/5

8:11 am-5:59 am

1 stop19h 48m

Chicago O'Hare Intl

Wed 9/9

6:50 am-8:58 am

Nonstop4h 08m

$198

Los AngelesChicago

LAX - ORD

LAXORD

Los Angeles

Wed 9/16

7:00 am-1:15 pm

Nonstop4h 15m

Chicago O'Hare Intl

Sun 9/20

5:55 am-8:22 am

Nonstop4h 27m

$237
Quickest round-trip

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

Fri 9/25

5:15 pm-11:05 pm

Nonstop3h 50m

Chicago Midway

Tue 9/29

10:15 am-12:35 pm

Nonstop4h 20m

$237

Los AngelesChicago

LAX - MDW

LAXMDW

Los Angeles

Tue 9/29

10:40 am-4:35 pm

Nonstop3h 55m

Chicago Midway

Sat 10/3

2:40 pm-7:10 pm

1 stop6h 30m

$243

San DiegoChicago

SAN - ORD

SANORD

San Diego

Wed 9/2

1:03 pm-7:21 pm

Nonstop4h 18m

Chicago O'Hare Intl

Wed 9/9

8:00 am-5:13 pm

1 stop11h 13m

$284

San DiegoChicago

SAN - ORD

SANORD

San Diego

Fri 9/4

5:45 pm-11:59 pm

Nonstop4h 14m

Chicago O'Hare Intl

Sat 9/5

2:18 pm-4:55 pm

Nonstop4h 37m

$287

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Fri 9/25

6:38 pm-12:59 am

Nonstop4h 21m

Chicago O'Hare Intl

Mon 9/28

6:07 am-8:45 am

Nonstop4h 38m

$295

Santa AnaChicago

SNA - ORD

SNAORD

Santa Ana J. Wayne/Orange Cnty

Sat 9/5

11:20 am-5:49 pm

Nonstop4h 29m

Chicago O'Hare Intl

Wed 9/9

12:09 pm-5:32 pm

1 stop7h 23m

$330

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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?

The cheapest month to fly to Illinois from California is in September. Flight prices, which tend to average around $320, 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 October is also cheap. Prices for this month can be found on momondo for an average of $349.

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

The cheapest day to depart from California to Illinois is on a Wednesday when prices can be found for as low as $403. Flights from California to Illinois on a Sunday will generally be more expensive and average around $494. 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 $343. Flights at noon are often more expensive with an average ticket price of $507.

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 $350 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 $295 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 31% 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

$193

Fastest flight time

3h 00m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from California in the past 72 hours is $193. The best round-trip flight deal from California to Illinois found on momondo in the last 72 hours is $329.
The fastest flight from California to Illinois takes 3h 00m
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?

  • 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?

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
FrontierPriceFrom $97Free CancellationRating
5.6
2,772 reviews
Search Frontier flights
DeltaPriceFrom $122Free CancellationRating
7.8
8,484 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $137Free CancellationRating
7.8
2,821 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $156Free CancellationRating
7.9
12,702 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $157Free CancellationRating
7.1
11,838 reviews
Search American Airlines flights
United AirlinesPriceFrom $163Free CancellationRating
7.4
10,024 reviews
Search United Airlines flights
JetBluePriceFrom $166Free CancellationRating
7.1
3,021 reviews
Search JetBlue flights
SouthwestPriceFrom $179Free CancellationRating
8.0
4,236 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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Find better results for your trip to Illinois

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