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

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

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 Francisco (a popular airport in California) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 57m on average. If you fly from Sacramento (another popular airport in California) to Chicago O'Hare Intl Airport, then the average flight time is 3h 58m.

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

As of July 2025, 1,876 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.

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

As of July 2025, there are 268 flights per day flying from California to Illinois. The most common time of day flights depart is 6:00AM, with 45% of flights taking off at noon.

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 42% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 10 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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 July 2025, there are 10 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.

$41 Cheap Flights from California to Illinois in 2025

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Find the cheapest flights from California to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

5:45 am - 2:13 pmLAX-ORD

6h 28m1 stop

3:18 pm - 9:37 pmORD-LAX

8h 19m1 stop

$91Spirit Airlines

Find Deal

Sat, Aug 2 - Tue, Aug 5

5:45 am - 2:13 pmLAX-ORD

6h 28m1 stop

3:18 pm - 9:37 pmORD-LAX

8h 19m1 stop

$97Spirit Airlines

Find Deal

Sat, Aug 2 - Tue, Aug 5

3:00 pm - 9:24 pmSFO-ORD

4h 24mnonstop

7:19 am - 10:05 amORD-SFO

4h 46mnonstop

$105United Airlines

Find Deal

Tue, Aug 19 - Wed, Aug 20

10:40 am - 4:45 pmSFO-MDW

4h 05mnonstop

12:55 pm - 3:25 pmMDW-SFO

4h 30mnonstop

$105Southwest

Find Deal

Sat, Oct 4 - Mon, Oct 6

6:10 am - 12:30 pmSFO-ORD

4h 20mnonstop

6:45 am - 9:18 amORD-SFO

4h 33mnonstop

$106American Airlines

Find Deal

Mon, Aug 25 - Wed, Aug 27

10:40 am - 4:45 pmSFO-MDW

4h 05mnonstop

2:45 pm - 5:15 pmMDW-SFO

4h 30mnonstop

$114Southwest

Find Deal

Sat, Oct 25 - Tue, Oct 28

3:40 pm - 10:03 pmSAN-ORD

4h 23mnonstop

7:00 am - 9:20 amORD-SAN

4h 20mnonstop

$115Frontier

Find Deal

Thu, Aug 28 - Mon, Sep 1

4:55 pm - 11:12 pmSFO-ORD

4h 17mnonstop

9:13 pm - 11:59 pmORD-SFO

4h 46mnonstop

$119United Airlines

Find Deal

Fri, Sep 26 - Mon, Sep 29

4:44 pm - 11:07 pmSAN-ORD

4h 23mnonstop

1:39 pm - 3:59 pmORD-SAN

4h 20mnonstop

$121Frontier

Find Deal

Fri, Aug 15 - Mon, Aug 18

6:00 am - 12:18 pmSFO-ORD

4h 18mnonstop

6:45 am - 9:24 amORD-SFO

4h 39mnonstop

$122American Airlines

Find Deal

Sun, Sep 14 - Sat, Sep 20

American Airlines flights from California to Illinois

Our best American Airlines deals on California to Illinois flight tickets

American Airlines

Aug 25

SFO6:10 amSan Francisco

4h 20m

ORD12:30 pmChicago O'Hare Intl

Aug 27

ORD6:45 amChicago O'Hare Intl

4h 33m

SFO9:18 amSan Francisco

$106

Find similar

American Airlines

Sep 14

SFO6:00 amSan Francisco

4h 18m

ORD12:18 pmChicago O'Hare Intl

Sep 20

ORD6:45 amChicago O'Hare Intl

4h 39m

SFO9:24 amSan Francisco

$122

Find similar

American Airlines

Sep 21

SFO6:00 amSan Francisco

4h 18m

ORD12:18 pmChicago O'Hare Intl

Sep 26

ORD8:26 pmChicago O'Hare Intl

4h 43m

SFO11:09 pmSan Francisco

$133

Find similar

Alaska Airlines flights from California to Illinois

Our best Alaska Airlines deals on California to Illinois flight tickets

Alaska Airlines

Aug 6

SFO3:05 pmSan Francisco

6h 34m

1 stop

ORD11:39 pmChicago O'Hare Intl

Aug 19

ORD7:18 pmChicago O'Hare Intl

4h 48m

SFO10:06 pmSan Francisco

$147

Find similar

Alaska Airlines

Aug 6

SFO3:05 pmSan Francisco

6h 34m

1 stop

ORD11:39 pmChicago O'Hare Intl

Aug 14

ORD7:18 pmChicago O'Hare Intl

4h 48m

SFO10:06 pmSan Francisco

$164

Find similar

Alaska Airlines

Sep 23

OAK7:58 pmOakland

24h 09m

1 stop

ORD10:07 pmChicago O'Hare Intl

Sep 27

ORD2:07 pmChicago O'Hare Intl

7h 11m

1 stop

OAK7:18 pmOakland

$177

Find similar

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 February. Flight prices, which tend to average around $246, 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 February, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $268.

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 $358. Flights from California to Illinois on a Sunday will generally be more expensive and average around $464. 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 $288. Flights at noon are often more expensive with an average ticket price of $441.

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 $301 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 $251 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	$41
Fastest flight time	3h 55m
Direct flights	Every day
Airports in Illinois	2 airports

The best one-way flight to Illinois from California in the past 72 hours is $41. The best round-trip flight deal from California to Illinois found on momondo in the last 72 hours is $91.

The fastest flight from California to Illinois takes 3h 55m

Direct flights go from California to Illinois every day.

There are 2 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW)

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 July 2025, there are 10 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 19.19% of all bookings. The subsequent popular models are Boeing 737-800 at 17.84%, Airbus A321-100/200 at 8.52%, and Boeing 737 MAX 9 at 7.72%.

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
Allegiant Air	PriceFrom $54	Free Cancellation	Rating 7.2 704 reviews	Search Allegiant Air flights
Spirit Airlines	PriceFrom $67	Free Cancellation	Rating 6.3 8,055 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $92	Free Cancellation	Rating 5.9 3,271 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,562 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $128	Free Cancellation	Rating 8.0 7,951 reviews	Search Delta flights
Sun Country Air	PriceFrom $130	Free Cancellation	Rating 6.9 335 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 8,846 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $138	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $157	Free Cancellation	Rating 8.0 4,249 reviews	Search Southwest flights
American Airlines	PriceFrom $181	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines 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

Popular cities in Illinois

Flights to New Yorkfrom $37

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Flights to Las Vegasfrom $16

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Flights to San Franciscofrom $56

Flights to Washington, D.C.from $38

Flights to Bostonfrom $57

Flights to Dallasfrom $66

Flights to Atlantafrom $49

Flights to Seattlefrom $82

Cheap flights from California to Illinois from $41

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 8/5. 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

Price Alerts

Price Alerts

Find the cheapest flights from California to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

American Airlines flights from California to Illinois

Our best American Airlines deals on California to Illinois flight tickets

Alaska Airlines flights from California to Illinois

Our best Alaska Airlines deals on California to Illinois flight tickets

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?

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 $288. Flights at noon are often more expensive with an average ticket price of $441.

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?

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?

Spirit Airlines, Southwest, and United 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 July 2025, there are 268 flights per day flying from California to Illinois. The most common time of day flights depart is 6:00AM, with 45% of flights taking off at noon.

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

As of July 2025, 1,876 flights take off from California and land in Illinois each week. The most common flight departure day for this route is Thu, with 18% 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