What is the cheapest airline that flies from Illinois to San Francisco?

Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Illinois to San Francisco

What airlines fly to San Francisco?

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to San Francisco from Illinois according to our data. United Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 9 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to San Francisco?

Flight times from Illinois to San Francisco vary, but if you’re flying out of Chicago and flying into San Francisco (one of the most popular routes), then the duration is 4h 43m on average. Another popular route from Illinois to San Francisco is flying from Peoria to San Francisco, which will take roughly 7h 18m. Keep in mind that layovers or delays could extend your travel time.

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

As of December 2025, there are 460 flights per week flying from Illinois to San Francisco. The most common day of the week flights depart is Fri, with 17% of flights taking off on this day.

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

65 flights are operational daily from Illinois to San Francisco as of December 2025. The most popular departure time for this route is 5:00PM, with 43% of flights per day taking off in the afternoon.

When did momondo last update prices for flights from Illinois to San Francisco Airport?

Prices for flights from Illinois to San Francisco Airport refresh daily.

How many operators does momondo search for flights from Illinois to San Francisco Airport?

As of December 2025, there are 8 operators available to choose from for flights from Illinois to San Francisco Airport.

How old do you have to be to fly from Illinois to San Francisco Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to San Francisco Airport.

What documentation or ID do you need to fly to San Francisco Airport?

The required travel and health documents for your San Francisco Airport 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 San Francisco Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$60 Cheap Flights from Illinois to San Francisco in 2025/26

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Find the cheapest flights from Illinois to San Francisco

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:45 pm - 12:38 pm

STL

SFO

16h 53m1 stop

2:08 pm - 9:06 pm

SFO

STL

28h 58m1 stop

$151Frontier

Mon, Jan 26 - Wed, Jan 28

3:46 pm - 11:41 pm

STL

SFO

9h 55m1 stop

4:46 pm - 8:37 pm

SFO

STL

25h 51m1 stop

$156Frontier

Sat, Jan 24 - Sat, Jan 31

4:10 pm - 9:50 pm

MDW

SFO

7h 40m1 stop

5:15 am - 11:10 am

SFO

MDW

3h 55mnonstop

$242Southwest

Wed, Mar 4 - Sat, Mar 7

10:45 am - 5:36 pm

MDW

SFO

8h 51m1 stop

10:40 pm - 8:53 am

SFO

MDW

8h 13m1 stop

$243Delta

Tue, Mar 24 - Tue, Mar 31

8:55 am - 2:55 pm

ORD

SFO

8h 00m1 stop

10:35 pm - 8:35 am

SFO

ORD

8h 00m1 stop

$243Delta

Sat, May 2 - Tue, May 5

3:35 pm - 9:58 pm

ORD

SFO

8h 23m1 stop

10:16 am - 11:37 pm

SFO

ORD

11h 21m1 stop

$244Alaska Airlines

Thu, Jan 22 - Tue, Jan 27

6:20 pm - 11:15 pm

MDW

SFO

6h 55m1 stop

5:40 am - 11:40 am

SFO

MDW

4h 00mnonstop

$245Southwest

Sat, Mar 14 - Wed, Mar 18

9:28 am - 5:47 pm

ORD

SFO

10h 19m1 stop

11:23 pm - 5:42 am

SFO

ORD

4h 19mnonstop

$246American Airlines

Wed, Feb 18 - Wed, Feb 25

11:46 am - 2:37 pm

ORD

SFO

4h 51mnonstop

6:00 am - 12:25 pm

SFO

ORD

4h 25mnonstop

$247American Airlines

Wed, Jan 21 - Tue, Jan 27

3:44 pm - 10:47 pm

ORD

SFO

9h 03m1 stop

7:00 am - 5:10 pm

SFO

ORD

8h 10m1 stop

$248Alaska Airlines

Sat, Jan 31 - Fri, Feb 6

Alaska Airlines flights from Illinois to San Francisco

Our best Alaska Airlines deals on Illinois to San Francisco flight tickets

Alaska Airlines

Jan 27

ORD3:44 pmChicago O'Hare Intl

9h 03m

1 stop

SFO10:47 pmSan Francisco

Feb 2

SFO7:00 amSan Francisco

29h 29m

1 stop

ORD2:29 pmChicago O'Hare Intl

$244

Find similar

Alaska Airlines

Jan 31

ORD3:44 pmChicago O'Hare Intl

9h 03m

1 stop

SFO10:47 pmSan Francisco

Feb 5

SFO2:30 pmSan Francisco

7h 20m

1 stop

ORD11:50 pmChicago O'Hare Intl

$248

Find similar

Alaska Airlines

Jan 20

ORD3:44 pmChicago O'Hare Intl

9h 03m

1 stop

SFO10:47 pmSan Francisco

Feb 8

SFO7:00 amSan Francisco

8h 10m

1 stop

ORD5:10 pmChicago O'Hare Intl

$249

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Frontier flights from Illinois to San Francisco

Our best Frontier deals on Illinois to San Francisco flight tickets

Frontier

Jan 26

STL9:45 pmLambert-St Louis

16h 53m

1 stop

SFO12:38 pmSan Francisco

Jan 28

SFO2:08 pmSan Francisco

28h 58m

1 stop

STL9:06 pmLambert-St Louis

$151

Find similar

Frontier

Jan 24

STL3:46 pmLambert-St Louis

9h 55m

1 stop

SFO11:41 pmSan Francisco

Jan 31

SFO4:46 pmSan Francisco

25h 51m

1 stop

STL8:37 pmLambert-St Louis

$156

Find similar

Frontier

Jan 31

STL3:46 pmLambert-St Louis

9h 55m

1 stop

SFO11:41 pmSan Francisco

Feb 4

SFO7:00 amSan Francisco

5h 46m

1 stop

STL2:46 pmLambert-St Louis

$165

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Mon 1/26

9:45 pm-12:38 pm

1 stop16h 53m

San Francisco

Wed 1/28

2:08 pm-9:06 pm

1 stop28h 58m

$151

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Sat 1/24

3:46 pm-11:41 pm

1 stop9h 55m

San Francisco

Sat 1/31

4:46 pm-8:37 pm

1 stop25h 51m

$156

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Wed 3/4

4:10 pm-9:50 pm

1 stop7h 40m

San Francisco

Sat 3/7

5:15 am-11:10 am

Nonstop3h 55m

$242

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 3/24

10:45 am-5:36 pm

1 stop8h 51m

San Francisco

Tue 3/31

10:40 pm-8:53 am

1 stop8h 13m

$243

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 5/2

8:55 am-2:55 pm

1 stop8h 00m

San Francisco

Tue 5/5

10:35 pm-8:35 am

1 stop8h 00m

$243

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 1/22

3:35 pm-9:58 pm

1 stop8h 23m

San Francisco

Tue 1/27

10:16 am-11:37 pm

1 stop11h 21m

$244

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 3/14

6:20 pm-11:15 pm

1 stop6h 55m

San Francisco

Wed 3/18

5:40 am-11:40 am

Nonstop4h 00m

$245

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 2/18

9:28 am-5:47 pm

1 stop10h 19m

San Francisco

Wed 2/25

11:23 pm-5:42 am

Nonstop4h 19m

$246

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 1/21

11:46 am-2:37 pm

Nonstop4h 51m

San Francisco

Tue 1/27

6:00 am-12:25 pm

Nonstop4h 25m

$247

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 1/31

3:44 pm-10:47 pm

1 stop9h 03m

San Francisco

Fri 2/6

7:00 am-5:10 pm

1 stop8h 10m

$248

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How to get the cheapest flight ticket from Illinois to San Francisco

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 San Francisco?

If you aren’t able to travel to San Francisco during the month of July, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $288.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Illinois to San Francisco is on a Thursday when prices can be found for as low as $352. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $542.

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

Our data shows that the cheapest Illinois to San Francisco flights are usually those with departure times in the evening. Our users have found flights to San Francisco in the evening for as low as $378. Flights in the afternoon are often more expensive with an average ticket price of $497.

What is the cheapest Illinois to San Francisco flight route?

Fly from Chicago O'Hare Intl to San Francisco for the best Illinois - San Francisco flight prices

How far in advance should I book a flight to San Francisco?

You are more likely to see cheaper flights to San Francisco from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $327 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Illinois for as low as $279 on momondo.

What cabin class options are available on Illinois to San Francisco flights?

There are 4 cabin classes available to choose from on Illinois to San Francisco 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 Illinois to San Francisco flights?

You could potentially save up to 4% on your flight if you consider stops on a Illinois to San Francisco flight.

Cheap Illinois to San Francisco flight deals and tips

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

Best Price Found	$239
Fastest flight time	4h 10m
Direct flights	Every day
Airports in San Francisco	1 airport

The best one-way flight to San Francisco from Illinois in the past 72 hours is $239. The best round-trip flight deal from Illinois to San Francisco found on momondo in the last 72 hours is $296.

The fastest flight from Illinois to San Francisco takes 4h 10m

Direct flights go from Illinois to San Francisco every day.

There is 1 airport in San Francisco. From Illinois there are direct flights to San Francisco (SFO).

Search flight deals

When did momondo last update prices for flights from Illinois to San Francisco Airport?
Prices for flights from Illinois to San Francisco Airport refresh daily.
How many operators does momondo search for flights from Illinois to San Francisco Airport?
As of December 2025, there are 8 operators available to choose from for flights from Illinois to San Francisco Airport.
How old do you have to be to fly from Illinois to San Francisco Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to San Francisco Airport.
What documentation or ID do you need to fly to San Francisco Airport?
The required travel and health documents for your San Francisco Airport 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 San Francisco Airport. 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 Illinois to San Francisco?
Based on momondo bookings for flights between Illinois and San Francisco, the leading plane model is Airbus A321neo, making up 20.39% of the total bookings. Other popular models include Boeing 757-300 with 20.09%, Boeing 737-800 with 14.11%, and Boeing 737 MAX 9 with 11.63%.

Best airlines flying from Illinois to San Francisco

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $90	Free Cancellation	Rating 5.7 3,064 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,820 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $138	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights
Delta	PriceFrom $159	Free Cancellation	Rating 7.9 8,016 reviews	Search Delta flights
JetBlue	PriceFrom $183	Free Cancellation	Rating 7.2 2,901 reviews	Search JetBlue flights
Alaska Airlines	PriceFrom $187	Free Cancellation	Rating 8.0 11,554 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $197	Free Cancellation	Rating 7.2 11,071 reviews	Search American Airlines flights
United Airlines	PriceFrom $204	Free Cancellation	Rating 7.4 9,114 reviews	Search United Airlines flights

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Modesto

Sonoma

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Roseville

Hayward

Calistoga

Big Sur

Santa Clara

Walnut Creek

Berkeley

Daly City

Fremont

Half Moon Bay

Vallejo

Livermore

Salinas

Sunnyvale

Pacifica

Why use momondo?

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

It is quick and easy to find Illinois to San Francisco flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Francisco that suits you.

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

Yes. momondo allows you to filter the results for Illinois to San Francisco flights to just show those with flexible booking policies.

How can momondo help me find flights from Illinois to San Francisco?

Once you have performed a search for Illinois to San Francisco flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to San Francisco from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your San Francisco 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.

Start using Trips

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Flights to Denverfrom $53

Cheap flights from Illinois to San Francisco from $60

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Francisco departing on 1/31. 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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Find the cheapest flights from Illinois to San Francisco

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Alaska Airlines flights from Illinois to San Francisco

Our best Alaska Airlines deals on Illinois to San Francisco flight tickets

Frontier flights from Illinois to San Francisco

Our best Frontier deals on Illinois to San Francisco flight tickets

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

See travel insights to San Francisco from

How to get the cheapest flight ticket from Illinois to San Francisco

What is the cheapest month to fly to San Francisco?

If you aren’t able to travel to San Francisco during the month of July, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $288.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Illinois to San Francisco is on a Thursday when prices can be found for as low as $352. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $542.

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

Our data shows that the cheapest Illinois to San Francisco flights are usually those with departure times in the evening. Our users have found flights to San Francisco in the evening for as low as $378. Flights in the afternoon are often more expensive with an average ticket price of $497.

What is the cheapest Illinois to San Francisco flight route?

Fly from Chicago O'Hare Intl to San Francisco for the best Illinois - San Francisco flight prices

How far in advance should I book a flight to San Francisco?

What cabin class options are available on Illinois to San Francisco flights?

There are 4 cabin classes available to choose from on Illinois to San Francisco 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 Illinois to San Francisco flights?

You could potentially save up to 4% on your flight if you consider stops on a Illinois to San Francisco flight.

What is the cheapest airline that flies from Illinois to San Francisco?

Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Illinois to San Francisco

What airlines fly to San Francisco?

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

65 flights are operational daily from Illinois to San Francisco as of December 2025. The most popular departure time for this route is 5:00PM, with 43% of flights per day taking off in the afternoon.

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

As of December 2025, there are 460 flights per week flying from Illinois to San Francisco. The most common day of the week flights depart is Fri, with 17% of flights taking off on this day.

How long does it take to fly to San Francisco?

Cheap Illinois to San Francisco flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in San Francisco

When did momondo last update prices for flights from Illinois to San Francisco Airport?

How many operators does momondo search for flights from Illinois to San Francisco Airport?

How old do you have to be to fly from Illinois to San Francisco Airport?

What documentation or ID do you need to fly to San Francisco Airport?

What is the most popular plane model from Illinois to San Francisco?

Best airlines flying from Illinois to San Francisco

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

Traveling to a place near San Francisco?

Why use momondo?

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

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

How can momondo help me find flights from Illinois to San Francisco?

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

An easier way to manage your San Francisco 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 the United States

Airports servicing California