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

As of April 2026, 613 flights take off from San Francisco Bay Area and land in Illinois each week. The most common flight departure day for this route is Sun, with 18% of weekly flights taking off on this day.

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

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

What airlines fly to Illinois?

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to Illinois from San Francisco Bay Area according to our data. United Airlines is the first choice among our users, with 46% 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 San Francisco Bay Area to Illinois on average per day?

As of April 2026, there are 87 flights per day flying from San Francisco Bay Area to Illinois. The most common time of day flights depart is 10:00AM, with 37% of flights taking off at noon.

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

Prices for flights from San Francisco Bay Area to Illinois are updated daily.

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

As of April 2026, there are 9 operators available to choose from for flights from San Francisco Bay Area to Illinois.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Bay Area to Illinois.

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

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$92 Cheap Flights from San Francisco Bay Area to Illinois in 2026

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Find the cheapest flights from San Francisco Bay Area to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:22 pm - 6:06 pm

SJC

STL

19h 44m

1 stop

12:36 pm - 1:17 pm

STL

SJC

26h 41m

1 stop

$180Frontier

Mon, May 4 - Sun, May 10

8:22 pm - 6:06 pm

SJC

STL

19h 44m

1 stop

9:06 pm - 1:17 pm

STL

SJC

18h 11m

1 stop

$191Frontier

Mon, May 4 - Fri, May 22

11:55 pm - 6:00 am

OAK

MDW

4h 05mnonstop

8:50 pm - 11:25 pm

MDW

OAK

4h 35mnonstop

$237Southwest

Wed, May 27 - Wed, Jun 3

2:12 pm - 8:11 pm

SJC

STL

27h 59m

1 stop

9:06 pm - 1:17 pm

STL

SJC

18h 11m

1 stop

$241Frontier

Thu, Jun 4 - Sun, Jun 7

5:50 am - 11:55 am

OAK

MDW

4h 05mnonstop

4:00 pm - 9:45 pm

MDW

OAK

7h 45m

1 stop

$247Southwest

Wed, May 27 - Wed, Jun 3

2:58 pm - 1:14 pm

OAK

ORD

20h 16m

1 stop

9:00 am - 2:14 pm

ORD

OAK

7h 14m

1 stop

$257Alaska Airlines

Wed, May 27 - Wed, Jun 3

11:30 pm - 5:57 am

SFO

ORD

4h 27mnonstop

10:45 pm - 1:42 am

ORD

SFO

4h 57mnonstop

$265United Airlines

Thu, May 28 - Mon, Jun 1

7:06 am - 6:50 pm

SJC

ORD

9h 44m

1 stop

2:10 pm - 7:22 pm

ORD

SJC

7h 12m

1 stop

$271Alaska Airlines

Thu, May 28 - Wed, Jun 3

12:15 am - 8:42 am

SFO

MDW

6h 27m

1 stop

5:15 pm - 11:24 pm

MDW

SFO

8h 09m

1 stop

$271Delta

Wed, May 20 - Wed, Jun 3

11:39 am - 8:31 pm

SFO

ORD

6h 52m

1 stop

7:35 am - 1:26 pm

ORD

SFO

7h 51m

1 stop

$271Delta

Sun, Jul 5 - Wed, Jul 8

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American Airlines flights from San Francisco Bay Area to Illinois

Our best American Airlines deals on San Francisco Bay Area to Illinois flight tickets

American Airlines

Jun 16

SFO6:00 amSan Francisco

4h 35m

ORD12:35 pmChicago O'Hare Intl

Jun 23

ORD9:04 pmChicago O'Hare Intl

4h 51m

SFO11:55 pmSan Francisco

$282

American Airlines

May 28

SFO11:14 pmSan Francisco

4h 47m

ORD6:01 amChicago O'Hare Intl

Jun 9

ORD9:04 pmChicago O'Hare Intl

4h 51m

SFO11:55 pmSan Francisco

$286

American Airlines

May 7

SFO4:15 pmSan Francisco

6h 17m

1 stop

ORD12:32 amChicago O'Hare Intl

May 13

ORD8:05 amChicago O'Hare Intl

4h 57m

SFO11:02 amSan Francisco

$297

United Airlines flights from San Francisco Bay Area to Illinois

Our best United Airlines deals on San Francisco Bay Area to Illinois flight tickets

United Airlines

May 28

SFO11:30 pmSan Francisco

4h 27m

ORD5:57 amChicago O'Hare Intl

Jun 1

ORD10:45 pmChicago O'Hare Intl

4h 57m

SFO1:42 amSan Francisco

$265

United Airlines

May 27

SFO10:35 pmSan Francisco

4h 23m

ORD4:58 amChicago O'Hare Intl

Jun 3

ORD6:10 amChicago O'Hare Intl

4h 37m

SFO8:47 amSan Francisco

$283

United Airlines

May 7

SFO12:45 amSan Francisco

4h 22m

ORD7:07 amChicago O'Hare Intl

May 12

ORD6:20 amChicago O'Hare Intl

4h 51m

SFO9:11 amSan Francisco

$295

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Mon 5/4

8:22 pm-6:06 pm

1 stop19h 44m

Lambert-St Louis

Sun 5/10

12:36 pm-1:17 pm

1 stop26h 41m

$180

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Mon 5/4

8:22 pm-6:06 pm

1 stop19h 44m

Lambert-St Louis

Fri 5/22

9:06 pm-1:17 pm

1 stop18h 11m

$191

Quickest round-trip

OaklandChicago

OAK - MDW

OAKMDW

Oakland

Wed 5/27

11:55 pm-6:00 am

Nonstop4h 05m

Chicago Midway

Wed 6/3

8:50 pm-11:25 pm

Nonstop4h 35m

$237

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Thu 6/4

2:12 pm-8:11 pm

1 stop27h 59m

Lambert-St Louis

Sun 6/7

9:06 pm-1:17 pm

1 stop18h 11m

$241

OaklandChicago

OAK - MDW

OAKMDW

Oakland

Wed 5/27

5:50 am-11:55 am

Nonstop4h 05m

Chicago Midway

Wed 6/3

4:00 pm-9:45 pm

1 stop7h 45m

$247

OaklandChicago

OAK - ORD

OAKORD

Oakland

Wed 5/27

2:58 pm-1:14 pm

1 stop20h 16m

Chicago O'Hare Intl

Wed 6/3

9:00 am-2:14 pm

1 stop7h 14m

$257

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 5/28

11:30 pm-5:57 am

Nonstop4h 27m

Chicago O'Hare Intl

Mon 6/1

10:45 pm-1:42 am

Nonstop4h 57m

$265

San JoseChicago

SJC - ORD

SJCORD

San Jose

Thu 5/28

7:06 am-6:50 pm

1 stop9h 44m

Chicago O'Hare Intl

Wed 6/3

2:10 pm-7:22 pm

1 stop7h 12m

$271

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Wed 5/20

12:15 am-8:42 am

1 stop6h 27m

Chicago Midway

Wed 6/3

5:15 pm-11:24 pm

1 stop8h 09m

$271

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sun 7/5

11:39 am-8:31 pm

1 stop6h 52m

Chicago O'Hare Intl

Wed 7/8

7:35 am-1:26 pm

1 stop7h 51m

$271

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 San Francisco Bay Area 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 San Francisco Bay Area is in September. Flight prices, which tend to average around $293, 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 August is also cheap. Prices for this month can be found on momondo for an average of $336.

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

The cheapest day to depart from San Francisco Bay Area to Illinois is on a Wednesday when prices can be found for as low as $414. Flights from San Francisco Bay Area to Illinois on a Sunday will generally be more expensive and average around $530. 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 evening. Flights from San Francisco Bay Area to Illinois during this time can be as low as $424. Flights at noon are often more expensive with an average ticket price of $462.

What is the cheapest San Francisco Bay Area to Illinois flight route?

Fly from San Jose to Chicago Midway for the best San Francisco Bay Area - 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 San Francisco Bay Area when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $391 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from San Francisco Bay Area for as low as $315 on momondo.

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

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

No. A direct flight is the cheapest option for a flight between San Francisco Bay Area to Illinois.

Cheap San Francisco Bay Area to Illinois flight deals and tips

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

Fastest flight time	3h 50m
Direct flights	Every day
Airports in Illinois	98 airports

The fastest flight from San Francisco Bay Area to Illinois takes 3h 50m

Direct flights go from San Francisco Bay Area to Illinois every day.

There are 98 airports in Illinois. From San Francisco Bay Area there are direct flights to Chicago Midway (MDW), Lambert-St Louis (STL).

Search flight deals

Frequently asked questions about flying from San Francisco Bay Area to Illinois

When did momondo last update prices for flights from San Francisco Bay Area to Illinois?
Prices for flights from San Francisco Bay Area to Illinois are updated daily.
How many operators does momondo search for flights from San Francisco Bay Area to Illinois?
As of April 2026, there are 9 operators available to choose from for flights from San Francisco Bay Area to Illinois.
How old do you have to be to fly from San Francisco Bay Area to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Bay Area to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from San Francisco Bay Area to Illinois?
Based on momondo bookings for flights between San Francisco Bay Area and Illinois, the leading plane model is Boeing 737-800, making up 19.29% of the total bookings. Other popular models include Airbus A321neo with 13.11%, Boeing 737-900 with 8.81%, and Boeing 737 MAX 8 with 8.46%.

Best airlines flying from San Francisco Bay Area to Illinois

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

Airline	Rating	Free Cancellation	Price
Hawaiian Airlines	PriceFrom $101	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
Spirit Airlines	PriceFrom $121	Free Cancellation	Rating 6.3 8,624 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $127	Free Cancellation	Rating 5.7 2,985 reviews	Search Frontier flights
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 8,422 reviews	Search Delta flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 9,604 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $170	Free Cancellation	Rating 7.9 12,260 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $185	Free Cancellation	Rating 8.0 4,328 reviews	Search Southwest flights
American Airlines	PriceFrom $197	Free Cancellation	Rating 7.1 11,620 reviews	Search American Airlines flights
JetBlue	PriceFrom $225	Free Cancellation	Rating 7.2 2,945 reviews	Search JetBlue flights

Why use momondo?

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

Finding the right flight to Illinois from San Francisco Bay Area is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

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

Flights from San Francisco Bay Area 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 San Francisco Bay Area to Illinois?

momondo provides multiple filters to help you find the best flight to Illinois from San Francisco Bay Area. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of San Francisco Bay Area to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.