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

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

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

As of September 2025, 603 flights take off from San Francisco Bay Area and land in Illinois each week. The most common flight departure day for this route is Fri, with 18% of weekly flights taking off on this day.

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 47% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 8 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 September 2025, there are 86 flights per day flying from San Francisco Bay Area to Illinois. The most common time of day flights depart is 8:00AM, with 53% 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 September 2025, there are 8 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.

$78 Cheap Flights from San Francisco Bay Area to Illinois in 2025/26

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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

5:45 am - 12:15 amSFO-ORD

16h 30m2 stops

7:15 am - 9:29 pmORD-SFO

16h 14m2 stops

$210Frontier

Find Deal

Thu, Nov 6 - Sat, Nov 15

6:34 am - 11:16 pmSFO-ORD

14h 42m1 stop

7:15 am - 10:27 pmORD-SFO

17h 12m1 stop

$211Frontier

Find Deal

Wed, Oct 8 - Wed, Oct 15

8:00 am - 8:48 pmSFO-ORD

10h 48m1 stop

5:25 am - 4:00 pmORD-SFO

12h 35m1 stop

$212Multiple Airlines

Find Deal

Wed, Oct 22 - Mon, Oct 27

7:00 am - 7:54 pmSFO-ORD

10h 54m1 stop

3:05 pm - 11:48 pmORD-SFO

10h 43m1 stop

$214Alaska Airlines

Find Deal

Thu, Dec 11 - Mon, Dec 15

7:00 am - 7:55 pmSFO-ORD

10h 55m1 stop

8:59 pm - 11:01 amORD-SFO

16h 02m1 stop

$215Alaska Airlines

Find Deal

Wed, Nov 5 - Mon, Nov 10

11:18 pm - 5:41 amSFO-ORD

4h 23mnonstop

7:25 am - 1:37 pmORD-SFO

8h 12m1 stop

$243American Airlines

Find Deal

Fri, Nov 14 - Sat, Nov 15

6:30 am - 12:35 pmSFO-MDW

4h 05mnonstop

2:45 pm - 5:15 pmMDW-SFO

4h 30mnonstop

$261Southwest

Find Deal

Tue, Oct 28 - Wed, Oct 29

2:05 pm - 12:05 amSFO-MDW

8h 00m2 stops

7:00 pm - 11:05 pmMDW-SFO

6h 05m1 stop

$268Southwest

Find Deal

Tue, Oct 28 - Wed, Oct 29

8:00 am - 6:36 pmSJC-STL

8h 36m1 stop

2:29 pm - 6:31 pmSTL-SJC

6h 02m1 stop

$337American Airlines

Find Deal

Wed, Oct 29 - Tue, Nov 4

1:00 pm - 10:00 pmSJC-STL

7h 00m1 stop

5:15 am - 9:52 amSTL-SJC

6h 37m1 stop

$388United Airlines

Find Deal

Fri, Oct 17 - Sat, Oct 18

Alaska Airlines flights from San Francisco Bay Area to Illinois

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

Alaska Airlines

Dec 11

SFO7:00 amSan Francisco

10h 54m

1 stop

ORD7:54 pmChicago O'Hare Intl

Dec 15

ORD3:05 pmChicago O'Hare Intl

10h 43m

1 stop

SFO11:48 pmSan Francisco

$214

Find similar

Alaska Airlines

Nov 5

SFO7:00 amSan Francisco

10h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Nov 10

ORD8:59 pmChicago O'Hare Intl

16h 02m

1 stop

SFO11:01 amSan Francisco

$215

Find similar

Alaska Airlines

Nov 13

SJC12:38 pmSan Jose

9h 21m

1 stop

ORD11:59 pmChicago O'Hare Intl

Nov 18

ORD9:20 amChicago O'Hare Intl

7h 03m

1 stop

SJC2:23 pmSan Jose

$216

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Delta flights from San Francisco Bay Area to Illinois

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

Delta

Oct 20

SFO12:35 amSan Francisco

6h 20m

1 stop

MDW8:55 amChicago Midway

Oct 28

MDW1:08 pmChicago Midway

6h 43m

1 stop

SFO5:51 pmSan Francisco

$263

Find similar

Delta

Oct 29

SJC7:15 amSan Jose

9h 25m

2 stops

STL6:40 pmLambert-St Louis

Nov 1

STL12:14 pmLambert-St Louis

11h 54m

2 stops

SJC10:08 pmSan Jose

$264

Find similar

Delta

Oct 22

SJC11:35 amSan Jose

10h 15m

1 stop

ORD11:50 pmChicago O'Hare Intl

Oct 25

ORD2:20 pmChicago O'Hare Intl

9h 48m

1 stop

SJC10:08 pmSan Jose

$273

Find similar

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

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 11/6

5:45 am-12:15 am

2 stops16h 30m

Chicago O'Hare Intl

Sat 11/15

7:15 am-9:29 pm

2 stops16h 14m

$210

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 10/8

6:34 am-11:16 pm

1 stop14h 42m

Chicago O'Hare Intl

Wed 10/15

7:15 am-10:27 pm

1 stop17h 12m

$211

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 10/22

8:00 am-8:48 pm

1 stop10h 48m

Chicago O'Hare Intl

Mon 10/27

5:25 am-4:00 pm

1 stop12h 35m

$212

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 12/11

7:00 am-7:54 pm

1 stop10h 54m

Chicago O'Hare Intl

Mon 12/15

3:05 pm-11:48 pm

1 stop10h 43m

$214

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 11/5

7:00 am-7:55 pm

1 stop10h 55m

Chicago O'Hare Intl

Mon 11/10

8:59 pm-11:01 am

1 stop16h 02m

$215

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Fri 11/14

11:18 pm-5:41 am

Nonstop4h 23m

Chicago O'Hare Intl

Sat 11/15

7:25 am-1:37 pm

1 stop8h 12m

$243

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 10/28

6:30 am-12:35 pm

Nonstop4h 05m

Chicago Midway

Wed 10/29

2:45 pm-5:15 pm

Nonstop4h 30m

$261

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 10/28

2:05 pm-12:05 am

2 stops8h 00m

Chicago Midway

Wed 10/29

7:00 pm-11:05 pm

1 stop6h 05m

$268

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Wed 10/29

8:00 am-6:36 pm

1 stop8h 36m

Lambert-St Louis

Tue 11/4

2:29 pm-6:31 pm

1 stop6h 02m

$337

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Fri 10/17

1:00 pm-10:00 pm

1 stop7h 00m

Lambert-St Louis

Sat 10/18

5:15 am-9:52 am

1 stop6h 37m

$388

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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 February. Flight prices, which tend to average around $284, 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 January is also cheap. Prices for this month can be found on momondo for an average of $308.

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 $404. Flights from San Francisco Bay Area to Illinois on a Sunday will generally be more expensive and average around $508. 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 San Francisco Bay Area to Illinois during this time can be as low as $411. Flights at noon are often more expensive with an average ticket price of $466.

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

Fly from San Francisco to Chicago O'Hare Intl 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 $368 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 $304 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 40m
Direct flights	Every day
Airports in Illinois	2 airports

The fastest flight from San Francisco Bay Area to Illinois takes 3h 40m

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

There are 2 airports near Illinois: Chicago Midway (MDW), Lambert-St Louis (STL)

Search flight deals

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 September 2025, there are 8 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 21.13% of the total bookings. Other popular models include Boeing 737-900 with 9.94%, Airbus A321neo with 7.55%, and Boeing 737 MAX 8 with 7.55%.

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
Frontier	PriceFrom $98	Free Cancellation	Rating 5.8 3,161 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $108	Free Cancellation	Rating 6.3 8,051 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $108	Free Cancellation	Rating 7.8 2,752 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 7,973 reviews	Search Delta flights
United Airlines	PriceFrom $133	Free Cancellation	Rating 7.4 8,928 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $170	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $185	Free Cancellation	Rating 8.0 4,245 reviews	Search Southwest flights
American Airlines	PriceFrom $197	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 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.

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 $50

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Flights to Chicagofrom $65

Flights to Orlandofrom $57

Flights to Las Vegasfrom $49

Flights to San Franciscofrom $60

Flights to Washington, D.C.from $56

Flights to Bostonfrom $72

Flights to Atlantafrom $51

Flights to Dallasfrom $60

Flights to Seattlefrom $86

Cheap flights from San Francisco Bay Area to Illinois from $78

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 San Francisco Bay Area to Illinois

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Cheap last minute flights

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Alaska Airlines flights from San Francisco Bay Area to Illinois

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

Delta flights from San Francisco Bay Area to Illinois

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

momondo Fare Finder

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

See travel insights to Illinois from

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

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 San Francisco Bay Area to Illinois during this time can be as low as $411. Flights at noon are often more expensive with an average ticket price of $466.

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

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

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

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.

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

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

What airlines fly to Illinois?

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

As of September 2025, there are 86 flights per day flying from San Francisco Bay Area to Illinois. The most common time of day flights depart is 8:00AM, with 53% of flights taking off at noon.

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

As of September 2025, 603 flights take off from San Francisco Bay Area and land in Illinois each week. The most common flight departure day for this route is Fri, with 18% of weekly flights taking off on this day.

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

Direct flights

Airports in Illinois

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

How many operators does momondo search 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?

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

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

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

Why use momondo?

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

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

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

I’m not ready to book a flight from San Francisco Bay Area 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