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Cheap flights from San Francisco to Illinois from $61

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Illinois departing on 1/7. 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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0 bags

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Find the cheapest flights from San Francisco to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:24 pm - 12:40 pm
SFO
-
STL
20h 16m1 stop
Frontier Logo
3:43 pm - 8:46 pm
STL
-
SFO
7h 03m1 stop
$142Frontier
Wed, Jan 14 - Sat, Jan 17
Frontier Logo
2:24 pm - 12:40 pm
SFO
-
STL
20h 16m1 stop
Frontier Logo
3:46 pm - 11:41 pm
STL
-
SFO
9h 55m1 stop
$144Frontier
Wed, Jan 14 - Wed, Jan 21
Southwest Logo
5:05 am - 2:45 pm
SFO
-
MDW
7h 40m1 stop
Southwest Logo
8:15 am - 11:15 am
MDW
-
SFO
5h 00mnonstop
$263Southwest
Wed, Jan 7 - Sat, Jan 10
United Airlines Logo
11:56 pm - 6:25 am
SFO
-
ORD
4h 29mnonstop
United Airlines Logo
4:16 pm - 7:09 pm
ORD
-
SFO
4h 53mnonstop
$265United Airlines
Tue, Jan 6 - Thu, Jan 8
Southwest Logo
6:55 am - 12:55 pm
SFO
-
MDW
4h 00mnonstop
Southwest Logo
1:55 pm - 9:50 pm
MDW
-
SFO
9h 55m1 stop
$265Southwest
Sat, Feb 21 - Tue, Feb 24
Alaska Airlines Logo
7:00 am - 11:37 pm
SFO
-
ORD
14h 37m1 stop
Alaska Airlines Logo
9:00 am - 9:55 pm
ORD
-
SFO
14h 55m2 stops
$266Alaska Airlines
Sun, Jan 25 - Sat, Jan 31
United Airlines Logo
5:03 pm - 11:26 pm
SFO
-
ORD
4h 23mnonstop
United Airlines Logo
6:17 pm - 9:20 pm
ORD
-
SFO
5h 03mnonstop
$267United Airlines
Sat, Feb 21 - Mon, Feb 23
American Airlines Logo
9:10 am - 9:07 pm
SFO
-
ORD
9h 57m1 stop
American Airlines Logo
11:46 am - 2:37 pm
ORD
-
SFO
4h 51mnonstop
$268American Airlines
Sat, Jan 17 - Sun, Feb 1
Alaska Airlines Logo
2:52 pm - 11:37 pm
SFO
-
ORD
6h 45m1 stop
Alaska Airlines Logo
2:06 pm - 9:58 pm
ORD
-
SFO
9h 52m2 stops
$270Alaska Airlines
Tue, Jan 20 - Fri, Jan 23
American Airlines Logo
7:00 am - 3:50 pm
SFO
-
PIA
6h 50m1 stop
American Airlines Logo
5:16 pm - 10:34 pm
PIA
-
SFO
7h 18m1 stop
$309American Airlines
Mon, Jan 5 - Mon, Jan 12

United Airlines flights from San Francisco to Illinois

Our best United Airlines deals on San Francisco to Illinois flight tickets
United Airlines
Jan 6
SFO11:56 pmSan Francisco
4h 29m
ORD6:25 amChicago O'Hare Intl
Jan 8
ORD4:16 pmChicago O'Hare Intl
4h 53m
SFO7:09 pmSan Francisco
$265
Find similar
United Airlines
Feb 21
SFO5:03 pmSan Francisco
4h 23m
ORD11:26 pmChicago O'Hare Intl
Feb 23
ORD6:17 pmChicago O'Hare Intl
5h 03m
SFO9:20 pmSan Francisco
$267
Find similar
United Airlines
Jan 8
SFO1:35 pmSan Francisco
4h 30m
ORD8:05 pmChicago O'Hare Intl
Jan 12
ORD2:40 pmChicago O'Hare Intl
4h 56m
SFO5:36 pmSan Francisco
$279
Find similar

Frontier flights from San Francisco to Illinois

Our best Frontier deals on San Francisco to Illinois flight tickets
Frontier
Jan 14
SFO2:24 pmSan Francisco
20h 16m
1 stop
STL12:40 pmLambert-St Louis
Jan 17
STL3:43 pmLambert-St Louis
7h 03m
1 stop
SFO8:46 pmSan Francisco
$142
Find similar
Frontier
Jan 14
SFO2:24 pmSan Francisco
20h 16m
1 stop
STL12:40 pmLambert-St Louis
Jan 21
STL3:46 pmLambert-St Louis
9h 55m
1 stop
SFO11:41 pmSan Francisco
$144
Find similar
Frontier
Jan 14
SFO7:00 amSan Francisco
5h 48m
1 stop
STL2:48 pmLambert-St Louis
Jan 21
STL3:46 pmLambert-St Louis
9h 55m
1 stop
SFO11:41 pmSan Francisco
$148
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from San Francisco 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 December 18, 2025.
Use the filters below to find and compare flights from San Francisco to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 1/14

2:24 pm-12:40 pm

1 stop20h 16m

Lambert-St Louis

Sat 1/17

3:43 pm-8:46 pm

1 stop7h 03m

$142

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 1/14

2:24 pm-12:40 pm

1 stop20h 16m

Lambert-St Louis

Wed 1/21

3:46 pm-11:41 pm

1 stop9h 55m

$144

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Wed 1/7

5:05 am-2:45 pm

1 stop7h 40m

Chicago Midway

Sat 1/10

8:15 am-11:15 am

Nonstop5h 00m

$263

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 1/6

11:56 pm-6:25 am

Nonstop4h 29m

Chicago O'Hare Intl

Thu 1/8

4:16 pm-7:09 pm

Nonstop4h 53m

$265

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Sat 2/21

6:55 am-12:55 pm

Nonstop4h 00m

Chicago Midway

Tue 2/24

1:55 pm-9:50 pm

1 stop9h 55m

$265

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sun 1/25

7:00 am-11:37 pm

1 stop14h 37m

Chicago O'Hare Intl

Sat 1/31

9:00 am-9:55 pm

2 stops14h 55m

$266

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sat 2/21

5:03 pm-11:26 pm

Nonstop4h 23m

Chicago O'Hare Intl

Mon 2/23

6:17 pm-9:20 pm

Nonstop5h 03m

$267

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sat 1/17

9:10 am-9:07 pm

1 stop9h 57m

Chicago O'Hare Intl

Sun 2/1

11:46 am-2:37 pm

Nonstop4h 51m

$268

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 1/20

2:52 pm-11:37 pm

1 stop6h 45m

Chicago O'Hare Intl

Fri 1/23

2:06 pm-9:58 pm

2 stops9h 52m

$270

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Mon 1/5

7:00 am-3:50 pm

1 stop6h 50m

Greater Peoria

Mon 1/12

5:16 pm-10:34 pm

1 stop7h 18m

$309

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 San Francisco 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 San Francisco is in February. Flight prices, which tend to average around $282, 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 September is also cheap. Prices for this month can be found on momondo for an average of $291.

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

The cheapest day to depart from San Francisco to Illinois is on a Wednesday when prices can be found for as low as $405. Flights from San Francisco to Illinois on a Sunday will generally be more expensive and average around $498. 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 to Illinois during this time can be as low as $410. Flights at noon are often more expensive with an average ticket price of $462.

What is the cheapest San Francisco to Illinois flight route?

Fly from San Francisco to Chicago Midway for the best San Francisco - 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 when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $371 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 for as low as $293 on momondo.

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

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

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

Cheap San Francisco to Illinois flight deals and tips

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

Best Price Found

$186

Fastest flight time

3h 45m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from San Francisco in the past 72 hours is $186. The best round-trip flight deal from San Francisco to Illinois found on momondo in the last 72 hours is $366.
The fastest flight from San Francisco to Illinois takes 3h 45m
Direct flights go from San Francisco to Illinois every day.
There are 98 airports in Illinois. From San Francisco there are direct flights to Chicago Midway (MDW), Lambert-St Louis (STL).
Search flight deals

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

    Prices for flights from San Francisco Airport to Illinois were last updated today.

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

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

Best airlines flying from San Francisco to Illinois

Compare and see reviews for airlines that fly from San Francisco to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Hawaiian AirlinesPriceFrom $108Free CancellationRating
7.8
2,820 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $128Free CancellationRating
5.8
3,080 reviews
Search Frontier flights
DeltaPriceFrom $128Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $133Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
SouthwestPriceFrom $185Free CancellationRating
7.9
4,252 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $196Free CancellationRating
8.0
11,479 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $197Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from San Francisco to Illinois for you.

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

Yes. momondo enables you to select and highlight flights to Illinois from San Francisco with this policy.

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

momondo helps you find the best flight between San Francisco and Illinois by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from San Francisco and alert you when they 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.
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Sat 1/17
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Find better results for your trip to Illinois

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