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Cheap flights from San Francisco to Illinois from $58

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 3/10. 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
9:04 pm - 9:49 am
SFO
-
STL
10h 45m
1 stop
Frontier Logo
8:12 pm - 8:09 pm
STL
-
SFO
25h 57m
1 stop
$151Frontier
Fri, Mar 6 - Mon, Mar 9
Frontier Logo
9:04 pm - 9:49 am
SFO
-
STL
10h 45m
1 stop
Frontier Logo
8:12 pm - 12:28 am
STL
-
SFO
30h 16m
1 stop
$156Frontier
Tue, Mar 10 - Mon, Mar 16
Frontier Logo
7:20 am - 3:53 pm
SFO
-
STL
6h 33m
1 stop
Frontier Logo
2:51 pm - 12:28 am
STL
-
SFO
11h 37m
1 stop
$158Frontier
Wed, Feb 25 - Sat, Feb 28
American Airlines Logo
6:00 am - 12:24 pm
SFO
-
ORD
4h 24mnonstop
American Airlines Logo
6:45 am - 9:40 am
ORD
-
SFO
4h 55mnonstop
$250American Airlines
Wed, Feb 25 - Fri, Feb 27
Southwest Logo
5:25 am - 11:35 am
SFO
-
MDW
4h 10mnonstop
Southwest Logo
6:10 pm - 8:45 pm
MDW
-
SFO
4h 35mnonstop
$250Southwest
Tue, Apr 14 - Sat, Apr 18
Southwest Logo
1:50 pm - 11:25 pm
SFO
-
MDW
7h 35m
1 stop
Southwest Logo
5:15 pm - 11:05 pm
MDW
-
SFO
7h 50m
1 stop
$251Southwest
Sat, May 9 - Mon, May 11
Alaska Airlines Logo
8:59 pm - 6:39 am
SFO
-
ORD
7h 40m
1 stop
Alaska Airlines Logo
4:10 pm - 10:52 pm
ORD
-
SFO
8h 42m
1 stop
$252Alaska Airlines
Mon, Apr 6 - Tue, Apr 14
United Airlines Logo
11:30 pm - 8:46 am
SFO
-
DEC
7h 16m
1 stop
United Airlines Logo
6:55 pm - 12:30 am
DEC
-
SFO
7h 35m
1 stop
$304United Airlines
Tue, Jun 9 - Tue, Jun 16
United Airlines Logo
11:59 pm - 9:03 am
SFO
-
PIA
7h 04m
1 stop
United Airlines Logo
2:20 pm - 7:34 pm
PIA
-
SFO
7h 14m
1 stop
$309United Airlines
Sat, Mar 7 - Wed, Mar 11
American Airlines Logo
6:00 am - 2:17 pm
SFO
-
PIA
6h 17m
1 stop
American Airlines Logo
5:15 am - 2:34 pm
PIA
-
SFO
11h 19m
2 stops
$314American Airlines
Sat, Mar 7 - Wed, Mar 11

Alaska Airlines flights from San Francisco to Illinois

Our best Alaska Airlines deals on San Francisco to Illinois flight tickets
Alaska Airlines
Apr 6
SFO8:59 pmSan Francisco
7h 40m
1 stop
ORD6:39 amChicago O'Hare Intl
Apr 14
ORD4:10 pmChicago O'Hare Intl
8h 42m
1 stop
SFO10:52 pmSan Francisco
$252
Alaska Airlines
Apr 5
SFO6:30 amSan Francisco
9h 56m
1 stop
ORD6:26 pmChicago O'Hare Intl
Apr 14
ORD4:10 pmChicago O'Hare Intl
8h 42m
1 stop
SFO10:52 pmSan Francisco
$270
Alaska Airlines
Mar 31
SFO10:16 amSan Francisco
11h 43m
2 stops
ORD11:59 pmChicago O'Hare Intl
Apr 15
ORD4:10 pmChicago O'Hare Intl
8h 42m
1 stop
SFO10:52 pmSan Francisco
$275

American Airlines flights from San Francisco to Illinois

Our best American Airlines deals on San Francisco to Illinois flight tickets
American Airlines
Feb 25
SFO6:00 amSan Francisco
4h 24m
ORD12:24 pmChicago O'Hare Intl
Mar 2
ORD6:45 amChicago O'Hare Intl
4h 55m
SFO9:40 amSan Francisco
$250
American Airlines
Feb 21
SFO9:25 amSan Francisco
9h 42m
1 stop
ORD9:07 pmChicago O'Hare Intl
Feb 25
ORD8:48 pmChicago O'Hare Intl
4h 59m
SFO11:47 pmSan Francisco
$258
American Airlines
Apr 14
SFO1:28 pmSan Francisco
4h 44m
ORD8:12 pmChicago O'Hare Intl
Apr 19
ORD9:01 pmChicago O'Hare Intl
4h 58m
SFO11:59 pmSan Francisco
$272

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 February 3, 2026.
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

Fri 3/6

9:04 pm-9:49 am

1 stop10h 45m

Lambert-St Louis

Mon 3/9

8:12 pm-8:09 pm

1 stop25h 57m

$151

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 3/10

9:04 pm-9:49 am

1 stop10h 45m

Lambert-St Louis

Mon 3/16

8:12 pm-12:28 am

1 stop30h 16m

$156

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 2/25

7:20 am-3:53 pm

1 stop6h 33m

Lambert-St Louis

Sat 2/28

2:51 pm-12:28 am

1 stop11h 37m

$158

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 2/25

6:00 am-12:24 pm

Nonstop4h 24m

Chicago O'Hare Intl

Fri 2/27

6:45 am-9:40 am

Nonstop4h 55m

$250

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 4/14

5:25 am-11:35 am

Nonstop4h 10m

Chicago Midway

Sat 4/18

6:10 pm-8:45 pm

Nonstop4h 35m

$250

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Sat 5/9

1:50 pm-11:25 pm

1 stop7h 35m

Chicago Midway

Mon 5/11

5:15 pm-11:05 pm

1 stop7h 50m

$251

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Mon 4/6

8:59 pm-6:39 am

1 stop7h 40m

Chicago O'Hare Intl

Tue 4/14

4:10 pm-10:52 pm

1 stop8h 42m

$252

San FranciscoDecatur

SFO - DEC

SFODEC

San Francisco

Tue 6/9

11:30 pm-8:46 am

1 stop7h 16m

Decatur Arpt

Tue 6/16

6:55 pm-12:30 am

1 stop7h 35m

$304

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Sat 3/7

11:59 pm-9:03 am

1 stop7h 04m

Greater Peoria

Wed 3/11

2:20 pm-7:34 pm

1 stop7h 14m

$309

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Sat 3/7

6:00 am-2:17 pm

1 stop6h 17m

Greater Peoria

Wed 3/11

5:15 am-2:34 pm

2 stops11h 19m

$314

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 September. Flight prices, which tend to average around $291, 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 February is also cheap. Prices for this month can be found on momondo for an average of $297.

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 $406. Flights from San Francisco to Illinois on a Sunday will generally be more expensive and average around $494. 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 $409. Flights at noon are often more expensive with an average ticket price of $457.

What is the cheapest San Francisco to Illinois flight route?

Fly from San Francisco to Chicago O'Hare Intl 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 $378 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 $299 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?

You could potentially save up to 14% on your flight if you consider stops on a San Francisco to Illinois flight.

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

$154

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 $154. The best round-trip flight deal from San Francisco to Illinois found on momondo in the last 72 hours is $324.
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 $101Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $126Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
DeltaPriceFrom $128Free CancellationRating
7.9
8,136 reviews
Search Delta flights
United AirlinesPriceFrom $133Free CancellationRating
7.4
9,232 reviews
Search United Airlines flights
SouthwestPriceFrom $185Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $196Free CancellationRating
8.0
11,832 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $197Free CancellationRating
7.2
11,215 reviews
Search American Airlines flights
JetBluePriceFrom $234Free CancellationRating
7.2
2,893 reviews
Search JetBlue 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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