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Cheap flights from San Francisco to Illinois from $108

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 10/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 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
12:07 pm - 12:45 amSFO  San Francisco-ORD Chicago O'Hare Intl
10h 38m2 stops Los Angeles Dallas/Fort Worth
Frontier Logo
8:55 pm - 8:14 amORD  Chicago O'Hare Intl-SFO San Francisco
13h 19m1 stop Las Vegas Harry Reid Intl
$279Frontier
Thu, Sep 24 - Mon, Sep 28
Frontier Logo
9:00 am - 12:23 amSFO  San Francisco-ORD Chicago O'Hare Intl
13h 23m2 stops Los Angeles Denver Intl
Frontier Logo
6:30 am - 10:47 amORD  Chicago O'Hare Intl-SFO San Francisco
6h 17m1 stop Denver Intl
$280Frontier
Fri, Sep 11 - Sun, Sep 13
Multiple Airlines Logo
11:17 am - 8:39 pmSFO  San Francisco-RFD Chicago Greater Rockford
7h 22m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
9:29 pm - 8:14 amRFD  Chicago Greater Rockford-SFO San Francisco
12h 45m1 stop Las Vegas Harry Reid Intl
$280Multiple Airlines
Thu, Sep 10 - Sun, Sep 13
Multiple Airlines Logo
6:22 am - 8:13 pmSFO  San Francisco-RFD Chicago Greater Rockford
11h 51m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
9:33 pm - 8:23 amRFD  Chicago Greater Rockford-SFO San Francisco
12h 50m1 stop Las Vegas Harry Reid Intl
$281Multiple Airlines
Thu, Oct 15 - Sun, Oct 18
Southwest Logo
6:00 pm - 4:30 amSFO  San Francisco-MDW Chicago Midway
8h 30m1 stop San Diego
Southwest Logo
7:55 am - 3:50 pmMDW  Chicago Midway-SFO San Francisco
9h 55m2 stops Detroit Metropolitan Wayne County Nashville Intl
$282Southwest
Tue, Sep 8 - Sat, Sep 12
Southwest Logo
5:40 am - 5:10 pmSFO  San Francisco-MDW Chicago Midway
9h 30m2 stops Phoenix Sky Harbor Intl Tulsa
Southwest Logo
6:15 am - 1:10 pmMDW  Chicago Midway-SFO San Francisco
8h 55m1 stop San Diego
$282Southwest
Tue, Sep 22 - Mon, Sep 28
United Airlines Logo
3:10 pm - 9:34 pmSFO  San Francisco-ORD Chicago O'Hare Intl
4h 24mnonstop
United Airlines Logo
8:40 am - 11:20 amORD  Chicago O'Hare Intl-SFO San Francisco
4h 40mnonstop
$287United Airlines
Fri, Sep 4 - Sun, Sep 6
American Airlines Logo
2:58 pm - 9:35 pmSFO  San Francisco-ORD Chicago O'Hare Intl
4h 37mnonstop
American Airlines Logo
9:06 pm - 11:56 pmORD  Chicago O'Hare Intl-SFO San Francisco
4h 50mnonstop
$287American Airlines
Fri, Sep 11 - Mon, Sep 14
American Airlines Logo
5:07 pm - 11:30 pmSFO  San Francisco-ORD Chicago O'Hare Intl
4h 23mnonstop
American Airlines Logo
6:59 pm - 9:52 pmORD  Chicago O'Hare Intl-SFO San Francisco
4h 53mnonstop
$287American Airlines
Sat, Sep 5 - Mon, Sep 14
United Airlines Logo
6:38 pm - 12:59 amSFO  San Francisco-ORD Chicago O'Hare Intl
4h 21mnonstop
United Airlines Logo
4:00 pm - 6:49 pmORD  Chicago O'Hare Intl-SFO San Francisco
4h 49mnonstop
$297United Airlines
Fri, Aug 28 - Mon, Aug 31

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Alaska Airlines flights from San Francisco to Illinois

Our best Alaska Airlines deals on San Francisco to Illinois flight tickets
Alaska Airlines
Sep 11
SFO8:25 amSan Francisco
8h 56m
1 stop
ORD7:21 pmChicago O'Hare Intl
Sep 16
ORD7:20 amChicago O'Hare Intl
9h 25m
1 stop
SFO2:45 pmSan Francisco
$287
Alaska Airlines
Aug 22
SFO10:32 amSan Francisco
6h 49m
1 stop
ORD7:21 pmChicago O'Hare Intl
Aug 29
ORD6:01 amChicago O'Hare Intl
6h 52m
1 stop
SFO10:53 amSan Francisco
$301
Alaska Airlines
Aug 24
SFO3:25 pmSan Francisco
6h 34m
1 stop
ORD11:59 pmChicago O'Hare Intl
Aug 30
ORD8:17 pmChicago O'Hare Intl
14h 29m
1 stop
SFO8:46 amSan Francisco
$310

Frontier flights from San Francisco to Illinois

Our best Frontier deals on San Francisco to Illinois flight tickets
Frontier
Sep 24
SFO12:07 pmSan Francisco
10h 38m
2 stops
ORD12:45 amChicago O'Hare Intl
Sep 28
ORD8:55 pmChicago O'Hare Intl
13h 19m
1 stop
SFO8:14 amSan Francisco
$279
Frontier
Sep 11
SFO9:00 amSan Francisco
13h 23m
2 stops
ORD12:23 amChicago O'Hare Intl
Sep 13
ORD6:30 amChicago O'Hare Intl
6h 17m
1 stop
SFO10:47 amSan Francisco
$280
Frontier
Aug 27
SFO8:23 pmSan Francisco
7h 36m
1 stop
ORD5:59 amChicago O'Hare Intl
Aug 28
ORD2:41 pmChicago O'Hare Intl
11h 37m
1 stop
SFO12:18 amSan Francisco
$281

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 August 6, 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

Cheapest round-trip

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Thu 9/24

12:07 pm-12:45 am

2 stops10h 38m

Chicago O'Hare Intl

Mon 9/28

8:55 pm-8:14 am

1 stop13h 19m

$279

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Fri 9/11

9:00 am-12:23 am

2 stops13h 23m

Chicago O'Hare Intl

Sun 9/13

6:30 am-10:47 am

1 stop6h 17m

$280

San FranciscoChicago

SFO San Francisco - RFD Chicago Greater Rockford

SFORFD

San Francisco

Thu 9/10

11:17 am-8:39 pm

1 stop7h 22m

Chicago Greater Rockford

Sun 9/13

9:29 pm-8:14 am

1 stop12h 45m

$280

San FranciscoChicago

SFO San Francisco - RFD Chicago Greater Rockford

SFORFD

San Francisco

Thu 10/15

6:22 am-8:13 pm

1 stop11h 51m

Chicago Greater Rockford

Sun 10/18

9:33 pm-8:23 am

1 stop12h 50m

$281

San FranciscoChicago

SFO San Francisco - MDW Chicago Midway

SFOMDW

San Francisco

Tue 9/8

6:00 pm-4:30 am

1 stop8h 30m

Chicago Midway

Sat 9/12

7:55 am-3:50 pm

2 stops9h 55m

$282

San FranciscoChicago

SFO San Francisco - MDW Chicago Midway

SFOMDW

San Francisco

Tue 9/22

5:40 am-5:10 pm

2 stops9h 30m

Chicago Midway

Mon 9/28

6:15 am-1:10 pm

1 stop8h 55m

$282
Quickest round-trip

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Fri 9/4

3:10 pm-9:34 pm

Nonstop4h 24m

Chicago O'Hare Intl

Sun 9/6

8:40 am-11:20 am

Nonstop4h 40m

$287

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Fri 9/11

2:58 pm-9:35 pm

Nonstop4h 37m

Chicago O'Hare Intl

Mon 9/14

9:06 pm-11:56 pm

Nonstop4h 50m

$287

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Sat 9/5

5:07 pm-11:30 pm

Nonstop4h 23m

Chicago O'Hare Intl

Mon 9/14

6:59 pm-9:52 pm

Nonstop4h 53m

$287

San FranciscoChicago

SFO San Francisco - ORD Chicago O'Hare Intl

SFOORD

San Francisco

Fri 8/28

6:38 pm-12:59 am

Nonstop4h 21m

Chicago O'Hare Intl

Mon 8/31

4:00 pm-6:49 pm

Nonstop4h 49m

$297

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 $345, 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 $372.

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 $443. Flights from San Francisco to Illinois on a Sunday will generally be more expensive and average around $572. 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 $468. Flights at noon are often more expensive with an average ticket price of $510.

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 from San Francisco 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 $425 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 $348 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 11% 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

$208

Fastest flight time

3h 50m

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 $208. The best round-trip flight deal from San Francisco to Illinois found on momondo in the last 72 hours is $354.
The fastest flight from San Francisco to Illinois takes 3h 50m
Direct flights go from San Francisco to Illinois every day.
There are 98 airports in Illinois. From San Francisco there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from San Francisco to Illinois

  • 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
DeltaPriceFrom $122Free CancellationRating
7.8
8,499 reviews
Search Delta flights
FrontierPriceFrom $146Free CancellationRating
5.6
2,723 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $195Free CancellationRating
7.9
12,774 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $222Free CancellationRating
7.1
11,869 reviews
Search American Airlines flights
JetBluePriceFrom $224Free CancellationRating
7.1
3,024 reviews
Search JetBlue flights
United AirlinesPriceFrom $252Free CancellationRating
7.4
10,073 reviews
Search United Airlines flights
SouthwestPriceFrom $266Free CancellationRating
8.0
4,221 reviews
Search Southwest 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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Find better results for your trip to Illinois

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