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Cheap flights from San Francisco to Illinois from $71

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 9/8. 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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Find the cheapest flights from San Francisco to Illinois

Cheap round-trip flights

Frontier Logo
1:29 pm - 10:24 pmSFO-ORD
6h 55m1 stop
Frontier Logo
6:50 am - 11:34 amORD-SFO
6h 44m1 stop
$148Frontier
Find Deal
Fri, Oct 17 - Mon, Oct 20
Frontier Logo
1:15 pm - 9:06 amSFO-STL
17h 51m1 stop
Frontier Logo
7:55 pm - 10:30 pmSTL-SFO
28h 35m1 stop
$149Frontier
Find Deal
Fri, Sep 5 - Mon, Sep 8
Frontier Logo
7:10 am - 9:06 amSFO-STL
23h 56m1 stop
Frontier Logo
7:55 pm - 1:17 pmSTL-SFO
19h 22m1 stop
$150Frontier
Find Deal
Wed, Oct 1 - Sun, Oct 5
American Airlines Logo
6:10 am - 12:30 pmSFO-ORD
4h 20mnonstop
American Airlines Logo
6:45 am - 9:24 amORD-SFO
4h 39mnonstop
$190American Airlines
Find Deal
Sun, Aug 31 - Sat, Sep 6
Hawaiian Airlines Logo
10:26 am - 11:59 pmSFO-ORD
11h 33m1 stop
Hawaiian Airlines Logo
8:20 am - 2:01 pmORD-SFO
7h 41m1 stop
$196Hawaiian Airlines
Find Deal
Wed, Oct 8 - Wed, Oct 22
American Airlines Logo
12:47 am - 6:56 amSFO-ORD
4h 09mnonstop
American Airlines Logo
6:45 am - 9:24 amORD-SFO
4h 39mnonstop
$197American Airlines
Find Deal
Tue, Sep 16 - Wed, Oct 1
Southwest Logo
6:30 am - 12:35 pmSFO-MDW
4h 05mnonstop
Southwest Logo
8:15 am - 11:00 amMDW-SFO
4h 45mnonstop
$197Southwest
Find Deal
Tue, Oct 21 - Wed, Nov 5
Southwest Logo
6:00 am - 12:05 pmSFO-MDW
4h 05mnonstop
Southwest Logo
8:15 am - 11:00 amMDW-SFO
4h 45mnonstop
$207Southwest
Find Deal
Mon, Oct 27 - Sat, Nov 15
United Airlines Logo
11:10 pm - 10:13 amSFO-PIA
9h 03m1 stop
United Airlines Logo
8:10 am - 1:35 pmPIA-SFO
7h 25m1 stop
$314United Airlines
Find Deal
Mon, Sep 1 - Wed, Sep 10
United Airlines Logo
11:10 pm - 10:13 amSFO-PIA
9h 03m1 stop
United Airlines Logo
8:10 am - 1:35 pmPIA-SFO
7h 25m1 stop
$374United Airlines
Find Deal
Sat, Aug 30 - Wed, Sep 3

Frontier flights from San Francisco to Illinois

Our best Frontier deals on San Francisco to Illinois flight tickets
Frontier
Oct 17
SFO1:29 pmSan Francisco
6h 55m
1 stop
ORD10:24 pmChicago O'Hare Intl
Oct 20
ORD6:50 amChicago O'Hare Intl
6h 44m
1 stop
SFO11:34 amSan Francisco
$148
Find similar
Frontier
Sep 5
SFO1:15 pmSan Francisco
17h 51m
1 stop
STL9:06 amLambert-St Louis
Sep 8
STL7:55 pmLambert-St Louis
28h 35m
1 stop
SFO10:30 pmSan Francisco
$149
Find similar
Frontier
Sep 11
SFO2:17 pmSan Francisco
6h 58m
1 stop
ORD11:15 pmChicago O'Hare Intl
Sep 22
ORD6:00 amChicago O'Hare Intl
9h 17m
1 stop
SFO1:17 pmSan Francisco
$150
Find similar

American Airlines flights from San Francisco to Illinois

Our best American Airlines deals on San Francisco to Illinois flight tickets
American Airlines
Aug 31
SFO6:10 amSan Francisco
4h 20m
ORD12:30 pmChicago O'Hare Intl
Sep 6
ORD6:45 amChicago O'Hare Intl
4h 39m
SFO9:24 amSan Francisco
$190
Find similar
American Airlines
Sep 16
SFO12:47 amSan Francisco
4h 09m
ORD6:56 amChicago O'Hare Intl
Oct 1
ORD6:45 amChicago O'Hare Intl
4h 39m
SFO9:24 amSan Francisco
$197
Find similar
American Airlines
Sep 12
SFO12:30 pmSan Francisco
7h 55m
1 stop
MLI10:25 pmMoline Quad-City
Sep 19
MLI5:40 pmMoline Quad-City
7h 35m
1 stop
SFO11:15 pmSan Francisco
$289
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 August 16, 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 FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Fri 10/17

1:29 pm-10:24 pm

1 stop6h 55m

Chicago O'Hare Intl

Mon 10/20

6:50 am-11:34 am

1 stop6h 44m

$148

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 9/5

1:15 pm-9:06 am

1 stop17h 51m

Lambert-St Louis

Mon 9/8

7:55 pm-10:30 pm

1 stop28h 35m

$149

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Wed 10/1

7:10 am-9:06 am

1 stop23h 56m

Lambert-St Louis

Sun 10/5

7:55 pm-1:17 pm

1 stop19h 22m

$150

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Sun 8/31

6:10 am-12:30 pm

Nonstop4h 20m

Chicago O'Hare Intl

Sat 9/6

6:45 am-9:24 am

Nonstop4h 39m

$190

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 10/8

10:26 am-11:59 pm

1 stop11h 33m

Chicago O'Hare Intl

Wed 10/22

8:20 am-2:01 pm

1 stop7h 41m

$196

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 9/16

12:47 am-6:56 am

Nonstop4h 09m

Chicago O'Hare Intl

Wed 10/1

6:45 am-9:24 am

Nonstop4h 39m

$197

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 10/21

6:30 am-12:35 pm

Nonstop4h 05m

Chicago Midway

Wed 11/5

8:15 am-11:00 am

Nonstop4h 45m

$197

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Mon 10/27

6:00 am-12:05 pm

Nonstop4h 05m

Chicago Midway

Sat 11/15

8:15 am-11:00 am

Nonstop4h 45m

$207

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Mon 9/1

11:10 pm-10:13 am

1 stop9h 03m

Greater Peoria

Wed 9/10

8:10 am-1:35 pm

1 stop7h 25m

$314

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Sat 8/30

11:10 pm-10:13 am

1 stop9h 03m

Greater Peoria

Wed 9/3

8:10 am-1:35 pm

1 stop7h 25m

$374

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 $286, 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 $307.

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 $404. Flights from San Francisco to Illinois on a Sunday will generally be more expensive and average around $510. 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 to Illinois during this time can be as low as $417. Flights at noon are often more expensive with an average ticket price of $477.

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 $365 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 $292 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 22% 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

$71

Fastest flight time

4h 05m

Direct flights

Every day

Airports in Illinois

7 airports
The best one-way flight to Illinois from San Francisco in the past 72 hours is $71. The best round-trip flight deal from San Francisco to Illinois found on momondo in the last 72 hours is $148.
The fastest flight from San Francisco to Illinois takes 4h 05m
Direct flights go from San Francisco to Illinois every day.
There are 7 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Evansville Dress Regional (EVV), Greater Peoria (PIA), Lambert-St Louis (STL), Champaign University-Willard (CMI), Bloomington-Normal (BMI)
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  • 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
2,657 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $118Free CancellationRating
5.8
3,211 reviews
Search Frontier flights
DeltaPriceFrom $128Free CancellationRating
8.0
7,985 reviews
Search Delta flights
United AirlinesPriceFrom $133Free CancellationRating
7.4
8,916 reviews
Search United Airlines flights
Spirit AirlinesPriceFrom $143Free CancellationRating
6.3
8,042 reviews
Search Spirit Airlines flights
Alaska AirlinesPriceFrom $177Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $185Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
American AirlinesPriceFrom $197Free CancellationRating
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 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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