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$64+ Cheap flights from San Francisco (SFO) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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Find flight deals from San Francisco to Illinois

Cheapest flights from San Francisco to Illinois
Explore the most affordable flight options available from San Francisco to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:18 amSFO - STL
1 stop25h 56mFrontier
Tue 12/93:30 pmSTL - SFO
2 stops33h 37mFrontier
Deal found 10/18$244
This Kiwi.com deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/168:55 pmSFO - STL
1 stop12h 29mFrontier
Fri 11/213:53 pmSTL - SFO
1 stop17h 18mFrontier
Deal found 10/17$248
This Kiwi.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:43 pmSFO - STL
1 stop18h 24mFrontier
Sun 11/167:02 pmSTL - SFO
2 stops23h 41mFrontier
Deal found 10/18$250
This Priceline deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:41 amSFO - STL
1 stop10h 17mFrontier
Thu 11/277:57 pmSTL - SFO
1 stop6h 27mFrontier
Deal found 10/18$252
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:30 amSFO - ORD
2 stops12h 12mFrontier
Sun 12/146:11 amORD - SFO
1 stop9h 07mFrontier
Deal found 10/19$252
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:10 amSFO - MDW
Nonstop4h 05mSouthwest
Sat 12/61:15 pmMDW - SFO
1 stop8h 50mSouthwest
Deal found 10/20$253
This Kiwi.com deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2610:25 pmSFO - STL
2 stops32h 42mFrontier
Wed 10/298:40 pmSTL - SFO
1 stop14h 53mFrontier
Deal found 10/20$253
This Booking.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:00 amSFO - ORD
1 stop15h 12mFrontier
Wed 10/297:20 amORD - SFO
1 stop17h 07mFrontier
Deal found 10/18$253
This Kiwi.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:30 amSFO - MDW
1 stop26h 38mFrontier
Mon 12/1512:18 pmMDW - SFO
2 stops11h 45mFrontier
Deal found 10/18$254
This Kiwi.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2710:47 pmSFO - ORD
1 stop10h 27mFrontier
Fri 10/316:00 amORD - SFO
2 stops10h 04mFrontier
Deal found 10/18$254
This Kiwi.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:30 amSFO - MDW
2 stops23h 42mFrontier
Thu 11/139:00 amMDW - SFO
1 stop9h 43mFrontier
Deal found 10/18$255
This Booking.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2510:23 pmSFO - STL
1 stop10h 14mFrontier
Mon 10/277:52 pmSTL - SFO
1 stop28h 35mFrontier
Deal found 10/19$255

Cheap flight deals from San Francisco to Illinois

Keep the following information in mind while searching for San Francisco to Illinois flight deals. Data was last updated October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$244
(Kiwi.com)

One-way from

$64
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$389

Good round-trip deal

$378 or less

Good one-way deal

$194 or less
Provider with most accurate pricing for San Francisco-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Chicago (CHI) flights.
Search Deals
From San Francisco to Illinois
Search Deals
One-way flight from San Francisco to Illinois
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from San Francisco to Illinois.
Search Deals
Price to beat on a one-way flight from San Francisco to Illinois.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated October 20, 2025.
Use the filters below to find and compare flights from San Francisco to Illinois that are best for you.

Fly from

San Francisco

Fly to

Illinois

Route

Depart

Return

Price

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 11/11

7:00 am-11:59 pm

1 stop14h 59m

Chicago O'Hare Intl

Thu 11/20

6:00 am-10:41 pm

1 stop18h 41m

$262

San FranciscoChicago

SFO - RFD

SFORFD

San Francisco

Wed 11/5

7:30 am-11:53 am

1 stop26h 23m

Chicago Greater Rockford

Fri 11/7

6:40 pm-4:43 pm

1 stop24h 03m

$266

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 3/10

12:30 pm-11:10 pm

1 stop8h 40m

Chicago O'Hare Intl

Wed 3/11

2:59 pm-8:04 pm

1 stop7h 05m

$271

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Tue 12/2

5:45 am-7:10 pm

2 stops11h 25m

Lambert-St Louis

Tue 12/9

6:00 am-3:57 pm

2 stops11h 57m

$284

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Fri 1/16

11:56 pm-10:10 am

1 stop8h 14m

Greater Peoria

Mon 1/26

3:00 pm-9:30 pm

1 stop8h 30m

$289

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Fri 1/16

11:56 pm-10:10 am

1 stop8h 14m

Greater Peoria

Sat 1/17

3:00 pm-9:30 pm

1 stop8h 30m

$289

San FranciscoPeoria

SFO - PIA

SFOPIA

San Francisco

Thu 1/15

4:59 pm-8:39 pm

1 stop25h 40m

Greater Peoria

Sun 1/25

7:51 pm-2:43 pm

2 stops20h 52m

$293

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Sun 12/14

5:50 am-7:10 pm

2 stops11h 20m

Lambert-St Louis

Tue 12/16

6:00 am-3:57 pm

2 stops11h 57m

$295

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 11/11

6:10 am-12:15 pm

Nonstop4h 05m

Chicago Midway

Sat 11/15

8:15 am-11:00 am

Nonstop4h 45m

$301

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Thu 11/27

6:00 am-3:05 pm

1 stop7h 05m

Lambert-St Louis

Thu 12/4

2:20 pm-10:31 pm

2 stops10h 11m

$306

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 60 results
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Best time to book a flight from San Francisco to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from San Francisco with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to Illinois

What is the cheapest month to book a flight from San Francisco to Illinois?

Currently, December is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $110). Flying from San Francisco to Illinois in March is currently the most expensive (average of $194). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SFO to IL?

Find hourly flight availability from San Francisco to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 20, 2025.

It’s optimal to fly from San Francisco to Illinois in the evening. By choosing this option you can save up to 28% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from San Francisco to Illinois?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Francisco to Illinois flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from San Francisco to Illinois

Explore weekly flight availability from San Francisco to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated October 20, 2025.

The most flights from SFO to USIL are scheduled on a Monday (86 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (67 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated October 20, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United Airlines from San Francisco to Illinois by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,134 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,993 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,026 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,130 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from San Francisco to Illinois?

    Most people fly from San Francisco (SFO) if they book a flight from San Francisco to Illinois. San Francisco is conveniently located just 11.8 mi from San Francisco’s city center.

  • How long is the flight from San Francisco to Illinois?

    For as low as $289, Alaska Airlines can have you in Illinois from San Francisco in 8h 14m. Airlines will cover a distance of 1753 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from San Francisco to Illinois one-way?

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $117. Alaska Airlines flights start at $126 while deals on Delta start at $127 one-way.

  • What are the most popular routes from San Francisco to Illinois?

    The most popular route from San Francisco to Illinois is San Francisco - Chicago O'Hare Intl. You may also consider San Francisco - Chicago Midway or San Francisco - Lambert-St Louis.

  • What are the most reliable airlines from San Francisco to Illinois?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Illinois on time: China Southern (100%), ITA Airways (90%), Asiana Airlines (90%).

  • What are the cheapest flights from San Francisco to Illinois?

    Looking at all options, your cheapest flight can be booked for $125. While the most popular route (San Francisco - Chicago O'Hare Intl) can be booked for $155 on average, our data indicates $981 when flying from San Francisco to Illinois.

  • Can I find deals for flights from San Francisco to Illinois that include hotel bookings?

    Yes. In addition to deals on San Francisco to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Illinois.

  • Can I find deals for business class flights from San Francisco to Illinois?

    Yes. Cheapflights offers flight deals from San Francisco to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Francisco to Illinois?

    Currently, December is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $110). Flying from San Francisco to Illinois in March is currently the most expensive (average of $194). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for San Francisco to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from San Francisco to Illinois

Discover the top 7 airlines that operate flights from San Francisco to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$108Average$288FlexibilityNo cancel feeOn-time85%
FrontierCheapest$128Average$241FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$313FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$133Average$455FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$185Average$336FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$196Average$342FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$468FlexibilityNo cancel feeOn-time71%

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