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$109+ 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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Cheap flight deals from San Francisco to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 18, 2024.

Round-trip from

$217
(Alaska Airlines)

One-way from

$109
(Southwest)
From San Francisco to Illinois
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One-way flight from San Francisco to Illinois
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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 December 18, 2024.

This Alaska Airlines deal was found by Cheapflights users on 12/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/315:55 pmSFO - ORD
1 stop9h 35mAlaska Airlines
Mon 1/276:55 pmORD - SFO
Nonstop4h 59mAlaska Airlines
Deal found 12/18$217
This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2511:27 pmSFO - ORD
Nonstop4h 19mAmerican Airlines
Wed 1/86:00 amORD - SFO
1 stop8h 30mAmerican Airlines
Deal found 12/17$237
This CheapOair deal was found by Cheapflights users on 12/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/256:00 amSFO - MDW
1 stop13h 32mFrontier
Wed 1/88:15 amMDW - SFO
1 stop17h 56mFrontier
Deal found 12/18$238
This Frontier deal was found by Cheapflights users on 12/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/308:47 amSFO - STL
1 stop9h 42mFrontier
Mon 1/66:49 pmSTL - SFO
1 stop7h 32mFrontier
Deal found 12/16$238
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/256:45 pmSFO - ORD
Nonstop4h 26mUnited Airlines
Mon 1/62:35 pmORD - SFO
Nonstop4h 55mUnited Airlines
Deal found 12/16$244
This eDestinos deal was found by Cheapflights users on 12/16. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/253:03 pmSFO - ORD
1 stop6h 43mFrontier
Fri 1/36:00 amORD - SFO
1 stop28h 09mFrontier
Deal found 12/16$247
This Delta deal was found by Cheapflights users on 12/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3112:10 amSFO - MDW
1 stop8h 58mDelta
Sun 1/266:59 pmMDW - SFO
1 stop6h 55mDelta
Deal found 12/18$266
This Delta deal was found by Cheapflights users on 12/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2512:10 pmSFO - ORD
1 stop9h 46mDelta
Wed 1/85:00 pmORD - SFO
1 stop9h 14mDelta
Deal found 12/17$266
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/319:29 pmSFO - STL
1 stop13h 58mAlaska Airlines
Tue 1/72:49 pmSTL - SFO
1 stop9h 22mAlaska Airlines
Deal found 12/16$333
This Delta deal was found by Cheapflights users on 12/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1812:36 pmSFO - STL
1 stop7h 50mDelta
Tue 1/75:00 pmSTL - SFO
1 stop9h 14mDelta
Deal found 12/17$342
This FlightHub deal was found by Cheapflights users on 12/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/253:03 pmSFO - ORD
1 stop6h 43mMultiple Airlines
Mon 12/307:30 pmORD - SFO
1 stop17h 16mMultiple Airlines
Deal found 12/17$342
This United Airlines deal was found by Cheapflights users on 12/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1812:00 pmSFO - STL
Nonstop3h 56mUnited Airlines
Wed 12/258:50 amSTL - SFO
Nonstop4h 47mUnited Airlines
Deal found 12/17$383

Find flights from San Francisco to Illinois within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/9

10:00 am-4:27 pm

Nonstop4h 27m

Chicago O'Hare Intl

Mon 1/13

6:55 pm-9:54 pm

Nonstop4h 59m

$217

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Tue 1/14

6:55 am-12:13 am

1 stop15h 18m

Chicago Midway

Thu 1/16

7:15 am-12:09 am

1 stop18h 54m

$218

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/9

10:00 am-4:27 pm

Nonstop4h 27m

Chicago O'Hare Intl

Sun 1/12

7:25 am-12:46 pm

1 stop7h 21m

$218

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/9

9:10 pm-12:35 am

1 stop25h 25m

Chicago O'Hare Intl

Wed 1/15

8:25 pm-11:13 pm

Nonstop4h 48m

$222

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 1/16

3:20 pm-11:59 pm

1 stop6h 39m

Chicago O'Hare Intl

Thu 1/23

2:35 pm-5:30 pm

Nonstop4h 55m

$227

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 1/8

12:27 am-10:38 am

1 stop8h 11m

Chicago O'Hare Intl

Mon 1/13

2:14 pm-8:36 pm

1 stop8h 22m

$236

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Fri 1/17

1:20 pm-10:20 pm

1 stop7h 00m

Lambert-St Louis

Mon 1/20

7:00 am-9:45 am

Nonstop4h 45m

$237

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

Mon 12/30

8:47 am-8:29 pm

1 stop9h 42m

Lambert-St Louis

Mon 1/6

6:49 pm-12:21 am

1 stop7h 32m

$238

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Sat 1/18

2:39 pm-11:44 am

1 stop19h 05m

Chicago Midway

Sat 1/25

7:30 am-9:21 pm

2 stops15h 51m

$244

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Wed 1/29

12:00 pm-10:35 pm

2 stops8h 35m

Chicago O'Hare Intl

Sun 2/2

7:10 pm-11:45 pm

1 stop6h 35m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 54 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.

Travel insights for flights from San Francisco to Illinois

Get recent, data-driven insights about flights from San Francisco to Illinois including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $232). Flying from San Francisco to Illinois in June is currently the most expensive (average of $308). 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 December 18, 2024.

When flying from San Francisco to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 December 18, 2024.
Get a feel of what it's like to fly with Frontier, Sun Country Air and American 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.
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

JetBlue
7.4
Good
3,279 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

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.

  • 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 $109. United Airlines flights start at $109 while deals on Frontier start at $110 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: Iberia (90%), China Southern (89%), Asiana Airlines (87%).

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

    Looking at all options, your cheapest flight can be booked for $124. While the most popular route (San Francisco - Chicago O'Hare Intl) can be booked for $197 on average our data indicates $965 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, September is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $232). Flying from San Francisco to Illinois in June is currently the most expensive (average of $308). 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$82Average$228FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$112Average$241FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$161Average$316FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$185Average$460FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$198Average$455FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$219Average$433FlexibilityNo cancel feeOn-time63%
DeltaCheapest$235Average$332FlexibilityNo cancel feeOn-timeN/A
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