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$95+ 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
nov. 26 — dic. 31
mar. 11/26
mar. 12/3
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 noviembre 21, 2024.

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 noviembre 21, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 11/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/136:05 amSFO - ORD
1 stop16h 30mFrontier
mar. 12/178:26 pmORD - SFO
1 stop13h 21mFrontier
Deal found 11/20$212
This Expedia deal was found by Cheapflights users on 11/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/89:34 amSFO - ORD
1 stop13h 05mMultiple Airlines
jue. 12/125:59 pmORD - SFO
Nonstop4h 59mMultiple Airlines
Deal found 11/20$213
This Frontier deal was found by Cheapflights users on 11/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/1710:41 amSFO - MDW
1 stop11h 46mFrontier
vie. 1/38:27 pmMDW - SFO
1 stop13h 42mFrontier
Deal found 11/20$214
This United Airlines deal was found by Cheapflights users on 11/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/126:15 amSFO - ORD
Nonstop4h 22mUnited Airlines
mié. 12/186:50 amORD - SFO
Nonstop4h 48mUnited Airlines
Deal found 11/20$217
This United Airlines deal was found by Cheapflights users on 11/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1112:30 amSFO - STL
1 stop7h 17mUnited Airlines
vie. 12/137:00 amSTL - SFO
Nonstop4h 36mUnited Airlines
Deal found 11/20$246
This FlightHub deal was found by Cheapflights users on 11/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/2610:11 pmSFO - STL
1 stop20h 18mFrontier
jue. 1/210:09 pmSTL - SFO
1 stop11h 50mFrontier
Deal found 11/19$248
This American Airlines deal was found by Cheapflights users on 11/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1311:50 pmSFO - ORD
Nonstop4h 14mAmerican Airlines
sáb. 1/49:00 pmORD - SFO
Nonstop4h 59mAmerican Airlines
Deal found 11/20$253
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1112:25 amSFO - MDW
1 stop6h 25mDelta
vie. 12/135:50 pmMDW - SFO
1 stop7h 10mDelta
Deal found 11/20$256
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1112:25 amSFO - ORD
1 stop6h 32mDelta
vie. 12/137:10 pmORD - SFO
1 stop7h 08mDelta
Deal found 11/20$256
This Alaska Airlines deal was found by Cheapflights users on 11/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/1210:40 amSFO - ORD
Nonstop4h 19mAlaska Airlines
vie. 12/135:59 pmORD - SFO
Nonstop4h 59mAlaska Airlines
Deal found 11/20$263
This Travelocity deal was found by Cheapflights users on 11/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/139:00 amSFO - STL
2 stops12h 59mMultiple Airlines
lun. 12/166:46 pmSTL - SFO
1 stop7h 25mMultiple Airlines
Deal found 11/20$270
This American Airlines deal was found by Cheapflights users on 11/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/61:58 pmSFO - STL
1 stop8h 01mAmerican Airlines
dom. 12/85:45 amSTL - SFO
1 stop7h 43mAmerican Airlines
Deal found 11/20$271

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 2,629,791 searches. Data last updated noviembre 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

mar. 3/4

11:12 am-11:39 pm

1 stop10h 27m

Chicago O'Hare Intl

mar. 3/11

7:00 pm-10:10 pm

Nonstop5h 10m

$209

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

vie. 12/13

6:05 am-12:35 am

1 stop16h 30m

Chicago O'Hare Intl

mar. 12/17

8:26 pm-7:47 am

1 stop13h 21m

$212

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

mar. 12/17

10:41 am-12:27 am

1 stop11h 46m

Chicago Midway

vie. 1/3

8:27 pm-8:09 am

1 stop13h 42m

$214

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

jue. 1/23

6:15 am-12:42 pm

Nonstop4h 27m

Chicago O'Hare Intl

sáb. 1/25

6:30 am-9:24 am

Nonstop4h 54m

$217

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

mar. 1/21

5:20 am-11:36 am

Nonstop4h 16m

Chicago O'Hare Intl

jue. 1/30

12:39 pm-3:28 pm

Nonstop4h 49m

$218

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

mié. 1/8

12:10 pm-6:09 pm

Nonstop3h 59m

Lambert-St Louis

mié. 1/15

9:44 am-5:30 pm

1 stop9h 46m

$227

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

vie. 1/24

10:00 am-4:27 pm

Nonstop4h 27m

Chicago O'Hare Intl

vie. 1/24

6:55 pm-9:54 pm

Nonstop4h 59m

$231

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

mié. 2/19

6:05 am-3:40 pm

1 stop7h 35m

Chicago Midway

sáb. 2/22

11:05 am-1:55 pm

Nonstop4h 50m

$237

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

mié. 1/8

9:15 am-7:30 pm

2 stops8h 15m

Lambert-St Louis

mié. 1/15

1:40 pm-8:57 pm

1 stop9h 17m

$241

San FranciscoSt. Louis

SFO - STL

SFOSTL

San Francisco

jue. 12/26

10:11 pm-8:29 pm

1 stop20h 18m

Lambert-St Louis

jue. 1/2

10:09 pm-7:59 am

1 stop11h 50m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/21

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.

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 noviembre 21, 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.

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 noviembre 21, 2024.

The most flights from SFO to USIL are scheduled on a Monday (58 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (29 on average).

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 noviembre 21, 2024.
Get a feel of what it's like to fly with Frontier, United Airlines 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
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

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
5,015 reviews
Southwest
8.1
Very good
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

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
9,458 reviews
Southwest
8.1
Very good
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

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
8,759 reviews
Southwest
8.1
Very good
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

Reviews

1 / 10

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

JetBlue
7.5
Good
3,395 reviews
Southwest
8.1
Very good
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

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
9,173 reviews
Southwest
8.1
Very good
5,015 reviews

Entertainment

7.7

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Boarding

8.2

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 Frontier, which is currently one of the cheapest options available, starting at $95. Southwest flights start at $99 while deals on Alaska Airlines start at $99 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: Asiana Airlines (96%), Iberia (92%), Air China (91%).

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

    Looking at all options, your cheapest flight can be booked for $108. While the most popular route (San Francisco - Chicago O'Hare Intl) can be booked for $173 on average our data indicates $898 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 2,629,791 searches. Data last updated noviembre 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$83Average$226FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$112Average$241FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$115Average$314FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$185Average$467FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$193Average$455FlexibilityNo cancel feeOn-time71%
DeltaCheapest$204Average$319FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$210Average$401FlexibilityNo cancel feeOn-time63%
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