$99+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from San Francisco to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 March 26, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $207 (American Airlines) |
One-way from | $99 (Southwest) |
Popular in | December |
Cheapest in | February |
Average price | $350 |
Good round-trip deal | $303 or less |
Good one-way deal | $148 or less |
Find flight deals from San Francisco to Illinois
Cheapest flights from San Francisco to IllinoisExplore 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 March 26, 2025.
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 March 26, 2025.
This American Airlines deal was found by Cheapflights users on 3/25. 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.
This Agoda.com deal was found by Cheapflights users on 3/25. 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 Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 3/25. 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.
This Southwest deal was found by Cheapflights users on 3/24. 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.
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
This United Airlines deal was found by Cheapflights users on 3/25. 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.
This Expedia deal was found by Cheapflights users on 3/25. 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.
This Sun Country Air deal was found by Cheapflights users on 3/25. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 3/24. 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.
This Delta deal was found by Cheapflights users on 3/24. 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.
This American Airlines deal was found by Cheapflights users on 3/26. 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.
This Frontier deal was found by Cheapflights users on 3/24. 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.
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 March 26, 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
Tue 4/22
11:59 pm-6:17 am
Nonstop4h 18m
Chicago O'Hare Intl
Thu 5/1
8:15 pm-11:09 pm
Nonstop4h 54m
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Sun 5/25
6:55 am-6:10 pm
1 stop9h 15m
Chicago Midway
Tue 6/3
6:45 pm-11:20 pm
1 stop6h 35m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 4/19
11:52 am-6:16 pm
Nonstop4h 24m
Chicago O'Hare Intl
Sat 4/26
7:13 pm-10:12 pm
Nonstop4h 59m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Wed 4/30
12:35 pm-11:05 pm
1 stop8h 30m
Chicago O'Hare Intl
Wed 5/7
6:55 pm-11:20 pm
1 stop6h 25m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Mon 4/28
8:09 pm-6:05 am
1 stop7h 56m
Chicago O'Hare Intl
Sat 5/3
7:13 pm-10:12 pm
Nonstop4h 59m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Thu 4/24
5:15 am-11:36 am
Nonstop4h 21m
Chicago O'Hare Intl
Sun 4/27
5:00 am-9:36 am
1 stop6h 36m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 4/12
8:18 pm-5:01 am
1 stop6h 43m
Chicago O'Hare Intl
Sat 4/19
7:16 pm-10:15 pm
Nonstop4h 59m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Thu 4/24
6:00 pm-1:23 pm
1 stop17h 23m
Chicago O'Hare Intl
Thu 5/1
8:05 pm-5:13 pm
1 stop23h 08m
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Sat 4/19
6:00 am-5:59 pm
1 stop9h 59m
Chicago Midway
Sat 4/26
9:20 am-2:49 pm
1 stop7h 29m
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 4/19
7:10 am-4:22 pm
1 stop7h 12m
Chicago O'Hare Intl
Sat 4/26
1:31 pm-8:15 pm
1 stop8h 44m
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.
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, August is the cheapest month in which you can book a flight from San Francisco to Illinois (average of $245). Flying from San Francisco to Illinois in March is currently the most expensive (average of $323). 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 March 26, 2025.
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 March 26, 2025.
The most flights from SFO to USIL are scheduled on a Tuesday (60 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (14 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 March 26, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta 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.
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
Overall
Boarding
Comfort
Entertainment
Food
Crew
Reviews
Merlyn,Feb 2025
LAX - SMF
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.
Browse thousands of different options on Cheapflights for your next trip
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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.
Top 8 airlines flying from San Francisco to Illinois
Discover the top 8 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 March 26, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$66 | Average$229 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$113 | Average$239 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$115 | Average$313 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$178 | Average$337 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$185 | Average$456 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$206 | Average$461 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$208 | Average$403 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$236 | Average$338 | FlexibilityNo cancel fee | On-timeN/A |