$103+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
Jul 7 — Jul 141
1 adult, Economy
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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
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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 July 2, 2025.
Round-trip from | $207 (Southwest) |
|---|---|
One-way from | $103 (Frontier) |
Popular in | December |
Cheapest in | February |
Average price | $343 |
Good round-trip deal | $294 or less |
Good one-way deal | $150 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 July 2, 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 July 2, 2025.
This Southwest deal was found by Cheapflights users on 6/30. 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.
Tue 8/127:50 amSFO - MDW
1 stop8h 40mSouthwest
Tue 8/193:50 pmMDW - SFO
Nonstop4h 35mSouthwest
Deal found 6/30![Southwest logo]()
$207
This American Airlines deal was found by Cheapflights users on 6/30. 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.
Tue 9/161:21 pmSFO - ORD
Nonstop4h 24mAmerican Airlines
Thu 9/186:45 amORD - SFO
Nonstop4h 39mAmerican Airlines
Deal found 6/30![American Airlines logo]()
$207
This Mytrip deal was found by Cheapflights users on 7/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/98:36 pmSFO - MDW
1 stop21h 05mFrontier
Sat 8/162:44 pmMDW - SFO
1 stop10h 41mFrontier
Deal found 7/2![Frontier logo]()
$208
This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1610:29 pmSFO - ORD
1 stop9h 56mFrontier
Sat 8/237:00 amORD - SFO
1 stop17h 33mFrontier
Deal found 7/2![Frontier logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 9/611:00 pmSFO - ORD
1 stop9h 28mMultiple Airlines
Tue 9/93:20 pmORD - SFO
1 stop8h 00mMultiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$212
This Southwest deal was found by Cheapflights users on 6/30. 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.
Sat 8/236:50 amSFO - ORD
2 stops13h 10mSouthwest
Sun 8/317:30 amORD - SFO
1 stop6h 25mSouthwest
Deal found 6/30![Southwest logo]()
$213
This United Airlines deal was found by Cheapflights users on 6/29. 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.
Fri 9/54:55 pmSFO - ORD
Nonstop4h 17mUnited Airlines
Sun 9/76:15 amORD - SFO
Nonstop4h 41mUnited Airlines
Deal found 6/29![United Airlines logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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 10/142:44 pmSFO - ORD
1 stop7h 15mAlaska Airlines
Wed 10/228:20 amORD - SFO
1 stop7h 41mAlaska Airlines
Deal found 6/30![Alaska Airlines logo]()
$226
This Hawaiian Airlines deal was found by Cheapflights users on 6/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/53:05 pmSFO - ORD
1 stop6h 34mHawaiian Airlines
Tue 8/127:18 pmORD - SFO
Nonstop4h 48mHawaiian Airlines
Deal found 6/30![Hawaiian Airlines logo]()
$227
This Delta deal was found by Cheapflights users on 7/2. 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.
Mon 8/1812:40 amSFO - MDW
1 stop6h 11mDelta
Sun 8/247:17 pmMDW - SFO
1 stop6h 40mDelta
Deal found 7/2![Delta logo]()
$257
This Frontier deal was found by Cheapflights users on 6/30. 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.
Fri 8/2210:11 pmSFO - STL
2 stops9h 00mFrontier
Sun 8/247:54 pmSTL - SFO
1 stop6h 25mFrontier
Deal found 6/30![Frontier logo]()
$284
This Travelocity deal was found by Cheapflights users on 7/2. 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.
Thu 9/187:07 pmSFO - STL
1 stop11h 59mMultiple Airlines
Sun 9/217:34 amSTL - SFO
1 stop11h 32mMultiple Airlines
Deal found 7/2![Multiple Airlines logo]()
$287
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 July 2, 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 - MDW
SFOMDW
San Francisco
Tue 8/12
9:05 pm-7:40 am
1 stop8h 35m
Chicago Midway
Sat 8/16
8:10 am-10:45 am
Nonstop4h 35m
$207
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Tue 9/16
12:47 am-6:56 am
Nonstop4h 09m
Chicago O'Hare Intl
Mon 9/22
8:31 am-11:15 am
Nonstop4h 44m
$207
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Sat 8/9
8:36 pm-7:41 pm
1 stop21h 05m
Chicago Midway
Sat 8/16
2:44 pm-11:25 pm
1 stop10h 41m
$208
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 8/16
10:29 pm-10:25 am
1 stop9h 56m
Chicago O'Hare Intl
Sat 8/23
7:00 am-10:33 pm
1 stop17h 33m
$208
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 9/6
11:00 pm-10:28 am
1 stop9h 28m
Chicago O'Hare Intl
Tue 9/9
3:20 pm-9:20 pm
1 stop8h 00m
$212
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Sat 8/23
6:50 am-4:45 pm
2 stops7h 55m
Chicago O'Hare Intl
Sun 8/31
7:30 am-11:55 am
1 stop6h 25m
$213
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Fri 9/5
4:55 pm-11:12 pm
Nonstop4h 17m
Chicago O'Hare Intl
Sun 9/7
6:15 am-8:56 am
Nonstop4h 41m
$217
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Tue 8/5
7:49 pm-5:40 am
1 stop7h 51m
Chicago O'Hare Intl
Thu 8/14
7:18 pm-10:06 pm
Nonstop4h 48m
$227
San FranciscoChicago
SFO - ORD
SFOORD
San Francisco
Fri 9/26
9:19 pm-7:03 am
1 stop7h 44m
Chicago O'Hare Intl
Sat 9/27
10:00 am-6:09 pm
1 stop10h 09m
$231
San FranciscoChicago
SFO - MDW
SFOMDW
San Francisco
Mon 8/18
12:40 am-8:51 am
1 stop6h 11m
Chicago Midway
Sat 8/23
9:31 am-2:27 pm
1 stop6h 56m
$257
Showing 1-10 of 53 results
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, 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 $321). 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 July 2, 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 July 2, 2025.
The most flights from SFO to USIL are scheduled on a Tuesday (92 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (24 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 July 2, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, 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.
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Entertainment
7.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
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 July 2, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$60 | Average$214 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$284 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$128 | Average$321 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$133 | Average$436 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$143 | Average$226 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$172 | Average$306 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$197 | Average$453 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$198 | Average$353 | FlexibilityNo cancel fee | On-time63% |