$99+ Cheap flights from Illinois to San Francisco (SFO)
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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Illinois to San Francisco 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 Illinois to San Francisco
Keep the following information in mind while searching for Illinois to San Francisco flight deals. Data was last updated May 1, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $206 (Cheapflightsfares) |
One-way from | $99 (Southwest) |
Popular in | December |
Cheapest in | September |
Average price | $297 |
Good round-trip deal | $218 or less |
Good one-way deal | $108 or less |
Find flight deals from Illinois to San Francisco
Cheapest flights from Illinois to San FranciscoExplore the most affordable flight options available from Illinois to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.
Explore the most affordable flight options available from Illinois to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.
This Southwest deal was found by Cheapflights users on 4/29. 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 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 4/30. 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.
This Frontier deal was found by Cheapflights users on 4/30. 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.
This Orbitz deal was found by Cheapflights users on 4/30. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Cheapflightsfares deal was found by Cheapflights users on 4/30. 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 Cheapflightsfares 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 4/30. 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.
This United Airlines deal was found by Cheapflights users on 4/29. 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.
This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair 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 4/30. 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.
This Delta deal was found by Cheapflights users on 4/30. 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 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 4/30. 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 Delta 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 Illinois to San Francisco 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 May 1, 2025.
Use the filters below to find and compare flights from Illinois to San Francisco that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 6/24
5:15 am-9:25 am
1 stop6h 10m
San Francisco
Tue 7/1
7:45 pm-5:00 am
1 stop7h 15m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Wed 6/4
7:59 pm-10:49 pm
Nonstop4h 50m
San Francisco
Tue 6/10
12:33 pm-6:59 pm
Nonstop4h 26m
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
Tue 5/20
10:34 am-10:33 pm
1 stop13h 59m
San Francisco
Sun 5/25
5:45 am-3:00 pm
1 stop7h 15m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Fri 5/30
7:59 pm-10:49 pm
Nonstop4h 50m
San Francisco
Fri 6/6
5:45 am-8:56 pm
1 stop13h 11m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Sat 5/17
4:15 pm-1:15 pm
1 stop23h 00m
San Francisco
Tue 5/27
8:45 pm-12:20 am
1 stop25h 35m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Sun 5/11
6:30 am-9:20 am
Nonstop4h 50m
San Francisco
Mon 5/12
12:10 am-6:30 am
Nonstop4h 20m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Wed 6/4
6:55 pm-11:20 pm
1 stop6h 25m
San Francisco
Sat 6/7
6:25 am-5:55 pm
1 stop9h 30m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Thu 6/5
7:59 pm-10:49 pm
Nonstop4h 50m
San Francisco
Tue 6/10
2:39 pm-11:59 pm
1 stop7h 20m
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
Sat 5/24
5:35 pm-10:28 am
1 stop18h 53m
San Francisco
Sat 5/31
6:39 pm-1:42 pm
1 stop17h 03m
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
Thu 6/5
6:45 am-9:18 am
Nonstop4h 33m
San Francisco
Mon 6/9
11:55 pm-6:10 am
Nonstop4h 15m
Best time to book a flight from Illinois to San Francisco
Have a flexible travel schedule? Discover the best time to fly to San Francisco from Illinois with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Illinois to San Francisco
What is the cheapest month to book a flight from Illinois to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $276). Flying from Illinois to San Francisco in June is currently the most expensive (average of $384). 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 IL to SFO?
Find hourly flight availability from Illinois to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 1, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to San Francisco as you normally would.
Weekly flight availability from Illinois to San Francisco
Explore weekly flight availability from Illinois to San Francisco. 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 May 1, 2025.
The most flights from USIL to SFO are scheduled on a Wednesday (75 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).
Rainfall in San Francisco by month
Plan your trip to San Francisco by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.
Temperature in San Francisco by month
Plan your trip to San Francisco by taking into account the average temperature totals by month.
If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).
Reviews of airlines servicing San Francisco
Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated May 1, 2025.
See what other customers who have flown with Breeze Airways, Alaska Airlines and Southwest from Illinois to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Boarding
Comfort
Food
Entertainment
Crew
Overall
Reviews
Dena,Dec 2024
LAS - BDL
Related info for your journey
Find useful and relevant information for your journey from Illinois to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Illinois?
Book flights to Illinois if you plan to visit one of these locationsBrowse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Illinois to San Francisco
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Illinois to San Francisco
Discover the top 7 airlines that operate flights from Illinois to San Francisco. 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 May 1, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$78 | Average$229 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$268 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$141 | Average$441 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$155 | Average$286 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$197 | Average$446 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$219 | Average$389 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$262 | Average$441 | FlexibilityNo cancel fee | On-time63% |