$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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
feb. 25 — mar. 41
1 adult, Economy
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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 Illinois to San Francisco
Keep the following information in mind while searching for Illinois to San Francisco flight deals. Data was last updated febrero 20, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $204 (Trip.com) |
One-way from | $99 (Southwest) |
Popular in | March |
Cheapest in | April |
Average price | $297 |
Good round-trip deal | $286 or less |
Good one-way deal | $98 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 febrero 20, 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 febrero 20, 2025.
This Trip.com deal was found by Cheapflights users on 2/20. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 3/148:44 pmMDW - SFO
1 stop17h 44mFrontier
lun. 3/178:09 pmSFO - MDW
1 stop7h 22mFrontier
Deal found 2/20![Frontier logo]()
$204
This Expedia deal was found by Cheapflights users on 2/20. 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.
jue. 3/137:00 pmORD - SFO
Nonstop5h 10mMultiple Airlines
dom. 3/1612:15 amSFO - ORD
1 stop12h 01mMultiple Airlines
Deal found 2/20![Multiple Airlines logo]()
$204
This Southwest deal was found by Cheapflights users on 2/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/1212:35 pmMDW - SFO
Nonstop4h 45mSouthwest
mar. 3/187:55 pmSFO - MDW
1 stop7h 20mSouthwest
Deal found 2/18![Southwest logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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.
mar. 4/156:56 pmORD - SFO
Nonstop4h 59mAlaska Airlines
mar. 4/296:49 pmSFO - ORD
1 stop9h 16mAlaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$207
This United Airlines deal was found by Cheapflights users on 2/20. 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.
sáb. 4/55:00 amORD - SFO
1 stop6h 36mUnited Airlines
vie. 4/1112:08 amSFO - ORD
Nonstop4h 22mUnited Airlines
Deal found 2/20![United Airlines logo]()
$208
This Frontier deal was found by Cheapflights users on 2/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/74:26 pmORD - SFO
1 stop7h 23mFrontier
mar. 4/1510:30 pmSFO - ORD
1 stop10h 10mFrontier
Deal found 2/19![Frontier logo]()
$210
This American Airlines deal was found by Cheapflights users on 2/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/88:15 pmORD - SFO
Nonstop4h 54mAmerican Airlines
mar. 4/2212:47 amSFO - ORD
1 stop6h 40mAmerican Airlines
Deal found 2/19![American Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 2/20. 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. 4/237:50 amORD - SFO
1 stop9h 56mDelta
sáb. 4/266:15 amSFO - ORD
1 stop6h 50mDelta
Deal found 2/20![Delta logo]()
$220
This Mytrip deal was found by Cheapflights users on 2/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/66:35 amSTL - SFO
1 stop12h 40mMultiple Airlines
dom. 4/136:00 amSFO - STL
1 stop25h 06mMultiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$239
This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/66:45 pmSTL - SFO
1 stop29h 14mFrontier
dom. 3/98:10 pmSFO - STL
1 stop11h 06mFrontier
Deal found 2/19![Frontier logo]()
$240
This Delta deal was found by Cheapflights users on 2/20. 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.
sáb. 4/51:12 pmMDW - SFO
1 stop8h 51mDelta
vie. 4/1112:30 amSFO - MDW
1 stop8h 12mDelta
Deal found 2/20![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 4/410:58 amPIA - SFO
1 stop8h 38mUnited Airlines
mar. 4/811:12 amSFO - PIA
1 stop7h 39mUnited Airlines
Deal found 2/19![United Airlines logo]()
$289
Find flights from Illinois to San Francisco within your budget
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 febrero 20, 2025.
Fly from
Illinois
Fly to
San Francisco
Route
Depart
Return
Price
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
vie. 3/14
8:44 pm-12:28 pm
1 stop17h 44m
San Francisco
lun. 3/17
8:09 pm-5:31 am
1 stop7h 22m
$204
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
jue. 3/13
7:00 pm-10:10 pm
Nonstop5h 10m
San Francisco
dom. 3/16
12:15 am-2:16 pm
1 stop12h 01m
$204
ChicagoSan Francisco
MDW - SFO
MDWSFO
Chicago Midway
mié. 3/12
12:35 pm-3:20 pm
Nonstop4h 45m
San Francisco
mar. 3/18
7:55 pm-5:15 am
1 stop7h 20m
$207
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
mar. 4/15
6:56 pm-9:55 pm
Nonstop4h 59m
San Francisco
mar. 4/29
6:49 pm-6:05 am
1 stop9h 16m
$207
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
sáb. 4/5
5:00 am-9:36 am
1 stop6h 36m
San Francisco
sáb. 4/12
5:05 pm-11:27 pm
Nonstop4h 22m
$208
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
lun. 4/7
4:26 pm-9:49 pm
1 stop7h 23m
San Francisco
sáb. 4/12
8:18 pm-5:01 am
1 stop6h 43m
$210
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
mar. 4/8
10:34 am-1:23 pm
Nonstop4h 49m
San Francisco
lun. 4/14
12:47 am-9:27 am
1 stop6h 40m
$217
ChicagoSan Francisco
ORD - SFO
ORDSFO
Chicago O'Hare Intl
mié. 4/23
7:50 am-3:46 pm
1 stop9h 56m
San Francisco
sáb. 4/26
6:15 am-3:05 pm
1 stop6h 50m
$220
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
dom. 4/6
6:35 am-5:15 pm
1 stop12h 40m
San Francisco
dom. 4/13
6:00 am-9:06 am
1 stop25h 06m
$239
St. LouisSan Francisco
STL - SFO
STLSFO
Lambert-St Louis
jue. 3/6
6:45 pm-9:59 pm
1 stop29h 14m
San Francisco
dom. 3/9
8:10 pm-9:16 am
1 stop11h 06m
$240
Showing 1-10 of 54 results
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.
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 Illinois to San Francisco
Get recent, data-driven insights about flights from Illinois to San Francisco including ideal travel times, pricing trends, and more.
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 $403). 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 febrero 20, 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 febrero 20, 2025.
The most flights from USIL to SFO are scheduled on a Monday (63 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 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 febrero 20, 2025.
See what other customers who have flown with Southwest, Alaska Airlines and Delta 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.
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
Entertainment
7.6
Boarding
8.2
Food
7.1
Comfort
8.1
Overall
8.1
Crew
8.7
Reviews
1 / 20
2.0
MediocreBhoopal,Nov 2024
STL - BOS
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 locationsRoseville
Mountain View
Turlock
Santa Cruz
Fairfield
Manteca
Sausalito
Watsonville
Hayward
Richmond
Hollister
South San Francisco
Antioch
Milpitas
Vallejo
Newark
Alameda
Campbell
Pacific Grove
Sunnyvale
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to San Francisco
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Illinois to San Francisco
Discover the top 6 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 febrero 20, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$88 | Average$219 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$413 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$141 | Average$443 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$162 | Average$299 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$198 | Average$452 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$247 | Average$420 | FlexibilityNo cancel fee | On-time63% |