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$82+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
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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 septiembre 15, 2025.

Round-trip from

$175
(Kiwi.com)

One-way from

$82
(United Airlines)

Popular in

December

Cheapest in

July

Average price

$297

Good round-trip deal

$298 or less

Good one-way deal

$159 or less
From Illinois to San Francisco
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One-way flight from Illinois to San Francisco
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Highest demand for flights based on searches. 8% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to San Francisco.
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Price to beat on a one-way flight from Illinois to San Francisco.
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Find flight deals from Illinois to San Francisco

Cheapest flights from Illinois to San Francisco
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 septiembre 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
jue. 10/2310:17 amSTL - SFO
1 stop7h 43mFrontier
mié. 11/56:34 amSFO - STL
1 stop24h 33mFrontier
Deal found 9/15$175
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
mié. 10/227:52 pmSTL - SFO
1 stop20h 32mFrontier
dom. 11/28:09 pmSFO - STL
1 stop10h 58mFrontier
Deal found 9/15$182
This Southwest deal was found by Cheapflights users on 9/15. 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.
mar. 10/75:55 amSTL - SFO
1 stop5h 45mSouthwest
mié. 10/85:30 amSFO - STL
1 stop5h 50mSouthwest
Deal found 9/15$183
This Frontier deal was found by Cheapflights users on 9/13. 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.
jue. 10/27:55 pmSTL - SFO
1 stop6h 21mFrontier
sáb. 10/411:00 pmSFO - STL
1 stop14h 04mFrontier
Deal found 9/13$184
This Frontier deal was found by Cheapflights users on 9/15. 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.
mié. 10/227:52 pmSTL - SFO
2 stops14h 52mFrontier
vie. 11/78:09 pmSFO - STL
1 stop10h 58mFrontier
Deal found 9/15$189
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/257:55 pmSTL - SFO
1 stop14h 20mFrontier
mar. 9/307:10 amSFO - STL
1 stop23h 56mFrontier
Deal found 9/15$190
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
jue. 10/27:55 pmSTL - SFO
1 stop6h 21mFrontier
mié. 10/86:34 amSFO - STL
1 stop24h 33mFrontier
Deal found 9/13$191
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/207:55 pmSTL - SFO
1 stop14h 20mFrontier
mar. 9/237:10 amSFO - STL
1 stop23h 56mFrontier
Deal found 9/14$192
This Frontier deal was found by Cheapflights users on 9/14. 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.
sáb. 10/254:51 pmSTL - SFO
1 stop6h 38mFrontier
lun. 10/2710:17 pmSFO - STL
2 stops8h 50mFrontier
Deal found 9/14$193
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/229:29 pmSTL - SFO
1 stop25h 52mFrontier
jue. 9/2510:37 pmSFO - STL
1 stop20h 03mFrontier
Deal found 9/15$194
This Southwest deal was found by Cheapflights users on 9/14. 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.
vie. 12/1211:50 amSTL - SFO
Nonstop4h 30mSouthwest
dom. 12/1412:50 pmSFO - STL
Nonstop3h 40mSouthwest
Deal found 9/14$195
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
mar. 10/218:20 amORD - SFO
1 stop7h 41mMultiple Airlines
dom. 10/268:21 pmSFO - ORD
1 stop11h 15mMultiple Airlines
Deal found 9/15$208

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 septiembre 15, 2025.
Use the filters below to find and compare flights from Illinois to San Francisco that are best for you.

Fly from

Illinois

Fly to

San Francisco

Route

Depart

Return

Price

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

sáb. 10/18

1:45 pm-9:30 pm

2 stops9h 45m

San Francisco

mié. 10/22

3:50 pm-12:30 am

1 stop6h 40m

$188

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

sáb. 10/4

7:55 pm-8:15 am

1 stop14h 20m

San Francisco

lun. 10/13

6:15 pm-9:07 am

2 stops36h 52m

$209

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

mar. 2/24

2:55 pm-10:18 pm

1 stop9h 23m

San Francisco

mié. 2/25

2:40 pm-11:56 pm

1 stop7h 16m

$214

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

mié. 2/25

6:00 pm-11:17 pm

1 stop7h 17m

San Francisco

lun. 3/2

11:59 pm-9:23 am

1 stop7h 24m

$215

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

mié. 2/25

6:00 am-12:11 pm

1 stop8h 11m

San Francisco

mié. 2/25

12:43 am-9:23 am

1 stop6h 40m

$215

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

mié. 10/8

6:05 pm-11:33 pm

1 stop7h 28m

San Francisco

sáb. 10/11

12:35 am-8:30 am

1 stop5h 55m

$241

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

vie. 12/12

9:15 am-9:46 pm

1 stop14h 31m

San Francisco

lun. 12/15

9:57 pm-2:09 pm

1 stop14h 12m

$241

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

lun. 10/27

5:29 pm-8:07 pm

Nonstop4h 38m

San Francisco

mié. 10/29

10:35 am-4:27 pm

Nonstop3h 52m

$253

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

mar. 11/25

5:29 pm-8:07 pm

Nonstop4h 38m

San Francisco

mié. 12/3

10:35 am-4:27 pm

Nonstop3h 52m

$253

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

lun. 10/27

5:29 pm-8:07 pm

Nonstop4h 38m

San Francisco

mar. 11/4

10:35 am-4:27 pm

Nonstop3h 52m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 60 results
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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.

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 $357). 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 septiembre 15, 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 septiembre 15, 2025.

The most flights from USIL to SFO are scheduled on a Sunday (88 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (55 on average).

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.

  • What airport do you fly into for flights to San Francisco from Illinois?

    If you book a flight to San Francisco from Illinois, you will be flying to San Francisco, which is the city’s only airport. San Francisco (SFO) is located 11.8 mi from the center of San Francisco.

  • How long is the flight from Illinois to San Francisco?

    Southwest, Frontier, and Alaska Airlines can get you from Illinois to San Francisco in just under 9h 23m. Your travel time can differ by up to 4h 57m. Airlines will cover a distance of 1730 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Illinois to San Francisco one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from Southwest and Hawaiian Airlines, as they are both options that can get you from Illinois to San Francisco for a low price.

  • What are the most popular routes from Illinois to San Francisco?

    The most popular route from Illinois to San Francisco is Chicago O'Hare Intl - San Francisco. You may also consider Chicago Midway - San Francisco or Lambert-St Louis - San Francisco.

  • What are the most reliable airlines from Illinois to San Francisco?

    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 Illinois to San Francisco on time: Air China (79%), ANA (79%), Austrian Airlines (75%).

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

    While on average a flight from Illinois to San Francisco is generally $924, our data shows the cheapest flight currently is $89. When looking at the most popular route, (Chicago O'Hare Intl - San Francisco), you can expect to pay $153 for that flight.

  • Can I find deals for flights from Illinois to San Francisco that include hotel bookings?

    Yes. In addition to deals on Illinois to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to San Francisco.

  • Can I find deals for business class flights from Illinois to San Francisco?

    Yes. Cheapflights offers flight deals from Illinois to San Francisco 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 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 $357). 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Santa Clara
Manteca
Sunnyvale
Hollister
Vacaville
Foster City
Union City
Vallejo
Burlingame
Redwood City
San Mateo
San Leandro
Lathrop

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Alternative routes for Illinois to San Francisco

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Top 8 airlines flying from Illinois to San Francisco

Discover the top 8 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 septiembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$335FlexibilityNo cancel feeOn-time83%
FrontierCheapest$123Average$272FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$320FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$180Average$379FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$188Average$286FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$441FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$204Average$401FlexibilityNo cancel feeOn-time69%

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