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$58+ 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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
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 January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$146
(Kiwi.com)

One-way from

$58
(Trip.com)

Popular in

December

Cheapest in

July

Average price

$369

Good round-trip deal

$296 or less

Good one-way deal

$166 or less
Provider with most accurate pricing for Chicago (CHI)-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-San Francisco flights.
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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. 17% potential increase in price ($69 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 15, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Sat 2/282:51 pm
STL
-
SFO
1 stop11h 37m
Frontier
Fri 3/69:04 pm
SFO
-
STL
1 stop10h 45m
Frontier
Deal found 1/13$146
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Sat 2/282:51 pm
STL
-
SFO
1 stop11h 37m
Frontier
Thu 3/58:43 am
SFO
-
STL
1 stop10h 43m
Frontier
Deal found 1/13$157
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Wed 2/254:51 pm
STL
-
SFO
1 stop9h 37m
Frontier
Fri 3/69:04 pm
SFO
-
STL
1 stop10h 45m
Frontier
Deal found 1/13$163
This Expedia deal was found by Cheapflights users on 1/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
-
SFO
1 stop17h 12m
Frontier
Sat 2/286:15 am
SFO
-
STL
1 stop5h 41m
Frontier
Deal found 1/13$164
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Fri 2/201:59 pm
STL
-
SFO
1 stop12h 29m
Frontier
Thu 2/268:43 am
SFO
-
STL
1 stop10h 43m
Frontier
Deal found 1/13$169
This Kiwi.com deal was found by Cheapflights users on 1/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/201:59 pm
STL
-
SFO
1 stop12h 29m
Frontier
Sun 2/229:16 pm
SFO
-
STL
1 stop20h 46m
Frontier
Deal found 1/14$171
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Wed 2/254:51 pm
STL
-
SFO
1 stop9h 37m
Frontier
Thu 3/58:43 am
SFO
-
STL
1 stop10h 43m
Frontier
Deal found 1/13$174
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Fri 2/201:59 pm
STL
-
SFO
1 stop12h 29m
Frontier
Wed 2/257:20 am
SFO
-
STL
1 stop6h 33m
Frontier
Deal found 1/13$180
This Frontier deal was found by Cheapflights users on 1/13. 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.
Mon 2/91:40 pm
STL
-
SFO
1 stop12h 48m
Frontier
Wed 2/187:15 pm
SFO
-
STL
1 stop24h 11m
Frontier
Deal found 1/13$182
This Delta deal was found by Cheapflights users on 1/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1012:46 pm
MDW
-
SFO
1 stop9h 39m
Delta
Wed 2/1810:45 pm
SFO
-
MDW
1 stop8h 09m
Delta
Deal found 1/15$243
This Cheapflightsfares deal was found by Cheapflights users on 1/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1112:36 pm
ORD
-
SFO
1 stop11h 03m
Frontier
Fri 2/1310:58 pm
SFO
-
ORD
1 stop9h 48m
Frontier
Deal found 1/13$243
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Sat 2/146:00 am
MDW
-
SFO
2 stops13h 58m
Frontier
Wed 2/1810:58 pm
SFO
-
MDW
1 stop10h 29m
Frontier
Deal found 1/13$244

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 January 15, 2026.
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

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 4/28

3:52 pm-11:48 pm

1 stop9h 56m

San Francisco

Wed 5/13

7:50 am-6:46 pm

1 stop8h 56m

$243

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 2/4

9:00 am-2:02 pm

1 stop7h 02m

San Francisco

Sat 2/7

9:16 am-11:37 pm

1 stop12h 21m

$249

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 2/3

3:44 pm-10:47 pm

1 stop9h 03m

San Francisco

Sat 2/7

11:41 am-11:37 pm

1 stop9h 56m

$249

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 4/14

8:50 am-1:39 pm

1 stop6h 49m

San Francisco

Fri 4/24

10:35 pm-8:34 am

1 stop7h 59m

$252

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 3/24

7:05 pm-11:51 pm

1 stop6h 46m

San Francisco

Mon 3/30

10:40 pm-9:10 am

1 stop8h 30m

$252

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Mon 3/9

3:07 pm-11:59 pm

1 stop10h 52m

San Francisco

Tue 3/17

6:40 am-11:59 pm

1 stop15h 19m

$254

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 2/17

8:15 am-11:15 am

Nonstop5h 00m

San Francisco

Sat 2/21

6:55 am-12:55 pm

Nonstop4h 00m

$255

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Wed 3/18

12:47 pm-7:10 pm

1 stop8h 23m

San Francisco

Wed 3/25

10:40 pm-8:53 am

1 stop8h 13m

$257

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 2/3

1:51 pm-8:59 pm

1 stop9h 08m

San Francisco

Wed 2/4

8:00 am-5:29 pm

1 stop7h 29m

$257

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Wed 2/11

6:00 am-12:55 pm

1 stop8h 55m

San Francisco

Wed 2/11

10:54 pm-8:54 am

1 stop8h 00m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

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, October is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $80). Flying from Illinois to San Francisco in November is currently the most expensive (average of $207). 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 January 15, 2026.

It’s optimal to fly from Illinois to San Francisco in the evening. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Illinois to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Illinois to San Francisco. Price data was last updated on January 10, 2026.

Travelers seeking maximum savings on their Illinois to San Francisco flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 January 15, 2026.

The most flights from USIL to SFO are scheduled on a Thursday (56 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 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?

    Alaska Airlines, Delta, and Southwest can get you from Illinois to San Francisco in just under 5h. Your travel time can differ by up to 4h 56m. Airlines will cover a distance of 1849 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 JetBlue, with whom users have recently found tickets for as low as $73. However, be on the lookout for offers from Frontier and Alaska 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: ANA (89%), China Southern (75%), Brussels Airlines (75%).

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

    While on average a flight from Illinois to San Francisco is generally $1,234, our data shows the cheapest flight currently is $127. When looking at the most popular route, (Chicago O'Hare Intl - San Francisco), you can expect to pay $180 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, October is the cheapest month in which you can book a flight from Illinois to San Francisco (average of $80). Flying from Illinois to San Francisco in November is currently the most expensive (average of $207). 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
South San Francisco
Santa Cruz
Santa Clara
Livermore
Watsonville
San Bruno
Daly City
Sunnyvale
Turlock
San Carlos
San Ramon
Manteca
Vallejo
San Lorenzo
Hollister
Redwood City
Union City
Elk Grove
Foster City

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.
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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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$238FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$325FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$138Average$389FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$183Average$427FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$187Average$275FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$464FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$205Average$411FlexibilityNo cancel feeOn-time69%

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