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$85+ 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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Dec 29 — Jan 51
Mon 12/29
Mon 1/5
1 adult, Economy
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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 November 29, 2025.

This Frontier deal was found by Cheapflights users on 11/28. 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.
Sat 12/2010:10 pmSTL - SFO
1 stop11h 38mFrontier
Thu 1/810:18 pmSFO - STL
1 stop11h 54mFrontier
Deal found 11/28$183
This Frontier deal was found by Cheapflights users on 11/28. 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.
Sat 12/2010:10 pmSTL - SFO
1 stop11h 38mFrontier
Wed 12/316:00 amSFO - STL
1 stop8h 24mFrontier
Deal found 11/28$184
This Kiwi.com deal was found by Cheapflights users on 11/28. 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.
Sun 12/79:14 pmSTL - SFO
1 stop12h 34mFrontier
Tue 12/166:00 amSFO - STL
2 stops26h 14mFrontier
Deal found 11/28$185
This Kiwi.com deal was found by Cheapflights users on 11/28. 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.
Sun 12/79:14 pmSTL - SFO
1 stop12h 34mFrontier
Fri 12/126:30 amSFO - STL
1 stop25h 44mFrontier
Deal found 11/28$187
This Kiwi.com deal was found by Cheapflights users on 11/28. 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.
Sun 12/79:14 pmSTL - SFO
1 stop12h 34mFrontier
Sat 12/136:00 amSFO - STL
1 stop28h 12mFrontier
Deal found 11/28$200
This Booking.com deal was found by Cheapflights users on 11/28. 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.
Wed 12/107:43 pmSTL - SFO
1 stop14h 10mFrontier
Tue 12/166:30 amSFO - STL
1 stop25h 44mFrontier
Deal found 11/28$202
This Expedia deal was found by Cheapflights users on 11/27. 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.
Thu 12/256:12 amMDW - SFO
1 stop9h 01mFrontier
Tue 12/306:24 amSFO - MDW
1 stop11h 31mFrontier
Deal found 11/27$253
This Cheapflightsfares deal was found by Cheapflights users on 11/28. 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.
Sat 12/61:24 pmORD - SFO
1 stop10h 26mFrontier
Mon 12/811:38 pmSFO - ORD
1 stop13h 34mFrontier
Deal found 11/28$253
This Frontier deal was found by Cheapflights users on 11/27. 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 12/156:11 amORD - SFO
1 stop9h 17mFrontier
Mon 12/1511:33 pmSFO - ORD
1 stop13h 39mFrontier
Deal found 11/27$254
This Kiwi.com deal was found by Cheapflights users on 11/27. 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 12/103:05 pmORD - SFO
1 stop9h 43mHawaiian Airlines
Sat 12/138:31 pmSFO - ORD
1 stop7h 50mHawaiian Airlines
Deal found 11/27$255
This Kiwi.com deal was found by Cheapflights users on 11/27. 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.
Mon 12/156:15 amMDW - SFO
1 stop9h 13mFrontier
Sat 1/314:46 pmSFO - MDW
2 stops16h 59mFrontier
Deal found 11/27$256
This Kiwi.com deal was found by Cheapflights users on 11/27. 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 12/126:11 amORD - SFO
1 stop9h 07mMultiple Airlines
Sat 12/138:31 pmSFO - ORD
1 stop7h 50mMultiple Airlines
Deal found 11/27$256

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 November 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$141
(Kiwi.com)

One-way from

$85
(Kiwi.com)

Popular in

November

Cheapest in

July

Average price

$426

Good round-trip deal

$375 or less

Good one-way deal

$193 or less
Provider with most accurate pricing for Chicago (CHI)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-San Francisco flights.
Search Deals
From Illinois to San Francisco
Search Deals
One-way flight from Illinois to San Francisco
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Illinois to San Francisco.
Search Deals
Price to beat on a one-way flight from Illinois to San Francisco.
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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 November 29, 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

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Fri 1/23

7:16 pm-11:47 pm

1 stop6h 31m

San Francisco

Wed 1/28

12:40 am-9:08 am

1 stop6h 28m

$259

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sun 1/18

2:06 pm-9:58 pm

2 stops9h 52m

San Francisco

Tue 1/27

2:52 pm-11:37 pm

1 stop6h 45m

$261

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 1/8

2:06 pm-11:03 pm

2 stops10h 57m

San Francisco

Sat 1/10

7:00 am-11:37 pm

1 stop14h 37m

$264

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 1/9

2:20 pm-10:55 pm

2 stops10h 35m

San Francisco

Mon 1/12

12:40 am-11:47 am

1 stop9h 07m

$265

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 1/15

2:20 pm-10:55 pm

2 stops10h 35m

San Francisco

Tue 1/20

12:10 pm-9:05 pm

1 stop6h 55m

$265

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 2/12

6:51 pm-11:47 pm

1 stop6h 56m

San Francisco

Tue 2/17

6:00 am-4:41 pm

1 stop8h 41m

$266

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 1/9

7:00 am-5:49 pm

2 stops12h 49m

San Francisco

Mon 1/12

10:35 am-9:35 pm

2 stops9h 00m

$274

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Sun 1/25

6:40 am-3:58 pm

2 stops11h 18m

San Francisco

Thu 1/29

10:30 am-9:38 pm

2 stops9h 08m

$274

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 1/30

6:10 am-3:58 pm

2 stops11h 48m

San Francisco

Mon 2/2

10:30 am-9:38 pm

2 stops9h 08m

$274

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 1/10

8:15 am-11:15 am

Nonstop5h 00m

San Francisco

Sun 1/11

4:00 pm-12:25 am

1 stop6h 25m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/28

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 $204). 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 November 29, 2025.

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 at noon.

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 December 16, 2024.

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. Monday evenings 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 November 29, 2025.

The most flights from USIL to SFO are scheduled on a Friday (69 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (22 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?

    Delta, Alaska Airlines, and Southwest can get you from Illinois to San Francisco in just under 5h. Your travel time can differ by up to 4h 52m. 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 Delta, with whom users have recently found tickets for as low as $137. However, be on the lookout for offers from Southwest and United 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 (90%), ITA Airways (87%), Air China (85%).

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

    While on average a flight from Illinois to San Francisco is generally $1,218, our data shows the cheapest flight currently is $129. When looking at the most popular route, (Chicago O'Hare Intl - San Francisco), you can expect to pay $169 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 $204). 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
Livermore
Turlock
Manteca
Watsonville
Sunnyvale
Santa Clara
San Bruno
Daly City
Redwood City
Vallejo
Hollister
Foster City
Milpitas
Union City
Davis
Hayward
Burlingame

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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 November 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$241FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$375FlexibilityNo cancel feeOn-time83%
DeltaCheapest$128Average$328FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$138Average$393FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$188Average$296FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$459FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$204Average$401FlexibilityNo cancel feeOn-time69%

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