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$63+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 6, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/5. 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 11/243:53 pmSTL - SFO
1 stop17h 18mFrontier
Wed 12/36:00 amSFO - STL
1 stop28h 12mFrontier
Deal found 11/5$194
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/213:53 pmSTL - SFO
1 stop17h 18mFrontier
Thu 11/274:48 pmSFO - STL
1 stop16h 28mFrontier
Deal found 11/4$195
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/197:45 pmSTL - SFO
2 stops29h 44mFrontier
Thu 11/274:48 pmSFO - STL
1 stop16h 28mFrontier
Deal found 11/4$197
This Kiwi.com deal was found by Cheapflights users on 11/6. 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.
Thu 12/41:16 pmSTL - SFO
1 stop8h 47mFrontier
Thu 12/1110:10 pmSFO - STL
2 stops34h 04mFrontier
Deal found 11/6$199
This CheapOair deal was found by Cheapflights users on 11/6. 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.
Sat 12/207:43 pmSTL - SFO
1 stop6h 41mFrontier
Thu 1/85:46 pmSFO - STL
1 stop21h 03mFrontier
Deal found 11/6$200
This Expedia deal was found by Cheapflights users on 11/4. 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 11/209:54 pmSTL - SFO
1 stop25h 09mFrontier
Mon 11/242:54 pmSFO - STL
1 stop26h 04mFrontier
Deal found 11/4$201
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/197:45 pmSTL - SFO
2 stops29h 44mFrontier
Wed 12/36:00 amSFO - STL
1 stop28h 12mFrontier
Deal found 11/4$202
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 12/245:19 pmSTL - SFO
1 stop21h 15mFrontier
Sun 12/289:56 pmSFO - STL
1 stop20h 11mFrontier
Deal found 11/5$206
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/227:43 pmSTL - SFO
1 stop14h 25mFrontier
Wed 12/36:18 amSFO - STL
2 stops26h 49mFrontier
Deal found 11/4$207
This CheapOair deal was found by Cheapflights users on 11/4. 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.
Fri 11/217:43 pmSTL - SFO
1 stop14h 25mFrontier
Mon 12/16:00 amSFO - STL
1 stop13h 09mFrontier
Deal found 11/4$208
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 11/237:57 pmSTL - SFO
2 stops13h 14mFrontier
Thu 11/274:48 pmSFO - STL
1 stop16h 28mFrontier
Deal found 11/4$210
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 12/207:57 pmORD - SFO
2 stops37h 51mMultiple Airlines
Sun 1/1111:20 pmSFO - ORD
1 stop9h 29mMultiple Airlines
Deal found 11/6$247

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 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$194
(Kiwi.com)

One-way from

$63
(Trip.com)

Popular in

November

Cheapest in

July

Average price

$387

Good round-trip deal

$309 or less

Good one-way deal

$196 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. 12% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 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.
Search 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 November 6, 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 1/16

7:16 pm-11:47 pm

1 stop6h 31m

San Francisco

Wed 1/21

8:00 am-5:32 pm

1 stop7h 32m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sun 12/14

9:34 am-2:23 pm

1 stop6h 49m

San Francisco

Wed 1/7

12:47 am-9:08 am

1 stop6h 21m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 1/27

1:28 pm-6:38 pm

1 stop7h 10m

San Francisco

Mon 2/2

10:54 pm-8:54 am

1 stop8h 00m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Fri 12/12

7:02 pm-12:19 am

1 stop7h 17m

San Francisco

Wed 12/31

11:30 pm-9:05 am

1 stop7h 35m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 12/11

9:34 am-2:23 pm

1 stop6h 49m

San Francisco

Mon 12/15

2:00 pm-11:47 pm

1 stop7h 47m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 12/4

5:13 pm-12:20 am

1 stop9h 07m

San Francisco

Wed 12/10

7:15 am-4:34 pm

1 stop7h 19m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 12/13

6:00 am-12:25 pm

1 stop8h 25m

San Francisco

Wed 12/31

11:30 pm-9:05 am

1 stop7h 35m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 12/16

1:50 pm-8:28 pm

1 stop8h 38m

San Francisco

Sun 1/11

6:00 am-5:37 pm

1 stop9h 37m

$259

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Fri 12/12

9:34 am-2:23 pm

1 stop6h 49m

San Francisco

Thu 1/1

5:50 am-5:26 pm

1 stop9h 36m

$259

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 12/18

6:08 pm-11:59 pm

1 stop7h 51m

San Francisco

Sat 1/17

10:16 am-11:37 pm

1 stop11h 21m

$260

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

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 December is currently the most expensive (average of $203). 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 6, 2025.

It’s optimal to fly from Illinois to San Francisco in the evening. By choosing this option you can save up to 17% 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. Sunday at noon 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 6, 2025.

The most flights from USIL to SFO are scheduled on a Wednesday (65 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (30 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 United Airlines can get you from Illinois to San Francisco in just under 6h 31m. Your travel time can differ by up to 2h 13m. 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 Frontier, with whom users have recently found tickets for as low as $97. However, be on the lookout for offers from Alaska Airlines and Delta, 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%), Air China (86%), Qantas Airways (82%).

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

    While on average a flight from Illinois to San Francisco is generally $1,293, our data shows the cheapest flight currently is $134. When looking at the most popular route, (Chicago O'Hare Intl - San Francisco), you can expect to pay $154 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 December is currently the most expensive (average of $203). 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
Vallejo
Hollister
San Bruno
Foster City
Redwood City
Union City
Burlingame
Lodi
San Mateo
Vacaville
Lathrop

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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 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$273FlexibilityNo 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$394FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$192Average$309FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$454FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$203Average$404FlexibilityNo cancel feeOn-time69%

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