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$59+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
1 adult, Economy
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Cheap 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 December 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/29. 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 12/3111:45 amORD - SFO
1 stop24h 39mMultiple Airlines
Tue 1/132:24 pmSFO - ORD
2 stops26h 00mMultiple Airlines
Deal found 12/29$471
This Kiwi.com deal was found by Cheapflights users on 12/29. 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 12/3111:45 amORD - SFO
1 stop24h 39mMultiple Airlines
Wed 1/147:00 amSFO - ORD
2 stops30h 21mMultiple Airlines
Deal found 12/29$483
This Kiwi.com deal was found by Cheapflights users on 12/29. 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 12/3112:39 pmORD - SFO
2 stops37h 45mFrontier
Mon 1/128:58 amSFO - ORD
1 stop7h 47mFrontier
Deal found 12/29$487
This Kiwi.com deal was found by Cheapflights users on 12/29. 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 12/3111:45 amORD - SFO
1 stop24h 39mMultiple Airlines
Mon 1/128:58 amSFO - ORD
1 stop7h 47mMultiple Airlines
Deal found 12/29$500
This Kiwi.com deal was found by Cheapflights users on 12/28. 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.
Tue 12/303:27 pmORD - SFO
1 stop8h 09mFrontier
Tue 1/132:24 pmSFO - ORD
2 stops26h 00mFrontier
Deal found 12/28$549
This Kiwi.com deal was found by Cheapflights users on 12/28. 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.
Wed 12/3111:45 amORD - SFO
1 stop24h 39mMultiple Airlines
Sun 1/118:58 amSFO - ORD
1 stop9h 59mMultiple Airlines
Deal found 12/28$561
This Kiwi.com deal was found by Cheapflights users on 12/29. 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.
Tue 12/3010:10 pmSTL - SFO
1 stop25h 26mFrontier
Tue 1/67:00 amSFO - STL
1 stop25h 02mFrontier
Deal found 12/29$624
This American Airlines deal was found by Cheapflights users on 12/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:30 amBMI - SFO
2 stops11h 28mAmerican Airlines
Fri 1/26:00 amSFO - BMI
1 stop6h 59mAmerican Airlines
Deal found 12/28$643
This Kiwi.com deal was found by Cheapflights users on 12/29. 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.
Tue 12/3010:10 pmSTL - SFO
1 stop25h 26mFrontier
Fri 1/98:58 amSFO - STL
1 stop23h 04mFrontier
Deal found 12/29$647
This Kiwi.com deal was found by Cheapflights users on 12/29. 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.
Tue 12/3010:10 pmSTL - SFO
1 stop25h 26mFrontier
Thu 1/88:58 amSFO - STL
1 stop23h 04mFrontier
Deal found 12/29$669
This United Airlines deal was found by Cheapflights users on 12/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:20 pmPIA - SFO
1 stop10h 09mUnited Airlines
Fri 1/26:00 amSFO - PIA
1 stop6h 08mUnited Airlines
Deal found 12/28$679
This Kiwi.com deal was found by Cheapflights users on 12/29. 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 12/317:43 pmSTL - SFO
1 stop14h 40mFrontier
Tue 1/67:00 amSFO - STL
1 stop25h 02mFrontier
Deal found 12/29$686

Find 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 December 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$126
(Kiwi.com)

One-way from

$59
(Trip.com)

Popular in

December

Cheapest in

July

Average price

$449

Good round-trip deal

$296 or less

Good one-way deal

$239 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 ($59 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 30, 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

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 1/23

2:06 pm-7:43 pm

1 stop7h 37m

San Francisco

Wed 1/28

10:12 am-11:37 pm

1 stop11h 25m

$244

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 3/21

9:40 pm-12:20 am

Nonstop4h 40m

San Francisco

Wed 3/25

5:40 am-11:40 am

Nonstop4h 00m

$245

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 1/27

4:16 pm-7:09 pm

Nonstop4h 53m

San Francisco

Tue 2/3

12:25 pm-6:48 pm

Nonstop4h 23m

$247

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sun 2/15

11:01 am-7:56 pm

1 stop10h 55m

San Francisco

Wed 2/18

5:45 am-5:37 pm

1 stop9h 52m

$250

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Wed 1/21

10:46 am-5:43 pm

1 stop8h 57m

San Francisco

Sun 1/25

10:54 pm-8:52 am

1 stop7h 58m

$250

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 1/17

12:15 pm-7:10 pm

1 stop8h 55m

San Francisco

Tue 1/20

9:30 pm-9:05 am

1 stop9h 35m

$252

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 1/31

1:26 pm-6:38 pm

1 stop7h 12m

San Francisco

Fri 2/13

12:40 am-11:03 am

1 stop8h 23m

$257

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 1/31

12:55 pm-8:35 pm

1 stop9h 40m

San Francisco

Sat 2/14

10:45 pm-9:41 am

1 stop8h 56m

$257

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 2/20

4:20 pm-7:19 pm

Nonstop4h 59m

San Francisco

Tue 2/24

10:50 pm-5:12 am

Nonstop4h 22m

$265

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 2/12

7:55 am-10:55 am

Nonstop5h 00m

San Francisco

Tue 2/17

6:25 am-12:25 pm

Nonstop4h 00m

$265

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

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 $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 December 30, 2025.

It’s optimal to fly from Illinois to San Francisco in the morning. By choosing this option you can save up to 16% 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 27, 2025.

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 December 30, 2025.

The most flights from USIL to SFO are scheduled on a Friday (70 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (54 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, Southwest, and United Airlines can get you from Illinois to San Francisco in just under 4h 40m. Your travel time can differ by up to 2h 57m. 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 (90%), Air China (86%), China Southern (83%).

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

    While on average a flight from Illinois to San Francisco is generally $1,289, 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 $184 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
Livermore
Santa Clara
Watsonville
Redwood City
Sunnyvale
San Bruno
Daly City
Manteca
Turlock
San Carlos
Vallejo
Hollister
San Ramon
Foster City
Union City
Davis
Emeryville

Browse thousands of different options on Cheapflights for your next trip

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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 December 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$222FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$138Average$390FlexibilityNo cancel feeOn-time63%
DeltaCheapest$159Average$326FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$183Average$427FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$187Average$276FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$468FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$204Average$409FlexibilityNo cancel feeOn-time69%

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