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$71+ 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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
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 August 18, 2025.

Round-trip from

$198
(American Airlines)

One-way from

$71
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$317

Good round-trip deal

$217 or less

Good one-way deal

$108 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. 7% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 18, 2025.

This American Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 9/66:37 pmORD - SFO
Nonstop4h 51mAmerican Airlines
Sat 9/131:21 pmSFO - ORD
Nonstop4h 24mAmerican Airlines
Deal found 8/16$198
This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/106:24 pmMDW - SFO
1 stop7h 50mFrontier
Mon 10/1310:23 pmSFO - MDW
1 stop13h 15mFrontier
Deal found 8/17$199
This Frontier deal was found by Cheapflights users on 8/17. 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.
Thu 9/1110:42 amORD - SFO
2 stops14h 33mFrontier
Mon 9/1511:57 pmSFO - ORD
1 stop8h 43mFrontier
Deal found 8/17$199
This Kiwi.com deal was found by Cheapflights users on 8/18. 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 8/229:45 pmORD - SFO
1 stop25h 13mFrontier
Thu 9/42:17 pmSFO - ORD
1 stop6h 58mFrontier
Deal found 8/18$200
This Frontier deal was found by Cheapflights users on 8/18. 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.
Thu 10/210:13 amMDW - SFO
2 stops15h 02mFrontier
Mon 10/66:29 amSFO - MDW
1 stop7h 24mFrontier
Deal found 8/18$201
This Frontier deal was found by Cheapflights users on 8/17. 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 9/1312:22 pmORD - SFO
1 stop10h 59mFrontier
Tue 9/238:00 amSFO - ORD
2 stops11h 28mFrontier
Deal found 8/17$201
This Frontier deal was found by Cheapflights users on 8/17. 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.
Wed 9/39:00 pmMDW - SFO
2 stops14h 50mFrontier
Fri 9/511:57 pmSFO - MDW
1 stop8h 31mFrontier
Deal found 8/17$202
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 10/107:15 amORD - SFO
1 stop7h 09mFrontier
Sun 10/121:29 pmSFO - ORD
1 stop6h 55mFrontier
Deal found 8/17$202
This Frontier deal was found by Cheapflights users on 8/17. 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 9/611:23 amMDW - SFO
2 stops11h 58mFrontier
Thu 9/1110:19 amSFO - MDW
1 stop9h 39mFrontier
Deal found 8/17$203
This Frontier deal was found by Cheapflights users on 8/17. 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 9/612:22 pmORD - SFO
1 stop10h 59mFrontier
Sat 9/138:00 amSFO - ORD
2 stops13h 58mFrontier
Deal found 8/17$203
This Frontier deal was found by Cheapflights users on 8/17. 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.
Thu 9/410:13 amMDW - SFO
2 stops15h 02mFrontier
Sun 9/711:57 pmSFO - MDW
1 stop11h 14mFrontier
Deal found 8/17$204
This Frontier deal was found by Cheapflights users on 8/17. 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.
Wed 9/37:20 amORD - SFO
2 stops16h 01mFrontier
Tue 9/97:10 amSFO - ORD
1 stop12h 18mFrontier
Deal found 8/17$204

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 August 18, 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 10/17

5:10 am-4:00 pm

1 stop12h 50m

San Francisco

Sun 10/19

8:27 pm-11:13 am

2 stops12h 46m

$201

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Fri 10/10

6:24 pm-12:14 am

1 stop7h 50m

San Francisco

Mon 10/13

10:23 pm-1:38 pm

1 stop13h 15m

$201

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 10/2

10:13 am-11:15 pm

2 stops15h 02m

San Francisco

Thu 10/9

3:25 pm-12:36 am

1 stop7h 11m

$202

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 9/6

11:23 am-9:21 pm

2 stops11h 58m

San Francisco

Thu 9/11

10:19 am-9:58 pm

1 stop9h 39m

$203

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 10/8

8:20 am-2:01 pm

1 stop7h 41m

San Francisco

Tue 10/14

10:26 am-11:59 pm

1 stop11h 33m

$204

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 10/22

8:20 am-5:45 pm

1 stop11h 25m

San Francisco

Wed 10/29

7:00 am-6:59 pm

1 stop9h 59m

$204

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 10/15

8:20 am-2:01 pm

1 stop7h 41m

San Francisco

Wed 10/22

10:26 am-11:59 pm

1 stop11h 33m

$204

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Wed 10/8

8:20 am-2:01 pm

1 stop7h 41m

San Francisco

Wed 10/15

10:26 am-11:59 pm

1 stop11h 33m

$204

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 10/4

11:23 am-9:21 pm

2 stops11h 58m

San Francisco

Sat 10/11

10:23 pm-11:25 pm

1 stop23h 02m

$204

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 9/11

10:13 am-11:15 pm

2 stops15h 02m

San Francisco

Sun 9/14

11:57 pm-1:11 pm

1 stop11h 14m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

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 $358). 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 August 18, 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 August 18, 2025.

The most flights from USIL to SFO are scheduled on a Monday (95 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (13 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?

    Frontier, Alaska Airlines, and United Airlines can get you from Illinois to San Francisco in just under 4h 38m. Your travel time can differ by up to 8h 12m. Airlines will cover a distance of 1841 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 $71. 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: Austrian Airlines (75%), ANA (74%), Aer Lingus (73%).

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

    While on average a flight from Illinois to San Francisco is generally $779, our data shows the cheapest flight currently is $98. When looking at the most popular route, (Chicago O'Hare Intl - San Francisco), you can expect to pay $167 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 $358). 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
Mountain View
Turlock
Santa Clara
Hollister
Antioch
Watsonville
Manteca
Sunnyvale
Newark
Milpitas
Campbell
Foster City
San Leandro
Burlingame
Redwood City
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Illinois to San Francisco

Discover the top 7 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
FrontierCheapest$122Average$264FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$316FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$141Average$387FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$180Average$372FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$188Average$286FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$440FlexibilityNo cancel feeOn-time71%

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