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$102+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
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 July 2, 2025.

Round-trip from

$204
(Frontier)

One-way from

$102
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$293

Good round-trip deal

$179 or less

Good one-way deal

$147 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. 8% potential increase in price ($28 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 July 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 July 2, 2025.

This Frontier deal was found by Cheapflights users on 6/30. 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 8/257:00 amORD - SFO
1 stop7h 07mFrontier
Sat 9/610:49 amSFO - ORD
1 stop8h 39mFrontier
Deal found 6/30$204
This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/213:52 pmMDW - SFO
1 stop8h 58mFrontier
Mon 8/256:26 amSFO - MDW
1 stop15h 58mFrontier
Deal found 7/2$205
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/168:10 amMDW - SFO
Nonstop4h 35mSouthwest
Sat 8/231:00 pmSFO - MDW
1 stop8h 25mSouthwest
Deal found 7/2$207
This American Airlines deal was found by Cheapflights users on 6/30. 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.
Thu 8/283:17 pmORD - SFO
Nonstop4h 35mAmerican Airlines
Tue 9/22:26 pmSFO - ORD
Nonstop4h 22mAmerican Airlines
Deal found 6/30$207
This Southwest deal was found by Cheapflights users on 6/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/237:00 amORD - SFO
1 stop6h 20mSouthwest
Sun 8/3110:30 amSFO - ORD
1 stop9h 00mSouthwest
Deal found 6/30$208
This Hawaiian Airlines deal was found by Cheapflights users on 6/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/87:18 pmORD - SFO
Nonstop4h 48mHawaiian Airlines
Mon 8/1111:55 amSFO - ORD
Nonstop4h 23mHawaiian Airlines
Deal found 6/30$217
This WAYA deal was found by Cheapflights users on 7/1. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/167:18 pmORD - SFO
Nonstop4h 48mMultiple Airlines
Mon 8/183:48 pmSFO - ORD
1 stop11h 02mMultiple Airlines
Deal found 7/1$221
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/112:54 pmORD - SFO
1 stop8h 50mAlaska Airlines
Sun 11/168:00 amSFO - ORD
1 stop19h 01mAlaska Airlines
Deal found 6/30$226
This FlightHub deal was found by Cheapflights users on 6/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:55 pmSTL - SFO
1 stop28h 35mFrontier
Fri 10/36:29 amSFO - STL
1 stop24h 37mFrontier
Deal found 6/30$242
This Delta deal was found by Cheapflights users on 6/30. 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.
Fri 8/1512:43 pmMDW - SFO
1 stop8h 09mDelta
Mon 8/189:35 pmSFO - MDW
1 stop10h 01mDelta
Deal found 6/30$257
This American Airlines deal was found by Cheapflights users on 6/30. 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 8/164:15 pmPIA - SFO
1 stop8h 34mAmerican Airlines
Sat 8/1612:45 amSFO - PIA
1 stop8h 06mAmerican Airlines
Deal found 6/30$283
This American Airlines deal was found by Cheapflights users on 7/2. 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.
Wed 7/234:22 pmMLI - SFO
1 stop8h 25mAmerican Airlines
Mon 7/285:23 amSFO - MLI
1 stop8h 26mAmerican Airlines
Deal found 7/2$289

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 July 2, 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

Mon 8/25

7:00 am-12:07 pm

1 stop7h 07m

San Francisco

Sat 9/6

10:49 am-9:28 pm

1 stop8h 39m

$204

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 8/21

3:52 pm-10:50 pm

1 stop8h 58m

San Francisco

Mon 8/25

6:26 am-12:24 am

1 stop15h 58m

$205

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 8/16

8:10 am-10:45 am

Nonstop4h 35m

San Francisco

Sat 8/23

6:50 am-4:30 pm

1 stop7h 40m

$207

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 8/28

3:17 pm-5:52 pm

Nonstop4h 35m

San Francisco

Tue 9/2

2:26 pm-8:48 pm

Nonstop4h 22m

$207

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 8/23

7:00 am-11:20 am

1 stop6h 20m

San Francisco

Sun 8/31

10:30 am-9:30 pm

1 stop9h 00m

$208

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 8/8

7:18 pm-10:06 pm

Nonstop4h 48m

San Francisco

Mon 8/11

11:55 am-6:18 pm

Nonstop4h 23m

$217

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sat 8/16

7:18 pm-10:06 pm

Nonstop4h 48m

San Francisco

Mon 8/18

3:48 pm-4:50 am

1 stop11h 02m

$221

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 11/11

2:54 pm-9:44 pm

1 stop8h 50m

San Francisco

Sun 11/16

8:00 am-5:01 am

1 stop19h 01m

$226

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 9/26

7:55 pm-10:30 pm

1 stop28h 35m

San Francisco

Fri 10/3

6:29 am-9:06 am

1 stop24h 37m

$242

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Fri 8/15

12:43 pm-6:52 pm

1 stop8h 09m

San Francisco

Mon 8/18

9:35 pm-9:36 am

1 stop10h 01m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 57 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 $360). 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 July 2, 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 July 2, 2025.

The most flights from USIL to SFO are scheduled on a Wednesday (96 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated July 2, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Illinois to San Francisco by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,983 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,540 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $102. 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 (87%), Alaska Airlines (86%), Air China (86%).

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

    While on average a flight from Illinois to San Francisco is generally $1,098, 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 $188 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 $360). 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
Roseville
Mountain View
South San Francisco
Livermore
Santa Cruz
Turlock
Manteca
Watsonville
Antioch
Hollister
Newark
Alameda
Hayward
Milpitas
Sunnyvale
Daly City
Campbell
Foster City
Capitola
Richmond

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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 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 July 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$244FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$383FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$179Average$397FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$187Average$288FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$442FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$226Average$386FlexibilityNo cancel feeOn-time63%

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