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$51+ Cheap flights from Illinois to San Francisco Bay Area

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Aug 7 — Aug 141
Thu 8/7
Thu 8/14
1 adult, Economy
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Cheap flight deals from Illinois to San Francisco Bay Area

Keep the following information in mind while searching for Illinois to San Francisco Bay Area flight deals. Data was last updated August 2, 2025.

Round-trip from

$105
(CheapOair)

One-way from

$51
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$309
From Illinois to San Francisco Bay Area
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One-way flight from Illinois to San Francisco Bay Area
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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 ($6 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Illinois to San Francisco Bay Area

Cheapest flights from Illinois to San Francisco Bay Area
Explore the most affordable flight options available from Illinois to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 2, 2025.

This CheapOair deal was found by Cheapflights users on 8/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:21 pmORD - OAK
1 stop7h 06mSpirit Airlines
Sat 9/66:30 amOAK - ORD
1 stop13h 02mSpirit Airlines
Deal found 8/1$105
This FlightHub deal was found by Cheapflights users on 8/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/99:00 amORD - SJC
1 stop13h 00mSpirit Airlines
Wed 9/106:35 amSJC - ORD
1 stop12h 57mSpirit Airlines
Deal found 8/1$112
This American Airlines deal was found by Cheapflights users on 8/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:45 amORD - SFO
Nonstop4h 30mAmerican Airlines
Sun 8/318:00 amSFO - ORD
Nonstop4h 20mAmerican Airlines
Deal found 8/1$202
This Booking.com deal was found by Cheapflights users on 8/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:00 amORD - SJC
1 stop11h 46mMultiple Airlines
Fri 9/1212:25 pmSJC - ORD
1 stop9h 34mMultiple Airlines
Deal found 8/1$204
This Southwest deal was found by Cheapflights users on 7/30. 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.
Wed 9/33:50 pmMDW - SFO
Nonstop4h 35mSouthwest
Mon 9/87:15 amSFO - MDW
Nonstop4h 05mSouthwest
Deal found 7/30$207
This Southwest deal was found by Cheapflights users on 7/31. 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 7/31$208
This Alaska Airlines deal was found by Cheapflights users on 7/31. 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.
Wed 10/88:20 amORD - SFO
1 stop7h 41mAlaska Airlines
Tue 10/1410:26 amSFO - ORD
1 stop11h 33mAlaska Airlines
Deal found 7/31$216
This Kissandfly.com deal was found by Cheapflights users on 8/2. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/168:00 amORD - SFO
1 stop9h 52mHawaiian Airlines
Tue 9/232:22 pmSFO - ORD
Nonstop4h 18mHawaiian Airlines
Deal found 8/2$219
This Alaska Airlines deal was found by Cheapflights users on 7/31. 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 10/148:20 amORD - SJC
1 stop27h 37mAlaska Airlines
Wed 10/151:30 pmSJC - ORD
1 stop8h 29mAlaska Airlines
Deal found 7/31$224
This Southwest deal was found by Cheapflights users on 8/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/246:15 amORD - OAK
1 stop7h 40mSouthwest
Sun 9/286:40 amOAK - ORD
1 stop6h 40mSouthwest
Deal found 8/1$227
This Cheapflightsfares deal was found by Cheapflights users on 8/2. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/161:39 pmORD - SFO
1 stop8h 00mFrontier
Sat 8/2310:29 pmSFO - ORD
1 stop10h 10mFrontier
Deal found 8/2$234
This Frontier deal was found by Cheapflights users on 7/31. 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.
Tue 8/1211:39 amMDW - SFO
1 stop11h 08mFrontier
Wed 8/1311:30 pmSFO - MDW
1 stop11h 59mFrontier
Deal found 7/31$238

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to San Francisco Bay Area 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 2, 2025.
Use the filters below to find and compare flights from Illinois to San Francisco Bay Area that are best for you.

Fly from

Illinois

Fly to

San Francisco Bay Area

Route

Depart

Return

Price

ChicagoOakland

ORD - OAK

ORDOAK

Chicago O'Hare Intl

Wed 9/3

6:21 pm-11:27 pm

1 stop7h 06m

Oakland

Sat 9/6

6:30 am-9:32 pm

1 stop13h 02m

$105

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Tue 9/9

9:00 am-8:00 pm

1 stop13h 00m

San Jose

Wed 9/10

6:35 am-9:32 pm

1 stop12h 57m

$112

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 8/29

6:45 am-9:15 am

Nonstop4h 30m

San Francisco

Sun 8/31

8:00 am-2:20 pm

Nonstop4h 20m

$202

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Tue 8/26

6:00 am-3:46 pm

1 stop11h 46m

San Jose

Fri 9/12

12:25 pm-11:59 pm

1 stop9h 34m

$204

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Wed 9/3

3:50 pm-6:25 pm

Nonstop4h 35m

San Francisco

Mon 9/8

7:15 am-1:20 pm

Nonstop4h 05m

$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

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

$216

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Tue 9/16

8:00 am-3:52 pm

1 stop9h 52m

San Francisco

Tue 9/23

2:22 pm-8:40 pm

Nonstop4h 18m

$219

ChicagoOakland

ORD - OAK

ORDOAK

Chicago O'Hare Intl

Tue 9/16

12:40 pm-8:45 pm

2 stops10h 05m

Oakland

Tue 9/30

5:35 am-2:10 pm

1 stop6h 35m

$222

ChicagoSan Jose

ORD - SJC

ORDSJC

Chicago O'Hare Intl

Tue 10/14

8:20 am-9:57 am

1 stop27h 37m

San Jose

Wed 10/15

1:30 pm-11:59 pm

1 stop8h 29m

$224

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to San Francisco Bay Area

Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area 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 Bay Area

What is the cheapest month to book a flight from Illinois to San Francisco Bay Area?

Currently, January is the cheapest month in which you can book a flight from Illinois to San Francisco Bay Area (average of $276). Flying from Illinois to San Francisco Bay Area 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 XIH?

Find hourly flight availability from Illinois to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 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 Bay Area as you normally would.

Weekly flight availability from Illinois to San Francisco Bay Area

Explore weekly flight availability from Illinois to San Francisco Bay Area. 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 2, 2025.

The most flights from USIL to zzXIH are scheduled on a Friday (87 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (30 on average).

Reviews of airlines servicing San Francisco Bay Area

Get insights into the airlines that provide service to San Francisco Bay Area. 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 Bay Area. Reviews last updated August 2, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to San Francisco Bay Area. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

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

Boarding

8.1

Food

7.1

Overall

8.0

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
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

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
7,985 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

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
2,614 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

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
8,905 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Food

7.1

Overall

8.0

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 Bay Area. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Illinois to San Francisco Bay Area one-way?

    The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $51. However, be on the lookout for offers from Southwest and Hawaiian Airlines, as they are both options that can get you from Illinois to San Francisco Bay Area for a low price.

  • Can I find deals for flights from Illinois to San Francisco Bay Area that include hotel bookings?

    Yes. In addition to deals on Illinois to San Francisco Bay Area flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to San Francisco Bay Area?

    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 Bay Area.

  • Can I find deals for business class flights from Illinois to San Francisco Bay Area?

    Yes. Cheapflights offers flight deals from Illinois to San Francisco Bay Area 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 Bay Area?

    Currently, January is the cheapest month in which you can book a flight from Illinois to San Francisco Bay Area (average of $276). Flying from Illinois to San Francisco Bay Area 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

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Alternative routes for Illinois to San Francisco Bay Area

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Illinois to San Francisco Bay Area

Discover the top 9 airlines that operate flights from Illinois to San Francisco Bay Area. 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 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$255FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$217FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$112Average$305FlexibilityNo cancel feeOn-time83%
Spirit AirlinesCheapest$119Average$220FlexibilityNo cancel feeOn-time65%
DeltaCheapest$128Average$347FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$138Average$412FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$179Average$443FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$187Average$287FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$483FlexibilityNo cancel feeOn-time71%

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