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San Francisco Bay Area

$55+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
May 4 — May 111
Sun 5/4
Sun 5/11
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 April 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$147
(CheapOair)

One-way from

$55
(Booking.com)

Popular in

December

Cheapest in

September

Average price

$293
Provider with most accurate pricing for Chicago (CHI)-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-San Francisco flights.
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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 ($24 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 April 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 April 29, 2025.

This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/29:02 pmORD - OAK
1 stop15h 54mSpirit Airlines
Tue 6/39:09 pmOAK - ORD
1 stop11h 46mSpirit Airlines
Deal found 4/28$148
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/286:00 amORD - OAK
1 stop9h 36mAlaska Airlines
Sat 5/312:31 pmOAK - ORD
1 stop7h 28mAlaska Airlines
Deal found 4/28$206
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Thu 6/199:09 pmORD - SFO
Nonstop4h 50mUnited Airlines
Tue 6/244:50 pmSFO - ORD
Nonstop4h 23mUnited Airlines
Deal found 4/28$207
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/242:44 pmMDW - SFO
1 stop11h 25mFrontier
Sun 6/15:45 amSFO - MDW
1 stop7h 11mFrontier
Deal found 4/28$208
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/297:59 pmORD - SFO
Nonstop4h 50mAlaska Airlines
Sun 6/17:55 pmSFO - ORD
1 stop7h 45mAlaska Airlines
Deal found 4/28$208
This Orbitz deal was found by Cheapflights users on 4/28. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:58 pmORD - SFO
Nonstop4h 59mMultiple Airlines
Mon 5/1211:50 pmSFO - ORD
1 stop14h 51mMultiple Airlines
Deal found 4/28$209
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/157:35 amORD - SFO
1 stop10h 09mFrontier
Tue 5/209:59 pmSFO - ORD
1 stop32h 23mFrontier
Deal found 4/28$211
This Southwest deal was found by Cheapflights users on 4/27. 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.
Tue 6/36:45 pmMDW - SFO
1 stop6h 35mSouthwest
Wed 6/117:45 pmSFO - MDW
1 stop7h 15mSouthwest
Deal found 4/27$216
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/38:15 pmSTL - SFO
1 stop6h 16mFrontier
Wed 5/79:59 pmSFO - STL
1 stop24h 07mFrontier
Deal found 4/28$221
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/19:55 pmSTL - SJC
1 stop22h 46mFrontier
Sun 5/412:20 pmSJC - STL
1 stop18h 49mFrontier
Deal found 4/28$221
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/36:55 pmORD - SFO
1 stop6h 25mSouthwest
Sat 6/76:25 amSFO - ORD
1 stop9h 30mSouthwest
Deal found 4/28$222
This Hawaiian Airlines deal was found by Cheapflights users on 4/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:58 pmORD - SFO
Nonstop4h 59mHawaiian Airlines
Sun 5/116:00 amSFO - ORD
1 stop10h 01mHawaiian Airlines
Deal found 4/28$228

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 April 29, 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

Mon 6/2

9:02 pm-10:56 am

1 stop15h 54m

Oakland

Tue 6/3

9:09 pm-10:55 am

1 stop11h 46m

$148

ChicagoOakland

ORD - OAK

ORDOAK

Chicago O'Hare Intl

Wed 5/28

6:00 am-1:36 pm

1 stop9h 36m

Oakland

Sat 5/31

2:31 pm-11:59 pm

1 stop7h 28m

$206

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 6/19

9:09 pm-11:59 pm

Nonstop4h 50m

San Francisco

Tue 6/24

4:50 pm-11:13 pm

Nonstop4h 23m

$207

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Sat 5/24

2:44 pm-12:09 am

1 stop11h 25m

San Francisco

Fri 5/30

11:38 pm-1:49 pm

1 stop12h 11m

$208

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/29

7:59 pm-10:49 pm

Nonstop4h 50m

San Francisco

Sun 6/1

7:55 pm-5:40 am

1 stop7h 45m

$208

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/8

6:58 pm-9:57 pm

Nonstop4h 59m

San Francisco

Fri 5/9

11:50 pm-1:41 pm

1 stop11h 51m

$209

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/15

7:35 am-3:44 pm

1 stop10h 09m

San Francisco

Tue 5/20

9:59 pm-8:22 am

1 stop32h 23m

$211

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 6/3

6:45 pm-11:20 pm

1 stop6h 35m

San Francisco

Wed 6/11

7:45 pm-5:00 am

1 stop7h 15m

$216

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Sat 5/3

8:15 pm-12:31 am

1 stop6h 16m

San Francisco

Wed 5/7

9:59 pm-12:06 am

1 stop24h 07m

$221

St. LouisSan Jose

STL - SJC

STLSJC

Lambert-St Louis

Thu 5/1

9:55 pm-6:41 pm

1 stop22h 46m

San Jose

Sun 5/4

12:20 pm-9:09 am

1 stop18h 49m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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 $393). 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 April 29, 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 April 29, 2025.

The most flights from USIL to zzXIH are scheduled on a Monday (73 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (50 on average).

Rainfall in San Francisco Bay Area by month

Plan your trip to San Francisco Bay Area by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco Bay Area ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco Bay Area when rainfall is around 0.0 in.

Temperature in San Francisco Bay Area by month

Plan your trip to San Francisco Bay Area by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco Bay Area, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 April 29, 2025.
To help decide which airline to fly from Illinois to San Francisco Bay Area, see what other customers have to say about Alaska Airlines, Southwest and Delta. 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
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
9,949 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
4,292 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
7,929 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,402 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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 $55. However, be on the lookout for offers from Frontier and United 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 $393). 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 8 airlines flying from Illinois to San Francisco Bay Area

Discover the top 8 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$238FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$268FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$129Average$242FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$140Average$321FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$141Average$474FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$197Average$480FlexibilityNo cancel feeOn-time71%
DeltaCheapest$219Average$394FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$247Average$434FlexibilityNo cancel feeOn-time63%

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