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$99+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SFO
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$201
(CheapOair)

One-way from

$99
(Alaska Airlines)

Popular in

December

Cheapest in

September

Average price

$288

Good round-trip deal

$263 or less

Good one-way deal

$142 or less
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
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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 ($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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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 April 17, 2025.

This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/164:15 pmORD - SFO
1 stop23h 00mFrontier
Sun 5/182:53 pmSFO - ORD
1 stop12h 17mFrontier
Deal found 4/16$201
This Trip.com deal was found by Cheapflights users on 4/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/152:45 pmMDW - SFO
1 stop10h 21mFrontier
Sun 5/189:59 pmSFO - MDW
1 stop12h 25mFrontier
Deal found 4/16$205
This Southwest deal was found by Cheapflights users on 4/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/15:15 amMDW - SFO
1 stop6h 10mSouthwest
Tue 7/87:45 pmSFO - MDW
1 stop7h 15mSouthwest
Deal found 4/16$207
This United Airlines deal was found by Cheapflights users on 4/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/89:05 pmORD - SFO
Nonstop4h 54mUnited Airlines
Tue 5/1311:20 pmSFO - ORD
Nonstop4h 25mUnited Airlines
Deal found 4/16$207
This Hawaiian Airlines deal was found by Cheapflights users on 4/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/307:59 pmORD - SFO
Nonstop4h 50mHawaiian Airlines
Tue 6/36:49 pmSFO - ORD
1 stop8h 51mHawaiian Airlines
Deal found 4/16$208
This Lucky2Go deal was found by Cheapflights users on 4/17. 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 Lucky2Go is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/95:21 pmORD - SFO
1 stop8h 48mMultiple Airlines
Tue 5/1311:48 amSFO - ORD
Nonstop4h 32mMultiple Airlines
Deal found 4/17$212
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:58 pmORD - SFO
Nonstop4h 59mAlaska Airlines
Mon 5/1211:48 amSFO - ORD
Nonstop4h 32mAlaska Airlines
Deal found 4/16$217
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/164:51 pmORD - SFO
Nonstop4h 46mAmerican Airlines
Sun 5/1811:49 pmSFO - ORD
Nonstop4h 18mAmerican Airlines
Deal found 4/17$237
This CheapOair deal was found by Cheapflights users on 4/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/237:24 pmSTL - SFO
1 stop6h 45mFrontier
Fri 5/306:39 pmSFO - STL
1 stop13h 30mFrontier
Deal found 4/17$251
This Delta deal was found by Cheapflights users on 4/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/256:24 amORD - SFO
1 stop9h 05mDelta
Sat 5/311:45 pmSFO - ORD
1 stop8h 14mDelta
Deal found 4/16$256
This Delta deal was found by Cheapflights users on 4/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/11:09 pmMDW - SFO
1 stop7h 04mDelta
Tue 7/1512:40 amSFO - MDW
1 stop5h 56mDelta
Deal found 4/16$257
This American Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/303:37 pmPIA - SFO
1 stop9h 40mAmerican Airlines
Mon 6/211:49 pmSFO - PIA
1 stop8h 56mAmerican Airlines
Deal found 4/16$259

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 April 17, 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 5/16

4:15 pm-1:15 pm

1 stop23h 00m

San Francisco

Sun 5/18

2:53 pm-5:10 am

1 stop12h 17m

$201

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Thu 5/15

2:45 pm-11:06 pm

1 stop10h 21m

San Francisco

Sun 5/18

9:59 pm-12:24 pm

1 stop12h 25m

$205

ChicagoSan Francisco

MDW - SFO

MDWSFO

Chicago Midway

Tue 7/1

5:15 am-9:25 am

1 stop6h 10m

San Francisco

Wed 7/9

7:45 pm-5:00 am

1 stop7h 15m

$207

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/8

6:58 pm-9:57 pm

Nonstop4h 59m

San Francisco

Tue 5/13

11:48 am-6:20 pm

Nonstop4h 32m

$207

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 5/9

5:21 pm-12:09 am

1 stop8h 48m

San Francisco

Tue 5/13

11:48 am-6:20 pm

Nonstop4h 32m

$212

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/8

5:05 am-9:36 am

1 stop6h 31m

San Francisco

Mon 5/12

12:10 am-6:30 am

Nonstop4h 20m

$217

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Thu 5/29

7:59 pm-10:49 pm

Nonstop4h 50m

San Francisco

Sat 5/31

12:33 pm-6:59 pm

Nonstop4h 26m

$229

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Fri 5/16

4:51 pm-7:37 pm

Nonstop4h 46m

San Francisco

Sun 5/18

11:49 pm-6:07 am

Nonstop4h 18m

$237

St. LouisSan Francisco

STL - SFO

STLSFO

Lambert-St Louis

Fri 5/23

7:24 pm-12:09 am

1 stop6h 45m

San Francisco

Fri 5/30

6:39 pm-10:09 am

1 stop13h 30m

$251

ChicagoSan Francisco

ORD - SFO

ORDSFO

Chicago O'Hare Intl

Sun 5/25

6:24 am-1:29 pm

1 stop9h 05m

San Francisco

Sat 5/31

1:45 pm-11:59 pm

1 stop8h 14m

$256

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

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 $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 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 April 17, 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 April 17, 2025.

The most flights from USIL to SFO are scheduled on a Thursday (80 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (47 on average).

Rainfall in San Francisco by month

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

In terms of precipitation, rainfall in San Francisco 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 when rainfall is around 0.0 in.

Temperature in San Francisco by month

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

If weather is an important factor for your trip to San Francisco, 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

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 April 17, 2025.
See what other customers who have flown with Breeze Airways, Alaska Airlines and Southwest from Illinois to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!
Breeze Airways
8.1
Very good
158 reviews
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!
Alaska Airlines
8.0
Very good
9,887 reviews
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!
Southwest
8.0
Very good
4,280 reviews
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!
Delta
8.0
Very good
7,916 reviews
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!
Hawaiian Airlines
7.9
Good
2,385 reviews
Breeze Airways
8.1
Very good
158 reviews

Food

6.7

Comfort

8.2

Entertainment

6.6

Boarding

8.3

Overall

8.1

Crew

8.8

Reviews

1 / 11
10.0
Excellent

Dena,Dec 2024

LAS - BDL

It was comfortable and the crew was great! A few free snacks offered would be nice!

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 Alaska Airlines, with whom users have recently found tickets for as low as $99. However, be on the lookout for offers from Frontier and Southwest, 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 (97%), Air China (94%), China Southern (89%).

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

    While on average a flight from Illinois to San Francisco is generally $817, 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 $179 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 $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

Traveling to a place near Illinois?

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

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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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$224FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$268FlexibilityNo cancel feeOn-time85%
DeltaCheapest$128Average$385FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$157Average$286FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$179Average$438FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$197Average$448FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$257Average$439FlexibilityNo cancel feeOn-time63%

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