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$62+ Cheap flights from San Francisco Bay Area to Illinois

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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ORD
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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Cheap flight deals from San Francisco Bay Area to Illinois

Keep the following information in mind while searching for San Francisco Bay Area to Illinois flight deals. Data was last updated April 29, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$208
(Frontier)

One-way from

$70
(Mytrip)

Popular in

December

Cheapest in

February

Average price

$314
Provider with most accurate pricing for San Francisco-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Chicago (CHI) flights.
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From San Francisco Bay Area to Illinois
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One-way flight from San Francisco Bay Area to Illinois
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Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 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 San Francisco Bay Area to Illinois

Cheapest flights from San Francisco Bay Area to Illinois
Explore the most affordable flight options available from San Francisco Bay Area to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

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 5/3110:19 pmSFO - MDW
1 stop8h 44mFrontier
Sun 6/19:12 pmMDW - SFO
1 stop15h 11mFrontier
Deal found 4/28$208
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.
Sun 5/1812:20 pmSJC - STL
1 stop18h 49mFrontier
Sat 5/247:55 pmSTL - SJC
1 stop17h 26mFrontier
Deal found 4/28$211
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 5/19:50 pmSFO - ORD
1 stop29h 20mFrontier
Sat 5/3111:55 amORD - SFO
1 stop12h 28mFrontier
Deal found 4/28$211
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/155:04 amSFO - ORD
Nonstop4h 22mUnited Airlines
Sat 5/246:15 pmORD - SFO
Nonstop4h 49mUnited Airlines
Deal found 4/27$212
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/295:45 amSFO - ORD
1 stop21h 40mMultiple Airlines
Mon 6/29:56 pmORD - SFO
1 stop25h 25mMultiple Airlines
Deal found 4/27$214
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.
Wed 6/45:40 amSFO - MDW
1 stop6h 15mSouthwest
Sat 6/77:00 pmMDW - SFO
1 stop6h 10mSouthwest
Deal found 4/28$216
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.
Tue 5/278:49 pmSFO - ORD
1 stop6h 51mAlaska Airlines
Wed 6/117:59 pmORD - SFO
Nonstop4h 50mAlaska Airlines
Deal found 4/28$217
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 6/36:00 amSFO - ORD
1 stop8h 45mSouthwest
Wed 6/182:50 pmORD - SFO
1 stop10h 35mSouthwest
Deal found 4/28$222
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.
Wed 5/214:28 pmSJC - ORD
1 stop10h 57mSpirit Airlines
Mon 5/269:02 pmORD - SJC
1 stop15h 03mSpirit Airlines
Deal found 4/28$228
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.
Mon 5/127:41 pmSJC - ORD
1 stop7h 29mFrontier
Thu 5/226:00 amORD - SJC
1 stop7h 21mFrontier
Deal found 4/28$238
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 5/87:41 pmSJC - MDW
1 stop17h 07mFrontier
Sun 5/118:03 pmMDW - SJC
1 stop17h 17mFrontier
Deal found 4/28$241
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/2011:55 pmSFO - ORD
Nonstop4h 15mAmerican Airlines
Sat 6/218:05 amORD - SFO
1 stop8h 28mAmerican Airlines
Deal found 4/28$244

Cheapflights Fare Finder

Customize your flight search to find flights from San Francisco Bay Area to Illinois 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 San Francisco Bay Area to Illinois that are best for you.

Fly from

San Francisco Bay Area

Fly to

Illinois

Route

Depart

Return

Price

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Sat 5/31

10:19 pm-9:03 am

1 stop8h 44m

Chicago Midway

Sun 6/1

9:12 pm-10:23 am

1 stop15h 11m

$208

San JoseSt. Louis

SJC - STL

SJCSTL

San Jose

Sun 5/18

12:20 pm-9:09 am

1 stop18h 49m

Lambert-St Louis

Sat 5/24

7:55 pm-11:21 am

1 stop17h 26m

$211

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 5/1

9:50 pm-5:10 am

1 stop29h 20m

Chicago O'Hare Intl

Sat 5/31

11:55 am-10:23 pm

1 stop12h 28m

$211

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 5/15

5:04 am-11:26 am

Nonstop4h 22m

Chicago O'Hare Intl

Sat 5/24

6:15 pm-9:04 pm

Nonstop4h 49m

$212

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Thu 5/29

5:45 am-5:25 am

1 stop21h 40m

Chicago O'Hare Intl

Mon 6/2

9:56 pm-9:21 pm

1 stop25h 25m

$214

San FranciscoChicago

SFO - MDW

SFOMDW

San Francisco

Wed 6/4

5:40 am-1:55 pm

1 stop6h 15m

Chicago Midway

Sat 6/7

7:00 pm-11:10 pm

1 stop6h 10m

$216

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 5/27

8:49 pm-5:40 am

1 stop6h 51m

Chicago O'Hare Intl

Wed 6/11

7:59 pm-10:49 pm

Nonstop4h 50m

$217

San FranciscoChicago

SFO - ORD

SFOORD

San Francisco

Tue 6/3

6:00 am-4:45 pm

1 stop8h 45m

Chicago O'Hare Intl

Wed 6/18

2:50 pm-11:25 pm

1 stop10h 35m

$222

San JoseChicago

SJC - ORD

SJCORD

San Jose

Wed 5/21

4:28 pm-5:25 am

1 stop10h 57m

Chicago O'Hare Intl

Mon 5/26

9:02 pm-10:05 am

1 stop15h 03m

$228

San JoseChicago

SJC - ORD

SJCORD

San Jose

Mon 5/12

7:41 pm-5:10 am

1 stop7h 29m

Chicago O'Hare Intl

Thu 5/22

6:00 am-11:21 am

1 stop7h 21m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

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

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

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

Currently, August is the cheapest month in which you can book a flight from San Francisco Bay Area to Illinois (average of $245). Flying from San Francisco Bay Area to Illinois in March is currently the most expensive (average of $321). 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 XIH to IL?

Find hourly flight availability from San Francisco Bay Area to Illinois. 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.

When flying from San Francisco Bay Area to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from San Francisco Bay Area to Illinois

Explore weekly flight availability from San Francisco Bay Area to Illinois. 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 zzXIH to USIL are scheduled on a Monday (77 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (55 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated April 29, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from San Francisco Bay Area to Illinois. You can also see how each airline stacks up 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 San Francisco Bay Area to Illinois. 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 San Francisco Bay Area to Illinois one-way?

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $70. Users have also found prices from $90 and $100 on Southwest and American Airlines, respectively.

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

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

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco Bay Area to Illinois.

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

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

    Currently, August is the cheapest month in which you can book a flight from San Francisco Bay Area to Illinois (average of $245). Flying from San Francisco Bay Area to Illinois in March is currently the most expensive (average of $321). 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 San Francisco Bay Area to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from San Francisco Bay Area to Illinois

Discover the top 8 airlines that operate flights from San Francisco Bay Area to Illinois. 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$55Average$238FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$113Average$264FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$138Average$381FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$138Average$337FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$185Average$439FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$197Average$475FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$208Average$449FlexibilityNo cancel feeOn-time63%
DeltaCheapest$235Average$394FlexibilityNo cancel feeOn-timeN/A

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