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$168+ Cheap flights from Santa Rosa (STS) 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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheap flight deals from Santa Rosa to Illinois

Keep the following information in mind while searching for Santa Rosa to Illinois flight deals. Data was last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$299
(Mytrip)

One-way from

$168
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$350
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 Santa Rosa Sonoma County to Illinois
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One-way flight from Santa Rosa Sonoma County to Illinois
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Highest demand for flights based on searches. 5% potential increase in price ($19 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 March 2025
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Find flight deals from Santa Rosa to Illinois

Cheapest flights from Santa Rosa to Illinois
Explore the most affordable flight options available from Santa Rosa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This Mytrip deal was found by Cheapflights users on 3/26. 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 4/219:16 amSTS - ORD
2 stops42h 29mMultiple Airlines
Thu 4/249:38 pmORD - STS
2 stops17h 44mMultiple Airlines
Deal found 3/26$299
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/288:01 pmSTS - ORD
1 stop7h 39mAlaska Airlines
Tue 6/107:00 amORD - STS
2 stops18h 30mAlaska Airlines
Deal found 3/27$354
This American Airlines deal was found by Cheapflights users on 3/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/274:21 pmSTS - ORD
1 stop6h 16mAmerican Airlines
Tue 6/35:00 amORD - STS
1 stop8h 44mAmerican Airlines
Deal found 3/27$357
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/257:58 pmSTS - STL
1 stop16h 10mAlaska Airlines
Fri 5/306:22 pmSTL - STS
1 stop26h 45mAlaska Airlines
Deal found 3/27$467
This American Airlines deal was found by Cheapflights users on 3/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/174:21 pmSTS - STL
1 stop5h 37mAmerican Airlines
Sat 5/247:00 amSTL - STS
1 stop6h 44mAmerican Airlines
Deal found 3/27$488
This American Airlines deal was found by Cheapflights users on 3/26. 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 6/512:30 pmSTS - MLI
1 stop8h 39mAmerican Airlines
Sun 6/86:07 amMLI - STS
1 stop7h 38mAmerican Airlines
Deal found 3/26$611
This Mytrip deal was found by Cheapflights users on 3/26. 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 3/319:16 amSTS - STL
3 stops30h 36mMultiple Airlines
Thu 4/39:50 amSTL - STS
3 stops29h 32mMultiple Airlines
Deal found 3/26$672

Cheapflights Fare Finder

Customize your flight search to find flights from Santa Rosa 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 March 28, 2025.
Use the filters below to find and compare flights from Santa Rosa to Illinois that are best for you.

Fly from

Santa Rosa

Fly to

Illinois

Route

Depart

Return

Price

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Mon 4/21

9:16 am-5:45 am

2 stops42h 29m

Chicago O'Hare Intl

Thu 4/24

9:38 pm-1:22 pm

2 stops17h 44m

$299

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 5/28

8:01 pm-5:40 am

1 stop7h 39m

Chicago O'Hare Intl

Tue 6/10

7:00 am-11:30 pm

2 stops18h 30m

$354

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 5/27

4:21 pm-12:37 am

1 stop6h 16m

Chicago O'Hare Intl

Tue 6/3

5:00 am-11:44 am

1 stop8h 44m

$357

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Fri 4/25

7:58 pm-2:08 pm

1 stop16h 10m

Lambert-St Louis

Fri 5/30

6:22 pm-7:07 pm

1 stop26h 45m

$467

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Sat 5/17

4:21 pm-11:58 pm

1 stop5h 37m

Lambert-St Louis

Sat 5/24

7:00 am-11:44 am

1 stop6h 44m

$488

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Thu 6/5

12:30 pm-11:09 pm

1 stop8h 39m

Moline Quad-City

Sun 6/8

6:07 am-11:45 am

1 stop7h 38m

$611

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Sat 5/31

8:01 pm-5:40 am

1 stop7h 39m

$168

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Thu 4/24

7:58 pm-11:59 pm

1 stop26h 01m

$223

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Sun 6/1

4:21 pm-12:37 am

1 stop6h 16m

$234

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 6/11

12:30 pm-11:00 pm

1 stop8h 30m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Best time to book a flight from Santa Rosa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Santa Rosa 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 Santa Rosa to Illinois

What is the cheapest month to book a flight from Santa Rosa to Illinois?

Currently, August is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $245). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $323). 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 STS to IL?

Find hourly flight availability from Santa Rosa 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 March 28, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Santa Rosa to Illinois as you normally would.

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 March 28, 2025.
Read through reviews of airlines operating flights from Santa Rosa to Illinois, such as Alaska Airlines and American Airlines. 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
9,798 reviews

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,798 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,798 reviews

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

Find useful and relevant information for your journey from Santa Rosa to Illinois. 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 from for flights from Santa Rosa to Illinois?

    Most people fly from Santa Rosa Sonoma County (STS) if they book a flight from Santa Rosa to Illinois. Santa Rosa Sonoma County is conveniently located just 7.2 mi from Santa Rosa’s city center.

  • What are the most popular routes from Santa Rosa to Illinois?

    When deciding which route to take from Santa Rosa to Illinois consider Santa Rosa Sonoma County - Chicago O'Hare Intl, Santa Rosa Sonoma County - Lambert-St Louis or Santa Rosa Sonoma County - Moline Quad-City as they are the most popular.

  • Can I find deals for flights from Santa Rosa to Illinois that include hotel bookings?

    Yes. In addition to deals on Santa Rosa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Santa Rosa to Illinois?

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

  • Can I find deals for business class flights from Santa Rosa to Illinois?

    Yes. Cheapflights offers flight deals from Santa Rosa 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 Santa Rosa to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $245). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $323). 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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Top 2 airlines flying from Santa Rosa to Illinois

Discover the top 2 airlines that operate flights from Santa Rosa 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$333Average$637FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$336Average$667FlexibilityNo cancel feeOn-time71%
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