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$153+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$272
(Alaska Airlines)

One-way from

$153
(Hawaiian Airlines)

Popular in

December

Cheapest in

February

Average price

$357
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 ($20 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 July 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 July 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 10/219:43 amSTS - ORD
2 stops12h 16mAlaska Airlines
Wed 11/59:20 amORD - STS
1 stop7h 04mAlaska Airlines
Deal found 7/29$272
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 10/17:00 amSTS - STL
1 stop8h 34mHawaiian Airlines
Wed 10/83:57 pmSTL - STS
1 stop8h 09mHawaiian Airlines
Deal found 7/29$318
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 10/17:52 pmSTS - STL
2 stops19h 42mAlaska Airlines
Wed 10/83:57 pmSTL - STS
1 stop8h 09mAlaska Airlines
Deal found 7/29$356
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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.
Thu 9/255:55 pmSTS - ORD
1 stop9h 05mHawaiian Airlines
Mon 9/298:00 amORD - STS
1 stop7h 36mHawaiian Airlines
Deal found 7/29$382
This American Airlines deal was found by Cheapflights users on 7/29. 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 10/284:17 pmSTS - MLI
2 stops22h 10mAmerican Airlines
Sat 11/15:34 pmMLI - STS
2 stops25h 19mAmerican Airlines
Deal found 7/29$739
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1412:17 pmSTS - STL
1 stop6h 06mAmerican Airlines
Mon 8/185:15 amSTL - STS
1 stop8h 21mAmerican Airlines
Deal found 7/30$759

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 July 30, 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

Tue 10/21

9:43 am-11:59 pm

2 stops12h 16m

Chicago O'Hare Intl

Wed 11/5

9:20 am-2:24 pm

1 stop7h 04m

$272

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 10/1

7:00 am-5:34 pm

1 stop8h 34m

Lambert-St Louis

Wed 10/8

3:57 pm-10:06 pm

1 stop8h 09m

$318

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 10/1

7:52 pm-5:34 pm

2 stops19h 42m

Lambert-St Louis

Wed 10/8

3:57 pm-10:06 pm

1 stop8h 09m

$356

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Thu 9/25

5:55 pm-5:00 am

1 stop9h 05m

Chicago O'Hare Intl

Mon 9/29

8:00 am-1:36 pm

1 stop7h 36m

$382

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Tue 10/28

4:17 pm-4:27 pm

2 stops22h 10m

Moline Quad-City

Sat 11/1

5:34 pm-4:53 pm

2 stops25h 19m

$739

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Thu 8/14

12:17 pm-8:23 pm

1 stop6h 06m

Lambert-St Louis

Mon 8/18

5:15 am-11:36 am

1 stop8h 21m

$759

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 8/26

2:33 pm-11:59 pm

1 stop7h 26m

$153

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 11/4

7:46 pm-11:59 pm

1 stop26h 13m

$158

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Sat 10/4

2:30 pm-12:03 am

1 stop7h 33m

$159

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Fri 10/3

2:28 pm-11:59 pm

1 stop7h 31m

$173

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 12 results
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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 $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 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 July 30, 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.

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 July 30, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Hawaiian Airlines, and American Airlines from Santa Rosa to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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 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 cheapest airlines to fly from Santa Rosa to Illinois one-way?

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $153. Alaska Airlines flights start at $158 while deals on American Airlines start at $245 one-way.

  • 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 $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.

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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$308Average$582FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$318Average$578FlexibilityNo cancel feeOn-time71%

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