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$178+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$275
(Alaska Airlines)

One-way from

$178
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$354
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. 6% potential increase in price ($21 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 June 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 junio 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
mié. 9/247:00 amSTS - ORD
1 stop13h 04mAlaska Airlines
mar. 9/301:01 pmORD - STS
1 stop9h 07mAlaska Airlines
Deal found 6/10$275
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
mié. 10/17:00 amSTS - STL
1 stop8h 34mAlaska Airlines
mié. 10/86:33 amSTL - STS
1 stop9h 01mAlaska Airlines
Deal found 6/10$318
This Trip.com deal was found by Cheapflights users on 6/12. 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.
dom. 7/277:00 amSTS - ORD
2 stops21h 03mMultiple Airlines
dom. 8/36:40 amORD - STS
1 stop19h 04mMultiple Airlines
Deal found 6/12$421
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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.
lun. 7/288:01 pmSTS - ORD
1 stop7h 39mHawaiian Airlines
vie. 8/12:03 pmORD - STS
1 stop7h 40mHawaiian Airlines
Deal found 6/11$509
This Trip.com deal was found by Cheapflights users on 6/11. 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.
lun. 7/287:00 amSTS - STL
2 stops14h 59mMultiple Airlines
lun. 8/47:32 pmSTL - STS
1 stop19h 53mMultiple Airlines
Deal found 6/11$549
This American Airlines deal was found by Cheapflights users on 6/11. 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.
mar. 7/11:10 pmSTS - ORD
1 stop7h 21mAmerican Airlines
sáb. 7/55:00 amORD - STS
2 stops12h 36mAmerican Airlines
Deal found 6/11$585
This American Airlines deal was found by Cheapflights users on 6/10. 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.
jue. 7/1012:20 pmSTS - MLI
1 stop8h 56mAmerican Airlines
jue. 7/177:00 amMLI - STS
2 stops10h 36mAmerican Airlines
Deal found 6/10$616
This American Airlines deal was found by Cheapflights users on 6/11. 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.
jue. 6/191:10 pmSTS - STL
1 stop8h 49mAmerican Airlines
dom. 6/225:37 amSTL - STS
1 stop8h 08mAmerican Airlines
Deal found 6/11$899

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 junio 12, 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

mié. 9/24

7:00 am-10:04 pm

1 stop13h 04m

Chicago O'Hare Intl

mar. 9/30

1:01 pm-8:08 pm

1 stop9h 07m

$275

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

mié. 10/1

7:00 am-5:34 pm

1 stop8h 34m

Lambert-St Louis

mié. 10/8

6:33 am-1:34 pm

1 stop9h 01m

$318

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

mié. 10/1

7:00 am-5:34 pm

1 stop8h 34m

Lambert-St Louis

mié. 10/8

3:57 pm-6:11 pm

2 stops28h 14m

$356

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

dom. 7/27

7:00 am-6:03 am

2 stops21h 03m

Chicago O'Hare Intl

dom. 8/3

6:40 am-11:44 pm

1 stop19h 04m

$421

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

lun. 7/28

8:01 pm-5:40 am

1 stop7h 39m

Chicago O'Hare Intl

vie. 8/1

2:03 pm-7:43 pm

1 stop7h 40m

$509

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

lun. 7/28

7:00 am-11:59 pm

2 stops14h 59m

Lambert-St Louis

lun. 8/4

7:32 pm-1:25 pm

1 stop19h 53m

$549

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

mar. 7/1

1:10 pm-10:31 pm

1 stop7h 21m

Chicago O'Hare Intl

sáb. 7/5

5:00 am-3:36 pm

2 stops12h 36m

$585

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

jue. 7/10

12:20 pm-11:16 pm

1 stop8h 56m

Moline Quad-City

jue. 7/17

7:00 am-3:36 pm

2 stops10h 36m

$616

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

mar. 7/15

12:20 pm-10:57 pm

1 stop8h 37m

Lambert-St Louis

vie. 7/18

7:44 am-12:31 pm

1 stop6h 47m

$1,649

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

sáb. 8/23

2:28 pm-11:59 pm

1 stop7h 31m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 11 results
1
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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 junio 12, 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 junio 12, 2025.
Read through reviews of airlines operating flights from Santa Rosa to Illinois, such as Alaska Airlines, Hawaiian 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
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

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
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

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 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.

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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$318Average$568FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$361Average$629FlexibilityNo cancel feeOn-time75%

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