HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$162+ 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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Santa Rosa to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Sat 11/227:00 pmSTS - ORD
1 stop8h 01mAlaska Airlines
Tue 12/28:59 pmORD - STS
1 stop19h 37mAlaska Airlines
Deal found 10/29$315
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Sun 11/236:35 amSTS - ORD
1 stop14h 57mAlaska Airlines
Tue 12/28:59 pmORD - STS
1 stop19h 37mAlaska Airlines
Deal found 10/29$332
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:42 pmSTS - ORD
1 stop16h 55mAlaska Airlines
Sun 1/48:58 pmORD - STS
1 stop16h 25mAlaska Airlines
Deal found 10/30$342
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 11/187:46 pmSTS - ORD
1 stop16h 08mAlaska Airlines
Tue 12/28:59 pmORD - STS
1 stop19h 37mAlaska Airlines
Deal found 10/29$350
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Mon 11/246:35 amSTS - ORD
1 stop14h 57mAlaska Airlines
Tue 12/28:59 pmORD - STS
1 stop19h 37mAlaska Airlines
Deal found 10/29$352
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/253:53 pmSTS - ORD
2 stops11h 09mAlaska Airlines
Wed 12/313:37 pmORD - STS
1 stop21h 46mAlaska Airlines
Deal found 10/30$353
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:42 pmSTS - ORD
1 stop16h 55mAlaska Airlines
Fri 1/28:58 pmORD - STS
1 stop29h 01mAlaska Airlines
Deal found 10/30$362
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/253:53 pmSTS - ORD
2 stops11h 09mAlaska Airlines
Sat 1/33:37 pmORD - STS
1 stop10h 22mAlaska Airlines
Deal found 10/30$363
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Wed 12/313:37 pmORD - STS
1 stop21h 46mAlaska Airlines
Deal found 10/30$367
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/233:53 pmSTS - ORD
2 stops11h 10mAlaska Airlines
Wed 12/313:37 pmORD - STS
1 stop21h 46mAlaska Airlines
Deal found 10/30$373
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Sat 1/38:39 amORD - STS
1 stop17h 20mAlaska Airlines
Deal found 10/30$377
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 11/1210:50 amSTS - STL
2 stops35h 09mAlaska Airlines
Sun 11/167:00 amSTL - STS
1 stop8h 26mAlaska Airlines
Deal found 10/28$665

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$287
(Alaska Airlines)

One-way from

$162
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$389
Provider with most accurate pricing for San Francisco-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Chicago (CHI) flights.
Search Deals
From Santa Rosa Sonoma County to Illinois
Search Deals
One-way flight from Santa Rosa Sonoma County to Illinois
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 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

Mon 3/9

6:58 am-11:10 pm

1 stop14h 12m

Chicago O'Hare Intl

Tue 3/10

2:59 pm-10:46 pm

1 stop9h 47m

$287

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Sat 11/22

7:00 pm-5:01 am

1 stop8h 01m

Chicago O'Hare Intl

Tue 12/2

8:59 pm-2:36 pm

1 stop19h 37m

$315

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 11/18

7:46 pm-1:54 pm

1 stop16h 08m

Chicago O'Hare Intl

Tue 12/2

8:59 pm-2:36 pm

1 stop19h 37m

$350

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Sun 12/21

8:17 pm-5:02 am

1 stop6h 45m

Chicago O'Hare Intl

Wed 12/31

3:37 pm-11:23 am

1 stop21h 46m

$367

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Tue 4/14

7:00 am-11:55 pm

2 stops14h 55m

Lambert-St Louis

Wed 4/15

2:55 pm-9:51 pm

1 stop8h 56m

$485

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Tue 4/14

12:46 pm-11:47 pm

1 stop9h 01m

Lambert-St Louis

Wed 4/15

8:12 am-3:47 pm

1 stop9h 35m

$629

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 11/12

10:50 am-11:59 pm

2 stops35h 09m

Lambert-St Louis

Sun 11/16

7:00 am-1:26 pm

1 stop8h 26m

$665

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 11/12

2:10 pm-11:51 pm

1 stop7h 41m

Lambert-St Louis

Sun 11/16

7:21 am-12:48 pm

1 stop7h 27m

$719

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Sat 11/15

1:18 pm-11:03 pm

1 stop7h 45m

Moline Quad-City

Tue 11/18

5:46 am-12:07 pm

1 stop8h 21m

$771

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Sat 11/15

8:03 pm-9:20 am

2 stops11h 17m

Moline Quad-City

Tue 11/18

9:50 am-7:27 pm

2 stops11h 37m

$871

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 17 results
1
2

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, April is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $126). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $207). 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 October 30, 2025.

When flying from Santa Rosa to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 28% versus a flight in the morning.

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 October 30, 2025.
Peruse reviews from past customers who have flown with Alaska 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
11,214 reviews

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,214 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,030 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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.

  • How long is the flight from Santa Rosa to Illinois?

    Airlines like Alaska Airlines and American Airlines fly from Santa Rosa to Illinois in about 7h 45m. The time it takes to get you to your destination can typically vary by up to 6h 27m. The distance from Santa Rosa to Illinois is about 1711 mi. This flight may include one or multiple stops.

  • 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, April is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $126). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $207). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Santa Rosa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Newark flights
San Francisco to Los Angeles flights
San Francisco to Newark flights
Los Angeles to San Francisco flights
Los Angeles to Seattle flights
Los Angeles to Honolulu flights
Los Angeles to LaGuardia flights
San Francisco to Las Vegas flights
San Francisco to Ontario flights
San Francisco to Honolulu flights
San Francisco to Dallas/Fort Worth flights
San Francisco to Seattle flights
San Francisco to LaGuardia flights
Los Angeles to Miami flights
San Francisco to Santa Ana flights
Los Angeles to Las Vegas flights
Los Angeles to Orlando flights
Los Angeles to O'Hare Intl flights
Santa Ana to Seattle flights
Santa Ana to San Francisco flights
Los Angeles to Fort Lauderdale flights
Ontario to Dallas/Fort Worth flights
Ontario to Seattle flights
San Jose to Los Angeles flights
San Francisco to O'Hare Intl flights
Los Angeles to Boston flights
Burbank to Las Vegas flights
San Diego to John F Kennedy Intl flights
San Jose to Las Vegas flights
Ontario to San Francisco flights
Los Angeles to Sacramento flights
Los Angeles to Portland flights
Los Angeles to Reagan-National flights
Ontario to Las Vegas flights
Santa Ana to Las Vegas flights
Los Angeles to Sky Harbor Intl flights
Santa Ana to Dallas/Fort Worth flights
Los Angeles to Dulles Intl flights
San Francisco to Kahului flights
San Francisco to Miami flights
Los Angeles to Denver flights
Los Angeles to Atlanta flights
Los Angeles to Hobby flights
Ontario to John F Kennedy Intl flights
Los Angeles to San Jose flights
San Diego to Seattle flights
Sacramento to Los Angeles flights

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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$292Average$506FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$316Average$653FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.