HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Santa Rosa

$119+ Cheap flights from Illinois to Santa Rosa (STS)

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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Santa Rosa 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.

Cheap flight deals from Illinois to Santa Rosa

Cheapest flights from Illinois to Santa Rosa
Explore the most affordable flight options available from Illinois to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/56:00 am
ORD
-
STS
1 stop8h 21m
Alaska Airlines
Tue 5/127:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/28$247
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/56:00 am
ORD
-
STS
1 stop8h 21m
Alaska Airlines
Tue 5/57:46 pm
STS
-
ORD
1 stop8h 54m
Alaska Airlines
Deal found 1/28$257
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Sat 5/28:50 am
ORD
-
STS
1 stop12h 16m
Alaska Airlines
Sat 5/97:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/28$260
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Fri 5/17:59 pm
ORD
-
STS
1 stop16h 59m
Alaska Airlines
Tue 5/57:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/28$270
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Sat 5/26:00 am
ORD
-
STS
1 stop8h 21m
Alaska Airlines
Tue 5/127:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/28$276
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/56:00 am
ORD
-
STS
1 stop8h 21m
Alaska Airlines
Thu 5/77:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/28$280
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/133:43 pm
ORD
-
STS
1 stop9h 43m
Alaska Airlines
Tue 5/197:00 am
STS
-
ORD
1 stop9h 46m
Alaska Airlines
Deal found 1/28$283
This Expedia deal was found by Cheapflights users on 1/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/172:07 pm
ORD
-
STS
1 stop21h 07m
Alaska Airlines
Tue 2/248:00 am
STS
-
ORD
1 stop27h 11m
Alaska Airlines
Deal found 1/27$286
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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.
Thu 4/237:59 pm
ORD
-
STS
1 stop29h 28m
Alaska Airlines
Sat 4/257:23 am
STS
-
ORD
1 stop9h 40m
Alaska Airlines
Deal found 1/27$290
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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.
Thu 5/73:52 pm
ORD
-
STS
1 stop9h 35m
Alaska Airlines
Tue 5/197:00 am
STS
-
ORD
1 stop9h 46m
Alaska Airlines
Deal found 1/28$293
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/126:00 am
ORD
-
STS
1 stop8h 21m
Alaska Airlines
Sat 5/167:00 am
STS
-
ORD
1 stop14h 41m
Alaska Airlines
Deal found 1/28$299
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 2/247:00 am
STL
-
STS
1 stop16h 52m
Alaska Airlines
Sat 2/287:57 pm
STS
-
STL
1 stop16h 26m
Alaska Airlines
Deal found 1/28$393

Find flight deals from Illinois to Santa Rosa

Keep the following information in mind while searching for Illinois to Santa Rosa flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$247
(Alaska Airlines)

One-way from

$119
(Alaska Airlines)

Popular in

December

Cheapest in

July

Average price

$405
Provider with most accurate pricing for Chicago (CHI)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-San Francisco flights.
Search Deals
From Illinois to Santa Rosa Sonoma County
Search Deals
One-way flight from Illinois to Santa Rosa Sonoma County
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($77 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 January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Santa Rosa 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 January 29, 2026.
Use the filters below to find and compare flights from Illinois to Santa Rosa that are best for you.

Fly from

Illinois

Fly to

Santa Rosa

Route

Depart

Return

Price

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 2/17

2:07 pm-9:14 am

1 stop21h 07m

Santa Rosa Sonoma County

Tue 2/24

8:00 am-1:11 pm

1 stop27h 11m

$286

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 4/24

7:59 pm-10:58 am

1 stop16h 59m

Santa Rosa Sonoma County

Mon 4/27

8:00 pm-1:13 pm

1 stop15h 13m

$313

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 2/19

3:54 pm-11:50 pm

1 stop9h 56m

Santa Rosa Sonoma County

Mon 2/23

6:37 pm-2:58 pm

1 stop18h 21m

$319

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sat 2/28

3:54 pm-9:52 pm

1 stop7h 58m

Santa Rosa Sonoma County

Wed 3/4

8:00 am-11:56 pm

2 stops13h 56m

$324

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 2/20

2:07 pm-9:14 am

1 stop21h 07m

Santa Rosa Sonoma County

Mon 3/2

6:37 pm-11:59 pm

1 stop27h 22m

$329

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 4/23

6:00 am-11:01 pm

2 stops19h 01m

Santa Rosa Sonoma County

Sat 4/25

7:23 am-7:03 pm

1 stop9h 40m

$330

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 4/2

4:13 pm-11:13 pm

1 stop9h 00m

Santa Rosa Sonoma County

Wed 4/8

7:05 am-11:59 pm

2 stops14h 54m

$378

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 3/31

4:13 pm-10:03 am

1 stop19h 50m

Santa Rosa Sonoma County

Wed 4/1

6:53 pm-6:39 am

1 stop9h 46m

$381

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 2/24

7:00 am-10:32 am

1 stop29h 32m

Santa Rosa Sonoma County

Sat 2/28

7:57 pm-2:23 pm

1 stop16h 26m

$393

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Wed 6/3

6:20 pm-11:30 pm

1 stop7h 10m

Santa Rosa Sonoma County

Mon 6/8

7:02 pm-5:06 pm

1 stop20h 04m

$479

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 24 results
1
2
3

Best time to book a flight from Illinois to Santa Rosa

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

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

Currently, February is the cheapest month in which you can book a flight from Illinois to Santa Rosa (average of $130). Flying from Illinois to Santa Rosa in June is currently the most expensive (average of $196). 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.

Related info for your journey

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

    Located just 7.2 mi from the city center, Santa Rosa Sonoma County (STS) is the airport most travelers will use when flying to Santa Rosa from Illinois.

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

    There are many flights that can get you from Illinois to Santa Rosa in 21h 07m. Fly via Alaska Airlines to get the fastest option. There are 1842 mi between Illinois and Santa Rosa.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Illinois to Santa Rosa (average of $130). Flying from Illinois to Santa Rosa in June is currently the most expensive (average of $196). 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

Traveling to a place near Santa Rosa?

Book flights to Santa Rosa if you plan to visit one of these locations
Fort Bragg
Ukiah

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 Illinois to Santa Rosa

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

Top 2 airlines flying from Illinois to Santa Rosa

Discover the top 2 airlines that operate flights from Illinois to Santa Rosa. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$444Average$547FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$511Average$788FlexibilityNo 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.