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Santa Rosa

$149+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STS
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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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 December 18, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/17. 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 12/258:39 amORD - STS
1 stop8h 05mAlaska Airlines
Thu 1/18:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/17$624
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 12/216:00 amORD - STS
1 stop9h 32mAlaska Airlines
Thu 12/258:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/16$668
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 12/258:39 amORD - STS
1 stop8h 05mAlaska Airlines
Sun 1/48:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/15$702
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 12/223:37 pmORD - STS
1 stop10h 22mAlaska Airlines
Thu 1/18:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/16$703
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 12/168:00 amORD - STS
2 stops15h 42mAlaska Airlines
Wed 12/247:00 amSTS - ORD
2 stops11h 02mAlaska Airlines
Deal found 12/15$725
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 12/255:26 pmSTL - STS
1 stop22h 06mAlaska Airlines
Wed 12/318:17 pmSTS - STL
2 stops25h 34mAlaska Airlines
Deal found 12/16$753
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 12/258:39 amORD - STS
1 stop8h 05mAlaska Airlines
Fri 1/28:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/15$753
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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 12/246:00 amORD - STS
2 stops15h 02mAlaska Airlines
Thu 1/18:17 pmSTS - ORD
1 stop6h 45mAlaska Airlines
Deal found 12/17$776
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 12/233:37 pmORD - STS
1 stop10h 22mAlaska Airlines
Sat 1/36:00 amSTS - ORD
1 stop28h 13mAlaska Airlines
Deal found 12/16$786

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$286
(Alaska Airlines)

One-way from

$149
(Alaska Airlines)

Popular in

December

Cheapest in

July

Average price

$449
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. 15% potential increase in price ($59 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Mon 1/26

6:06 pm-12:22 pm

2 stops20h 16m

Santa Rosa Sonoma County

Wed 1/28

2:30 pm-11:37 pm

1 stop7h 07m

$286

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Mon 2/2

8:00 am-12:22 pm

2 stops30h 22m

Santa Rosa Sonoma County

Tue 2/3

2:30 pm-11:37 pm

1 stop7h 07m

$286

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Mon 1/26

3:44 pm-11:11 pm

1 stop9h 27m

Santa Rosa Sonoma County

Tue 1/27

2:30 pm-11:37 pm

1 stop7h 07m

$289

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 1/8

3:44 pm-11:11 pm

1 stop9h 27m

Santa Rosa Sonoma County

Mon 1/12

6:52 pm-2:29 pm

1 stop17h 37m

$290

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 1/22

3:44 pm-11:11 pm

1 stop9h 27m

Santa Rosa Sonoma County

Mon 1/26

6:52 pm-2:29 pm

1 stop17h 37m

$290

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 1/13

8:00 am-12:22 pm

2 stops30h 22m

Santa Rosa Sonoma County

Tue 1/20

6:50 am-2:38 pm

2 stops29h 48m

$293

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 1/20

8:00 am-12:22 pm

2 stops30h 22m

Santa Rosa Sonoma County

Tue 1/27

6:50 am-5:10 pm

2 stops8h 20m

$293

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 2/3

6:06 pm-12:22 pm

2 stops20h 16m

Santa Rosa Sonoma County

Thu 2/5

6:50 am-11:50 pm

2 stops15h 00m

$293

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 1/6

6:00 am-7:02 pm

2 stops15h 02m

Santa Rosa Sonoma County

Sat 1/17

11:05 am-2:29 pm

2 stops25h 24m

$293

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 1/8

3:44 pm-11:11 pm

1 stop9h 27m

Santa Rosa Sonoma County

Sat 1/17

11:05 am-2:29 pm

2 stops25h 24m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 27 results
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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 December is currently the most expensive (average of $197). 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 IL to STS?

Find hourly flight availability from Illinois to Santa Rosa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

It’s optimal to fly from Illinois to Santa Rosa at noon. By choosing this option you can save up to 59% on the cost of your flight, compared to a flight in the morning.

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 20h 16m. 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 December is currently the most expensive (average of $197). 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

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Alternative routes for Illinois to Santa Rosa

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$384Average$783FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$444Average$547FlexibilityNo cancel feeOn-time85%

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