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Santa Rosa

$128+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STS
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$255
(Alaska Airlines)

One-way from

$128
(Alaska Airlines)

Popular in

December

Cheapest in

July

Average price

$287
From Illinois to Santa Rosa Sonoma County
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One-way flight from Illinois to Santa Rosa Sonoma County
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Highest demand for flights based on searches. 7% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 9/10. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:00 amORD - STS
1 stop9h 36mHawaiian Airlines
Tue 10/282:09 pmSTS - ORD
1 stop7h 50mHawaiian Airlines
Deal found 9/10$260
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/223:50 pmORD - STS
1 stop9h 26mAlaska Airlines
Tue 10/286:49 amSTS - ORD
2 stops12h 51mAlaska Airlines
Deal found 9/10$266
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 12/38:00 amORD - STS
1 stop15h 52mAlaska Airlines
Wed 12/107:50 amSTS - ORD
2 stops12h 40mAlaska Airlines
Deal found 9/9$270
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 12/68:00 amORD - STS
2 stops13h 15mAlaska Airlines
Sat 12/137:50 amSTS - ORD
2 stops12h 40mAlaska Airlines
Deal found 9/9$273
This Alaska Airlines deal was found by Cheapflights users on 9/8. 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 10/183:50 pmORD - STS
1 stop9h 26mAlaska Airlines
Tue 10/282:09 pmSTS - ORD
1 stop7h 50mAlaska Airlines
Deal found 9/8$277
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 12/68:00 amORD - STS
2 stops13h 15mAlaska Airlines
Wed 12/312:24 pmSTS - ORD
1 stop7h 35mAlaska Airlines
Deal found 9/9$279
This Alaska Airlines deal was found by Cheapflights users on 9/8. 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 11/129:20 amORD - STS
1 stop8h 42mAlaska Airlines
Sat 11/1510:50 amSTS - ORD
2 stops11h 09mAlaska Airlines
Deal found 9/8$285
This Hawaiian Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 11/82:05 pmORD - STS
1 stop7h 22mHawaiian Airlines
Sat 11/152:22 pmSTS - ORD
1 stop8h 02mHawaiian Airlines
Deal found 9/9$286
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 10/43:50 pmORD - STS
1 stop9h 26mAlaska Airlines
Tue 10/79:43 amSTS - ORD
2 stops12h 16mAlaska Airlines
Deal found 9/10$289
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:00 amORD - STS
2 stops13h 15mAlaska Airlines
Mon 12/86:43 pmSTS - ORD
1 stop17h 26mAlaska Airlines
Deal found 9/11$295
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 12/169:15 amORD - STS
1 stop7h 21mAlaska Airlines
Sat 1/108:00 amSTS - ORD
2 stops13h 59mAlaska Airlines
Deal found 9/9$296
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 10/33:35 pmSTL - STS
2 stops19h 31mAlaska Airlines
Sat 10/112:30 pmSTS - STL
1 stop7h 33mAlaska Airlines
Deal found 9/10$391

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 September 11, 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

Tue 2/24

10:00 am-10:35 pm

2 stops14h 35m

Santa Rosa Sonoma County

Wed 3/4

8:00 am-5:04 am

2 stops19h 04m

$255

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 2/27

2:59 pm-10:46 pm

1 stop9h 47m

Santa Rosa Sonoma County

Wed 3/4

8:00 am-11:59 pm

2 stops13h 59m

$266

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 2/24

2:59 pm-10:46 pm

1 stop9h 47m

Santa Rosa Sonoma County

Tue 3/3

8:00 am-11:59 pm

2 stops13h 59m

$266

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 10/22

3:50 pm-11:16 pm

1 stop9h 26m

Santa Rosa Sonoma County

Tue 10/28

6:49 am-9:40 pm

2 stops12h 51m

$266

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 2/26

2:59 pm-10:46 pm

1 stop9h 47m

Santa Rosa Sonoma County

Sat 2/28

11:55 am-11:59 pm

2 stops10h 04m

$275

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 2/25

7:45 am-7:07 pm

2 stops13h 22m

Santa Rosa Sonoma County

Mon 3/2

6:15 pm-1:04 pm

2 stops16h 49m

$275

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sat 2/21

2:59 pm-10:46 pm

1 stop9h 47m

Santa Rosa Sonoma County

Sat 2/28

11:55 am-11:59 pm

2 stops10h 04m

$275

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 11/12

9:20 am-4:02 pm

1 stop8h 42m

Santa Rosa Sonoma County

Sat 11/15

10:50 am-11:59 pm

2 stops11h 09m

$285

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sat 10/18

3:50 pm-11:16 pm

1 stop9h 26m

Santa Rosa Sonoma County

Tue 10/28

10:50 am-11:59 pm

2 stops11h 09m

$285

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 2/26

2:59 pm-10:46 pm

1 stop9h 47m

Santa Rosa Sonoma County

Mon 3/2

6:15 pm-11:59 pm

2 stops27h 44m

$286

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 33 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 $202). Flying from Illinois to Santa Rosa in June is currently the most expensive (average of $395). 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 September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Santa Rosa as you normally would.

How much does it cost to fly round-trip from Illinois to Santa Rosa?

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 14h 35m. 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 $202). Flying from Illinois to Santa Rosa in June is currently the most expensive (average of $395). 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 airline flying from Illinois to Santa Rosa

Discover the top airline 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$384Average$743FlexibilityNo cancel feeOn-time71%

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