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Santa Rosa

$126+ 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
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This lol.travel 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:59 pmORD - STS
1 stop27h 55mAlaska Airlines
Tue 12/168:00 amSTS - ORD
1 stop9h 54mAlaska Airlines
Deal found 10/28$269
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 12/103:05 pmORD - STS
1 stop9h 49mAlaska Airlines
Sat 12/136:58 pmSTS - ORD
1 stop26h 52mAlaska Airlines
Deal found 10/28$270
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.
Tue 11/182:54 pmORD - STS
1 stop11h 03mAlaska Airlines
Wed 12/36:43 pmSTS - ORD
1 stop27h 07mAlaska Airlines
Deal found 10/28$272
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.
Wed 11/199:20 amORD - STS
1 stop16h 37mAlaska Airlines
Tue 12/168:00 amSTS - ORD
1 stop28h 09mAlaska Airlines
Deal found 10/29$275
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.
Tue 11/189:20 amORD - STS
1 stop8h 42mAlaska Airlines
Thu 12/46:43 pmSTS - ORD
1 stop27h 07mAlaska Airlines
Deal found 10/28$287
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.
Wed 11/199:20 amORD - STS
1 stop16h 37mAlaska Airlines
Wed 12/178:00 amSTS - ORD
1 stop13h 50mAlaska Airlines
Deal found 10/29$290
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.
Thu 12/118:59 pmORD - STS
1 stop27h 55mAlaska Airlines
Sat 12/136:58 pmSTS - ORD
1 stop26h 52mAlaska Airlines
Deal found 10/28$297
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.
Wed 11/199:20 amORD - STS
1 stop16h 37mAlaska Airlines
Thu 12/186:45 amSTS - ORD
1 stop15h 14mAlaska Airlines
Deal found 10/29$302
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.
Thu 11/209:20 amORD - STS
1 stop8h 42mAlaska Airlines
Tue 12/168:00 amSTS - ORD
1 stop9h 54mAlaska Airlines
Deal found 10/29$305
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.
Tue 11/189:20 amORD - STS
1 stop8h 42mAlaska Airlines
Fri 12/52:21 pmSTS - ORD
1 stop30h 09mAlaska Airlines
Deal found 10/28$312
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 12/257:00 amSTL - STS
1 stop8h 32mAlaska Airlines
Wed 12/316:00 amSTS - STL
1 stop8h 26mAlaska Airlines
Deal found 10/30$500
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.
Sat 11/157:00 amSTL - STS
2 stops16h 46mAlaska Airlines
Wed 11/194:51 pmSTS - STL
2 stops29h 08mAlaska Airlines
Deal found 10/30$613

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$269
(lol.travel)

One-way from

$126
(Kiwi.com)

Popular in

December

Cheapest in

July

Average price

$321
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. 10% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 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 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 October 30, 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 11/18

2:54 pm-11:57 pm

1 stop11h 03m

Santa Rosa Sonoma County

Wed 12/3

6:43 pm-11:50 pm

1 stop27h 07m

$272

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Mon 3/2

2:59 pm-11:07 am

1 stop22h 08m

Santa Rosa Sonoma County

Fri 3/6

6:58 am-1:59 pm

1 stop29h 01m

$287

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 12/11

8:59 pm-10:54 pm

1 stop27h 55m

Santa Rosa Sonoma County

Sat 12/13

6:58 pm-11:50 pm

1 stop26h 52m

$297

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 12/12

3:05 pm-10:54 pm

1 stop9h 49m

Santa Rosa Sonoma County

Sat 12/13

6:58 pm-2:09 pm

1 stop17h 11m

$297

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 12/10

8:55 am-10:54 pm

1 stop15h 59m

Santa Rosa Sonoma County

Sun 12/14

8:00 am-11:50 pm

1 stop13h 50m

$305

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 11/20

9:20 am-4:02 pm

1 stop8h 42m

Santa Rosa Sonoma County

Tue 12/16

8:00 am-2:09 pm

1 stop28h 09m

$305

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 11/19

9:20 am-11:57 pm

1 stop16h 37m

Santa Rosa Sonoma County

Thu 12/18

7:00 am-8:02 pm

2 stops11h 02m

$308

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 11/19

9:20 am-11:57 pm

1 stop16h 37m

Santa Rosa Sonoma County

Sat 12/20

7:00 am-11:59 pm

2 stops14h 59m

$323

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 12/5

3:05 pm-2:36 pm

1 stop25h 31m

Santa Rosa Sonoma County

Sun 12/7

8:00 am-11:50 pm

1 stop13h 50m

$332

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 11/20

9:20 am-4:02 pm

1 stop8h 42m

Santa Rosa Sonoma County

Thu 12/18

6:45 am-11:59 pm

1 stop15h 14m

$332

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 24 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 June is currently the most expensive (average of $198). 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 October 30, 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 11h 03m. Fly via Alaska Airlines to get the fastest option. There are 1842 mi between Illinois and Santa Rosa.

  • What are the cheapest airlines to fly from Illinois to Santa Rosa one-way?

    The cheapest airlines for a one-way flight from Illinois to Santa Rosa are Hawaiian Airlines ($126), Alaska Airlines ($129), and American Airlines ($435).

  • 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 $198). 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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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$384Average$743FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$444Average$547FlexibilityNo cancel feeOn-time85%

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