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Santa Rosa

$137+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STS
Jun 18 — Jun 251
Wed 6/18
Wed 6/25
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 June 13, 2025.

Round-trip from

$275
(Alaska Airlines)

One-way from

$137
(Alaska Airlines)

Popular in

December

Cheapest in

September

Average price

$326
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. 8% potential increase in price ($28 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 June 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 June 13, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/11. 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.
Wed 10/226:00 amORD - STS
1 stop9h 34mAlaska Airlines
Wed 10/297:00 amSTS - ORD
1 stop12h 39mAlaska Airlines
Deal found 6/11$275
This Hawaiian Airlines deal was found by Cheapflights users on 6/10. 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.
Sun 11/96:00 amORD - STS
1 stop9h 37mHawaiian Airlines
Fri 11/142:29 pmSTS - ORD
1 stop7h 30mHawaiian Airlines
Deal found 6/10$362
This eDestinos deal was found by Cheapflights users on 6/10. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/259:56 pmORD - STS
1 stop18h 29mMultiple Airlines
Fri 8/110:00 amSTS - ORD
1 stop9h 06mMultiple Airlines
Deal found 6/10$418
This Alaska Airlines deal was found by Cheapflights users on 6/12. 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 8/17:32 pmSTL - STS
1 stop25h 35mAlaska Airlines
Mon 8/48:01 pmSTS - STL
1 stop25h 58mAlaska Airlines
Deal found 6/12$485
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/287:01 pmORD - STS
2 stops22h 36mAmerican Airlines
Sat 7/51:01 pmSTS - ORD
1 stop9h 47mAmerican Airlines
Deal found 6/10$577
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/167:03 amSTL - STS
1 stop6h 37mAmerican Airlines
Sun 7/204:16 pmSTS - STL
1 stop6h 12mAmerican Airlines
Deal found 6/12$609

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 June 13, 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

Wed 10/22

6:00 am-1:34 pm

1 stop9h 34m

Santa Rosa Sonoma County

Wed 10/29

7:00 am-9:39 pm

1 stop12h 39m

$275

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sun 11/9

6:00 am-1:37 pm

1 stop9h 37m

Santa Rosa Sonoma County

Fri 11/14

2:29 pm-11:59 pm

1 stop7h 30m

$362

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 7/25

9:56 pm-2:25 pm

1 stop18h 29m

Santa Rosa Sonoma County

Fri 8/1

10:00 am-9:06 pm

1 stop9h 06m

$418

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Fri 8/1

7:32 pm-7:07 pm

1 stop25h 35m

Santa Rosa Sonoma County

Mon 8/4

8:01 pm-11:59 pm

1 stop25h 58m

$485

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sat 6/28

7:01 pm-3:37 pm

2 stops22h 36m

Santa Rosa Sonoma County

Sat 7/5

1:01 pm-12:48 am

1 stop9h 47m

$577

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Wed 7/16

7:03 am-11:40 am

1 stop6h 37m

Santa Rosa Sonoma County

Sun 7/20

4:16 pm-12:28 am

1 stop6h 12m

$609

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 10/29

8:00 am-1:37 pm

1 stop7h 37m

$137

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 10/21

6:33 am-1:34 pm

1 stop9h 01m

$159

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Mon 6/30

7:35 am-12:40 pm

1 stop7h 05m

$290

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Wed 6/25

6:41 am-1:25 pm

1 stop8h 44m

$379

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 11 results
1
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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 June 13, 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.

Rainfall in Santa Rosa by month

Plan your trip to Santa Rosa by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Santa Rosa ranges from 0.0 - 7.1 inches per month. January is typically the wettest month, when rainfall can reach 7.1 in. July is typically the driest time to visit Santa Rosa when rainfall is around 0.0 in.

Temperature in Santa Rosa by month

Plan your trip to Santa Rosa by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Santa Rosa, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 46.4 F).

Reviews of airlines servicing Santa Rosa

Get insights into the airlines that provide service to Santa Rosa. 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 Santa Rosa. Reviews last updated June 13, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Hawaiian Airlines and American Airlines from Illinois to Santa Rosa to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 Alaska Airlines ($137), American Airlines ($290), and Hawaiian Airlines ($379).

  • 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 Illinois?

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

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Alternative routes for Illinois to Santa Rosa

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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 June 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$363Average$586FlexibilityNo cancel feeOn-time71%

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