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$163+ Cheap flights from Santa Rosa (STS) to Illinois

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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Santa Rosa to Illinois

Keep the following information in mind while searching for Santa Rosa to Illinois flight deals. Data was last updated September 15, 2025.

Round-trip from

$277
(Alaska Airlines)

One-way from

$163
(KAYAK)

Popular in

December

Cheapest in

February

Average price

$317
From Santa Rosa Sonoma County to Illinois
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One-way flight from Santa Rosa Sonoma County to Illinois
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Highest demand for flights based on searches. 9% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($10 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 Santa Rosa to Illinois

Cheapest flights from Santa Rosa to Illinois
Explore the most affordable flight options available from Santa Rosa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 12/58:00 amSTS - ORD
1 stop8h 54mAlaska Airlines
Tue 12/93:05 pmORD - STS
1 stop10h 03mAlaska Airlines
Deal found 9/14$277
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/219:43 amSTS - ORD
2 stops12h 16mAlaska Airlines
Tue 10/289:20 amORD - STS
1 stop8h 42mAlaska Airlines
Deal found 9/14$283
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/219:43 amSTS - ORD
2 stops12h 16mAlaska Airlines
Wed 10/299:20 amORD - STS
2 stops14h 26mAlaska Airlines
Deal found 9/14$289
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/79:43 amSTS - ORD
2 stops12h 16mAlaska Airlines
Wed 10/153:50 pmORD - STS
1 stop9h 26mAlaska Airlines
Deal found 9/14$293
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/147:53 pmSTS - ORD
1 stop26h 06mAlaska Airlines
Tue 11/119:20 amORD - STS
1 stop8h 42mAlaska Airlines
Deal found 9/13$297
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/256:25 amSTS - ORD
1 stop15h 34mAlaska Airlines
Tue 10/289:20 amORD - STS
2 stops14h 26mAlaska Airlines
Deal found 9/14$304
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/86:25 amSTS - ORD
1 stop10h 34mAlaska Airlines
Sat 10/113:50 pmORD - STS
1 stop9h 26mAlaska Airlines
Deal found 9/14$308
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 12/67:50 amSTS - ORD
2 stops14h 09mAlaska Airlines
Thu 12/113:05 pmORD - STS
1 stop10h 03mAlaska Airlines
Deal found 9/14$311
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/116:25 amSTS - ORD
1 stop15h 34mAlaska Airlines
Sat 11/88:00 amORD - STS
2 stops13h 27mAlaska Airlines
Deal found 9/13$315
This Hawaiian Airlines deal was found by Cheapflights users on 9/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/118:00 amSTS - ORD
1 stop8h 54mHawaiian Airlines
Sun 12/146:00 amORD - STS
1 stop9h 29mHawaiian Airlines
Deal found 9/12$316
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 12/28:00 amSTS - ORD
1 stop28h 09mAlaska Airlines
Tue 12/93:05 pmORD - STS
1 stop10h 03mAlaska Airlines
Deal found 9/14$317
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 11/177:46 pmSTS - ORD
1 stop16h 08mAlaska Airlines
Wed 11/192:54 pmORD - STS
1 stop11h 03mAlaska Airlines
Deal found 9/14$318

Cheapflights Fare Finder

 
Customize your flight search to find flights from Santa Rosa to Illinois 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 15, 2025.
Use the filters below to find and compare flights from Santa Rosa to Illinois that are best for you.

Fly from

Santa Rosa

Fly to

Illinois

Route

Depart

Return

Price

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 10/28

2:09 pm-11:59 pm

1 stop7h 50m

Chicago O'Hare Intl

Sat 11/15

9:20 am-9:46 pm

2 stops14h 26m

$283

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 10/21

9:43 am-2:50 pm

2 stops27h 07m

Chicago O'Hare Intl

Wed 11/5

9:20 am-4:02 pm

1 stop8h 42m

$283

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 10/21

9:43 am-11:59 pm

2 stops12h 16m

Chicago O'Hare Intl

Tue 10/28

9:20 am-9:46 pm

2 stops14h 26m

$289

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 10/15

6:25 am-11:59 pm

1 stop15h 34m

Chicago O'Hare Intl

Wed 10/22

3:50 pm-11:16 pm

1 stop9h 26m

$297

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 11/12

6:49 am-11:59 pm

1 stop15h 10m

Chicago O'Hare Intl

Tue 11/18

9:20 am-4:02 pm

1 stop8h 42m

$297

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Sat 11/15

6:49 am-7:55 pm

1 stop11h 06m

Chicago O'Hare Intl

Tue 11/18

9:20 am-4:02 pm

1 stop8h 42m

$297

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Mon 11/10

7:46 pm-1:54 pm

1 stop16h 08m

Chicago O'Hare Intl

Thu 11/13

9:20 am-4:02 pm

1 stop8h 42m

$297

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 11/11

7:46 pm-7:55 pm

1 stop22h 09m

Chicago O'Hare Intl

Sat 11/15

9:20 am-9:46 pm

2 stops14h 26m

$304

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 11/12

6:49 am-7:55 pm

1 stop11h 06m

Chicago O'Hare Intl

Sat 11/15

9:20 am-9:46 pm

2 stops14h 26m

$304

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Mon 11/10

7:46 pm-1:54 pm

1 stop16h 08m

Chicago O'Hare Intl

Sat 11/15

9:20 am-9:46 pm

2 stops14h 26m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 30 results
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Best time to book a flight from Santa Rosa to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $245). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $321). 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 STS to IL?

Find hourly flight availability from Santa Rosa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

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

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

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated September 15, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines and American Airlines from Santa Rosa to Illinois to help guide your decision. 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

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

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

    Most people fly from Santa Rosa Sonoma County (STS) if they book a flight from Santa Rosa to Illinois. Santa Rosa Sonoma County is conveniently located just 7.2 mi from Santa Rosa’s city center.

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

    Airlines like Alaska Airlines and Hawaiian Airlines fly from Santa Rosa to Illinois in about 7h 50m. The time it takes to get you to your destination can typically vary by up to 44m. The distance from Santa Rosa to Illinois is about 1842 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Santa Rosa to Illinois?

    When deciding which route to take from Santa Rosa to Illinois consider Santa Rosa Sonoma County - Chicago O'Hare Intl, Santa Rosa Sonoma County - Lambert-St Louis or Santa Rosa Sonoma County - Moline Quad-City as they are the most popular.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Santa Rosa to Illinois (average of $245). Flying from Santa Rosa to Illinois in March is currently the most expensive (average of $321). 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

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Alternative routes for Santa Rosa to Illinois

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Top 2 airlines flying from Santa Rosa to Illinois

Discover the top 2 airlines that operate flights from Santa Rosa to Illinois. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$308Average$542FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$316Average$653FlexibilityNo cancel feeOn-time71%

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