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$149+ 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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ORD
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$322
(Alaska Airlines)

One-way from

$149
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$343
Provider with most accurate pricing for San Francisco-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Chicago (CHI) flights.
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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. 6% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 5/286:58 pmSTS - ORD
1 stop26h 58mAlaska Airlines
Tue 6/36:00 amORD - STS
1 stop9h 25mAlaska Airlines
Deal found 4/29$322
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/217:00 amSTS - STL
2 stops15h 04mAlaska Airlines
Sat 5/246:22 pmSTL - STS
1 stop21h 03mAlaska Airlines
Deal found 4/30$480
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/14:16 pmSTS - STL
1 stop6h 12mAmerican Airlines
Sat 8/95:15 amSTL - STS
1 stop8h 22mAmerican Airlines
Deal found 4/30$564
This Hawaiian Airlines deal was found by Cheapflights users on 4/29. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/128:01 pmSTS - ORD
1 stop7h 39mHawaiian Airlines
Sun 6/151:03 pmORD - STS
1 stop8h 04mHawaiian Airlines
Deal found 4/29$576
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1512:24 pmSTS - MLI
1 stop7h 00mAmerican Airlines
Mon 5/196:30 amMLI - STS
1 stop7h 14mAmerican Airlines
Deal found 4/30$751
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1412:24 pmSTS - ORD
1 stop6h 44mAmerican Airlines
Sun 5/186:00 amORD - STS
1 stop7h 44mAmerican Airlines
Deal found 4/29$759
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 5/157:00 amSTS - MLI
2 stops12h 45mAlaska Airlines
Mon 5/196:00 amMLI - STS
2 stops9h 25mAlaska Airlines
Deal found 4/30$1,428

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 May 1, 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

Wed 5/28

6:58 pm-11:56 pm

1 stop26h 58m

Chicago O'Hare Intl

Tue 6/3

6:00 am-1:25 pm

1 stop9h 25m

$322

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Wed 5/21

7:00 am-12:04 am

2 stops15h 04m

Lambert-St Louis

Sat 5/24

6:22 pm-1:25 pm

1 stop21h 03m

$480

Santa RosaSt. Louis

STS - STL

STSSTL

Santa Rosa Sonoma County

Fri 8/1

4:16 pm-12:28 am

1 stop6h 12m

Lambert-St Louis

Sat 8/9

5:15 am-11:37 am

1 stop8h 22m

$564

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Thu 6/12

8:01 pm-5:40 am

1 stop7h 39m

Chicago O'Hare Intl

Sun 6/15

1:03 pm-7:07 pm

1 stop8h 04m

$576

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Thu 5/15

12:24 pm-9:24 pm

1 stop7h 00m

Moline Quad-City

Mon 5/19

6:30 am-11:44 am

1 stop7h 14m

$751

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 5/14

12:24 pm-9:08 pm

1 stop6h 44m

Chicago O'Hare Intl

Sun 5/18

6:00 am-11:44 am

1 stop7h 44m

$759

Santa RosaMoline

STS - MLI

STSMLI

Santa Rosa Sonoma County

Thu 5/15

7:00 am-9:45 pm

2 stops12h 45m

Moline Quad-City

Mon 5/19

6:00 am-1:25 pm

2 stops9h 25m

$1,428

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 6/11

8:01 pm-5:40 am

1 stop7h 39m

$149

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Wed 7/23

8:01 pm-5:40 am

1 stop7h 39m

$243

Santa RosaChicago

STS - ORD

STSORD

Santa Rosa Sonoma County

Tue 6/17

1:10 pm-12:59 am

2 stops9h 49m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 12 results
1
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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 May 1, 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.

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 May 1, 2025.
Read through reviews of airlines operating flights from Santa Rosa to Illinois, such as Alaska Airlines, Hawaiian Airlines and American Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,972 reviews

Entertainment

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Comfort

7.9

Food

7.1

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
9,972 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Entertainment

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Comfort

7.9

Food

7.1

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
2,408 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Entertainment

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Comfort

7.9

Food

7.1

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
9,972 reviews

Entertainment

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Comfort

7.9

Food

7.1

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 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.

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

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $149. Hawaiian Airlines flights start at $243 while deals on American Airlines start at $295 one-way.

  • 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$318Average$578FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$361Average$637FlexibilityNo cancel feeOn-time75%

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