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Cheap flights from Illinois to San Francisco from $135

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Francisco departing on 10/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Illinois to San Francisco

Cheap round-trip flights

Alaska Airlines Logo
3:50 pm - 11:16 pmORD-STS
9h 26m1 stop
Alaska Airlines Logo
6:25 am - 11:59 pmSTS-ORD
15h 34m1 stop
$269Alaska Airlines
Find Deal
Sat, Oct 11 - Sat, Oct 18
Logo
6:30 am - 11:59 pmORD-STS
19h 29m1 stop
Logo
7:03 am - 11:13 pmSTS-ORD
14h 10m1 stop
$278
Find Deal
Sun, Sep 14 - Sat, Sep 20
Alaska Airlines Logo
2:54 pm - 11:57 pmORD-STS
11h 03m1 stop
Alaska Airlines Logo
6:49 am - 11:59 pmSTS-ORD
15h 10m1 stop
$287Alaska Airlines
Find Deal
Thu, Nov 6 - Tue, Nov 11
Alaska Airlines Logo
7:59 pm - 10:07 amORD-STS
16h 08m1 stop
Alaska Airlines Logo
2:30 pm - 11:59 pmSTS-ORD
7h 29m1 stop
$293Alaska Airlines
Find Deal
Mon, Oct 6 - Sat, Oct 11
Logo
12:54 pm - 11:59 pmORD-STS
13h 05m1 stop
Logo
7:03 am - 10:42 amSTS-ORD
25h 39m2 stops
$298
Find Deal
Sun, Sep 14 - Sat, Sep 20
Alaska Airlines Logo
5:45 pm - 1:36 pmORD-STS
21h 51m1 stop
Alaska Airlines Logo
2:28 pm - 12:03 amSTS-ORD
7h 35m1 stop
$318Alaska Airlines
Find Deal
Tue, Sep 16 - Tue, Sep 23
Alaska Airlines Logo
6:20 am - 7:12 pmORD-STS
14h 52m2 stops
Alaska Airlines Logo
2:28 pm - 12:03 amSTS-ORD
7h 35m1 stop
$332Alaska Airlines
Find Deal
Wed, Sep 10 - Sat, Sep 13
Alaska Airlines Logo
5:59 pm - 1:36 pmORD-STS
21h 37m1 stop
Alaska Airlines Logo
6:25 am - 6:59 pmSTS-ORD
10h 34m1 stop
$335Alaska Airlines
Find Deal
Fri, Oct 17 - Mon, Oct 20
Hawaiian Airlines Logo
3:57 pm - 10:06 pmSTL-STS
8h 09m1 stop
Hawaiian Airlines Logo
2:30 pm - 12:03 amSTS-STL
7h 33m1 stop
$356Hawaiian Airlines
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Tue, Oct 7 - Tue, Oct 14
Hawaiian Airlines Logo
6:00 am - 1:36 pmSTL-STS
9h 36m1 stop
Hawaiian Airlines Logo
7:00 am - 5:34 pmSTS-STL
8h 34m1 stop
$632Hawaiian Airlines
Find Deal
Tue, Sep 2 - Sat, Sep 6

Alaska Airlines flights from Illinois to Santa Rosa

Our best Alaska Airlines deals on Illinois to Santa Rosa flight tickets
Alaska Airlines
Oct 11
ORD3:50 pmChicago O'Hare Intl
9h 26m
1 stop
STS11:16 pmSanta Rosa Sonoma County
Oct 18
STS6:25 amSanta Rosa Sonoma County
15h 34m
1 stop
ORD11:59 pmChicago O'Hare Intl
$269
Find similar
Alaska Airlines
Nov 6
ORD2:54 pmChicago O'Hare Intl
11h 03m
1 stop
STS11:57 pmSanta Rosa Sonoma County
Nov 11
STS6:49 amSanta Rosa Sonoma County
15h 10m
1 stop
ORD11:59 pmChicago O'Hare Intl
$287
Find similar
Alaska Airlines
Oct 6
ORD7:59 pmChicago O'Hare Intl
16h 08m
1 stop
STS10:07 amSanta Rosa Sonoma County
Oct 11
STS2:30 pmSanta Rosa Sonoma County
7h 29m
1 stop
ORD11:59 pmChicago O'Hare Intl
$293
Find similar

Hawaiian Airlines flights from Illinois to Santa Rosa

Our best Hawaiian Airlines deals on Illinois to Santa Rosa flight tickets
Hawaiian Airlines
Oct 7
STL3:57 pmLambert-St Louis
8h 09m
1 stop
STS10:06 pmSanta Rosa Sonoma County
Oct 14
STS2:30 pmSanta Rosa Sonoma County
7h 33m
1 stop
STL12:03 amLambert-St Louis
$356
Find similar
Hawaiian Airlines
Sep 2
ORD6:20 amChicago O'Hare Intl
9h 16m
1 stop
STS1:36 pmSanta Rosa Sonoma County
Sep 6
STS2:28 pmSanta Rosa Sonoma County
7h 35m
1 stop
ORD12:03 amChicago O'Hare Intl
$574
Find similar
Hawaiian Airlines
Sep 3
ORD1:01 pmChicago O'Hare Intl
9h 22m
1 stop
STS8:23 pmSanta Rosa Sonoma County
Sep 4
STS2:28 pmSanta Rosa Sonoma County
7h 35m
1 stop
ORD12:03 amChicago O'Hare Intl
$624
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from Illinois to Santa Rosa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sat 10/11

3:50 pm-11:16 pm

1 stop9h 26m

Santa Rosa Sonoma County

Sat 10/18

6:25 am-11:59 pm

1 stop15h 34m

$269

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sun 9/14

6:30 am-11:59 pm

1 stop19h 29m

Santa Rosa Sonoma County

Sat 9/20

7:03 am-11:13 pm

1 stop14h 10m

$278

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Thu 11/6

2:54 pm-11:57 pm

1 stop11h 03m

Santa Rosa Sonoma County

Tue 11/11

6:49 am-11:59 pm

1 stop15h 10m

$287

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Mon 10/6

7:59 pm-10:07 am

1 stop16h 08m

Santa Rosa Sonoma County

Sat 10/11

2:30 pm-11:59 pm

1 stop7h 29m

$293

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Sun 9/14

12:54 pm-11:59 pm

1 stop13h 05m

Santa Rosa Sonoma County

Sat 9/20

7:03 am-10:42 am

2 stops25h 39m

$298

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Tue 9/16

5:45 pm-1:36 pm

1 stop21h 51m

Santa Rosa Sonoma County

Tue 9/23

2:28 pm-12:03 am

1 stop7h 35m

$318

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Wed 9/10

6:20 am-7:12 pm

2 stops14h 52m

Santa Rosa Sonoma County

Sat 9/13

2:28 pm-12:03 am

1 stop7h 35m

$332

ChicagoSanta Rosa

ORD - STS

ORDSTS

Chicago O'Hare Intl

Fri 10/17

5:59 pm-1:36 pm

1 stop21h 37m

Santa Rosa Sonoma County

Mon 10/20

6:25 am-6:59 pm

1 stop10h 34m

$335

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 10/7

3:57 pm-10:06 pm

1 stop8h 09m

Santa Rosa Sonoma County

Tue 10/14

2:30 pm-12:03 am

1 stop7h 33m

$356

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 9/2

6:00 am-1:36 pm

1 stop9h 36m

Santa Rosa Sonoma County

Sat 9/6

7:00 am-5:34 pm

1 stop8h 34m

$632

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Francisco from

How to get the cheapest flight ticket from Illinois to Santa Rosa

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Santa Rosa?

Our data shows that Tuesday is the least expensive day to fly to Santa Rosa. Tickets to fly out on this day can be as low as $517. On the other hand, Monday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $703.

What is the cheapest time of day to depart on your flight to Santa Rosa?

Our data shows that the cheapest Illinois to Santa Rosa flights are usually those with departure times in the evening. Our users have found flights to Santa Rosa in the evening for as low as $453. Flights in the morning are often more expensive with an average ticket price of $577.

Cheap Illinois to Santa Rosa flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Santa Rosa

Direct flights

None
There are no direct flights from Illinois to Santa Rosa. There are no popular flight routes from Illinois to Santa Rosa.
Search flight deals

  • When did momondo last update prices for flights from Illinois to Santa Rosa Sonoma County Airport?

    Prices for flights from Illinois to Santa Rosa Sonoma County Airport refresh daily.

  • How many operators does momondo search for flights from Illinois to Santa Rosa Sonoma County Airport?

  • How old do you have to be to fly from Illinois to Santa Rosa Sonoma County Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Santa Rosa Sonoma County Airport.

  • What documentation or ID do you need to fly to Santa Rosa Sonoma County Airport?

    The required travel and health documents for your Santa Rosa Sonoma County Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Santa Rosa Sonoma County Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to Santa Rosa

Compare and see reviews for airlines that fly from Illinois to Santa Rosa with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $384Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Fort Bragg
Mendocino
Ukiah
Little River
Point Arena

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Santa Rosa?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Santa Rosa. momondo saves you time and could save you money on your trip.

Can I find flights from Illinois to Santa Rosa with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Illinois to Santa Rosa flights to just show those with flexible booking policies.

How can momondo help me find flights from Illinois to Santa Rosa?

Once you have performed a search for Illinois to Santa Rosa flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Illinois to Santa Rosa right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Santa Rosa, momondo offers a useful price alert feature which will track prices for flights to Santa Rosa from Illinois and alert you when they change.

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