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Cheap flights from Ontario to San Francisco from $99

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Francisco departing on 3/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
1:30 pm - 3:01 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
3:45 pm - 5:12 pm
STS
-
ONT
1h 27mnonstop
$157Alaska Airlines
Sat, May 9 - Thu, May 14
American Airlines Logo
9:59 am - 3:53 pm
ONT
-
STS
5h 54m1 stop
American Airlines Logo
12:55 pm - 6:20 pm
STS
-
ONT
5h 25m1 stop
$176American Airlines
Sat, Jan 24 - Tue, Jan 27
Alaska Airlines Logo
4:03 pm - 11:59 pm
ONT
-
STS
7h 56m1 stop
Alaska Airlines Logo
9:33 pm - 3:08 pm
STS
-
ONT
17h 35m1 stop
$204Alaska Airlines
Fri, Jan 9 - Sun, Jan 11
Alaska Airlines Logo
4:03 pm - 10:35 am
ONT
-
STS
18h 32m1 stop
Alaska Airlines Logo
9:33 pm - 8:36 pm
STS
-
ONT
23h 03m1 stop
$219Alaska Airlines
Tue, Feb 3 - Mon, Feb 9
Alaska Airlines Logo
4:03 pm - 11:59 pm
ONT
-
STS
7h 56m1 stop
Alaska Airlines Logo
11:15 am - 8:36 pm
STS
-
ONT
9h 21m1 stop
$220Alaska Airlines
Fri, Jan 9 - Wed, Jan 14
Alaska Airlines Logo
1:30 pm - 3:01 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
3:45 pm - 5:12 pm
STS
-
ONT
1h 27mnonstop
$227Alaska Airlines
Sun, May 10 - Wed, May 13
American Airlines Logo
9:59 am - 3:53 pm
ONT
-
STS
5h 54m1 stop
American Airlines Logo
12:55 pm - 6:20 pm
STS
-
ONT
5h 25m1 stop
$236American Airlines
Tue, Jan 20 - Tue, Jan 27
Alaska Airlines Logo
1:46 pm - 8:41 pm
ONT
-
STS
6h 55m1 stop
Alaska Airlines Logo
9:33 pm - 3:08 pm
STS
-
ONT
17h 35m1 stop
$238Alaska Airlines
Sat, Jan 10 - Sun, Jan 11
Alaska Airlines Logo
4:03 pm - 11:59 pm
ONT
-
STS
7h 56m1 stop
Alaska Airlines Logo
6:50 am - 5:03 pm
STS
-
ONT
10h 13m1 stop
$239Alaska Airlines
Fri, Jan 9 - Sat, Jan 10
Alaska Airlines Logo
1:30 pm - 3:01 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
3:45 pm - 5:12 pm
STS
-
ONT
1h 27mnonstop
$247Alaska Airlines
Fri, May 8 - Sun, May 10

American Airlines flights from Ontario to Santa Rosa

Our best American Airlines deals on Ontario to Santa Rosa flight tickets
American Airlines
Jan 24
ONT9:59 amOntario
5h 54m
1 stop
STS3:53 pmSanta Rosa Sonoma County
Jan 27
STS12:55 pmSanta Rosa Sonoma County
5h 25m
1 stop
ONT6:20 pmOntario
$176
Find similar
American Airlines
Jan 20
ONT9:59 amOntario
5h 54m
1 stop
STS3:53 pmSanta Rosa Sonoma County
Jan 27
STS12:55 pmSanta Rosa Sonoma County
5h 25m
1 stop
ONT6:20 pmOntario
$236
Find similar
American Airlines
Jan 14
ONT9:59 amOntario
5h 54m
1 stop
STS3:53 pmSanta Rosa Sonoma County
Jan 18
STS12:55 pmSanta Rosa Sonoma County
5h 26m
1 stop
ONT6:21 pmOntario
$266
Find similar

Alaska Airlines flights from Ontario to Santa Rosa

Our best Alaska Airlines deals on Ontario to Santa Rosa flight tickets
Alaska Airlines
May 9
ONT1:30 pmOntario
1h 31m
STS3:01 pmSanta Rosa Sonoma County
May 14
STS3:45 pmSanta Rosa Sonoma County
1h 27m
ONT5:12 pmOntario
$157
Find similar
Alaska Airlines
Jan 9
ONT4:03 pmOntario
7h 56m
1 stop
STS11:59 pmSanta Rosa Sonoma County
Jan 11
STS9:33 pmSanta Rosa Sonoma County
17h 35m
1 stop
ONT3:08 pmOntario
$204
Find similar
Alaska Airlines
Feb 3
ONT4:03 pmOntario
18h 32m
1 stop
STS10:35 amSanta Rosa Sonoma County
Feb 9
STS9:33 pmSanta Rosa Sonoma County
23h 03m
1 stop
ONT8:36 pmOntario
$219
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario 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 December 11, 2025.
Use the filters below to find and compare flights from Ontario to Santa Rosa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 5/9

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Thu 5/14

3:45 pm-5:12 pm

Nonstop1h 27m

$157

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/24

9:59 am-3:53 pm

1 stop5h 54m

Santa Rosa Sonoma County

Tue 1/27

12:55 pm-6:20 pm

1 stop5h 25m

$176

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 1/9

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Sun 1/11

9:33 pm-3:08 pm

1 stop17h 35m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 2/3

4:03 pm-10:35 am

1 stop18h 32m

Santa Rosa Sonoma County

Mon 2/9

9:33 pm-8:36 pm

1 stop23h 03m

$219

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 1/9

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Wed 1/14

11:15 am-8:36 pm

1 stop9h 21m

$220

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sun 5/10

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Wed 5/13

3:45 pm-5:12 pm

Nonstop1h 27m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 1/20

9:59 am-3:53 pm

1 stop5h 54m

Santa Rosa Sonoma County

Tue 1/27

12:55 pm-6:20 pm

1 stop5h 25m

$236

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/10

1:46 pm-8:41 pm

1 stop6h 55m

Santa Rosa Sonoma County

Sun 1/11

9:33 pm-3:08 pm

1 stop17h 35m

$238

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 1/9

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Sat 1/10

6:50 am-5:03 pm

1 stop10h 13m

$239

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 5/8

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sun 5/10

3:45 pm-5:12 pm

Nonstop1h 27m

$247

Flights are sorted by cheapest round-trip flights first.

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See travel insights to San Francisco from

How to get the cheapest flight ticket from Ontario 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 month to fly to Santa Rosa?

If you are unable to visit Santa Rosa during the month of December, then departing from Ontario during the month February is also very affordable. Most momondo users find prices during this month for around $95.

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

Our data shows that Wednesday is the least expensive day to fly to Santa Rosa. Tickets to fly out on this day can be as low as $207. On the other hand, Friday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $287.

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

Our data shows that the cheapest Ontario 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 $236. Flights in the morning are often more expensive with an average ticket price of $276.

What is the cheapest Ontario to Santa Rosa Sonoma County flight route?

Fly from Ontario to Santa Rosa Sonoma County for the best Ontario - Santa Rosa Sonoma County flight prices

What cabin class options are available on Ontario to Santa Rosa Sonoma County flights?

There is only 1 cabin class available to choose from on Ontario to Santa Rosa Sonoma County flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

When to book flights from Ontario to Santa Rosa

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Santa Rosa according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Santa Rosa (ONT to STS) flight deals and tips

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

Fastest flight time

1h 31m

Direct flights

Every day

Airports in Santa Rosa

1 airport
The fastest flight from Ontario to Santa Rosa takes 1h 31m
Direct flights go from Ontario to Santa Rosa every day.
There is 1 airport in Santa Rosa. From Ontario there are direct flights to Santa Rosa Sonoma County (STS).
Search flight deals

  • How far is Ontario to Santa Rosa Sonoma County by plane?

    There are 413.2 mi between Ontario and Santa Rosa Sonoma County. In terms of flight time, this usually takes a little over 1h 31m.

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

    Prices for flights from Ontario Airport to Santa Rosa Sonoma County Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Santa Rosa Sonoma County Airport.

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

    The necessary travel and health documents for your Santa Rosa Sonoma County Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Ontario to Santa Rosa?

  • What is the most popular airline from Ontario to Santa Rosa?

Best airlines flying from Ontario to Santa Rosa

Compare and see reviews for airlines that fly from Ontario to Santa Rosa with momondo
Airline
Rating
Free Cancellation
Price
Avelo AirlinesPriceFrom $72Free CancellationRating
7.5
84 reviews
Search Avelo Airlines flights
Alaska AirlinesPriceFrom $117Free CancellationRating
8.0
11,429 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $222Free CancellationRating
7.2
11,048 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 Ontario to Santa Rosa?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Santa Rosa. Millions of users trust and use momondo every year so you are in good hands.

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

All flight searches from Ontario to Santa Rosa on momondo can be filtered to show those which offer flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Santa Rosa.

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

Yes momondo offers price alerts on flights to Santa Rosa from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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