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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 10/10. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$177Alaska Airlines
Tue, Sep 1 - Tue, Sep 8
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$187Alaska Airlines
Thu, Sep 3 - Tue, Sep 8
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$197Alaska Airlines
Fri, Sep 25 - Mon, Sep 28
Alaska Airlines Logo
4:32 pm - 6:12 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$202Alaska Airlines
Sat, Aug 22 - Mon, Aug 24
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$212Alaska Airlines
Fri, Aug 21 - Sun, Aug 23
Alaska Airlines Logo
6:43 pm - 8:14 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
4:35 pm - 6:03 pm
STS
-
ONT
1h 28mnonstop
$222Alaska Airlines
Thu, Jul 2 - Sun, Jul 5
Alaska Airlines Logo
6:43 pm - 8:14 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
4:35 pm - 6:03 pm
STS
-
ONT
1h 28mnonstop
$227Alaska Airlines
Thu, Jul 23 - Sun, Jul 26
Southwest Logo
4:00 pm - 10:35 pm
ONT
-
STS
6h 35m
2 stops
Southwest Logo
7:05 am - 1:10 pm
STS
-
ONT
6h 05m
2 stops
$233Southwest
Thu, Sep 24 - Sun, Sep 27
Alaska Airlines Logo
6:31 pm - 8:07 pm
ONT
-
STS
1h 36mnonstop
Alaska Airlines Logo
3:02 pm - 4:32 pm
STS
-
ONT
1h 30mnonstop
$237Alaska Airlines
Tue, Nov 17 - Wed, Nov 18
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$242Alaska Airlines
Fri, Aug 21 - Sun, Aug 23

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Alaska Airlines flights from Ontario to Santa Rosa

Our best Alaska Airlines deals on Ontario to Santa Rosa flight tickets
Alaska Airlines
Sep 1
ONT4:27 pmOntario
1h 40m
STS6:07 pmSanta Rosa Sonoma County
Sep 8
STS2:09 pmSanta Rosa Sonoma County
1h 38m
ONT3:47 pmOntario
$177
Alaska Airlines
Sep 3
ONT4:27 pmOntario
1h 40m
STS6:07 pmSanta Rosa Sonoma County
Sep 8
STS2:09 pmSanta Rosa Sonoma County
1h 38m
ONT3:47 pmOntario
$187
Alaska Airlines
Sep 25
ONT4:27 pmOntario
1h 40m
STS6:07 pmSanta Rosa Sonoma County
Sep 28
STS2:09 pmSanta Rosa Sonoma County
1h 38m
ONT3:47 pmOntario
$197

Southwest flights from Ontario to Santa Rosa

Our best Southwest deals on Ontario to Santa Rosa flight tickets
Southwest
Sep 24
ONT4:00 pmOntario
6h 35m
2 stops
STS10:35 pmSanta Rosa Sonoma County
Sep 27
STS7:05 amSanta Rosa Sonoma County
6h 05m
2 stops
ONT1:10 pmOntario
$233
Southwest
Aug 18
ONT7:45 amOntario
3h 35m
1 stop
STS11:20 amSanta Rosa Sonoma County
Aug 24
STS2:55 pmSanta Rosa Sonoma County
6h 50m
1 stop
ONT9:45 pmOntario
$262
Southwest
Dec 7
ONT1:30 pmOntario
7h 55m
2 stops
STS9:25 pmSanta Rosa Sonoma County
Dec 21
STS5:05 pmSanta Rosa Sonoma County
7h 10m
2 stops
ONT12:15 amOntario
$263

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 June 10, 2026.
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

Cheapest round-trip

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 9/1

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Tue 9/8

2:09 pm-3:47 pm

Nonstop1h 38m

$177

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 9/3

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Tue 9/8

2:09 pm-3:47 pm

Nonstop1h 38m

$187

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 9/25

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Mon 9/28

2:09 pm-3:47 pm

Nonstop1h 38m

$197

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 8/22

4:32 pm-6:12 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Mon 8/24

2:09 pm-3:47 pm

Nonstop1h 38m

$202

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 8/21

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Sun 8/23

2:09 pm-3:47 pm

Nonstop1h 38m

$212
Quickest round-trip

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 7/2

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sun 7/5

4:35 pm-6:03 pm

Nonstop1h 28m

$222

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 7/23

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sun 7/26

4:35 pm-6:03 pm

Nonstop1h 28m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 9/24

4:00 pm-10:35 pm

2 stops6h 35m

Santa Rosa Sonoma County

Sun 9/27

7:05 am-1:10 pm

2 stops6h 05m

$233

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 11/17

6:31 pm-8:07 pm

Nonstop1h 36m

Santa Rosa Sonoma County

Wed 11/18

3:02 pm-4:32 pm

Nonstop1h 30m

$237

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 8/21

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Sun 8/23

2:09 pm-3:47 pm

Nonstop1h 38m

$242

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 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 typical price of a round-trip flight between Ontario and Santa Rosa?

What is the cheapest month to fly to Santa Rosa?

If you are unable to visit Santa Rosa during the month of February, then departing from Ontario during the month November is also very affordable. Most momondo users find prices during this month for around $127.

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 $240. 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 afternoon. Our users have found flights to Santa Rosa in the afternoon for as low as $249. Flights at noon are often more expensive with an average ticket price of $282.

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 flights?

There are 2 cabin classes available to choose from on Ontario to Santa Rosa flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Santa Rosa flights?

You could potentially save up to 8% on your flight if you consider stops on a Ontario to Santa Rosa flight.

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

Best Price Found

$138

Fastest flight time

1h 31m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in Santa Rosa

1 airport
The best one-way flight to Santa Rosa from Ontario in the past 72 hours is $138. The best round-trip flight deal from Ontario to Santa Rosa found on momondo in the last 72 hours is $227.
The fastest flight from Ontario to Santa Rosa takes 1h 31m
Direct flights go from Ontario to Santa Rosa on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. The only airline offering direct flights is Alaska Airlines.
There is 1 airport in Santa Rosa. From Ontario there are direct flights to Santa Rosa Sonoma County (STS).
Search flight deals

Frequently asked questions about flying from Ontario to Santa Rosa

  • 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
American AirlinesPriceFrom $107Free CancellationRating
7.1
11,640 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $117Free CancellationRating
7.9
12,481 reviews
Search Alaska Airlines flights

  • Alaska Airlines Flights From Ontario to Santa Rosa

    Alaska Airlines operates around 2 flights from Ontario to Santa Rosa every week. The average price of these flights found in the last 72 hours has been $227, but momondo users have found Alaska Airlines deals from Ontario to Santa Rosa from as low as $117 round-trip. Alaska Airlines has been scored 7.9/10 in 12,481 reviews.

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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