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Cheap flights from Ontario to San Francisco from $139

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 10/18. 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 Ontario to San Francisco

Cheap round-trip flights

American Airlines Logo
10:09 am - 3:47 pmONT-STS
5h 38m1 stop
American Airlines Logo
12:53 pm - 6:35 pmSTS-ONT
5h 42m1 stop
$237American Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21
American Airlines Logo
6:10 am - 12:29 pmONT-STS
6h 19m1 stop
American Airlines Logo
12:53 pm - 6:59 pmSTS-ONT
6h 06m1 stop
$257American Airlines
Find Deal
Wed, Oct 1 - Mon, Oct 6
American Airlines Logo
10:09 am - 3:47 pmONT-STS
5h 38m1 stop
American Airlines Logo
4:17 pm - 9:49 pmSTS-ONT
5h 32m1 stop
$278American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
Alaska Airlines Logo
6:00 am - 1:36 pmONT-STS
7h 36m1 stop
Alaska Airlines Logo
2:22 pm - 8:53 pmSTS-ONT
6h 31m1 stop
$302Alaska Airlines
Find Deal
Sat, Oct 25 - Sat, Nov 1
Alaska Airlines Logo
6:11 pm - 1:26 pmONT-STS
19h 15m1 stop
Alaska Airlines Logo
2:22 pm - 8:53 pmSTS-ONT
6h 31m1 stop
$312Alaska Airlines
Find Deal
Mon, Oct 27 - Sat, Nov 1
Alaska Airlines Logo
6:00 am - 1:36 pmONT-STS
7h 36m1 stop
Alaska Airlines Logo
2:22 pm - 11:05 amSTS-ONT
20h 43m1 stop
$322Alaska Airlines
Find Deal
Sat, Oct 25 - Fri, Oct 31
Alaska Airlines Logo
6:00 am - 1:36 pmONT-STS
7h 36m1 stop
Alaska Airlines Logo
6:51 pm - 1:01 pmSTS-ONT
18h 10m1 stop
$332Alaska Airlines
Find Deal
Tue, Oct 21 - Fri, Oct 24
American Airlines Logo
10:09 am - 3:47 pmONT-STS
5h 38m1 stop
American Airlines Logo
4:17 pm - 9:49 pmSTS-ONT
5h 32m1 stop
$337American Airlines
Find Deal
Thu, Oct 23 - Fri, Oct 24
Alaska Airlines Logo
6:00 am - 1:36 pmONT-STS
7h 36m1 stop
Alaska Airlines Logo
2:30 pm - 12:37 pmSTS-ONT
22h 07m1 stop
$342Alaska Airlines
Find Deal
Wed, Oct 15 - Fri, Oct 17
Alaska Airlines Logo
7:43 pm - 1:36 pmONT-STS
17h 53m1 stop
Alaska Airlines Logo
2:30 pm - 4:53 pmSTS-ONT
26h 23m2 stops
$351Alaska Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21

Alaska Airlines flights from Ontario to Santa Rosa

Our best Alaska Airlines deals on Ontario to Santa Rosa flight tickets
Alaska Airlines
Oct 25
ONT6:00 amOntario
7h 36m
1 stop
STS1:36 pmSanta Rosa Sonoma County
Nov 1
STS2:22 pmSanta Rosa Sonoma County
6h 31m
1 stop
ONT8:53 pmOntario
$302
Find similar
Alaska Airlines
Oct 27
ONT6:11 pmOntario
19h 15m
1 stop
STS1:26 pmSanta Rosa Sonoma County
Nov 1
STS2:22 pmSanta Rosa Sonoma County
6h 31m
1 stop
ONT8:53 pmOntario
$312
Find similar
Alaska Airlines
Oct 25
ONT6:00 amOntario
7h 36m
1 stop
STS1:36 pmSanta Rosa Sonoma County
Oct 31
STS2:22 pmSanta Rosa Sonoma County
20h 43m
1 stop
ONT11:05 amOntario
$322
Find similar

American Airlines flights from Ontario to Santa Rosa

Our best American Airlines deals on Ontario to Santa Rosa flight tickets
American Airlines
Oct 14
ONT10:09 amOntario
5h 38m
1 stop
STS3:47 pmSanta Rosa Sonoma County
Oct 21
STS12:53 pmSanta Rosa Sonoma County
5h 42m
1 stop
ONT6:35 pmOntario
$237
Find similar
American Airlines
Oct 1
ONT6:10 amOntario
6h 19m
1 stop
STS12:29 pmSanta Rosa Sonoma County
Oct 6
STS12:53 pmSanta Rosa Sonoma County
6h 06m
1 stop
ONT6:59 pmOntario
$257
Find similar
American Airlines
Oct 23
ONT10:09 amOntario
5h 38m
1 stop
STS3:47 pmSanta Rosa Sonoma County
Oct 27
STS4:17 pmSanta Rosa Sonoma County
5h 32m
1 stop
ONT9:49 pmOntario
$278
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 September 16, 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

Tue 10/14

10:09 am-3:47 pm

1 stop5h 38m

Santa Rosa Sonoma County

Tue 10/21

12:53 pm-6:35 pm

1 stop5h 42m

$237

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 10/1

6:10 am-12:29 pm

1 stop6h 19m

Santa Rosa Sonoma County

Mon 10/6

12:53 pm-6:59 pm

1 stop6h 06m

$257

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 10/23

10:09 am-3:47 pm

1 stop5h 38m

Santa Rosa Sonoma County

Mon 10/27

4:17 pm-9:49 pm

1 stop5h 32m

$278

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/25

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Sat 11/1

2:22 pm-8:53 pm

1 stop6h 31m

$302

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 10/27

6:11 pm-1:26 pm

1 stop19h 15m

Santa Rosa Sonoma County

Sat 11/1

2:22 pm-8:53 pm

1 stop6h 31m

$312

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/25

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Fri 10/31

2:22 pm-11:05 am

1 stop20h 43m

$322

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 10/21

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Fri 10/24

6:51 pm-1:01 pm

1 stop18h 10m

$332

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 10/23

10:09 am-3:47 pm

1 stop5h 38m

Santa Rosa Sonoma County

Fri 10/24

4:17 pm-9:49 pm

1 stop5h 32m

$337

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 10/15

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Fri 10/17

2:30 pm-12:37 pm

1 stop22h 07m

$342

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 10/14

7:43 pm-1:36 pm

1 stop17h 53m

Santa Rosa Sonoma County

Tue 10/21

2:30 pm-4:53 pm

2 stops26h 23m

$351

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 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 $284.

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 $238. Flights at noon are often more expensive with an average ticket price of $296.

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

Direct flights

None
There are no direct flights from Ontario to Santa Rosa. There are no popular flight routes from Ontario to Santa Rosa.
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 5h 13m.

  • 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 $67Free CancellationRating
7.5
78 reviews
Search Avelo Airlines flights
American AirlinesPriceFrom $222Free 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 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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