What is the cheapest airline that flies from Ontario to San Francisco Bay Area?

Alaska Airlines, Southwest, and United Airlines are the most popular carriers operating from Ontario to San Francisco Bay Area

How many flights depart from Ontario to San Francisco Bay Area on average per week?

The number of flights available between Ontario and San Francisco Bay Area is 81 per week as of April 2026. The most frequent departure day is Fri, with 23% of weekly flights leaving on this day.

What airlines fly to San Francisco Bay Area?

United Airlines, Southwest and Frontier are the top three most popular airlines that fly to San Francisco Bay Area from Ontario according to our data. United Airlines is the first choice among our users, with 28% of people opting to fly with this airline when traveling to San Francisco Bay Area. Keep in mind that there are 11 different airlines that fly to San Francisco Bay Area on a routine basis, so you have a few additional options to choose from.

How many flights depart from Ontario to San Francisco Bay Area on average per day?

The number of flights available between Ontario and San Francisco Bay Area is 11 per day as of April 2026. The most frequent departure time is 6:00AM, with 40% of daily flights leaving at noon.

When did momondo last update prices for flights from Ontario Airport to San Francisco Bay Area?

Prices for flights from Ontario Airport to San Francisco Bay Area are refreshed on a daily basis.

How many operators does momondo search for flights from Ontario Airport to San Francisco Bay Area?

There are 5 operators available for flights from Ontario Airport to San Francisco Bay Area as of April 2026.

How old do you have to be to fly from Ontario Airport to San Francisco Bay Area?

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 San Francisco Bay Area.

What documentation or ID do you need to fly to San Francisco Bay Area?

The necessary travel and health documents for your San Francisco Bay Area 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.

$59 Cheap Flights from Ontario to San Francisco Bay Area in 2026

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Find the cheapest flights from Ontario to San Francisco Bay Area

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:48 pm - 2:20 pm

ONT

STS

1h 32mnonstop

10:41 am - 12:08 pm

STS

ONT

1h 27mnonstop

$97Alaska Airlines

Tue, Apr 28 - Tue, May 5

12:59 am - 11:25 pm

ONT

SFO

22h 26m

1 stop

9:18 am - 10:52 am

SFO

ONT

1h 34mnonstop

$116Frontier

Mon, Apr 27 - Thu, Apr 30

6:00 am - 7:29 am

ONT

SFO

1h 29mnonstop

8:10 am - 9:41 am

SFO

ONT

1h 31mnonstop

$117United Airlines

Tue, Apr 28 - Wed, May 6

5:45 am - 7:00 am

ONT

SJC

1h 15mnonstop

7:15 am - 8:30 am

SJC

ONT

1h 15mnonstop

$117Southwest

Wed, May 20 - Wed, May 27

12:48 pm - 2:20 pm

ONT

STS

1h 32mnonstop

10:41 am - 12:08 pm

STS

ONT

1h 27mnonstop

$117Alaska Airlines

Wed, Apr 29 - Sat, May 2

8:30 am - 11:04 pm

ONT

SFO

14h 34m

1 stop

9:19 am - 10:51 am

SFO

ONT

1h 32mnonstop

$118Frontier

Wed, May 6 - Thu, May 7

8:17 pm - 9:55 pm

ONT

SFO

1h 38mnonstop

9:15 am - 3:09 pm

SFO

ONT

5h 54m

1 stop

$119Frontier

Thu, May 14 - Sat, May 16

8:17 pm - 9:55 pm

ONT

SFO

1h 38mnonstop

11:26 am - 1:05 pm

SFO

ONT

1h 39mnonstop

$120Frontier

Mon, May 18 - Wed, May 20

8:17 pm - 9:55 pm

ONT

SFO

1h 38mnonstop

9:19 am - 10:51 am

SFO

ONT

1h 32mnonstop

$121Frontier

Wed, May 13 - Mon, May 18

12:30 pm - 1:45 pm

ONT

SJC

1h 15mnonstop

6:15 am - 11:35 am

SJC

ONT

5h 20m

1 stop

$127Southwest

Wed, May 20 - Wed, May 27

United Airlines flights from Ontario to San Francisco Bay Area

Our best United Airlines deals on Ontario to San Francisco Bay Area flight tickets

United Airlines

Apr 28

ONT6:00 amOntario

1h 29m

SFO7:29 amSan Francisco

May 6

SFO8:10 amSan Francisco

1h 31m

ONT9:41 amOntario

$117

United Airlines

Apr 29

ONT11:05 amOntario

1h 29m

SFO12:34 pmSan Francisco

Apr 30

SFO8:10 amSan Francisco

1h 29m

ONT9:39 amOntario

$147

Frontier flights from Ontario to San Francisco Bay Area

Our best Frontier deals on Ontario to San Francisco Bay Area flight tickets

Frontier

Apr 27

ONT12:59 amOntario

22h 26m

1 stop

SFO11:25 pmSan Francisco

Apr 30

SFO9:18 amSan Francisco

1h 34m

ONT10:52 amOntario

$116

Frontier

May 6

ONT8:30 amOntario

14h 34m

1 stop

SFO11:04 pmSan Francisco

May 7

SFO9:19 amSan Francisco

1h 32m

ONT10:51 amOntario

$118

Frontier

May 14

ONT8:17 pmOntario

1h 38m

SFO9:55 pmSan Francisco

May 16

SFO9:15 amSan Francisco

5h 54m

1 stop

ONT3:09 pmOntario

$119

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to San Francisco Bay Area that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 4/28

12:48 pm-2:20 pm

Nonstop1h 32m

Santa Rosa Sonoma County

Tue 5/5

10:41 am-12:08 pm

Nonstop1h 27m

$97

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 4/27

12:59 am-11:25 pm

1 stop22h 26m

San Francisco

Thu 4/30

9:18 am-10:52 am

Nonstop1h 34m

$116

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 4/28

6:00 am-7:29 am

Nonstop1h 29m

San Francisco

Wed 5/6

8:10 am-9:41 am

Nonstop1h 31m

$117

Quickest round-trip

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/20

5:45 am-7:00 am

Nonstop1h 15m

San Jose

Wed 5/27

7:15 am-8:30 am

Nonstop1h 15m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 4/29

12:48 pm-2:20 pm

Nonstop1h 32m

Santa Rosa Sonoma County

Sat 5/2

10:41 am-12:08 pm

Nonstop1h 27m

$117

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/6

8:30 am-11:04 pm

1 stop14h 34m

San Francisco

Thu 5/7

9:19 am-10:51 am

Nonstop1h 32m

$118

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 5/14

8:17 pm-9:55 pm

Nonstop1h 38m

San Francisco

Sat 5/16

9:15 am-3:09 pm

1 stop5h 54m

$119

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 5/18

8:17 pm-9:55 pm

Nonstop1h 38m

San Francisco

Wed 5/20

11:26 am-1:05 pm

Nonstop1h 39m

$120

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/13

8:17 pm-9:55 pm

Nonstop1h 38m

San Francisco

Mon 5/18

9:19 am-10:51 am

Nonstop1h 32m

$121

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/20

12:30 pm-1:45 pm

Nonstop1h 15m

San Jose

Wed 5/27

6:15 am-11:35 am

1 stop5h 20m

$127

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to San Francisco Bay Area

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

Prices

Airlines

Other information

What is the cheapest month to fly to San Francisco Bay Area?

In general, May is the cheapest month to fly from Ontario to San Francisco Bay Area. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $99. If you aren’t able to travel to San Francisco Bay Area during the month of May, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $137.

What is the cheapest day to depart on your flight to San Francisco Bay Area?

On average, the least expensive day to fly to San Francisco Bay Area from Ontario is on a Friday. momondo users have found tickets for Friday departures for as low as $170. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday 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 $351.

What is the cheapest time of day to depart on your flight to San Francisco Bay Area?

Our most recent data shows that the best time of day to fly to San Francisco Bay Area is in the evening. Flights from Ontario to San Francisco Bay Area during this time can be as low as $119. In contrast, the most expensive time of day to depart to San Francisco Bay Area is in the afternoon when prices are around $354.

What is the cheapest Ontario to San Francisco Bay Area flight route?

Fly from Ontario to San Jose for the best Ontario - San Francisco Bay Area flight prices

How far in advance should I book a flight to San Francisco Bay Area?

You are more likely to see cheaper flights to San Francisco Bay Area from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco Bay Area for around $188 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco Bay Area from Ontario for as low as $129 on momondo.

What cabin class options are available on Ontario to San Francisco Bay Area flights?

There are 4 cabin classes available to choose from on Ontario to San Francisco Bay Area 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 San Francisco Bay Area flights?

No. A direct flight is the cheapest option for a flight between Ontario to San Francisco Bay Area.

Cheap Ontario to San Francisco Bay Area flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Francisco Bay Area

Fastest flight time	1h 10m
Direct flights	Every day
Airports in San Francisco Bay Area	6 airports

The fastest flight from Ontario to San Francisco Bay Area takes 1h 10m

Direct flights go from Ontario to San Francisco Bay Area every day.

There are 6 airports in San Francisco Bay Area. From Ontario there are direct flights to Santa Rosa Sonoma County (STS), Oakland (OAK), San Jose (SJC), San Francisco (SFO).

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Frequently asked questions about flying from Ontario to San Francisco Bay Area

When did momondo last update prices for flights from Ontario Airport to San Francisco Bay Area?
Prices for flights from Ontario Airport to San Francisco Bay Area are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario Airport to San Francisco Bay Area?
There are 5 operators available for flights from Ontario Airport to San Francisco Bay Area as of April 2026.
How old do you have to be to fly from Ontario Airport to San Francisco Bay Area?
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 San Francisco Bay Area.
What documentation or ID do you need to fly to San Francisco Bay Area?
The necessary travel and health documents for your San Francisco Bay Area 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 San Francisco Bay Area?
Based on momondo bookings for flights between Ontario and San Francisco Bay Area, the leading plane model is Airbus A321neo, making up 14.32% of the total bookings. Other popular models include Boeing 737 MAX 8 with 11.69%, Boeing 737-800 Passenger/BBJ2 (winglets) with 11.49%, and Airbus A320neo with 10.43%.

Best airlines flying from Ontario to San Francisco Bay Area

Compare and see reviews for airlines that fly from Ontario to San Francisco Bay Area with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $29	Free Cancellation	Rating 5.7 3,001 reviews	Search Frontier flights
United Airlines	PriceFrom $67	Free Cancellation	Rating 7.4 9,546 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $78	Free Cancellation	Rating 7.9 12,172 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $114	Free Cancellation	Rating 8.0 4,342 reviews	Search Southwest flights
American Airlines	PriceFrom $222	Free Cancellation	Rating 7.1 11,561 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Francisco Bay Area?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to San Francisco Bay Area from Ontario.

Can I find flights from Ontario to San Francisco Bay Area with flexible booking policies on momondo?

All flight searches from Ontario to San Francisco Bay Area on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to San Francisco Bay Area?

momondo helps you find the best flight between Ontario and San Francisco Bay Area by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to San Francisco Bay Area right now. Can momondo alert me if prices change?

If you are simply researching potential flights to San Francisco Bay Area, momondo offers a useful price alert feature which will track prices for flights to San Francisco Bay Area from Ontario and alert you when they change.