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

Southwest, Frontier, and Alaska 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 day?

The number of flights available between Ontario and San Francisco Bay Area is 15 per day as of May 2026. The most frequent departure time is 6:00PM, with 38% of daily flights leaving at noon.

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 27% 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 week?

The number of flights available between Ontario and San Francisco Bay Area is 107 per week as of May 2026. The most frequent departure day is Thu, with 18% of weekly flights leaving on this day.

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 6 operators available for flights from Ontario Airport to San Francisco Bay Area as of May 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.

$65 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

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:58 am - 10:30 am

ONT

SFO

1h 32mnonstop

11:15 am - 12:53 pm

SFO

ONT

1h 38mnonstop

$105Frontier

Mon, Jul 27 - Tue, Jul 28

8:36 pm - 10:13 pm

ONT

SFO

1h 37mnonstop

9:41 am - 11:13 am

SFO

ONT

1h 32mnonstop

$107Frontier

Tue, Jun 9 - Sun, Jun 21

8:36 pm - 10:13 pm

ONT

SFO

1h 37mnonstop

9:41 am - 11:13 am

SFO

ONT

1h 32mnonstop

$108Frontier

Thu, Jun 11 - Thu, Jun 18

8:39 pm - 10:09 pm

ONT

SFO

1h 30mnonstop

9:28 am - 10:57 am

SFO

ONT

1h 29mnonstop

$109Frontier

Tue, Jul 21 - Sat, Aug 1

6:10 am - 7:25 am

ONT

SJC

1h 15mnonstop

6:30 am - 7:50 am

SJC

ONT

1h 20mnonstop

$137Southwest

Wed, Jun 10 - Wed, Jun 17

6:35 pm - 9:55 pm

ONT

SJC

3h 20m

1 stop

6:30 am - 7:50 am

SJC

ONT

1h 20mnonstop

$147Southwest

Tue, Jun 16 - Wed, Jun 17

5:15 am - 11:25 am

ONT

SJC

6h 10m

2 stops

8:55 pm - 10:10 pm

SJC

ONT

1h 15mnonstop

$152Southwest

Tue, Jul 21 - Tue, Jul 21

6:43 pm - 8:14 pm

ONT

STS

1h 31mnonstop

4:35 pm - 6:03 pm

STS

ONT

1h 28mnonstop

$227Alaska Airlines

Thu, Jun 25 - Sun, Jun 28

3:35 pm - 5:04 pm

ONT

STS

1h 29mnonstop

4:35 pm - 6:03 pm

STS

ONT

1h 28mnonstop

$262Alaska Airlines

Mon, Jun 8 - Wed, Jun 10

6:43 pm - 8:14 pm

ONT

STS

1h 31mnonstop

4:35 pm - 6:03 pm

STS

ONT

1h 28mnonstop

$282Alaska Airlines

Thu, Jun 18 - Sun, Jun 21

Frontier flights from Ontario to San Francisco Bay Area

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

Frontier

Jul 27

ONT8:58 amOntario

1h 32m

SFO10:30 amSan Francisco

Jul 28

SFO11:15 amSan Francisco

1h 38m

ONT12:53 pmOntario

$105

Frontier

Jun 9

ONT8:36 pmOntario

1h 37m

SFO10:13 pmSan Francisco

Jun 21

SFO9:41 amSan Francisco

1h 32m

ONT11:13 amOntario

$107

Frontier

Jun 11

ONT8:36 pmOntario

1h 37m

SFO10:13 pmSan Francisco

Jun 18

SFO9:41 amSan Francisco

1h 32m

ONT11:13 amOntario

$108

Southwest flights from Ontario to San Francisco Bay Area

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

Southwest

Jun 10

ONT6:10 amOntario

1h 15m

SJC7:25 amSan Jose

Jun 17

SJC6:30 amSan Jose

1h 20m

ONT7:50 amOntario

$137

Southwest

Jun 16

ONT6:35 pmOntario

3h 20m

1 stop

SJC9:55 pmSan Jose

Jun 17

SJC6:30 amSan Jose

1h 20m

ONT7:50 amOntario

$147

Southwest

Jul 21

ONT5:15 amOntario

6h 10m

2 stops

SJC11:25 amSan Jose

Jul 21

SJC8:55 pmSan Jose

1h 15m

ONT10:10 pmOntario

$152

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

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 7/27

8:58 am-10:30 am

Nonstop1h 32m

San Francisco

Tue 7/28

11:15 am-12:53 pm

Nonstop1h 38m

$105

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 6/9

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Sun 6/21

9:41 am-11:13 am

Nonstop1h 32m

$107

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 6/11

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Thu 6/18

9:41 am-11:13 am

Nonstop1h 32m

$108

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 7/21

8:39 pm-10:09 pm

Nonstop1h 30m

San Francisco

Sat 8/1

9:28 am-10:57 am

Nonstop1h 29m

$109

Quickest round-trip

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 6/10

6:10 am-7:25 am

Nonstop1h 15m

San Jose

Wed 6/17

6:30 am-7:50 am

Nonstop1h 20m

$137

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 6/16

6:35 pm-9:55 pm

1 stop3h 20m

San Jose

Wed 6/17

6:30 am-7:50 am

Nonstop1h 20m

$147

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 7/21

5:15 am-11:25 am

2 stops6h 10m

San Jose

Tue 7/21

8:55 pm-10:10 pm

Nonstop1h 15m

$152

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 6/25

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sun 6/28

4:35 pm-6:03 pm

Nonstop1h 28m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 6/8

3:35 pm-5:04 pm

Nonstop1h 29m

Santa Rosa Sonoma County

Wed 6/10

4:35 pm-6:03 pm

Nonstop1h 28m

$262

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 6/18

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sun 6/21

4:35 pm-6:03 pm

Nonstop1h 28m

$282

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, April 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 $28. If you aren’t able to travel to San Francisco Bay Area during the month of April, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $31.

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 $195. 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 $381.

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 $127. In contrast, the most expensive time of day to depart to San Francisco Bay Area is in the afternoon when prices are around $375.

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

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

How far in advance should I book a flight from Ontario 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 $200 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 $143 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).

Search flight deals

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 6 operators available for flights from Ontario Airport to San Francisco Bay Area as of May 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 13.71% of the total bookings. Other popular models include Boeing 737 MAX 8 with 12.98%, Airbus A320neo with 11.77%, and Airbus A321-100/200 with 11.77%.

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 5.6 2,945 reviews	Search Frontier flights
United Airlines	PriceFrom $77	Free Cancellation	Rating 7.4 9,751 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $78	Free Cancellation	Rating 7.9 12,395 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $123	Free Cancellation	Rating 7.9 4,278 reviews	Search Southwest flights
JetBlue	PriceFrom $153	Free Cancellation	Rating 7.2 2,981 reviews	Search JetBlue flights
American Airlines	PriceFrom $236	Free Cancellation	Rating 7.1 11,644 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.