How does KAYAK find such low prices on flights from Ontario to San Francisco?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Francisco. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to San Francisco?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Ontario is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Ontario to San Francisco?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Ontario with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to San Francisco?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$164 CHEAP FLIGHTS from Ontario to San Francisco

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

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Flight Deals

Cheap Flights from Ontario to San Francisco

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Ontario to San Francisco

Sat, Oct 18 - Fri, Oct 24

6:00 am - 11:54 amYHM-SFO

8h 54m1 stop

12:50 pm - 12:40 amSFO-YHM

8h 50m1 stop

$284WestJet

Find Deal

Tue, Sep 30 - Thu, Oct 2

6:00 am - 11:54 amYHM-SFO

8h 54m1 stop

10:15 am - 11:59 pmSFO-YHM

10h 44m1 stop

$285

Find Deal

Sun, Sep 7 - Wed, Sep 17

9:00 am - 8:06 amYYZ-SFO

26h 06m2 stops

8:00 am - 7:58 pmSFO-YYZ

8h 58m1 stop

$286

Find Deal

Tue, Nov 11 - Tue, Nov 18

9:45 am - 12:40 pmYYZ-SFO

5h 55mnonstop

1:40 pm - 9:37 pmSFO-YYZ

4h 57mnonstop

$301Porter Airlines

Find Deal

Thu, Nov 27 - Sun, Nov 30

9:45 am - 12:40 pmYYZ-SFO

5h 55mnonstop

1:40 pm - 9:37 pmSFO-YYZ

4h 57mnonstop

$318Porter Airlines

Find Deal

Tue, Nov 11 - Tue, Nov 18

3:30 pm - 9:22 pmYTZ-SFO

8h 52m1 stop

8:25 am - 7:55 pmSFO-YTZ

8h 30m1 stop

$320Air Canada

Find Deal

Mon, Oct 20 - Tue, Oct 28

12:25 pm - 7:51 pmYTZ-SFO

10h 26m1 stop

8:25 am - 7:55 pmSFO-YTZ

8h 30m1 stop

$324Air Canada

Find Deal

Fri, Oct 31 - Sat, Nov 8

4:45 pm - 11:50 pmYYZ-SFO

10h 05m1 stop

7:37 pm - 3:35 pmSFO-YYZ

16h 58m1 stop

$330Alaska Airlines

Find Deal

Thu, Sep 18 - Wed, Sep 24

6:30 pm - 9:40 pmYUL-SFO

6h 10mnonstop

11:45 pm - 8:16 amSFO-YUL

5h 31mnonstop

$364United Airlines

Find Deal

Thu, Sep 18 - Wed, Sep 24

6:30 pm - 9:40 pmYUL-SFO

6h 10mnonstop

5:15 am - 5:26 pmSFO-YUL

9h 11m1 stop

$369United Airlines

Find Deal

Useful Info

Low season	January
High season	December
Cheapest flight	$164

Best time to beat the crowds but there is an average 7% increase in price.

Most popular time to fly with an average 38% increase in price.

Flight from Hamilton to San Francisco

How does KAYAK find such low prices on flights from Ontario to San Francisco?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Francisco.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to San Francisco?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Ontario to San Francisco?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Ontario with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to San Francisco?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Calistoga

Marina

Pacifica

Capitola

Emeryville

Rohnert Park

Millbrae

Campbell

Mill Valley

Newark

Novato

Windsor

Belmont

Los Altos

Union City

Richmond

West Sacramento

Jenner

Corte Madera

American Canyon

Everything you need to know for your flight to San Francisco

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in San Francisco

San Francisco (SFO)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

$164 Find Cheap Flights from Ontario to San Francisco

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

Cheap Flights from Ontario to San Francisco

Recent round-trip flight deals from Ontario to San Francisco

Recent one-way flight deals from Ontario to San Francisco

Recent last minute flight deals from Ontario to San Francisco

Recent direct flight deals from Ontario to San Francisco

Good to know

FAQs for booking flights from Ontario to San Francisco

How does KAYAK find such low prices on flights from Ontario to San Francisco?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to San Francisco.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to San Francisco?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Ontario to San Francisco?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Ontario with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to San Francisco?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near San Francisco?

Everything you need to know for your flight to San Francisco

Information on the airport you'll fly into in San Francisco

Cabin class types available on flights to Ontario

Complete your trip to San Francisco with a hotel stay or car rental

Find direct flights for San Francisco

Flights to other popular destinations

Flights from domestic origins to San Francisco

Choose which airport to fly into in San Francisco

Find deals for your return flight