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>

$126 CHEAP FLIGHTS from Ontario to San Francisco

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

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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

Mon, Oct 27 - Fri, Oct 31

10:15 pm - 12:12 pmYYZ-SFO

16h 57m2 stops

1:00 pm - 12:26 amSFO-YYZ

8h 26m1 stop

$257WestJet

Find Deal

Tue, Nov 11 - Wed, Dec 10

9:45 am - 12:40 pmYYZ-SFO

5h 55mnonstop

2:34 pm - 12:26 amSFO-YYZ

30h 52m2 stops

$258Multiple Airlines

Find Deal

Tue, Oct 28 - Wed, Oct 29

9:45 am - 12:40 pmYYZ-SFO

5h 55mnonstop

1:40 pm - 9:37 pmSFO-YYZ

4h 57mnonstop

$260Porter Airlines

Find Deal

Tue, Dec 2 - Sat, Jan 10

9:45 am - 12:40 pmYYZ-SFO

5h 55mnonstop

1:40 pm - 9:37 pmSFO-YYZ

4h 57mnonstop

$267Porter Airlines

Find Deal

Tue, Nov 25 - Tue, Dec 2

9:45 am - 9:22 pmYQG-SFO

14h 37m2 stops

8:30 am - 7:14 pmSFO-YQG

7h 44m1 stop

$267Air Canada

Find Deal

Tue, Nov 25 - Tue, Dec 2

9:45 am - 9:22 pmYQG-SFO

14h 37m2 stops

6:00 pm - 9:04 amSFO-YQG

12h 04m2 stops

$272Air Canada

Find Deal

Thu, Dec 4 - Mon, Dec 8

11:10 am - 7:37 pmYOW-SFO

11h 27m2 stops

11:55 pm - 1:36 pmSFO-YOW

10h 41m1 stop

$279United Airlines

Find Deal

Sat, Nov 22 - Sun, Nov 30

5:55 pm - 7:50 amYOW-SFO

16h 55m2 stops

11:44 pm - 10:26 amSFO-YOW

7h 42m1 stop

$294United Airlines

Find Deal

Tue, Feb 17 - Sun, Feb 22

6:00 am - 12:10 pmYOW-SFO

9h 10m1 stop

6:00 am - 12:39 amSFO-YOW

15h 39m2 stops

$379Delta

Find Deal

Thu, Nov 6 - Tue, Nov 18

5:40 am - 10:30 pmYOW-SFO

19h 50m2 stops

7:15 am - 12:42 amSFO-YOW

14h 27m2 stops

$391Delta

Find Deal

Cheapest round-trip

$257

Overall average: $369

WestJet

Mon 10/27Fri 10/31

YYZ - SFO • 2 stops

Cheapest non-stop

$260

Typical prices: $346-$523

Porter Airlines

Tue 10/28Wed 10/29

YYZ - SFO • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to San Francisco!

Useful Info

Low season	September
High season	December
Cheapest flight	$126

Best time to beat the crowds with an average 7% drop in price.

Most popular time to fly with an average 44% 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

Capitola

Pacifica

Emeryville

Rohnert Park

Millbrae

Campbell

Mill Valley

Newark

Novato

Windsor

Belmont

Richmond

West Sacramento

Union City

Los Altos

Corte Madera

Jenner

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.

$126 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

Everything you should know

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