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>

$140 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.

Cheapest round-trip

$263

Typical prices: $285-$394

Multiple Airlines

Sun 2/22Wed 2/25

YYZ - SFO • Non-stop

Cheapest non-stop

$262

Typical prices: $321-$465

Porter Airlines

Sat 5/30Thu 6/4

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!

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

Sun, Feb 22 - Wed, Feb 25

9:50 am - 12:45 pm

YYZ

SFO

5h 55mnonstop

7:15 pm - 7:36 pm

SFO

YYZ

21h 21m

2 stops

$263Multiple Airlines

Thu, Feb 19 - Mon, Feb 23

9:50 am - 12:45 pm

YYZ

SFO

5h 55mnonstop

1:45 pm - 9:42 pm

SFO

YYZ

4h 57mnonstop

$264Porter Airlines

Fri, Feb 6 - Sun, Feb 8

3:45 pm - 9:30 am

YYZ

SFO

20h 45m

2 stops

10:15 am - 6:40 am

SFO

YYZ

17h 25m

1 stop

$265Multiple Airlines

Thu, Jan 29 - Mon, Feb 2

5:10 am - 3:35 pm

YXU

SFO

13h 25m

2 stops

6:00 pm - 8:46 am

SFO

YXU

11h 46m

2 stops

$271Air Canada

Thu, Jan 29 - Mon, Feb 2

5:10 am - 3:35 pm

YXU

SFO

13h 25m

2 stops

6:00 pm - 8:46 am

SFO

YXU

11h 46m

2 stops

$274Air Canada

Fri, May 15 - Fri, May 29

3:45 pm - 9:24 pm

YOW

SFO

8h 39m

1 stop

12:50 pm - 12:40 am

SFO

YOW

8h 50m

1 stop

$290WestJet

Tue, Jan 27 - Tue, Feb 3

5:45 am - 12:12 pm

YHM

SFO

9h 27m

1 stop

1:00 pm - 5:16 pm

SFO

YHM

25h 16m

1 stop

$294WestJet

Mon, Feb 23 - Mon, Mar 9

2:25 pm - 11:10 pm

YUL

SFO

11h 45m

1 stop

11:30 am - 12:24 pm

SFO

YUL

21h 54m

2 stops

$343American Airlines

Wed, Mar 4 - Wed, Mar 11

5:50 pm - 9:22 pm

YUL

SFO

6h 32mnonstop

11:20 pm - 12:46 pm

SFO

YUL

10h 26m

1 stop

$345United Airlines

Sun, Feb 1 - Sat, Feb 7

8:25 am - 9:17 pm

YUL

SFO

15h 52m

1 stop

8:25 am - 4:49 pm

SFO

YUL

5h 24mnonstop

$346United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$140

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly and prices are also 21% lower on average.

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

Rohnert Park

Emeryville

Capitola

Pacifica

Millbrae

Campbell

Mill Valley

Newark

Novato

Windsor

Union City

Belmont

Richmond

West Sacramento

Los Altos

Corte Madera

American Canyon

Jenner

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)

$140 Find Cheap Flights from Ontario to San Francisco

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

Everything you should know

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