How long is the flight from Region of Ontario to San Francisco?

Departing from Region of Ontario to San Francisco will take you 9h. Region of Ontario and San Francisco are separated by a distance of 4073 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to fly from Region of Ontario to San Francisco one-way?

One-way options have recently been found by users for as low as C$ 168 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 211 and Air Transat from C$ 224 one-way.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

What are the most popular routes from Region of Ontario to San Francisco?

While some choose either Montreal Pierre Elliott Trudeau Intl - San Francisco or Toronto Island - San Francisco, Toronto Pearson Intl - San Francisco is the most popular route from Region of Ontario to San Francisco.

What are the cheapest flights from Region of Ontario to San Francisco?

Looking for the cheapest flight from Region of Ontario to San Francisco? While on average our users pay C$ 1,918, our data indicates the cheapest price to be C$ 266. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 395.

What are the most reliable airlines from Region of Ontario to San Francisco?

Before booking your flight to San Francisco from Region of Ontario, check out the most reliable airlines to get you to your destination on time: Singapore Airlines (74%), American Airlines (71%), Porter Airlines( 71%).

What are the most popular airlines that fly from Region of Ontario to San Francisco?

Consider Porter Airlines, Air Canada or United Airlines when booking your flight. These represent the most popular airlines when flying from Region of Ontario to San Francisco.

What airport do you fly into for flights to San Francisco from Ontario?

Located just 17.7 km from the city centre, San Francisco (SFO) is the airport most travelers will use when flying to San Francisco from Ontario.

Can I find deals for flights from Ontario to San Francisco that include hotel bookings?

Yes. In addition to deals on Ontario to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to San Francisco?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Francisco.

Can I find deals for business class flights from Ontario to San Francisco?

Yes. Cheapflights offers flight deals from Ontario to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 211+ Cheap Flights from Ontario to San Francisco

Cheap flight deals from Ontario to San Francisco

Enter your travel dates to find the best prices.

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Best

Direct

Last-minute

One-way

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2026.

Thu 15/1012:25 p.m. -

2 stops12h 30m

Wed 21/106:05 p.m. -

1 stop8h 30m

Deal found 9/9C$ 361

Sat 24/106:10 a.m. -

1 stop8h 50m

Sun 1/114:40 p.m. -

1 stop9h 55m

Deal found 7/9C$ 387

Sun 18/107:20 a.m. -

1 stop17h 35m

Wed 21/106:05 p.m. -

1 stop8h 30m

Deal found 8/9C$ 394

Thu 1/108:15 p.m. -

1 stop28h 40m

Mon 5/106:00 a.m. -

1 stop8h 15m

Deal found 8/9C$ 395

Mon 5/108:15 p.m. -

1 stop18h 45m

Wed 14/106:05 p.m. -

1 stop8h 30m

Deal found 10/9C$ 397

Thu 24/910:05 a.m. -

Nonstop5h 29m

Sun 27/912:05 a.m. -

Nonstop4h 55m

Deal found 9/9C$ 399

Tue 22/91:20 p.m. -

1 stop11h 35m

Wed 23/96:00 a.m. -

1 stop8h 15m

Deal found 8/9C$ 401

Wed 14/1010:00 a.m. -

1 stop9h 40m

Thu 29/105:40 p.m. -

1 stop9h 20m

Deal found 10/9C$ 401

Wed 23/99:00 a.m. -

1 stop10h 40m

Sun 27/96:00 a.m. -

2 stops12h 35m

Deal found 6/9C$ 402

Wed 14/1012:40 p.m. -

2 stops12h 15m

Wed 21/101:00 p.m. -

2 stops13h 10m

Deal found 10/9C$ 403

Mon 7/126:40 a.m. -

1 stop12h 10m

Sun 13/124:40 p.m. -

1 stop9h 55m

Deal found 11/9C$ 403

Wed 14/106:00 a.m. -

1 stop9h 00m

Mon 19/101:00 p.m. -

1 stop8h 10m

Deal found 6/9C$ 405

Best flights from Ontario to San Francisco
Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 11 September 2026.

Mon 7/126:40 a.m. -

1 stop12h 10m

Sun 13/124:40 p.m. -

1 stop9h 55m

Deal found 11/9C$ 403

Sat 10/101:34 p.m. -

1 stop12h 25m

Sun 18/1010:55 p.m. -

1 stop6h 54m

Deal found 6/9C$ 490

Tue 27/106:45 a.m. -

1 stop9h 00m

Thu 29/101:45 p.m. -

1 stop7h 50m

Deal found 9/9C$ 511

Thu 29/108:30 p.m. -

2 stops20h 21m

Sat 31/108:25 a.m. -

2 stops22h 12m

Deal found 7/9C$ 554

Wed 14/106:05 a.m. -

3 stops13h 35m

Mon 19/106:00 a.m. -

1 stop8h 15m

Deal found 6/9C$ 560

Fri 2/1010:05 a.m. -

2 stops10h 15m

Tue 6/105:00 a.m. -

2 stops9h 43m

Deal found 10/9C$ 582

Tue 17/115:15 p.m. -

2 stops18h 45m

Mon 23/114:37 p.m. -

2 stops20h 28m

Deal found 8/9C$ 640

Wed 30/96:10 p.m. -

1 stop30h 45m

Mon 5/106:00 a.m. -

1 stop8h 15m

Deal found 6/9C$ 446

Wed 14/106:10 p.m. -

1 stop20h 50m

Mon 19/106:00 a.m. -

1 stop8h 15m

Deal found 6/9C$ 453

Sat 24/106:45 a.m. -

1 stop8h 35m

Sat 31/101:45 p.m. -

1 stop7h 50m

Deal found 9/9C$ 524

Fri 2/106:34 p.m. -

1 stop8h 23m

Mon 5/109:55 p.m. -

1 stop9h 28m

Deal found 10/9C$ 526

Wed 23/126:30 a.m. -

Nonstop6h 05m

Wed 30/126:30 a.m. -

1 stop10h 27m

Deal found 7/9C$ 560

Thu 17/98:40 p.m. -

1 stop28h 15m

Mon 21/96:00 a.m. -

1 stop10h 50m

Deal found 6/9C$ 477

Wed 28/106:45 a.m. -

1 stop9h 00m

Sun 1/111:45 p.m. -

1 stop7h 50m

Deal found 9/9C$ 533

Wed 16/126:30 a.m. -

Nonstop5h 59m

Tue 29/1211:27 p.m. -

Nonstop5h 03m

Deal found 10/9C$ 609

Wed 30/98:40 p.m. -

1 stop28h 15m

Wed 14/106:05 p.m. -

1 stop17h 55m

Deal found 10/9C$ 576

Thu 8/109:05 a.m. -

2 stops24h 36m

Tue 13/1011:39 p.m. -

2 stops12h 11m

Deal found 9/9C$ 634

Fri 16/106:50 a.m. -

2 stops16h 16m

Tue 27/108:00 a.m. -

2 stops13h 44m

Deal found 10/9C$ 578

Tue 6/106:10 p.m. -

1 stop25h 30m

Tue 13/106:00 a.m. -

1 stop8h 15m

Deal found 10/9C$ 481

Thu 22/106:45 a.m. -

1 stop8h 35m

Sat 24/101:20 p.m. -

1 stop8h 17m

Deal found 8/9C$ 543

Fri 25/127:44 p.m. -

1 stop8h 46m

Thu 7/18:11 a.m. -

Nonstop5h 00m

Deal found 6/9C$ 616

Wed 30/97:00 a.m. -

3 stops17h 55m

Mon 5/106:00 a.m. -

1 stop8h 15m

Deal found 6/9C$ 578

Mon 19/101:20 p.m. -

1 stop25h 40m

Sat 24/101:00 p.m. -

1 stop13h 35m

Deal found 8/9C$ 484

Tue 22/99:45 a.m. -

1 stop7h 21m

Wed 23/912:05 a.m. -

1 stop8h 30m

Deal found 9/9C$ 612

Tue 22/127:26 p.m. -

1 stop8h 33m

Wed 6/111:30 p.m. -

1 stop7h 17m

Deal found 6/9C$ 616

Sun 20/127:26 p.m. -

1 stop8h 33m

Wed 30/126:30 a.m. -

1 stop10h 27m

Deal found 7/9C$ 579

Wed 7/106:55 a.m. -

2 stops18h 00m

Tue 13/106:00 a.m. -

2 stops15h 20m

Deal found 6/9C$ 497

Tue 24/113:35 p.m. -

2 stops10h 31m

Wed 2/129:25 p.m. -

2 stops9h 22m

Deal found 8/9C$ 618

Thu 24/95:54 p.m. -

1 stop9h 05m

Mon 28/96:35 a.m. -

1 stop8h 59m

Deal found 8/9C$ 619

Thu 8/106:30 a.m. -

Nonstop5h 38m

Sun 11/107:30 p.m. -

1 stop10h 30m

Deal found 8/9C$ 596

Find flight deals from Ontario to San Francisco

Round-trip from	C$ 361
One-way from	C$ 211
Popular in	July
Cheapest in	January
Average price	C$ 540
Good round-trip deal	C$ 553 or less
Good one-way deal	C$ 338 or less

WestJet
15/10-21/10
3 total stops
21h 00m total
Ontario to San Francisco

Search Deals

WestJet
18/10-31/12
2 total stops
12h 30m total
Ontario to San Francisco

Search Deals

Highest demand for flights based on searches. 11% potential increase in price (C$ 100 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Price to beat on a round-trip flight from Ontario to San Francisco.

Search Deals

Price to beat on a one-way flight from Ontario to San Francisco.

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSan Francisco

YXU London - SFO San Francisco

YXUSFO

London

Mon 23/11

9:15 a.m.-3:40 p.m.

1 stop9h 25m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 217

LondonSan Francisco

YXU London - SFO San Francisco

YXUSFO

London

Sun 22/11

5:30 a.m.-11:10 a.m.

1 stop8h 40m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 246

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Tue 22/9

6:10 p.m.-4:40 p.m.

1 stop25h 30m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 254

OttawaSan Francisco

YOW Ottawa - SFO San Francisco

YOWSFO

Ottawa

Thu 1/10

8:15 p.m.-9:55 p.m.

1 stop28h 40m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 254

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Tue 15/9

6:10 p.m.-9:55 p.m.

1 stop30h 45m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 271

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Tue 29/9

6:10 p.m.-12:00 p.m.

1 stop20h 50m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 276

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Wed 16/9

6:10 p.m.-9:55 p.m.

1 stop30h 45m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 280

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Fri 18/9

6:10 p.m.-9:55 p.m.

1 stop30h 45m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 280

HamiltonSan Francisco

YHM Hamilton - SFO San Francisco

YHMSFO

Hamilton

Wed 14/10

6:10 p.m.-9:55 p.m.

1 stop30h 45m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 282

TorontoSan Francisco

YYZ Toronto Pearson Intl - SFO San Francisco

YYZSFO

Toronto Pearson Intl

Tue 13/10

2:26 p.m.-10:38 p.m.

1 stop11h 12m

San Francisco

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 286

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from Ontario to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario with our price prediction graph.

YOW-SFO

YXU-SFO

YYZ-SFO

YTZ-SFO

YUL-SFO

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to San Francisco

CAON-SFO

YOW-SFO

YXU-SFO

YYZ-SFO

YTZ-SFO

What is the cheapest month to book a flight from Region of Ontario to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 493). Flying from Region of Ontario to San Francisco in August is currently the most expensive (average of C$ 678). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ON to SFO?

One of the essential ways to save on airfare from Region of Ontario to San Francisco is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 47% on airfare.

Weekly flight availability from Region of Ontario to San Francisco

The most flights from CAON to SFO are scheduled on a Wednesday (26 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (15 on average).

How much does it cost to fly round-trip from Region of Ontario to San Francisco?

Airfare is below average for this route at the moment.

Region of Ontario to San Francisco flights typically cost between C$ 450 and C$ 654 in September.
The cheapest round-trip price found within the last 5 days was C$ 399 on Air Canada (24 Sep-27 Sep).

How far ahead should I book a flight from Region of Ontario to San Francisco?

The best time to book flights from Region of Ontario to San Francisco is 48 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Region of Ontario to San Francisco?

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

What airport do you fly into for flights to San Francisco from Ontario?
Located just 17.7 km from the city centre, San Francisco (SFO) is the airport most travelers will use when flying to San Francisco from Ontario.
How long is the flight from Region of Ontario to San Francisco?
Departing from Region of Ontario to San Francisco will take you 9h. Region of Ontario and San Francisco are separated by a distance of 4073 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from Region of Ontario to San Francisco one-way?
One-way options have recently been found by users for as low as C$ 168 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 211 and Air Transat from C$ 224 one-way.
What are the most popular routes from Region of Ontario to San Francisco?
While some choose either Montreal Pierre Elliott Trudeau Intl - San Francisco or Toronto Island - San Francisco, Toronto Pearson Intl - San Francisco is the most popular route from Region of Ontario to San Francisco.
What are the most reliable airlines from Region of Ontario to San Francisco?
Before booking your flight to San Francisco from Region of Ontario, check out the most reliable airlines to get you to your destination on time: Singapore Airlines (74%), American Airlines (71%), Porter Airlines( 71%).
What are the cheapest flights from Region of Ontario to San Francisco?
Looking for the cheapest flight from Region of Ontario to San Francisco? While on average our users pay C$ 1,918, our data indicates the cheapest price to be C$ 266. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 395.
Can I find deals for flights from Ontario to San Francisco that include hotel bookings?
Yes. In addition to deals on Ontario to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to San Francisco?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Francisco.
Can I find deals for business class flights from Ontario to San Francisco?
Yes. Cheapflights offers flight deals from Ontario to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Region of Ontario to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of C$ 493). Flying from Region of Ontario to San Francisco in August is currently the most expensive (average of C$ 678). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Santa Clara

Burlingame

San Bruno

Roseville

Livermore

South San Francisco

Novato

Manteca

Vallejo

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Québec City to Las Vegas flights

Top 7 airlines flying from Ontario to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
Delta	CheapestC$ 285	AverageC$ 728	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
WestJet	CheapestC$ 294	AverageC$ 466	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
Porter Airlines	CheapestC$ 313	AverageC$ 561	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
American Airlines	CheapestC$ 349	AverageC$ 677	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Air Transat	CheapestC$ 353	AverageC$ 587	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
Air Canada	CheapestC$ 396	AverageC$ 741	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
United Airlines	CheapestC$ 463	AverageC$ 649	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Ontario to San Francisco?

Cheapflights helps you search for flights from Ontario to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Ontario to San Francisco?

Cheapflights helps you find that perfect flight to San Francisco from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to San Francisco with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to San Francisco, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to San Francisco become cheaper?

Yes! Start tracking prices for Ontario to San Francisco flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Ontario to San Francisco from C$ 211

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San FranciscoExplore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2026.

Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2026.

Best flights from Ontario to San FranciscoDiscover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 11 September 2026.

Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 11 September 2026.

Direct flights from Ontario to San FranciscoExplore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 11 September 2026.

Explore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 11 September 2026.

Last-minute flights from Ontario to San FranciscoDiscover last-minute flight deals from Ontario to San Francisco. Data last updated 11 September 2026 and is based on user searches.

Discover last-minute flight deals from Ontario to San Francisco. Data last updated 11 September 2026 and is based on user searches.

One-way flights from Ontario to San FranciscoSearch for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 11 September 2026.

Search for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 11 September 2026.

Find flight deals from Ontario to San Francisco

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

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

Best time to book a flight from Ontario to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from Region of Ontario to San Francisco?

What is the cheapest time of day to fly from ON to SFO?

Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 September 2026.

One of the essential ways to save on airfare from Region of Ontario to San Francisco is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 47% on airfare.

Weekly flight availability from Region of Ontario to San Francisco

The most flights from CAON to SFO are scheduled on a Wednesday (26 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (15 on average).

How much does it cost to fly round-trip from Region of Ontario to San Francisco?

Airfare is below average for this route at the moment.

Region of Ontario to San Francisco flights typically cost between C$ 450 and C$ 654 in September.The cheapest round-trip price found within the last 5 days was C$ 399 on Air Canada (24 Sep-27 Sep).

How far ahead should I book a flight from Region of Ontario to San Francisco?

The best time to book flights from Region of Ontario to San Francisco is 48 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Region of Ontario to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco. Price data was last updated on 5 September 2026.

Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

What airport do you fly into for flights to San Francisco from Ontario?

How long is the flight from Region of Ontario to San Francisco?

What are the cheapest airlines to fly from Region of Ontario to San Francisco one-way?

What are the most popular routes from Region of Ontario to San Francisco?

What are the most reliable airlines from Region of Ontario to San Francisco?

What are the cheapest flights from Region of Ontario to San Francisco?

Can I find deals for flights from Ontario to San Francisco that include hotel bookings?

How can I find direct flights from Ontario to San Francisco?

Can I find deals for business class flights from Ontario to San Francisco?

What is the cheapest month to book a flight from Region of Ontario to San Francisco?

Travelling to a place near San Francisco?

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Alternative routes for Ontario to San Francisco

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Direct flights to California

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Find flights from Ontario to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Ontario and San Francisco flights

Browse other Ontario and San Francisco flight options. Last updated on 11 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Other flights to San Francisco

Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 11 September 2026.

Ontario to San Francisco flights

Consider these flights travelling from Ontario to San Francisco.

Top 7 airlines flying from Ontario to San Francisco

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Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2026.

Best flights from Ontario to San Francisco
Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 11 September 2026.

Direct flights from Ontario to San Francisco
Explore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 11 September 2026.

Last-minute flights from Ontario to San Francisco
Discover last-minute flight deals from Ontario to San Francisco. Data last updated 11 September 2026 and is based on user searches.

One-way flights from Ontario to San Francisco
Search for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 11 September 2026.

Region of Ontario to San Francisco flights typically cost between C$ 450 and C$ 654 in September.
The cheapest round-trip price found within the last 5 days was C$ 399 on Air Canada (24 Sep-27 Sep).