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$ 173 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 204 and Air Canada from C$ 226 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 Hamilton - 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$ 1,658, our data indicates the cheapest price to be C$ 208. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 268.

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: Porter Airlines (79%), Air Transat (79%), Air Canada( 65%).

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

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

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

Find a great deal and save up to 76% by booking at least 47 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Region of Ontario to San Francisco within the next two weeks, with the cheapest ticket starting at C$ 589.

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

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, March can be a great choice for travel to San Francisco. Flights to San Francisco from Region of Ontario in March are about C$ 564 on average during March, but can be found for as low as C$ 337.

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

Located just 19.0 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$ 173+ Flights from Ontario to San Francisco

Cheap flight deals from Ontario to San Francisco

Round-trip from	C$ 294
One-way from	C$ 173
Popular in	December
Cheapest in	March
Average price	C$ 464
Good round-trip deal	C$ 464 or less
Good one-way deal	C$ 265 or less

7/5-13/5
4 total stops
34h 10m total
Ontario to San Francisco

Search Deals

WestJet
24/6
1 total stop
9h 05m total
Ontario to San Francisco

Search Deals

Highest demand for flights based on searches. 1% potential increase in price (C$ 8 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

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

Find flight deals from Ontario to San Francisco

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 17 April 2025.

Wed 7/56:00 a.m.YHM - SFO

2 stops20h 59mMultiple Airlines

Tue 13/58:30 a.m.SFO - YHM

2 stops13h 11mMultiple Airlines

Deal found 15/4C$ 294

Thu 7/86:00 a.m.YHM - SFO

1 stop8h 56mWestJet

Mon 11/812:50 p.m.SFO - YHM

1 stop8h 51mWestJet

Deal found 16/4C$ 327

Thu 3/76:30 a.m.YYZ - SFO

1 stop10h 29mWestJet

Thu 10/77:30 a.m.SFO - YYZ

1 stop10h 24mWestJet

Deal found 15/4C$ 337

Sun 1/66:00 a.m.YOW - SFO

1 stop9h 05mWestJet

Sun 8/66:05 p.m.SFO - YOW

1 stop9h 40mWestJet

Deal found 17/4C$ 347

Sun 7/96:00 a.m.YKF - SFO

1 stop8h 54mWestJet

Wed 10/912:50 p.m.SFO - YKF

1 stop8h 55mWestJet

Deal found 17/4C$ 351

Tue 13/52:00 p.m.YYZ - SFO

2 stops26h 03mMultiple Airlines

Sat 24/55:45 a.m.SFO - YYZ

1 stop15h 27mMultiple Airlines

Deal found 16/4C$ 352

Sat 10/56:45 a.m.YUL - SFO

1 stop8h 45mPorter Airlines

Mon 26/51:30 p.m.SFO - YUL

1 stop8h 07mPorter Airlines

Deal found 16/4C$ 355

Mon 5/57:00 a.m.YOW - SFO

1 stop8h 30mPorter Airlines

Wed 14/51:30 p.m.SFO - YOW

1 stop7h 51mPorter Airlines

Deal found 16/4C$ 355

Fri 25/76:45 a.m.YUL - SFO

2 stops13h 30mWestJet

Wed 6/812:50 p.m.SFO - YUL

1 stop8h 53mWestJet

Deal found 16/4C$ 356

Sat 10/59:40 a.m.YUL - SFO

2 stops14h 22mAir Canada

Mon 26/57:40 p.m.SFO - YUL

1 stop9h 05mAir Canada

Deal found 16/4C$ 360

Thu 1/54:30 p.m.YUL - SFO

Nonstop6h 25mUnited Airlines

Wed 7/511:12 a.m.SFO - YUL

1 stop9h 14mUnited Airlines

Deal found 17/4C$ 377

Thu 11/96:00 a.m.YOW - SFO

1 stop8h 11mAir Canada

Mon 15/98:30 a.m.SFO - YOW

1 stop8h 44mAir Canada

Deal found 17/4C$ 377

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 17 April 2025.

Wed 7/56:00 a.m.YHM - SFO

2 stops20h 59mMultiple Airlines

Tue 13/58:30 a.m.SFO - YHM

2 stops13h 11mMultiple Airlines

Deal found 15/4C$ 294

Thu 3/76:30 a.m.YYZ - SFO

1 stop10h 29mWestJet

Thu 10/77:30 a.m.SFO - YYZ

1 stop10h 24mWestJet

Deal found 15/4C$ 337

Thu 1/56:45 a.m.YUL - SFO

1 stop8h 45mPorter Airlines

Wed 7/51:30 p.m.SFO - YUL

1 stop8h 07mPorter Airlines

Deal found 16/4C$ 351

Sat 10/59:40 a.m.YUL - SFO

2 stops14h 22mAir Canada

Mon 26/57:40 p.m.SFO - YUL

1 stop9h 05mAir Canada

Deal found 16/4C$ 360

Thu 1/58:10 a.m.YUL - SFO

Nonstop6h 25mUnited Airlines

Tue 6/512:10 a.m.SFO - YUL

1 stop8h 45mUnited Airlines

Deal found 17/4C$ 377

Thu 1/58:10 a.m.YUL - SFO

Nonstop6h 25mLufthansa

Wed 7/58:15 a.m.SFO - YUL

Nonstop5h 40mLufthansa

Deal found 17/4C$ 391

Mon 19/56:00 a.m.YUL - SFO

1 stop7h 33mDelta

Tue 27/511:59 p.m.SFO - YUL

1 stop8h 40mDelta

Deal found 16/4C$ 440

Fri 23/58:25 p.m.YKF - SFO

1 stop16h 05mFlair Airlines

Sun 25/510:15 a.m.SFO - YKF

1 stop30h 10mFlair Airlines

Deal found 15/4C$ 444

Sun 18/57:47 a.m.YUL - SFO

2 stops19h 35mAmerican Airlines

Wed 28/56:30 p.m.SFO - YUL

2 stops14h 51mAmerican Airlines

Deal found 16/4C$ 476

Wed 23/44:45 p.m.YYZ - SFO

1 stop8h 28mAlaska Airlines

Fri 25/45:35 p.m.SFO - YYZ

2 stops18h 25mAlaska Airlines

Deal found 16/4C$ 538

Tue 15/76:00 a.m.YHM - SFO

2 stops10h 59mWestJet

Thu 31/712:50 p.m.SFO - YHM

1 stop8h 51mWestJet

Deal found 16/4C$ 338

Tue 13/52:00 p.m.YYZ - SFO

2 stops26h 03mMultiple Airlines

Sat 24/55:45 a.m.SFO - YYZ

1 stop15h 27mMultiple Airlines

Deal found 16/4C$ 352

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 17 April 2025.

Thu 1/54:30 p.m.YUL - SFO

Nonstop6h 25mAir Canada

Wed 7/58:15 a.m.SFO - YUL

Nonstop5h 40mAir Canada

Deal found 17/4C$ 363

Wed 7/59:45 a.m.YYZ - SFO

Nonstop5h 45mPorter Airlines

Tue 13/51:30 p.m.SFO - YYZ

Nonstop4h 59mPorter Airlines

Deal found 16/4C$ 383

Thu 1/58:10 a.m.YUL - SFO

Nonstop6h 25mLufthansa

Wed 7/58:15 a.m.SFO - YUL

Nonstop5h 40mLufthansa

Deal found 17/4C$ 391

Wed 21/58:10 a.m.YUL - SFO

Nonstop6h 25mUnited Airlines

Tue 27/511:25 a.m.SFO - YUL

Nonstop5h 40mUnited Airlines

Deal found 16/4C$ 395

Thu 24/46:20 p.m.YUL - SFO

Nonstop6h 25mMultiple Airlines

Thu 1/511:25 a.m.SFO - YUL

Nonstop5h 40mMultiple Airlines

Deal found 17/4C$ 417

Wed 4/66:20 p.m.YYZ - SFO

Nonstop5h 42mAir Canada

Wed 11/64:50 p.m.SFO - YYZ

Nonstop5h 01mAir Canada

Deal found 17/4C$ 427

Wed 30/49:45 a.m.YYZ - SFO

Nonstop5h 54mAir Transat

Thu 1/51:30 p.m.SFO - YYZ

Nonstop4h 59mAir Transat

Deal found 16/4C$ 492

Thu 24/49:45 a.m.YYZ - SFO

Nonstop5h 54mMultiple Airlines

Fri 2/51:30 p.m.SFO - YYZ

Nonstop4h 59mMultiple Airlines

Deal found 17/4C$ 585

Tue 1/76:30 a.m.YYZ - SFO

Nonstop5h 37mUnited Airlines

Sat 12/74:50 p.m.SFO - YYZ

Nonstop4h 54mUnited Airlines

Deal found 16/4C$ 600

Mon 21/46:20 p.m.YUL - SFO

Nonstop6h 25mBrussels Airlines

Mon 28/48:20 a.m.SFO - YUL

Nonstop5h 39mBrussels Airlines

Deal found 16/4C$ 1,201

Last-minute flights from Ontario to San Francisco
Discover last-minute flight deals from Ontario to San Francisco. Data last updated 17 April 2025 and is based on user searches.

Tue 22/412:10 p.m.YYZ - SFO

1 stop11h 42mDelta

Tue 29/47:05 a.m.SFO - YYZ

1 stop13h 02mDelta

Deal found 15/4C$ 482

Wed 23/49:45 a.m.YYZ - SFO

Nonstop5h 54mMultiple Airlines

Wed 30/41:45 p.m.SFO - YYZ

2 stops13h 29mMultiple Airlines

Deal found 16/4C$ 394

Wed 23/42:45 p.m.YOW - SFO

1 stop10h 00mAir Canada

Sun 27/410:52 p.m.SFO - YOW

1 stop7h 22mAir Canada

Deal found 16/4C$ 421

Wed 23/49:45 a.m.YYZ - SFO

Nonstop5h 54mPorter Airlines

Wed 7/51:30 p.m.SFO - YYZ

Nonstop4h 59mPorter Airlines

Deal found 16/4C$ 430

Wed 23/46:30 a.m.YYZ - SFO

Nonstop5h 49mAir Canada

Wed 7/512:35 p.m.SFO - YYZ

1 stop8h 34mAir Canada

Deal found 16/4C$ 446

Wed 23/44:45 p.m.YYZ - SFO

2 stops18h 17mAlaska Airlines

Wed 7/55:35 p.m.SFO - YYZ

2 stops18h 25mAlaska Airlines

Deal found 16/4C$ 528

Wed 23/42:30 p.m.YUL - SFO

2 stops12h 28mAmerican Airlines

Thu 24/411:59 p.m.SFO - YUL

2 stops19h 55mAmerican Airlines

Deal found 16/4C$ 541

Wed 23/45:55 a.m.YOW - SFO

2 stops16h 05mDelta

Sun 27/47:10 a.m.SFO - YOW

2 stops14h 12mDelta

Deal found 16/4C$ 541

Thu 24/46:45 a.m.YUL - SFO

1 stop8h 54mPorter Airlines

Thu 1/51:30 p.m.SFO - YUL

1 stop8h 07mPorter Airlines

Deal found 17/4C$ 370

Thu 24/46:20 p.m.YUL - SFO

Nonstop6h 25mMultiple Airlines

Thu 1/511:25 a.m.SFO - YUL

Nonstop5h 40mMultiple Airlines

Deal found 17/4C$ 417

Thu 24/46:20 p.m.YUL - SFO

Nonstop6h 25mUnited Airlines

Wed 30/48:20 a.m.SFO - YUL

Nonstop5h 39mUnited Airlines

Deal found 16/4C$ 446

Sun 27/46:30 a.m.YYZ - SFO

1 stop7h 38mAmerican Airlines

Wed 30/411:59 p.m.SFO - YYZ

1 stop19h 50mAmerican Airlines

Deal found 16/4C$ 502

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 17 April 2025.

Tue 24/66:00 a.m.YKF - SFO

1 stop9h 05mWestJet

Deal found 16/4C$ 173

Wed 2/76:00 a.m.YHM - SFO

1 stop9h 05mWestJet

Deal found 17/4C$ 197

Sun 15/66:10 a.m.YOW - SFO

2 stops14h 05mWestJet

Deal found 16/4C$ 202

Sun 18/57:00 a.m.YOW - SFO

1 stop8h 30mPorter Airlines

Deal found 16/4C$ 204

Tue 24/66:30 a.m.YYZ - SFO

1 stop8h 35mWestJet

Deal found 16/4C$ 204

Fri 23/510:30 p.m.YYZ - SFO

3 stops25h 49mMultiple Airlines

Deal found 17/4C$ 219

Thu 12/66:45 a.m.YUL - SFO

1 stop8h 45mPorter Airlines

Deal found 16/4C$ 222

Wed 28/53:45 p.m.YOW - SFO

2 stops23h 39mMultiple Airlines

Deal found 16/4C$ 222

Wed 30/49:45 a.m.YYZ - SFO

Nonstop5h 54mPorter Airlines

Deal found 16/4C$ 222

Fri 9/56:00 a.m.YHM - SFO

3 stops30h 48mMultiple Airlines

Deal found 16/4C$ 225

Tue 6/59:10 a.m.YUL - SFO

1 stop9h 25mAir Canada

Deal found 16/4C$ 226

Thu 12/66:45 a.m.YUL - SFO

2 stops13h 30mWestJet

Deal found 16/4C$ 229

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

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Thu 7/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

San Francisco

Mon 11/8

12:50 p.m.-12:41 a.m.

1 stop8h 51m

C$ 326

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Sun 1/6

6:10 a.m.-5:15 p.m.

2 stops14h 05m

San Francisco

Sun 8/6

6:05 p.m.-6:45 a.m.

1 stop9h 40m

C$ 347

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 1/5

6:45 a.m.-12:30 p.m.

1 stop8h 45m

San Francisco

Wed 7/5

1:30 p.m.-12:37 a.m.

1 stop8h 07m

C$ 351

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Sun 7/9

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Wed 10/9

12:50 p.m.-12:45 a.m.

1 stop8h 55m

C$ 351

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Sat 24/5

11:00 a.m.-5:15 p.m.

1 stop9h 15m

San Francisco

Sun 1/6

6:05 p.m.-6:12 a.m.

1 stop9h 07m

C$ 351

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Tue 13/5

2:00 p.m.-1:03 p.m.

2 stops26h 03m

San Francisco

Sat 24/5

5:45 a.m.-12:12 a.m.

1 stop15h 27m

C$ 352

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Mon 5/5

7:00 a.m.-12:30 p.m.

1 stop8h 30m

San Francisco

Wed 14/5

1:30 p.m.-12:21 a.m.

1 stop7h 51m

C$ 355

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Sat 10/5

9:40 a.m.-9:02 p.m.

2 stops14h 22m

San Francisco

Mon 26/5

7:40 p.m.-7:45 a.m.

1 stop9h 05m

C$ 360

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Mon 2/6

6:45 a.m.-5:15 p.m.

2 stops13h 30m

San Francisco

Wed 4/6

12:50 p.m.-12:43 a.m.

1 stop8h 53m

C$ 366

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 1/5

4:30 p.m.-7:55 p.m.

Nonstop6h 25m

San Francisco

Wed 7/5

11:12 a.m.-11:26 p.m.

1 stop9h 14m

C$ 377

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/4

Showing 1-10 of 60 results

...

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.

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

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$ 276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of C$ 379). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to San Francisco as you normally would.

Weekly flight availability from Region of Ontario to San Francisco

The most flights from CAON to SFO are scheduled on a Wednesday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).

Rainfall in San Francisco by month

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.

Temperature in San Francisco by month

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).

Reviews of airlines servicing San Francisco

Read reviews from past customers who have flown Alaska Airlines, Porter Airlines and Delta from Ontario to San Francisco. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,887 reviews

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Porter Airlines

8.0

Very good

281 reviews

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,916 reviews

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Air Transat

7.8

Good

385 reviews

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,667 reviews

Alaska Airlines

8.0

Very good

9,887 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

What airport do you fly into for flights to San Francisco from Ontario?
Located just 19.0 km from the city centre, San Francisco (SFO) is the airport most travelers will use when flying to San Francisco from Ontario.
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$ 173 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 204 and Air Canada from C$ 226 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 Hamilton - 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: Porter Airlines (79%), Air Transat (79%), Air Canada( 65%).
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$ 1,658, our data indicates the cheapest price to be C$ 208. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 268.
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$ 276). Flying from Region of Ontario to San Francisco in June is currently the most expensive (average of C$ 379). 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

Richmond

San Ramon

Newark

Alameda

Redwood City

Burlingame

South San Francisco

San Bruno

Scotts Valley

Novato

Belmont

Millbrae

Santa Clara

Vallejo

Browse thousands of different options on Cheapflights for your next trip

Top 9 airlines flying from Ontario to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	CheapestC$ 271	AverageC$ 632	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
WestJet	CheapestC$ 287	AverageC$ 495	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
Air Canada	CheapestC$ 330	AverageC$ 618	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Delta	CheapestC$ 338	AverageC$ 503	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Porter Airlines	CheapestC$ 348	AverageC$ 643	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
United Airlines	CheapestC$ 358	AverageC$ 653	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Transat	CheapestC$ 414	AverageC$ 515	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
Alaska Airlines	CheapestC$ 424	AverageC$ 625	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights
WestJet Encore	CheapestC$ 646	AverageC$ 703	FlexibilityNo cancel fee	On-timeN/A	Search WestJet Encore 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Ontario to San Francisco from C$ 173

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/6. 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

Keep the following information in mind while searching for Ontario to San Francisco flight deals. Data was last updated 17 April 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find 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 17 April 2025.

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 17 April 2025.

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

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

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 17 April 2025.

Weekly flight availability from Region of Ontario to San Francisco

Explore weekly flight availability from Ontario to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 April 2025.

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

Reviews of airlines servicing San Francisco

Read reviews from past customers who have flown Alaska Airlines, Porter Airlines and Delta from Ontario to San Francisco. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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 Ontario?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.

Top 9 airlines flying from Ontario to San Francisco

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 17 April 2025.