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$ 203 on WestJet. Other airlines that offer cheap prices include Flair Airlines from C$ 220 and Porter Airlines from C$ 222 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 Region of Waterloo Intl - 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$ 2,622, our data indicates the cheapest price to be C$ 223. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 339.

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: Austrian Airlines (74%), Porter Airlines (69%), Air Transat( 69%).

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 71% by booking at least 57 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$ 606.

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 July. For low rates, February can be a great choice for travel to San Francisco. Flights to San Francisco from Region of Ontario in February are about C$ 596 on average during February, but can be found for as low as C$ 363.

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$ 203+ Flights from Ontario to San Francisco

Cheap flight deals from Ontario to San Francisco

Round-trip from	C$ 340
One-way from	C$ 203
Popular in	July
Cheapest in	February
Average price	C$ 522
Good round-trip deal	C$ 447 or less
Good one-way deal	C$ 274 or less

WestJet
8/5-17/5
2 total stops
18h 01m 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. 12% potential increase in price (C$ 119 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 March 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 28 March 2025.

Thu 8/56:00 a.m.YKF - SFO

1 stop9h 05mWestJet

Sat 17/512:50 p.m.SFO - YKF

1 stop8h 56mWestJet

Deal found 27/3C$ 340

Mon 5/51:30 p.m.YYZ - SFO

1 stop10h 55mWestJet

Fri 9/57:30 a.m.SFO - YYZ

1 stop10h 24mWestJet

Deal found 26/3C$ 342

Fri 2/59:45 a.m.YYZ - SFO

Nonstop5h 45mPorter Airlines

Fri 16/51:30 p.m.SFO - YYZ

Nonstop4h 59mPorter Airlines

Deal found 26/3C$ 343

Tue 1/76:00 a.m.YXU - SFO

2 stops10h 59mWestJet

Wed 30/76:05 p.m.SFO - YXU

1 stop8h 09mWestJet

Deal found 27/3C$ 343

Thu 1/56:00 a.m.YHM - SFO

1 stop9h 05mWestJet

Thu 8/512:50 p.m.SFO - YHM

1 stop8h 51mWestJet

Deal found 26/3C$ 349

Wed 9/47:25 p.m.YYZ - SFO

1 stop15h 20mMultiple Airlines

Wed 16/410:47 a.m.SFO - YYZ

1 stop16h 56mMultiple Airlines

Deal found 27/3C$ 349

Tue 5/85:45 a.m.YOW - SFO

1 stop11h 14mWestJet

Tue 12/812:50 p.m.SFO - YOW

2 stops13h 35mWestJet

Deal found 27/3C$ 354

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

1 stop8h 54mPorter Airlines

Wed 30/41:40 p.m.SFO - YUL

1 stop7h 55mPorter Airlines

Deal found 27/3C$ 366

Wed 4/66:45 a.m.YUL - SFO

2 stops13h 30mWestJet

Tue 12/812:50 p.m.SFO - YUL

1 stop8h 53mWestJet

Deal found 27/3C$ 372

Mon 21/46:15 a.m.YOW - SFO

1 stop9h 24mPorter Airlines

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

1 stop7h 51mPorter Airlines

Deal found 27/3C$ 389

Wed 21/56:45 a.m.YUL - SFO

1 stop8h 45mMultiple Airlines

Wed 28/512:50 p.m.SFO - YUL

1 stop8h 53mMultiple Airlines

Deal found 27/3C$ 402

Sat 3/56:15 a.m.YKF - SFO

2 stops30h 15mFlair Airlines

Tue 6/510:15 a.m.SFO - YKF

2 stops40h 15mFlair Airlines

Deal found 27/3C$ 404

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 28 March 2025.

Thu 8/56:00 a.m.YKF - SFO

1 stop9h 05mWestJet

Sat 17/512:50 p.m.SFO - YKF

1 stop8h 56mWestJet

Deal found 27/3C$ 340

Fri 2/59:45 a.m.YYZ - SFO

Nonstop5h 45mPorter Airlines

Fri 16/51:30 p.m.SFO - YYZ

Nonstop4h 59mPorter Airlines

Deal found 26/3C$ 343

Mon 14/47:25 p.m.YYZ - SFO

1 stop17h 23mMultiple Airlines

Wed 23/48:35 a.m.SFO - YYZ

1 stop18h 20mMultiple Airlines

Deal found 27/3C$ 344

Sat 3/56:15 a.m.YKF - SFO

2 stops30h 15mFlair Airlines

Tue 6/510:15 a.m.SFO - YKF

2 stops40h 15mFlair Airlines

Deal found 27/3C$ 404

Sun 11/59:45 a.m.YYZ - SFO

Nonstop5h 45mAir Transat

Sun 18/51:30 p.m.SFO - YYZ

Nonstop4h 59mAir Transat

Deal found 27/3C$ 440

Fri 18/47:00 p.m.YYZ - SFO

Nonstop5h 49mAir Canada

Mon 21/410:52 p.m.SFO - YYZ

Nonstop5h 08mAir Canada

Deal found 27/3C$ 452

Fri 25/46:55 p.m.YYZ - SFO

Nonstop5h 42mUnited Airlines

Fri 25/412:43 a.m.SFO - YYZ

1 stop7h 47mUnited Airlines

Deal found 27/3C$ 480

Thu 24/412:15 p.m.YYZ - SFO

1 stop9h 45mDelta

Wed 7/56:05 a.m.SFO - YYZ

2 stops14h 09mDelta

Deal found 27/3C$ 496

Wed 25/65:29 p.m.YUL - SFO

2 stops19h 15mAmerican Airlines

Fri 4/79:15 a.m.SFO - YUL

2 stops24h 05mAmerican Airlines

Deal found 28/3C$ 513

Fri 9/56:30 a.m.YYZ - SFO

1 stop10h 29mWestJet

Mon 12/57:30 a.m.SFO - YYZ

1 stop8h 24mWestJet

Deal found 28/3C$ 340

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

1 stop8h 54mPorter Airlines

Wed 30/41:40 p.m.SFO - YUL

1 stop7h 55mPorter Airlines

Deal found 27/3C$ 366

Tue 1/76:00 a.m.YXU - SFO

2 stops10h 59mWestJet

Wed 30/76:05 p.m.SFO - YXU

1 stop8h 09mWestJet

Deal found 27/3C$ 343

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 28 March 2025.

Fri 2/59:45 a.m.YYZ - SFO

Nonstop5h 45mPorter Airlines

Fri 16/51:30 p.m.SFO - YYZ

Nonstop4h 59mPorter Airlines

Deal found 26/3C$ 343

Tue 13/59:45 a.m.YYZ - SFO

Nonstop5h 45mAir Transat

Sat 31/51:30 p.m.SFO - YYZ

Nonstop4h 59mAir Transat

Deal found 26/3C$ 390

Wed 9/46:55 p.m.YYZ - SFO

Nonstop5h 42mAir Canada

Wed 16/49:50 a.m.SFO - YYZ

Nonstop5h 05mAir Canada

Deal found 26/3C$ 402

Fri 18/47:00 p.m.YYZ - SFO

Nonstop5h 49mUnited Airlines

Tue 22/410:52 p.m.SFO - YYZ

Nonstop5h 08mUnited Airlines

Deal found 27/3C$ 480

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

Nonstop6h 25mAir Canada

Wed 28/58:15 a.m.SFO - YUL

Nonstop5h 40mAir Canada

Deal found 27/3C$ 495

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

Nonstop6h 25mUnited Airlines

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

Nonstop5h 40mUnited Airlines

Deal found 27/3C$ 525

Sat 10/54:45 p.m.YUL - SFO

Nonstop6h 25mMultiple Airlines

Sun 11/58:15 a.m.SFO - YUL

Nonstop5h 40mMultiple Airlines

Deal found 28/3C$ 526

Thu 15/56:20 p.m.YYZ - SFO

Nonstop5h 42mMultiple Airlines

Sun 18/58:35 a.m.SFO - YYZ

Nonstop5h 00mMultiple Airlines

Deal found 27/3C$ 533

Mon 21/74:45 p.m.YUL - SFO

Nonstop6h 12mBrussels Airlines

Thu 24/78:20 a.m.SFO - YUL

Nonstop5h 25mBrussels Airlines

Deal found 27/3C$ 1,358

Last-minute flights from Ontario to San Francisco
Discover last-minute flight deals from Ontario to San Francisco. Data last updated 28 March 2025 and is based on user searches.

Wed 2/46:45 a.m.YUL - SFO

2 stops28h 19mMultiple Airlines

Wed 9/41:40 p.m.SFO - YUL

1 stop7h 55mMultiple Airlines

Deal found 27/3C$ 587

Thu 3/46:45 a.m.YUL - SFO

1 stop8h 54mPorter Airlines

Wed 9/41:40 p.m.SFO - YUL

1 stop7h 55mPorter Airlines

Deal found 27/3C$ 420

Thu 3/48:10 p.m.YOW - SFO

2 stops19h 56mWestJet

Sun 20/41:55 p.m.SFO - YOW

2 stops26h 24mWestJet

Deal found 27/3C$ 769

Thu 3/47:30 a.m.YUL - SFO

1 stop11h 05mAir Canada

Wed 9/48:20 a.m.SFO - YUL

Nonstop5h 39mAir Canada

Deal found 27/3C$ 806

Fri 4/41:15 p.m.YUL - SFO

2 stops13h 42mUnited Airlines

Wed 9/46:30 a.m.SFO - YUL

1 stop8h 30mUnited Airlines

Deal found 26/3C$ 706

Fri 4/49:45 a.m.YYZ - SFO

Nonstop5h 54mPorter Airlines

Tue 8/41:40 p.m.SFO - YYZ

Nonstop5h 02mPorter Airlines

Deal found 27/3C$ 816

Fri 4/412:30 p.m.YUL - SFO

2 stops11h 44mAmerican Airlines

Wed 9/411:59 p.m.SFO - YUL

2 stops10h 40mAmerican Airlines

Deal found 26/3C$ 832

Mon 7/47:25 p.m.YYZ - SFO

1 stop17h 23mMultiple Airlines

Thu 10/410:46 a.m.SFO - YYZ

1 stop16h 09mMultiple Airlines

Deal found 27/3C$ 420

Mon 7/47:00 p.m.YYZ - SFO

Nonstop5h 49mAir Canada

Mon 21/410:45 p.m.SFO - YYZ

Nonstop5h 00mAir Canada

Deal found 26/3C$ 662

Mon 7/48:00 a.m.YYZ - SFO

2 stops32h 06mWestJet

Thu 10/41:55 p.m.SFO - YYZ

2 stops30h 35mWestJet

Deal found 27/3C$ 672

Mon 7/44:45 p.m.YYZ - SFO

2 stops20h 57mAlaska Airlines

Wed 9/42:16 p.m.SFO - YYZ

2 stops21h 44mAlaska Airlines

Deal found 27/3C$ 699

Mon 7/47:00 p.m.YYZ - SFO

Nonstop5h 49mUnited Airlines

Wed 9/412:43 a.m.SFO - YYZ

1 stop7h 47mUnited Airlines

Deal found 27/3C$ 749

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 28 March 2025.

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

1 stop9h 05mWestJet

Deal found 28/3C$ 203

Tue 13/56:00 a.m.YOW - SFO

1 stop9h 05mWestJet

Deal found 27/3C$ 210

Sat 3/56:00 a.m.YKF - SFO

1 stop18h 25mWestJet

Deal found 27/3C$ 219

Mon 28/47:25 p.m.YYZ - SFO

1 stop15h 20mMultiple Airlines

Deal found 28/3C$ 219

Mon 28/49:25 a.m.YKF - SFO

1 stop27h 05mFlair Airlines

Deal found 27/3C$ 220

Mon 30/611:00 a.m.YYZ - SFO

1 stop9h 15mWestJet

Deal found 28/3C$ 220

Thu 1/59:45 a.m.YYZ - SFO

Nonstop5h 45mPorter Airlines

Deal found 27/3C$ 222

Sun 17/87:00 a.m.YOW - SFO

1 stop8h 23mPorter Airlines

Deal found 27/3C$ 223

Sun 18/56:45 a.m.YUL - SFO

2 stops13h 30mWestJet

Deal found 27/3C$ 229

Tue 13/56:45 a.m.YUL - SFO

1 stop8h 45mPorter Airlines

Deal found 27/3C$ 230

Mon 28/44:10 p.m.YTZ - SFO

2 stops18h 35mMultiple Airlines

Deal found 28/3C$ 232

Thu 1/59:45 a.m.YYZ - SFO

Nonstop5h 45mAir Transat

Deal found 27/3C$ 233

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

TorontoSan Francisco

YKF - SFO

YKFSFO

Toronto Region of Waterloo Intl

Thu 8/5

6:00 a.m.-12:05 p.m.

1 stop9h 05m

San Francisco

Sat 17/5

12:50 p.m.-12:46 a.m.

1 stop8h 56m

C$ 340

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 9/5

6:30 a.m.-1:59 p.m.

1 stop10h 29m

San Francisco

Mon 12/5

7:30 a.m.-6:54 p.m.

1 stop8h 24m

C$ 340

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Fri 2/5

9:45 a.m.-12:30 p.m.

Nonstop5h 45m

San Francisco

Fri 16/5

1:30 p.m.-9:29 p.m.

Nonstop4h 59m

C$ 343

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 1/7

6:00 a.m.-1:59 p.m.

2 stops10h 59m

San Francisco

Wed 30/7

6:05 p.m.-5:14 a.m.

1 stop8h 09m

C$ 343

TorontoSan Francisco

YYZ - SFO

YYZSFO

Toronto Pearson Intl

Mon 14/4

7:25 p.m.-9:48 a.m.

1 stop17h 23m

San Francisco

Wed 23/4

8:35 a.m.-5:55 a.m.

1 stop18h 20m

C$ 344

HamiltonSan Francisco

YHM - SFO

YHMSFO

Hamilton

Thu 1/5

6:00 a.m.-12:05 p.m.

1 stop9h 05m

San Francisco

Thu 8/5

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

1 stop8h 51m

C$ 349

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Tue 5/8

5:45 a.m.-1:59 p.m.

1 stop11h 14m

San Francisco

Tue 12/8

12:50 p.m.-5:25 a.m.

2 stops13h 35m

C$ 354

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 24/4

6:45 a.m.-12:39 p.m.

1 stop8h 54m

San Francisco

Wed 30/4

1:40 p.m.-12:35 a.m.

1 stop7h 55m

C$ 366

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Wed 4/6

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

2 stops13h 30m

San Francisco

Tue 12/8

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

1 stop8h 53m

C$ 372

OttawaSan Francisco

YOW - SFO

YOWSFO

Ottawa

Mon 21/4

6:15 a.m.-12:39 p.m.

1 stop9h 24m

San Francisco

Fri 2/5

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

1 stop7h 51m

C$ 389

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/3

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 (20 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 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, Delta and Porter Airlines 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

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Alaska Airlines

8.0

Very good

9,798 reviews

Alaska Airlines

8.0

Very good

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Delta

8.0

Very good

7,897 reviews

Alaska Airlines

8.0

Very good

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Porter Airlines

7.9

Good

276 reviews

Alaska Airlines

8.0

Very good

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Air Transat

7.8

Good

381 reviews

Alaska Airlines

8.0

Very good

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

SWISS

7.5

Good

1,570 reviews

Alaska Airlines

8.0

Very good

9,798 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

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$ 203 on WestJet. Other airlines that offer cheap prices include Flair Airlines from C$ 220 and Porter Airlines from C$ 222 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 Region of Waterloo Intl - 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: Austrian Airlines (74%), Porter Airlines (69%), Air Transat( 69%).
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$ 2,622, our data indicates the cheapest price to be C$ 223. The most popular route (Toronto Pearson Intl - San Francisco), is priced around C$ 339.
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

Burlingame

Redwood City

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$ 279	AverageC$ 652	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
WestJet	CheapestC$ 296	AverageC$ 547	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
Air Canada	CheapestC$ 340	AverageC$ 657	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Delta	CheapestC$ 349	AverageC$ 522	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Porter Airlines	CheapestC$ 360	AverageC$ 684	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
United Airlines	CheapestC$ 383	AverageC$ 680	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Transat	CheapestC$ 426	AverageC$ 531	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
Alaska Airlines	CheapestC$ 437	AverageC$ 644	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights
WestJet Encore	CheapestC$ 666	AverageC$ 733	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.

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Cheap flights from Ontario to San Francisco from C$ 203

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 28 March 2025.

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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 28 March 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 28 March 2025.

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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.

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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 28 March 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 28 March 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, Delta and Porter Airlines 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?

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Alternative routes for Ontario to San Francisco

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Top 9 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 28 March 2025.