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

For as low as C$ 490, United Airlines can have you in Region of Ontario from San Francisco in 6h 31m. Airlines will cover a distance of 3626 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 San Francisco to Region of Ontario one-way?

One-way options have recently been found by users for as low as C$ 175 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 189 and Air Transat from C$ 203 one-way.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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

Most travellers choose San Francisco - Toronto Pearson Intl, San Francisco - Montreal Pierre Elliott Trudeau Intl or San Francisco - Toronto Island when deciding on the best route from San Francisco to Region of Ontario.

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

Looking for the cheapest flight from San Francisco to Region of Ontario? While on average our users pay C$ 441, our data indicates the cheapest price to be C$ 200. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 332.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Region of Ontario on time: United Airlines (78%), Brussels Airlines (74%), Air Canada (73%).

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

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

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

San Francisco (SFO) is the airport you will fly out of if you book a flight from San Francisco to Ontario. It is only a 17.7 km journey to San Francisco (SFO) from San Francisco’s city centre.

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

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

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

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

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

Yes. Cheapflights offers flight deals from San Francisco to Ontario 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 San Francisco to Ontario

Cheap flight deals from San Francisco to Ontario

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from San Francisco to Ontario
Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Fri 4/121:45 p.m. -

Nonstop4h 57m

Thu 10/129:50 a.m. -

Nonstop5h 57m

Deal found 25/10C$ 367

Sat 5/121:45 p.m. -

Nonstop4h 57m

Thu 10/129:50 a.m. -

Nonstop5h 57m

Deal found 23/10C$ 368

Thu 3/121:45 p.m. -

Nonstop4h 57m

Tue 8/129:50 a.m. -

Nonstop5h 57m

Deal found 25/10C$ 371

Mon 7/121:45 p.m. -

Nonstop4h 57m

Mon 14/129:50 a.m. -

Nonstop5h 57m

Deal found 23/10C$ 380

Sat 5/121:45 p.m. -

Nonstop4h 57m

Fri 11/129:50 a.m. -

Nonstop5h 57m

Deal found 23/10C$ 381

Sun 6/122:00 p.m. -

Nonstop4h 49m

Sun 13/129:50 a.m. -

Nonstop5h 57m

Deal found 22/10C$ 382

Thu 3/1210:35 a.m. -

1 stop17h 17m

Sat 5/129:50 a.m. -

Nonstop5h 57m

Deal found 25/10C$ 384

Thu 12/114:40 p.m. -

Nonstop4h 49m

Wed 18/116:40 p.m. -

Nonstop5h 50m

Deal found 22/10C$ 387

Thu 3/128:25 a.m. -

Nonstop4h 49m

Sat 12/1210:20 a.m. -

Nonstop5h 50m

Deal found 21/10C$ 388

Thu 12/111:45 p.m. -

Nonstop4h 58m

Wed 18/119:50 a.m. -

Nonstop5h 54m

Deal found 22/10C$ 389

Thu 5/111:45 p.m. -

Nonstop4h 58m

Wed 11/119:50 a.m. -

Nonstop5h 54m

Deal found 21/10C$ 392

Sat 28/111:45 p.m. -

Nonstop4h 58m

Sat 5/129:50 a.m. -

Nonstop5h 57m

Deal found 24/10C$ 394

Best flights from San Francisco to Ontario
Discover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Sun 22/1110:45 p.m. -

1 stop8h 02m

Sat 12/126:30 a.m. -

Nonstop5h 59m

Deal found 21/10C$ 468

Wed 16/121:36 p.m. -

1 stop6h 31m

Sat 9/16:30 a.m. -

1 stop9h 20m

Deal found 25/10C$ 490

Sun 6/124:55 p.m. -

2 stops14h 00m

Sun 13/1210:35 a.m. -

1 stop8h 05m

Deal found 21/10C$ 597

Fri 11/1211:10 p.m. -

1 stop7h 57m

Mon 14/1212:30 p.m. -

1 stop12h 03m

Deal found 22/10C$ 630

Fri 4/129:40 a.m. -

1 stop27h 25m

Mon 7/125:15 p.m. -

2 stops20h 35m

Deal found 21/10C$ 693

Mon 16/111:45 p.m. -

1 stop7h 52m

Thu 19/117:00 a.m. -

1 stop8h 44m

Deal found 23/10C$ 786

Mon 8/31:45 p.m. -

1 stop7h 56m

Tue 9/37:00 a.m. -

1 stop8h 50m

Deal found 25/10C$ 793

Sun 15/1110:45 p.m. -

1 stop8h 02m

Thu 19/115:10 p.m. -

Nonstop5h 53m

Deal found 23/10C$ 469

Fri 13/119:20 p.m. -

2 stops9h 27m

Sun 15/115:55 p.m. -

1 stop9h 58m

Deal found 22/10C$ 504

Sun 6/1211:40 p.m. -

1 stop7h 27m

Mon 14/1210:45 a.m. -

1 stop13h 48m

Deal found 23/10C$ 644

Thu 10/124:55 p.m. -

2 stops14h 00m

Thu 17/1210:35 a.m. -

1 stop8h 05m

Deal found 25/10C$ 667

Wed 18/116:35 a.m. -

1 stop7h 07m

Sun 22/113:20 p.m. -

1 stop9h 09m

Deal found 23/10C$ 578

Wed 4/116:59 p.m. -

2 stops18h 06m

Sat 7/115:15 p.m. -

2 stops18h 45m

Deal found 21/10C$ 710

Sat 9/17:09 p.m. -

2 stops11h 58m

Sun 17/18:20 a.m. -

2 stops16h 13m

Deal found 23/10C$ 667

Thu 19/116:15 a.m. -

1 stop9h 42m

Sun 22/113:20 p.m. -

1 stop9h 09m

Deal found 21/10C$ 578

Tue 8/124:55 p.m. -

2 stops14h 00m

Tue 15/1210:35 a.m. -

2 stops13h 58m

Deal found 24/10C$ 713

Mon 2/1111:44 a.m. -

1 stop9h 15m

Fri 6/115:49 p.m. -

1 stop6h 57m

Deal found 22/10C$ 786

Sat 21/1110:08 p.m. -

2 stops14h 57m

Mon 23/115:15 p.m. -

1 stop8h 31m

Deal found 25/10C$ 724

Sun 15/1111:20 p.m. -

1 stop16h 37m

Thu 19/118:30 a.m. -

1 stop16h 03m

Deal found 23/10C$ 688

Tue 8/128:50 p.m. -

2 stops10h 17m

Thu 10/1212:05 p.m. -

1 stop8h 50m

Deal found 21/10C$ 585

Mon 14/121:45 p.m. -

1 stop7h 56m

Thu 7/17:00 a.m. -

1 stop8h 45m

Deal found 23/10C$ 859

Wed 4/113:08 p.m. -

1 stop21h 57m

Sun 8/115:15 p.m. -

2 stops18h 45m

Deal found 21/10C$ 789

Thu 10/121:45 p.m. -

1 stop7h 56m

Thu 17/1212:15 p.m. -

2 stops13h 19m

Deal found 26/10C$ 955

Sun 6/1210:44 p.m. -

2 stops12h 48m

Sun 13/1210:05 a.m. -

2 stops13h 03m

Deal found 22/10C$ 737

Wed 11/117:51 p.m. -

2 stops10h 56m

Fri 27/1110:20 a.m. -

Nonstop5h 50m

Deal found 23/10C$ 657

Wed 3/36:00 a.m. -

2 stops14h 40m

Tue 9/35:30 a.m. -

2 stops11h 57m

Deal found 25/10C$ 965

Fri 4/122:34 p.m. -

2 stops22h 31m

Tue 8/125:15 p.m. -

1 stop20h 47m

Deal found 24/10C$ 835

Mon 23/116:35 a.m. -

1 stop7h 07m

Wed 25/1110:45 a.m. -

1 stop13h 48m

Deal found 25/10C$ 768

Sat 5/1212:41 p.m. -

1 stop8h 18m

Sat 12/126:30 a.m. -

Nonstop5h 59m

Deal found 21/10C$ 658

Fri 22/16:00 a.m. -

2 stops14h 40m

Wed 10/25:30 a.m. -

2 stops16h 18m

Deal found 24/10C$ 965

Find flight deals from San Francisco to Ontario

Round-trip from	C$ 367
One-way from	C$ 211
Popular in	December
Cheapest in	January
Average price	C$ 697
Good round-trip deal	C$ 274 or less
Good one-way deal	C$ 263 or less

Porter Airlines
4/12-10/12
Nonstop
10h 54m total
San Francisco to Ontario

Search Deals

United Airlines
17/11-31/12
2 total stops
10h 43m total
San Francisco to Ontario

Search Deals

High demand for flights, 3% potential price rise

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 October 2026

Search Deals

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

Search Deals

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

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Mon 7/12

7:51 p.m.-9:47 a.m.

2 stops10h 56m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 211

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Sun 15/11

6:47 p.m.-4:05 p.m.

2 stops18h 18m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 220

Quickest round-trip

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Sat 5/12

1:36 p.m.-11:07 p.m.

1 stop6h 31m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 227

San FranciscoToronto

SFO San Francisco - YTZ Toronto Island

SFOYTZ

San Francisco

Tue 22/12

9:46 p.m.-12:50 p.m.

2 stops36h 04m

Toronto Island

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 235

San FranciscoToronto

SFO San Francisco - YTZ Toronto Island

SFOYTZ

San Francisco

Sun 6/12

11:40 p.m.-10:07 a.m.

1 stop7h 27m

Toronto Island

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 240

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Thu 12/11

10:50 p.m.-3:26 p.m.

1 stop13h 36m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 241

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Thu 17/12

6:20 a.m.-10:51 p.m.

1 stop13h 31m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 242

San FranciscoToronto

SFO San Francisco - YTZ Toronto Island

SFOYTZ

San Francisco

Sun 15/11

6:15 a.m.-6:57 p.m.

1 stop9h 42m

Toronto Island

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 242

San FranciscoToronto

SFO San Francisco - YTZ Toronto Island

SFOYTZ

San Francisco

Tue 24/11

5:00 a.m.-4:42 p.m.

1 stop8h 42m

Toronto Island

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 242

San FranciscoToronto

SFO San Francisco - YTZ Toronto Island

SFOYTZ

San Francisco

Thu 19/11

6:15 a.m.-6:57 p.m.

1 stop9h 42m

Toronto Island

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 242

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from San Francisco to Ontario

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

SFO-YYZ

SFO-YTZ

SFO-YQG

SFO-YOW

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 San Francisco to Ontario

SFO-CAON

SFO-YYZ

SFO-YTZ

SFO-YQG

SFO-YOW

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

Currently, January is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of C$ 543). Flying from San Francisco to Region of Ontario in December is currently the most expensive (average of C$ 835). 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 SFO to ON?

It’s optimal to fly from San Francisco to Region of Ontario at noon. By choosing this option you can save up to 30% on the cost of your flight, compared to a flight in the evening.

Weekly flight availability from San Francisco to Region of Ontario

The most flights from SFO to CAON are scheduled on a Sunday (20 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

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

Airfare is below average for this route at the moment.

San Francisco to Region of Ontario flights typically cost between C$ 556 and C$ 946 in December.
The cheapest round-trip price found within the last 5 days was C$ 367 on Porter Airlines (4 Dec-10 Dec).

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

The price you pay for your flight from San Francisco to Region of Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 44 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

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

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Porter Airlines,United Airlines, andWestJet from San Francisco to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Porter Airlines

8.0

Very good

467 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

United Airlines

7.3

Good

10,444 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

WestJet

7.2

Good

3,445 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Air Canada

7.1

Good

11,818 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Related info for your journey

What airport do you fly from for flights from San Francisco to Ontario?
San Francisco (SFO) is the airport you will fly out of if you book a flight from San Francisco to Ontario. It is only a 17.7 km journey to San Francisco (SFO) from San Francisco’s city centre.
How long is the flight from San Francisco to Region of Ontario?
For as low as C$ 490, United Airlines can have you in Region of Ontario from San Francisco in 6h 31m. Airlines will cover a distance of 3626 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 San Francisco to Region of Ontario one-way?
One-way options have recently been found by users for as low as C$ 175 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 189 and Air Transat from C$ 203 one-way.
What are the most popular routes from San Francisco to Region of Ontario?
Most travellers choose San Francisco - Toronto Pearson Intl, San Francisco - Montreal Pierre Elliott Trudeau Intl or San Francisco - Toronto Island when deciding on the best route from San Francisco to Region of Ontario.
What are the most reliable airlines from San Francisco to Region of Ontario?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Region of Ontario on time: United Airlines (78%), Brussels Airlines (74%), Air Canada (73%).
What are the cheapest flights from San Francisco to Region of Ontario?
Looking for the cheapest flight from San Francisco to Region of Ontario? While on average our users pay C$ 441, our data indicates the cheapest price to be C$ 200. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 332.
Can I find deals for flights from San Francisco to Ontario that include hotel bookings?
Yes. In addition to deals on San Francisco to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Francisco to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ontario.
Can I find deals for business class flights from San Francisco to Ontario?
Yes. Cheapflights offers flight deals from San Francisco to Ontario 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 San Francisco to Region of Ontario?
Currently, January is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of C$ 543). Flying from San Francisco to Region of Ontario in December is currently the most expensive (average of C$ 835). 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

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Alternative routes

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Alternative routes for San Francisco to Ontario

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Top 4 airlines flying from San Francisco to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	CheapestC$ 267	AverageC$ 797	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Porter Airlines	CheapestC$ 292	AverageC$ 593	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
WestJet	CheapestC$ 564	AverageC$ 749	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
United Airlines	CheapestC$ 573	AverageC$ 869	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

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

When you search for this flight from San Francisco to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from San Francisco to Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes, we can. To see specific flights from San Francisco to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes, Cheapflights offers price alerts on San Francisco to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from San Francisco to Ontario 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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from San Francisco to Ontario

Cheapest flights from San Francisco to OntarioExplore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Best flights from San Francisco to OntarioDiscover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Discover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Direct flights from San Francisco to OntarioExplore direct flight options from San Francisco to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 26 October 2026.

Explore direct flight options from San Francisco to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 26 October 2026.

Last-minute flights from San Francisco to OntarioDiscover last-minute flight deals from San Francisco to Ontario. Data last updated 26 October 2026 and is based on user searches.

Discover last-minute flight deals from San Francisco to Ontario. Data last updated 26 October 2026 and is based on user searches.

One-way flights from San Francisco to OntarioSearch for one-way flight options from San Francisco to Ontario. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.

Search for one-way flight options from San Francisco to Ontario. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.

Find flight deals from San Francisco to Ontario

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 San Francisco to Ontario that are best for you.

Best time to book a flight from San Francisco to Ontario

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

Cheapflights Insights

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

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

Find hourly flight availability from San Francisco to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 October 2026.

It’s optimal to fly from San Francisco to Region of Ontario at noon. By choosing this option you can save up to 30% on the cost of your flight, compared to a flight in the evening.

Weekly flight availability from San Francisco to Region of Ontario

The most flights from SFO to CAON are scheduled on a Sunday (20 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

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

Airfare is below average for this route at the moment.

San Francisco to Region of Ontario flights typically cost between C$ 556 and C$ 946 in December.The cheapest round-trip price found within the last 5 days was C$ 367 on Porter Airlines (4 Dec-10 Dec).

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

The price you pay for your flight from San Francisco to Region of Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 44 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ontario. Price data was last updated on 24 October 2026.

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

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Porter Airlines,United Airlines, andWestJet from San Francisco to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

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Alternative routes for San Francisco to Ontario

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

Complete your trip

Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to Canada

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San Francisco and Ontario flights

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Top 4 airlines flying from San Francisco to Ontario

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Cheapest flights from San Francisco to Ontario
Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Best flights from San Francisco to Ontario
Discover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Direct flights from San Francisco to Ontario
Explore direct flight options from San Francisco to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 26 October 2026.

Last-minute flights from San Francisco to Ontario
Discover last-minute flight deals from San Francisco to Ontario. Data last updated 26 October 2026 and is based on user searches.

One-way flights from San Francisco to Ontario
Search for one-way flight options from San Francisco to Ontario. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.

San Francisco to Region of Ontario flights typically cost between C$ 556 and C$ 946 in December.
The cheapest round-trip price found within the last 5 days was C$ 367 on Porter Airlines (4 Dec-10 Dec).