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

For as low as C$ 535, WestJet can have you in Region of Ontario from San Francisco in 7h 32m. Airlines will cover a distance of 3367 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$ 117 on WestJet. Other airlines that offer cheap prices include Air Transat from C$ 174 and Porter Airlines from C$ 182 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$ 720, our data indicates the cheapest price to be C$ 217. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 420.

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: Brussels Airlines (71%), Air Canada (67%), United Airlines (67%).

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

Consider Porter Airlines, Air Canada 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$ 166+ 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 11 September 2026.

Sun 18/106:00 a.m. -

1 stop8h 15m

Thu 22/1012:25 p.m. -

2 stops12h 30m

Deal found 6/9C$ 370

Thu 8/106:00 a.m. -

1 stop8h 15m

Thu 15/1012:25 p.m. -

2 stops12h 30m

Deal found 10/9C$ 381

Tue 6/106:00 a.m. -

1 stop8h 15m

Tue 13/108:15 p.m. -

1 stop18h 45m

Deal found 9/9C$ 409

Mon 19/106:00 a.m. -

1 stop8h 15m

Wed 28/107:00 a.m. -

1 stop8h 45m

Deal found 9/9C$ 410

Fri 2/106:00 a.m. -

1 stop10h 20m

Wed 7/107:20 a.m. -

1 stop17h 35m

Deal found 10/9C$ 419

Sun 18/106:00 a.m. -

1 stop8h 15m

Fri 23/108:15 p.m. -

1 stop18h 45m

Deal found 9/9C$ 420

Wed 7/106:05 p.m. -

1 stop8h 30m

Wed 14/106:55 a.m. -

2 stops12h 45m

Deal found 9/9C$ 421

Mon 26/101:45 p.m. -

1 stop7h 50m

Mon 2/116:45 a.m. -

2 stops12h 05m

Deal found 11/9C$ 459

Mon 26/108:25 a.m. -

1 stop7h 20m

Mon 2/1110:35 a.m. -

1 stop8h 05m

Deal found 11/9C$ 467

Tue 29/96:00 a.m. -

1 stop8h 15m

Tue 6/106:10 p.m. -

1 stop20h 50m

Deal found 7/9C$ 479

Wed 30/96:00 a.m. -

2 stops10h 55m

Wed 14/103:50 p.m. -

1 stop9h 05m

Deal found 11/9C$ 484

Mon 26/1010:39 a.m. -

2 stops30h 41m

Mon 2/119:35 a.m. -

1 stop9h 15m

Deal found 11/9C$ 485

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 11 September 2026.

Sun 18/106:00 a.m. -

1 stop8h 15m

Thu 22/1012:25 p.m. -

2 stops12h 30m

Deal found 6/9C$ 370

Tue 29/98:30 a.m. -

1 stop7h 32m

Thu 1/107:45 p.m. -

2 stops22h 36m

Deal found 7/9C$ 535

Thu 22/108:58 a.m. -

2 stops17h 37m

Tue 27/107:00 a.m. -

1 stop8h 45m

Deal found 8/9C$ 539

Tue 17/1111:53 a.m. -

2 stops25h 12m

Fri 20/115:15 p.m. -

1 stop8h 31m

Deal found 7/9C$ 670

Mon 26/101:45 p.m. -

Nonstop4h 54m

Mon 2/119:50 a.m. -

Nonstop5h 55m

Deal found 11/9C$ 703

Tue 13/108:10 a.m. -

Nonstop5h 04m

Sun 18/106:30 a.m. -

Nonstop5h 38m

Deal found 7/9C$ 743

Wed 21/106:05 p.m. -

1 stop8h 30m

Fri 23/108:15 p.m. -

1 stop18h 45m

Deal found 11/9C$ 426

Tue 6/106:00 a.m. -

1 stop8h 15m

Tue 13/106:15 p.m. -

2 stops30h 40m

Deal found 9/9C$ 446

Fri 2/106:00 a.m. -

1 stop10h 20m

Wed 7/106:55 a.m. -

2 stops18h 00m

Deal found 10/9C$ 452

Tue 20/104:30 p.m. -

2 stops12h 55m

Thu 22/108:20 p.m. -

2 stops22h 01m

Deal found 9/9C$ 575

Thu 22/106:00 a.m. -

1 stop7h 45m

Thu 29/107:40 a.m. -

2 stops27h 39m

Deal found 6/9C$ 601

Tue 13/1010:51 p.m. -

1 stop7h 31m

Tue 27/1010:35 a.m. -

1 stop13h 55m

Deal found 9/9C$ 575

Thu 22/106:00 a.m. -

1 stop7h 45m

Thu 29/107:40 a.m. -

1 stop12h 10m

Deal found 6/9C$ 499

Wed 18/116:59 p.m. -

2 stops18h 06m

Sun 22/115:15 p.m. -

2 stops18h 46m

Deal found 8/9C$ 677

Sun 18/106:00 a.m. -

3 stops15h 20m

Thu 22/1010:00 a.m. -

2 stops14h 55m

Deal found 6/9C$ 616

Fri 2/106:45 p.m. -

2 stops17h 35m

Mon 5/108:15 p.m. -

1 stop18h 45m

Deal found 7/9C$ 622

Sat 31/1011:00 a.m. -

1 stop27h 05m

Tue 3/115:15 p.m. -

2 stops25h 25m

Deal found 8/9C$ 685

Thu 15/106:00 a.m. -

1 stop8h 15m

Thu 22/106:10 p.m. -

1 stop20h 50m

Deal found 6/9C$ 520

Sun 25/108:10 a.m. -

Nonstop4h 58m

Sun 1/116:10 a.m. -

1 stop9h 09m

Deal found 10/9C$ 764

Tue 17/1110:43 a.m. -

2 stops26h 22m

Sat 21/115:15 p.m. -

2 stops21h 22m

Deal found 8/9C$ 692

Thu 15/101:00 p.m. -

1 stop25h 15m

Fri 23/101:20 p.m. -

1 stop25h 40m

Deal found 10/9C$ 521

Fri 25/1211:27 p.m. -

Nonstop5h 03m

Thu 31/124:10 p.m. -

1 stop17h 43m

Deal found 10/9C$ 764

Thu 1/101:00 p.m. -

1 stop20h 55m

Tue 6/108:15 p.m. -

1 stop18h 45m

Deal found 7/9C$ 656

Fri 23/104:30 p.m. -

2 stops13h 52m

Mon 26/107:20 p.m. -

1 stop18h 45m

Deal found 8/9C$ 765

Sat 21/116:55 p.m. -

2 stops11h 52m

Thu 26/116:45 a.m. -

2 stops10h 53m

Deal found 11/9C$ 799

Tue 20/106:00 a.m. -

1 stop20h 20m

Thu 22/106:10 a.m. -

1 stop8h 50m

Deal found 10/9C$ 546

Tue 13/106:00 a.m. -

1 stop14h 13m

Sun 18/1011:45 a.m. -

2 stops13h 10m

Deal found 6/9C$ 699

Sat 30/17:00 p.m. -

2 stops18h 05m

Fri 26/25:15 p.m. -

2 stops18h 40m

Deal found 8/9C$ 776

Thu 22/106:00 a.m. -

1 stop8h 15m

Sun 25/104:25 p.m. -

1 stop27h 25m

Deal found 9/9C$ 558

Fri 9/106:00 a.m. -

1 stop14h 13m

Fri 16/106:05 a.m. -

2 stops14h 55m

Deal found 11/9C$ 703

Find flight deals from San Francisco to Ontario

Round-trip from	C$ 380
One-way from	C$ 166
Popular in	December
Cheapest in	January
Average price	C$ 752
Good round-trip deal	C$ 521 or less
Good one-way deal	C$ 350 or less

WestJet
18/10-22/10
3 total stops
20h 45m total
San Francisco to Ontario

Search Deals

WestJet
6/10-31/12
1 total stop
10h 20m total
San Francisco to Ontario

Search Deals

High demand for flights, 3% potential price rise

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 20 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 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 FranciscoOttawa

SFO San Francisco - YOW Ottawa

SFOYOW

San Francisco

Tue 6/10

6:00 a.m.-7:20 p.m.

1 stop10h 20m

Ottawa

Wed 31/12

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

Nonstop0h 00m

C$ 166

San FranciscoOttawa

SFO San Francisco - YOW Ottawa

SFOYOW

San Francisco

Tue 6/10

4:21 p.m.-5:35 a.m.

3 stops58h 14m

Ottawa

Wed 31/12

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

Nonstop0h 00m

C$ 202

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Wed 16/9

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

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

Nonstop0h 00m

C$ 210

San FranciscoOttawa

SFO San Francisco - YOW Ottawa

SFOYOW

San Francisco

Sun 4/10

10:24 p.m.-5:35 a.m.

3 stops28h 11m

Ottawa

Wed 31/12

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

Nonstop0h 00m

C$ 216

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Thu 22/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

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

Nonstop0h 00m

C$ 225

San FranciscoWindsor

SFO San Francisco - YQG Windsor

SFOYQG

San Francisco

Wed 30/9

4:40 p.m.-9:22 a.m.

1 stop13h 42m

Windsor

Wed 31/12

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

Nonstop0h 00m

C$ 227

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Mon 19/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

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

Nonstop0h 00m

C$ 227

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Sun 4/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

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

Nonstop0h 00m

C$ 227

San FranciscoOttawa

SFO San Francisco - YOW Ottawa

SFOYOW

San Francisco

Thu 1/10

12:07 p.m.-5:35 a.m.

3 stops38h 28m

Ottawa

Wed 31/12

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

Nonstop0h 00m

C$ 229

San FranciscoWindsor

SFO San Francisco - YQG Windsor

SFOYQG

San Francisco

Fri 25/9

6:00 a.m.-3:10 p.m.

1 stop30h 10m

Windsor

Wed 31/12

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

Nonstop0h 00m

C$ 234

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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-YOW

SFO-YUL

SFO-YQG

SFO-YXU

SFO-YKF

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-YOW

SFO-YUL

SFO-YQG

SFO-YXU

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

Currently, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of C$ 542). Flying from San Francisco to Region of Ontario in December is currently the most expensive (average of C$ 857). 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 24% 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 Thursday (27 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (20 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$ 566 and C$ 899 in September.
The cheapest round-trip price found within the last 5 days was C$ 484 on WestJet (30 Sep-14 Oct).

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,Air Transat, andUnited Airlines 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

460 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

460 reviews

Porter Airlines

8.0

Very good

460 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 Transat

7.7

Good

579 reviews

Porter Airlines

8.0

Very good

460 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

7.4

Good

10,197 reviews

Porter Airlines

8.0

Very good

460 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

460 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

11,611 reviews

Porter Airlines

8.0

Very good

460 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$ 535, WestJet can have you in Region of Ontario from San Francisco in 7h 32m. Airlines will cover a distance of 3367 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$ 117 on WestJet. Other airlines that offer cheap prices include Air Transat from C$ 174 and Porter Airlines from C$ 182 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: Brussels Airlines (71%), Air Canada (67%), United Airlines (67%).
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$ 720, our data indicates the cheapest price to be C$ 217. The most popular route (San Francisco - Toronto Pearson Intl), is priced around C$ 420.
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, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of C$ 542). Flying from San Francisco to Region of Ontario in December is currently the most expensive (average of C$ 857). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

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Alternative routes for San Francisco to Ontario

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Top 5 airlines flying from San Francisco to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Air Transat	CheapestC$ 277	AverageC$ 828	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
Air Canada	CheapestC$ 293	AverageC$ 778	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Porter Airlines	CheapestC$ 298	AverageC$ 585	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
United Airlines	CheapestC$ 534	AverageC$ 857	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
WestJet	CheapestC$ 557	AverageC$ 739	FlexibilityNo cancel fee	On-time60%	Search WestJet 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$ 166

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 6/10. 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 11 September 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 11 September 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 11 September 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 11 September 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 11 September 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 11 September 2026.

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

Discover last-minute flight deals from San Francisco to Ontario. Data last updated 11 September 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 11 September 2026.

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

It’s optimal to fly from San Francisco to Region of Ontario at noon. By choosing this option you can save up to 24% 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 Thursday (27 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (20 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$ 566 and C$ 899 in September.The cheapest round-trip price found within the last 5 days was C$ 484 on WestJet (30 Sep-14 Oct).

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 5 September 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,Air Transat, andUnited Airlines 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.

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Alternative routes for 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 11 September 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 11 September 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 11 September 2026.

Last-minute flights from San Francisco to Ontario
Discover last-minute flight deals from San Francisco to Ontario. Data last updated 11 September 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 11 September 2026.

San Francisco to Region of Ontario flights typically cost between C$ 566 and C$ 899 in September.
The cheapest round-trip price found within the last 5 days was C$ 484 on WestJet (30 Sep-14 Oct).