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Cheap flights from Ontario to San Francisco from C$ 82

ONT — SFO
6 Oct — 13 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to San Francisco

Sat 3/101:52 p.m. -
Nonstop1h 29m
Sat 10/109:25 p.m. -
Nonstop1h 26m
Deal found 3/9C$ 162
Fri 9/106:00 a.m. -
Nonstop1h 27m
Sat 10/109:25 p.m. -
Nonstop1h 26m
Deal found 2/9C$ 185
Sat 21/117:15 a.m. -
Nonstop1h 31m
Wed 25/117:40 a.m. -
Nonstop1h 25m
Deal found 2/9C$ 206
Tue 29/99:40 a.m. -
1 stop6h 20m
Tue 6/105:20 a.m. -
1 stop4h 25m
Deal found 1/9C$ 209
Thu 15/105:15 p.m. -
1 stop6h 05m
Mon 19/102:40 p.m. -
2 stops7h 35m
Deal found 3/9C$ 216
Sat 26/91:52 p.m. -
Nonstop1h 29m
Mon 28/99:25 p.m. -
Nonstop1h 34m
Deal found 3/9C$ 219
Fri 2/106:55 p.m. -
1 stop5h 40m
Mon 5/102:40 p.m. -
2 stops7h 35m
Deal found 1/9C$ 230
Wed 28/1010:55 a.m. -
2 stops10h 10m
Sat 31/105:10 a.m. -
2 stops11h 50m
Deal found 3/9C$ 231
Fri 16/105:15 p.m. -
2 stops7h 25m
Tue 20/1011:05 a.m. -
2 stops8h 35m
Deal found 3/9C$ 237
Fri 23/106:55 p.m. -
1 stop5h 45m
Mon 26/108:40 p.m. -
2 stops11h 10m
Deal found 3/9C$ 238
Wed 30/94:03 p.m. -
Nonstop1h 47m
Wed 30/99:25 p.m. -
Nonstop1h 34m
Deal found 1/9C$ 252

Find flight deals from Ontario to San Francisco

Round-trip from

C$ 162

One-way from

C$ 82

Popular in

February

Cheapest in

October

Average price

C$ 242

Good one-way deal

C$ 263 or less
United Airlines
  • United Airlines
  • 29/9-6/10
  • Nonstop
  • 3h 12m total
  • Ontario to San Francisco
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United Airlines
  • United Airlines
  • 10/11-31/12
  • Nonstop
  • 1h 30m total
  • Ontario to San Francisco
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Highest demand for flights based on searches. 19% potential increase in price (C$ 105 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 16 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a one-way flight from Ontario to San Francisco.
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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 2/10

5:15 p.m.-9:34 a.m.

2 stops16h 19m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 184

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 9/10

6:00 a.m.-7:27 a.m.

Nonstop1h 27m

San Francisco

Sat 10/10

9:25 p.m.-10:51 p.m.

Nonstop1h 26m

C$ 185

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 13/9

6:10 p.m.-11:55 p.m.

1 stop5h 45m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 192

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 18/9

4:50 p.m.-11:30 p.m.

2 stops6h 40m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 199

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 29/10

2:13 p.m.-10:49 p.m.

1 stop8h 36m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 210

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 26/9

1:52 p.m.-3:21 p.m.

Nonstop1h 29m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 213

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 23/9

9:01 a.m.-10:30 a.m.

Nonstop1h 29m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 220

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 22/9

1:56 p.m.-3:25 p.m.

Nonstop1h 29m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 220

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 16/9

1:56 p.m.-3:25 p.m.

Nonstop1h 29m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 220

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 7/10

1:52 p.m.-3:21 p.m.

Nonstop1h 29m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 226

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/9

Showing 1-10 of 23 resultsSorted by cheapest first
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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

Cheapflights Insights

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

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

To ensure you get the cheapest price possible for a flight from Ontario to San Francisco, you should look to book at least 72 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, October is the cheapest month in which you can book a flight from Ontario to San Francisco (average of C$ 190). Flying from Ontario to San Francisco in February is currently the most expensive (average of C$ 423). 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 ONT to SFO?

It’s typically best to fly out from Ontario to San Francisco in the evening. Doing so could potentially save you 79% on the flight price compared to flying at noon, which is usually more expensive.

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

Airfare is typical for this route at the moment.

Ontario to San Francisco flights typically cost between C$ 162 and C$ 328 in September.
The cheapest round-trip price found within the last 5 days was C$ 162 on United Airlines (29 Sep-6 Oct).

Related info for your journey

  • How popular is this Ontario to San Francisco flight route?

    Within the past month, 4 users have taken a look at flights from Ontario to San Francisco.

  • How long is the flight from Ontario to San Francisco?

    There are many flights that can get you from Ontario to San Francisco in 1h 27m. Fly via United Airlines or Southwest to get the fastest option. The distance from Ontario to San Francisco is about 584 km. This flight may include one or multiple stops.

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

    No one likes to see their flight delayed. When booking a flight from Ontario to San Francisco consider choosing Emirates (67%), Air Canada (56%) or United Airlines (54%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Ontario to San Francisco?

    While on average a flight from Ontario to San Francisco is generally C$ 263, our data shows the cheapest flight currently is C$ 263. When looking at the most popular route, (Ontario - San Francisco), you can expect to pay C$ 297 for that flight.

  • 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 Ontario to San Francisco?

    Currently, October is the cheapest month in which you can book a flight from Ontario to San Francisco (average of C$ 190). Flying from Ontario to San Francisco in February is currently the most expensive (average of C$ 423). 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

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Clara
Burlingame
San Bruno
Roseville
Livermore
South San Francisco
Novato
Manteca
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Cheapflights makes it easy to find Ontario to San Francisco flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to San Francisco flexibly with Cheapflights today.

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Not ready to book yet? You can track prices for flights from Ontario to San Francisco on Cheapflights with our Price Alert feature and get notified when better prices are available.

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