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Cheap flights from Ontario to San Francisco from C$ 67

ONT — SFO
24 Nov — 1 Dec1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Ontario to San Francisco are usually found in August or October, booked 73 days in advance, depart on a Monday or Tuesday and return on a Monday

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 5/122:53 p.m. -
1 stop4h 44m
Mon 7/129:16 p.m. -
1 stop14h 35m
Deal found 24/10C$ 137
Sat 19/1210:51 p.m. -
1 stop8h 48m
Mon 21/129:46 p.m. -
1 stop10h 15m
Deal found 25/10C$ 154
Tue 8/1211:20 a.m. -
Nonstop1h 30m
Tue 8/124:10 p.m. -
Nonstop1h 26m
Deal found 22/10C$ 160
Sat 14/111:35 p.m. -
Nonstop1h 30m
Mon 16/116:50 p.m. -
Nonstop1h 25m
Deal found 24/10C$ 164
Sat 12/126:00 a.m. -
Nonstop1h 30m
Wed 20/14:10 p.m. -
Nonstop1h 25m
Deal found 23/10C$ 167
Tue 8/125:45 a.m. -
1 stop3h 55m
Tue 8/121:30 p.m. -
2 stops6h 25m
Deal found 22/10C$ 190
Fri 11/126:00 a.m. -
Nonstop1h 30m
Tue 19/14:38 p.m. -
Nonstop1h 25m
Deal found 23/10C$ 195
Wed 9/125:55 a.m. -
2 stops9h 00m
Wed 16/127:00 a.m. -
2 stops9h 10m
Deal found 21/10C$ 197
Sat 5/121:25 p.m. -
1 stop5h 55m
Mon 7/125:05 a.m. -
1 stop7h 05m
Deal found 21/10C$ 199
Fri 25/125:45 a.m. -
1 stop3h 55m
Fri 1/15:05 a.m. -
1 stop4h 15m
Deal found 25/10C$ 211

Find flight deals from Ontario to San Francisco

Round-trip from

C$ 137

One-way from

C$ 67

Popular in

February

Cheapest in

August

Average price

C$ 254

Good one-way deal

C$ 502 or less
Frontier
  • Frontier
  • 5/12-7/12
  • 2 total stops
  • 19h 19m total
  • Ontario to San Francisco
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Frontier
  • Frontier
  • 8/1-31/12
  • Nonstop
  • 1h 31m total
  • Ontario to San Francisco
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Highest demand for flights based on searches. 18% potential increase in price (C$ 99 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 October 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 15/1

5:00 p.m.-11:30 p.m.

2 stops6h 30m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 133
Quickest round-trip

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 23/11

6:00 a.m.-7:30 a.m.

Nonstop1h 30m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 146

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 7/1

6:00 a.m.-7:33 a.m.

Nonstop1h 33m

San Francisco

Sat 9/1

4:10 p.m.-5:35 p.m.

Nonstop1h 25m

C$ 164

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 25/12

12:50 p.m.-8:10 p.m.

2 stops7h 20m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 174

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 28/2

6:00 a.m.-7:39 a.m.

Nonstop1h 39m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 202

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/11

1:35 p.m.-3:05 p.m.

Nonstop1h 30m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 258

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 30/10

5:20 a.m.-9:50 a.m.

1 stop4h 30m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 266

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 3/1

6:00 a.m.-7:33 a.m.

Nonstop1h 33m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 266

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 19/12

6:00 a.m.-7:33 a.m.

Nonstop1h 33m

San Francisco

Sat 19/12

9:30 p.m.-10:53 p.m.

Nonstop1h 23m

C$ 268

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 6/2

7:00 a.m.-4:41 p.m.

2 stops9h 41m

San Francisco

Wed 31/12

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

Nonstop0h 00m

C$ 279

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/10

Showing 1-10 of 22 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, August is the cheapest month in which you can book a flight from Ontario to San Francisco (average of C$ 226). Flying from Ontario to San Francisco in February is currently the most expensive (average of C$ 430). 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 below average for this route at the moment.

Ontario to San Francisco flights typically cost between C$ 181 and C$ 377 in December.
The cheapest round-trip price found within the last 5 days was C$ 137 on Frontier (5 Dec-7 Dec).

Related info for your journey

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

    Within the past month, 6 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 33m. Fly via United Airlines to get the fastest option. The distance from Ontario to San Francisco is about 584 km. All flights are typically direct.

  • 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 (88%), SkyWest Airlines (73%) or United Airlines (70%) 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$ 502, our data shows the cheapest flight currently is C$ 360. When looking at the most popular route, (Ontario - San Francisco), you can expect to pay C$ 76 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, August is the cheapest month in which you can book a flight from Ontario to San Francisco (average of C$ 226). Flying from Ontario to San Francisco in February is currently the most expensive (average of C$ 430). 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
San Bruno
Burlingame
Roseville
Livermore
South San Francisco
Novato
Manteca
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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