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Cheap flights from San Francisco to Ontario from C$ 63

SFO — ONT
2 Nov — 9 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from San Francisco to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from San Francisco to Ontario

Sat 7/117:14 p.m. -
1 stop16h 02m
Mon 9/1112:01 p.m. -
Nonstop1h 35m
Deal found 29/9C$ 157
Tue 27/106:02 a.m. -
1 stop17h 49m
Wed 28/105:07 p.m. -
1 stop19h 45m
Deal found 1/10C$ 159
Wed 28/104:35 p.m. -
Nonstop1h 26m
Wed 4/111:35 p.m. -
Nonstop1h 30m
Deal found 30/9C$ 167
Thu 5/116:04 p.m. -
Nonstop1h 26m
Mon 9/118:35 p.m. -
1 stop11h 44m
Deal found 2/10C$ 172
Mon 23/116:50 p.m. -
Nonstop1h 25m
Tue 1/1211:20 a.m. -
Nonstop1h 30m
Deal found 1/10C$ 195
Thu 5/119:20 p.m. -
Nonstop1h 28m
Wed 11/116:00 a.m. -
Nonstop1h 30m
Deal found 29/9C$ 196
Sat 31/104:35 p.m. -
Nonstop1h 26m
Sat 7/111:35 p.m. -
Nonstop1h 30m
Deal found 3/10C$ 198
Thu 29/105:05 a.m. -
1 stop5h 15m
Mon 2/115:20 p.m. -
1 stop6h 20m
Deal found 29/9C$ 215
Tue 27/105:20 a.m. -
2 stops10h 20m
Wed 28/106:10 a.m. -
1 stop4h 20m
Deal found 1/10C$ 222
Sat 24/109:25 p.m. -
Nonstop1h 26m
Sun 25/106:00 a.m. -
Nonstop1h 30m
Deal found 30/9C$ 225
Mon 9/114:19 p.m. -
Nonstop1h 37m
Thu 12/111:35 p.m. -
Nonstop1h 30m
Deal found 2/10C$ 226

Find flight deals from San Francisco to Ontario

Round-trip from

C$ 157

One-way from

C$ 63

Popular in

February

Cheapest in

August

Average price

C$ 279
Frontier
  • Frontier
  • 7/11-9/11
  • 1 total stop
  • 17h 37m total
  • San Francisco to Ontario
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Frontier
  • Frontier
  • 16/12-31/12
  • Nonstop
  • 1h 27m total
  • San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (C$ 112 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 17 potential savings vs. average RT price).
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Average for round-trip flights in October 2026
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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 FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Tue 5/1

1:50 p.m.-3:27 p.m.

Nonstop1h 37m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 148

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Wed 20/1

4:10 p.m.-5:47 p.m.

Nonstop1h 37m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 148

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Wed 11/11

11:00 a.m.-12:29 p.m.

Nonstop1h 29m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 148

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Fri 4/12

7:10 p.m.-8:38 p.m.

Nonstop1h 28m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 186

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Wed 21/10

5:20 a.m.-3:40 p.m.

2 stops10h 20m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 201
Quickest round-trip

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Tue 27/10

4:35 p.m.-6:01 p.m.

Nonstop1h 26m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 205

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Tue 27/10

6:55 a.m.-10:45 a.m.

1 stop3h 50m

Ontario

Tue 27/10

5:00 p.m.-10:50 p.m.

1 stop5h 50m

C$ 215

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Sat 5/12

5:00 a.m.-12:50 p.m.

2 stops7h 50m

Ontario

Mon 7/12

5:45 a.m.-9:40 a.m.

1 stop3h 55m

C$ 222

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Tue 27/10

5:20 a.m.-3:40 p.m.

2 stops10h 20m

Ontario

Wed 28/10

6:10 a.m.-10:30 a.m.

1 stop4h 20m

C$ 222

San FranciscoOntario

SFO San Francisco - ONT Ontario

SFOONT

San Francisco

Tue 30/3

7:40 a.m.-2:15 p.m.

2 stops6h 35m

Ontario

Wed 31/12

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

Nonstop0h 00m

C$ 235

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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.
Estimated round-trip price

Cheapflights Insights

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

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

The best time to book flights from San Francisco to Ontario is 54 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from San Francisco to Ontario (average of C$ 243). Flying from San Francisco to Ontario in February is currently the most expensive (average of C$ 451). 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 ONT?

When flying from San Francisco to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Airfare is below average for this route at the moment.

San Francisco to Ontario flights typically cost between C$ 188 and C$ 383 in November.
The cheapest round-trip price found within the last 5 days was C$ 157 on Frontier (7 Nov-9 Nov).

Related info for your journey

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

    Flights from San Francisco to Ontario have been viewed 1 times in the past calendar month.

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

    A quick flight from San Francisco to Ontario can take about 3h 50m. Southwest provides one of the quickest options available for as low as C$ 215. San Francisco and Ontario are separated by a distance of 584 km.

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

    Consider Emirates (80%), Air Canada (75%) or SkyWest Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to Ontario.

  • 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 Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Francisco to Ontario (average of C$ 243). Flying from San Francisco to Ontario in February is currently the most expensive (average of C$ 451). 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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Yes! Cheapflights helps users easily find flights from San Francisco to Ontario with no change fees.

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