How popular is this Ontario to San Francisco flight route?

This flight path from Ontario to San Francisco was viewed by 20 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

How long is the flight from Ontario to San Francisco?

Departing from Ontario to San Francisco will take you 1h 30m. The distance from Ontario to San Francisco is about 363 mi. Both multi-stop and direct flights can be found to your destination and back.

Weekly flight availability from Ontario to San Francisco

The most flights from ONT to SFO are scheduled on a Wednesday (11 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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

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 Ontario to San Francisco on time: Emirates (82%), Air Canada (64%), SkyWest Airlines (62%).

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 holiday 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.

£32+ Cheap Flights from Ontario to San Francisco

Cheapflights Tip: The best prices from Ontario to San Francisco are usually found in October or August, booked 73 days in advance, depart on a Tuesday or Monday and return on a Monday

Cheap flight deals from Ontario to San Francisco

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.

Wed 4/1113:35 -

Nonstop1h 30m

Wed 4/1118:50 -

Nonstop1h 25m

Deal found 4/10£86

Sat 7/1113:35 -

Nonstop1h 30m

Tue 10/1116:35 -

Nonstop1h 26m

Deal found 6/10£90

Sat 7/1105:45 -

1 stop3h 40m

Tue 10/1110:25 -

1 stop5h 45m

Deal found 7/10£99

Sat 7/1113:35 -

Nonstop1h 30m

Mon 9/1116:19 -

Nonstop1h 37m

Deal found 7/10£105

Sat 7/1113:25 -

1 stop6h 00m

Mon 9/1115:15 -

1 stop6h 45m

Deal found 7/10£107

Fri 30/1013:35 -

Nonstop1h 30m

Tue 3/1116:35 -

Nonstop1h 26m

Deal found 9/10£109

Wed 18/1106:00 -

Nonstop1h 30m

Sun 22/1111:00 -

Nonstop1h 29m

Deal found 5/10£110

Tue 3/1115:50 -

1 stop4h 40m

Sat 7/1105:50 -

2 stops7h 40m

Deal found 6/10£111

Tue 3/1117:00 -

1 stop4h 20m

Tue 10/1107:00 -

1 stop4h 55m

Deal found 4/10£114

Find flight deals from Ontario to San Francisco

Round-trip from	£86
One-way from	£32
Popular in	February
Cheapest in	October
Average price	£114
Good round-trip deal	£141 or less

United Airlines
4/11-4/11
Nonstop
2h 55m total
Ontario to San Francisco

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Frontier
22/11-31/12
Nonstop
1h 33m total
Ontario to San Francisco

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (£31 potential increase over avg. return price).

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Cheapest flight prices on average. 3% potential price decrease (£5 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Price to beat on a round-trip 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 return flight

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 6/11

07:00-11:30

1 stop4h 30m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£58

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 6/12

05:00-11:25

2 stops6h 25m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£72

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 25/12

05:55-12:20

1 stop6h 25m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£73

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sun 22/11

05:00-11:25

2 stops6h 25m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£76

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 25/11

18:30-00:30

1 stop6h 00m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£80

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 26/11

09:25-10:55

Nonstop1h 30m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£86

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/11

13:35-15:05

Nonstop1h 30m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£94

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 16/12

18:40-20:10

Nonstop1h 30m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£94

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 26/11

05:50-09:25

1 stop3h 35m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£94

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 23/11

06:00-07:30

Nonstop1h 30m

San Francisco

Wed 31/12

00:00-00:00

Nonstop0h 00m

£99

Flights are sorted by cheapest return flights first.

Deals found on 6/10

Showing 1-10 of 22 resultsSorted by cheapest first

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.

ONT-SFO

Estimated return 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 Ontario to San Francisco

Prices

Airlines

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

The best time to book flights from Ontario to San Francisco is 72 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 Ontario to San Francisco?

Currently, October is the cheapest month in which you can book a flight from Ontario to San Francisco (average of £114). Flying from Ontario to San Francisco in February is currently the most expensive (average of £232). 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?

One of the essential ways to save on airfare from Ontario to San Francisco is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 93% on airfare.

How much does it cost for a return flight from Ontario to San Francisco?

Airfare is below average for this route at the moment.

Ontario to San Francisco flights typically cost between £88 and £174 in November.
The cheapest return price found within the last 5 days was £86 on United Airlines (4 Nov–4 Nov).

Related info for your journey

How popular is this Ontario to San Francisco flight route?
This flight path from Ontario to San Francisco was viewed by 20 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from Ontario to San Francisco?
Departing from Ontario to San Francisco will take you 1h 30m. The distance from Ontario to San Francisco is about 363 mi. Both multi-stop and direct flights can be found to your destination and back.
What are the most reliable airlines from Ontario to San Francisco?
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 Ontario to San Francisco on time: Emirates (82%), Air Canada (64%), SkyWest Airlines (62%).
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 holiday 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 £114). Flying from Ontario to San Francisco in February is currently the most expensive (average of £232). 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.

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Bodega Bay

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

When you search for this flight from Ontario to San Francisco, 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 Ontario to San Francisco?

Cheapflights simply makes it quick and affordable to book flights from Ontario to San Francisco by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to San Francisco, users can toggle the no change fees filter when performing a flight search.

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

Of course! You can now track prices for flights from Ontario to San Francisco and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from Ontario to San Francisco from £32

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 22/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San FranciscoExplore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.

Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.

Best flights from Ontario to San FranciscoDiscover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 October 2026.

Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 October 2026.

Direct flights from Ontario to San FranciscoExplore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 9 October 2026.

Explore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 9 October 2026.

Last-minute flights from Ontario to San FranciscoDiscover last-minute flight deals from Ontario to San Francisco. Data last updated 9 October 2026 and is based on user searches.

Discover last-minute flight deals from Ontario to San Francisco. Data last updated 9 October 2026 and is based on user searches.

One-way flights from Ontario to San FranciscoSearch for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 9 October 2026.

Search for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 9 October 2026.

Find flight deals from Ontario to San Francisco

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Cheapflights Fare Finder

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

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.

Cheapflights Insights

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

The best time to book flights from Ontario to San Francisco is 72 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 Ontario to San Francisco?

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

One of the essential ways to save on airfare from Ontario to San Francisco is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 93% on airfare.

How much does it cost for a return flight from Ontario to San Francisco?

Airfare is below average for this route at the moment.

Ontario to San Francisco flights typically cost between £88 and £174 in November.The cheapest return price found within the last 5 days was £86 on United Airlines (4 Nov–4 Nov).

Weekly flight availability from Ontario to San Francisco

The most flights from ONT to SFO are scheduled on a Wednesday (11 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Related info for your journey

How popular is this Ontario to San Francisco flight route?

How long is the flight from Ontario to San Francisco?

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

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

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

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

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

Travelling to a place near San Francisco?

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Alternative routes for Ontario to San Francisco

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

Complete your trip

Complete your trip to San Francisco by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to California

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Search flights from Ontario to San Francisco by cabin class

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Ontario and San Francisco flights

Browse other Ontario and San Francisco flight options. Last updated on 9 October 2026.

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Other flights to San Francisco

Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 9 October 2026.

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

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

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

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

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Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 October 2026.

Best flights from Ontario to San Francisco
Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 October 2026.

Direct flights from Ontario to San Francisco
Explore direct flight options from Ontario to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 9 October 2026.

Last-minute flights from Ontario to San Francisco
Discover last-minute flight deals from Ontario to San Francisco. Data last updated 9 October 2026 and is based on user searches.

One-way flights from Ontario to San Francisco
Search for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated 9 October 2026.

Ontario to San Francisco flights typically cost between £88 and £174 in November.
The cheapest return price found within the last 5 days was £86 on United Airlines (4 Nov–4 Nov).