Trips

Find Cheap Flights from Ontario to San Francisco (ONT - SFO)

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Fri 8/17
Fri 8/24
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Ontario to San Francisco Flight Information

Avg. Flight Duration 1h 27m
Flights Arrive in San Francisco
Flights Depart from Ontario
Flight Price $231
Distance 363 miles
Airlines United

Good to Know

Low Season:
December
Best time to beat the crowds
1%
expected price decrease
High Season:
June
Most popular time to fly
9%
expected price increase
Average Price:
$265
(avg. price over the last 2 weeks)
Good Deal:
$230
or less (round trip)

When to Book Flights from Ontario to San Francisco

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top Tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $230 or less.
The cheapest flight from Ontario to San Francisco was found 81 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
High season is considered to be May, June and July. The cheapest month to fly is December.
Morning departure is around 18% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Ontario to San Francisco Flights

How long does a flight from Ontario to San Francisco take?
An average nonstop flight takes 1h 18m, covering a distance of 363 miles.
How many flights are there between Ontario and San Francisco?
There are 152 (nonstop) flights between Ontario and San Francisco per week, averaging 21 per day.
Which airlines provide the cheapest flights from Ontario to San Francisco?
In the past 3 days, the cheapest round-trip tickets were found on United ($231)
Do I need a passport to fly between Ontario and San Francisco?
No.
Which airlines fly most frequently between Ontario and San Francisco?
Air Canada (9 times daily), United (9 times daily), Copa Airlines (3 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Ontario to San Francisco?
For Ontario to San Francisco, Saturday is the cheapest day to fly on average and Thursday is the most expensive. Flying from San Francisco back to Ontario, the best deals are generally found on Friday, with Saturday being the most expensive.

Book cheap flights from Ontario to San Francisco (round-trip)

Airports
Origin
Ontario
$231
only
$231
Destination
San Francisco
$231
only
$231
Sat, Sep 8
ONT
Ontario
SFO
San Francisco
1h 27m
Mon, Sep 10
SFO
San Francisco
ONT
Ontario
1h 30m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

ONT
SFO
Excellent 8.0

i was rebooked and am still on my way

i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

Sat, Sep 29
ONT
Ontario
SFO
San Francisco
1h 33m
Mon, Oct 1
SFO
San Francisco
ONT
Ontario
1h 31m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Excellent 8.0

i was rebooked and am still on my way

i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Excellent 10.0

on time

ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

Thu, Oct 4
ONT
Ontario
SFO
San Francisco
1h 27m
Sun, Oct 7
SFO
San Francisco
ONT
Ontario
1h 29m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.6

I liked nothing about my flights.

I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen.

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

ONT
SFO
Excellent 10.0

on time

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

Fri, Oct 26
ONT
Ontario
SFO
San Francisco
1h 34m
Mon, Oct 29
SFO
San Francisco
ONT
Ontario
1h 29m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.0

The fact that I got fully refunded, even though I still lost out on $500+.

My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United.

ONT
SFO
Excellent 8.0

i was rebooked and am still on my way

i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra

ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

ONT
SFO
Mediocre 2.0

Nothing

Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification.

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

Fri, Nov 23
ONT
Ontario
SFO
San Francisco
1h 27m
Sun, Nov 25
SFO
San Francisco
ONT
Ontario
1h 29m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

ONT
SFO
Mediocre 2.0

The fact that I got fully refunded, even though I still lost out on $500+.

My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United.

ONT
SFO
Excellent 8.0

i was rebooked and am still on my way

i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra

ONT
SFO
Excellent 8.0

I liked how quick and easy the flight was; from boarding to exiting the plane in SFO.

The size of the plane.

Fri, Nov 30
ONT
Ontario
SFO
San Francisco
1h 29m
Mon, Dec 3
SFO
San Francisco
ONT
Ontario
1h 27m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Excellent 10.0

on time

ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Mediocre 2.6

I liked nothing about my flights.

I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen.

ONT
SFO
Excellent 8.0

I liked how quick and easy the flight was; from boarding to exiting the plane in SFO.

The size of the plane.

ONT
SFO
Mediocre 2.0

The fact that I got fully refunded, even though I still lost out on $500+.

My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United.

Thu, Dec 27
ONT
Ontario
SFO
San Francisco
1h 27m
Tue, Jan 1
SFO
San Francisco
ONT
Ontario
1h 18m
Trip: 6 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

ONT
SFO
Mediocre 2.0

Nothing

Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification.

ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Excellent 8.0

I liked how quick and easy the flight was; from boarding to exiting the plane in SFO.

The size of the plane.

Thu, Jan 3
ONT
Ontario
SFO
San Francisco
1h 18m
Thu, Jan 10
SFO
San Francisco
ONT
Ontario
1h 18m
Trip: 8 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.6

I liked nothing about my flights.

I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen.

ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Mediocre 2.0

Nothing

Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification.

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

Fri, Feb 22
ONT
Ontario
SFO
San Francisco
1h 35m
Sun, Feb 24
SFO
San Francisco
ONT
Ontario
1h 27m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Mediocre 2.6

I liked nothing about my flights.

I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen.

ONT
SFO
Excellent 10.0

on time

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

ONT
SFO
Mediocre 2.0

Nothing

Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification.

Thu, Aug 30
ONT
Ontario
SFO
San Francisco
1h 27m
Sun, Sep 2
SFO
San Francisco
ONT
Ontario
1h 31m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Excellent 10.0

on time

ONT
SFO
Mediocre 2.0

The fact that I got fully refunded, even though I still lost out on $500+.

My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United.

ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

Fri, Aug 31
ONT
Ontario
SFO
San Francisco
1h 27m
Mon, Sep 3
SFO
San Francisco
ONT
Ontario
1h 30m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Mediocre 2.0

The fact that I got fully refunded, even though I still lost out on $500+.

My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United.

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Mediocre 2.0

Flight attendants tried but could not change situation

I losr one of two days- moving furniture Have to stay up another night to getready

ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

ONT
SFO
Mediocre 2.0

Arrival time was delayed 2 hours and my itinerary fell apart. United could not assist me. I bought a ticket from Alaska Airlines from a different airport.to JFK.

Thu, Aug 23
ONT
Ontario
SFO
San Francisco
1h 27m
Sun, Aug 26
SFO
San Francisco
ONT
Ontario
1h 31m
Trip: 4 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 90 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.5
ONT
SFO
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

ONT
SFO
Mediocre 2.0

Flight attendants tried but could not change situation

I losr one of two days- moving furniture Have to stay up another night to getready

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Excellent 8.0

i was rebooked and am still on my way

i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra

ONT
SFO
Excellent 8.6

Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour

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