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

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Thu 2/22
Thu 3/1
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Good to Know

Low Season:
January
Best time to beat the crowds
2%
expected price decrease
High Season:
July
Most popular time to fly
9%
expected price increase
Average Price:
$212
(avg. price over the last 2 weeks)
Good Deal:
$161
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 $160 or less.
The cheapest flight from Ontario to San Francisco was found 32 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 June, July and August. The cheapest month to fly is January.
Morning departure is around 9% 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 63 (nonstop) flights between Ontario and San Francisco per week, averaging 9 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 American Airlines ($108), Multiple Airlines ($195) and United ($211).
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 (4 times daily), United (4 times daily), Copa Airlines (1 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, Friday is the cheapest day to fly on average and Saturday is the most expensive. Flying from San Francisco back to Ontario, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

Airports
Origin
Ontario
$108
only
$108
Destination
San Francisco
$108
only
$108
Fri, Mar 2
ONT
SFO
6h 47m
Sat, Mar 3
SFO
ONT
7h 00m
Trip: 2 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 28375 reviews
Overall
7.4
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
ILM
CLT
Okay 4.6

The crew was nice

I flew American four times in 7 days, every flight was delayed. delay times varied from 90 minutes to over three hours. Fog in Chicago was beyond anybody's control, but the other times were not weather related, I recently flew frontier Air and their flights were also late. I jinxed myself by stating I never have this issue with AA. Great job at proving me wrong. I flew a good bit last year and these issues didn't start until after the new year., Thank you for your time.

BUF
PHL
Mediocre 2.0

None of the experience was pleasant

First flight was delayed causing us to miss the 2nd flight and we ended sleeping on a chair at the airport waiting for a morning flight. AMERICAN AIRLINES didn't even have the decency to put us in a hotel for the night due to their delay. Then they added a 2nd lay over which was delayed for hours also. Traveling was to visit my mother who had cancer and I was sick so this made the trip even more distasteful.

PHL
SFO
Good 7.6

Tight connection! The airlines need to Realize that a 2 hour layover is NOT enough when you have to go through immigration, customs, and security before making your next flight!

BOS
LAX
Okay 4.0

What you expect from an internal US flight: no food, crowded flight, cramped seats. I have come to expect two things - arrive on time and arrive safely. The good, we arrived safely.

Pulled away from gate and sat on tarmac for over an hour while technical difficulties fixed. We should not have boarded until plane was ready. We arrived over one hour late and just made connecting flight. Our luggage was not so fortunate.

ORD
CLE
Excellent 10.0

It was a very good fight

I didn't like the fact that the gate kept on changed 3-4 times and that it was delayed for an hour

Tue, Mar 20
ONT
SFO
6h 46m
Fri, Mar 23
SFO
ONT
1h 25m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Apr 9
ONT
SFO
1h 33m
Wed, Apr 11
SFO
ONT
1h 30m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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 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

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
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

Wed, May 9
ONT
SFO
1h 29m
Thu, May 17
SFO
ONT
1h 23m
Trip: 9 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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
Okay 5.6

Que acomoden a las parejas juntas.

Asiento incomodo

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 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

Thu, May 17
ONT
SFO
1h 29m
Mon, May 21
SFO
ONT
1h 30m
Trip: 5 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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

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
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

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

Tue, Jun 19
ONT
SFO
1h 36m
Tue, Jun 26
SFO
ONT
1h 36m
Trip: 8 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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
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
Excellent 10.0

on time

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

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.

Tue, Jul 24
ONT
SFO
1h 30m
Tue, Jul 31
SFO
ONT
1h 18m
Trip: 8 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

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

Tue, Aug 7
ONT
SFO
1h 35m
Thu, Aug 9
SFO
ONT
1h 18m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

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

The size of the plane.

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

Thu, Mar 8
ONT
SFO
1h 34m
Fri, Mar 9
SFO
ONT
8h 28m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Aug 22
ONT
SFO
1h 18m
Sun, Aug 26
SFO
ONT
1h 18m
Trip: 5 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

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

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
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.

Sat, Mar 31
ONT
SFO
1h 34m
Mon, Apr 16
SFO
ONT
1h 30m
Trip: 17 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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

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
Excellent 10.0

on time

ONT
SFO
Okay 5.3

Crew was helpful and friendly.

Flight got delayed and almost missed my connection.

ONT
SFO
Excellent 9.6

Ontario airport is so easy and convenient

Wed, Mar 14
ONT
SFO
1h 34m
Fri, Mar 16
SFO
ONT
1h 25m
Trip: 3 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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
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
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
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.

Fri, Jun 8
ONT
SFO
1h 27m
Sun, Jul 8
SFO
ONT
1h 27m
Trip: 31 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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

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 8.0

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
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 10.0

on time

Mon, Feb 26
ONT
SFO
1h 34m
Fri, Mar 2
SFO
ONT
1h 25m
Trip: 5 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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

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
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
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.

Sat, Feb 24
ONT
SFO
1h 34m
Sun, Feb 25
SFO
ONT
1h 25m
Trip: 2 days
5.9OkayShow reviews
Overall 5.9 Okay
Based on 87 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
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
Excellent 9.6

Ontario airport is so easy and convenient

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
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.

Show more results

Ontario to San Francisco Flight Information

Avg. Flight Duration 1h 28m
Flights Arrive in San Francisco
Flights Depart from Ontario
Flight Price $108
Distance 363 miles
Airlines American Airlines, United
*
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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.