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

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Sat 11/18
Sat 11/25
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Good to Know

Low Season:
December
Best time to beat the crowds
3%
expected price decrease
High Season:
October
Most popular time to fly
16%
expected price increase
Average Price:
$276
(avg. price over the last 2 weeks)
Good Deal:
$167
or less (round trip)

When to Book Flights from San Francisco to Ontario

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

Top tips for Finding a Cheap Flight

When looking for a cheap flight, consider that 25% of our users selected a flight on this route for $167 or less.
The cheapest flight from San Francisco to Ontario was found 90 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 September, October and November. The cheapest month to fly is December.
Morning departure is around 14% more expensive 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 San Francisco to Ontario Flights

How long does a flight from San Francisco to Ontario take?
An average nonstop flight takes 1h 26m, covering a distance of 363 miles.
How many flights are there between San Francisco and Ontario?
There are 251 (nonstop) flights between San Francisco and Ontario per week, averaging 37 per day.
Which airlines provide the cheapest flights from San Francisco to Ontario?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($142), Multiple Airlines ($152) and United ($161).
Do I need a passport to fly between San Francisco and Ontario?
No.
Which airlines fly most frequently between San Francisco and Ontario?
Air Canada (15 times daily), United (15 times daily), Copa Airlines (4 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly San Francisco to Ontario?
For San Francisco to Ontario, Tuesday is the cheapest day to fly on average and Friday is the most expensive. Flying from Ontario back to San Francisco, the best deals are generally found on Saturday, with Thursday being the most expensive.

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

Airports
Origin
San Francisco
$142
only
$142
Destination
Ontario
$142
only
$142
Tue, Nov 28
SFO
ONT
9h 15m
Mon, Dec 4
ONT
SFO
12h 55m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

PBI
ISP
Mediocre 2.0

Was unable to make it

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

Mon, Dec 11
SFO
ONT
17h 20m
Thu, Dec 14
ONT
SFO
1h 30m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Dec 7
SFO
ONT
1h 27m
Tue, Dec 12
ONT
SFO
1h 30m
Trip: 6 days
6.8GoodShow reviews
Overall 6.8 Good
Based on 79 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
ONT
Mediocre 3.3

The Crew attention was nice and very proffessional. Good coffee

We are very tired and the airplain isn't comfortable.

SFO
ONT
Mediocre 3.3

N/A

Kept me keep waiting for aircraft for 4 hours and toward the end told me that the flight got cancelled. Then they scheduled me to the 10:45pm flight, and the aircraft didn't come in till 12:40am. I've been waiting at the airport for more than 13 hours

SFO
ONT
Excellent 8.0

It was a very small plane.

SFO
ONT
Excellent 10.0

Great, friendly service Smooth flight

SFO
ONT
Okay 4.6

Plane got super delayed last minute without notice until arriving there at the gate.

Wed, Feb 7
SFO
ONT
5h 46m
Sat, Feb 10
ONT
SFO
6h 31m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25178 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PWM
PHL
Okay 4.6

We arrived on time.

These planes feel like they are made of Legos. They are absurdly tiny and uncomfortable (and I am a small woman). Hot and stinky when boarding and no room for you or your carry on luggage. The days of glamorous air travel seem very far away.

JUL
LIM
Okay 4.0

The bag search was very thorough and many employees were wearing their Peru jerseys under their uniforms.

Everything else. Flight was delayed almost four hours with no explanation. Received multiple calls from Avianca but all in Spanish until fifth one in English hung up once we confirmed we understood there was a delay. Staff communicated different directions. Only one cafe to wait in. Substitute breakfast served was underwhelming. Plane was incredibly dated with life vests strewn about/not tucked away. Upon deboarding, incredibly unclear that we had to completely exit and go back through security, meaning we had no time between flights for the restroom or to buy water.

SAL
MIA
Excellent 8.6

There was no individual entertainment on board (TV’s, internet, etc)

PHL
PHX
Okay 5.0

Arrived safely and on time.

No power outlets at seats.

CHO
ORD
Good 7.6

It was a little hot in the plane at during start and touchdown

Wed, Nov 29
SFO
ONT
17h 24m
Mon, Dec 4
ONT
SFO
12h 55m
Trip: 6 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

PBI
ISP
Mediocre 2.0

Was unable to make it

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

Mon, Jan 29
SFO
ONT
17h 31m
Fri, Feb 2
ONT
SFO
1h 32m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Dec 1
SFO
ONT
23h 41m
Mon, Dec 4
ONT
SFO
12h 55m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ORD
Excellent 10.0

On time. Very organized.

DEN
ORD
Okay 5.3

Low cost

They make you pay for everything. Even peanuts. No entertainment.

PBI
ISP
Mediocre 2.0

Was unable to make it

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

Fri, Dec 8
SFO
ONT
1h 27m
Tue, Dec 12
ONT
SFO
1h 30m
Trip: 5 days
6.8GoodShow reviews
Overall 6.8 Good
Based on 79 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
ONT
Mediocre 3.3

The Crew attention was nice and very proffessional. Good coffee

We are very tired and the airplain isn't comfortable.

SFO
ONT
Excellent 10.0

Although there was a slight delay, the flight was pleasant and the service very nice. We got twice something to drink and a snack. For the short flight, quite remarkable.

Everyting was fine

SFO
ONT
Excellent 8.3

the plane was cold early in the morning. I was feeling cold in the plane.

SFO
ONT
Excellent 8.6

Good crew

SFO
ONT
Excellent 8.0

It was a very small plane.

Tue, Jan 30
SFO
ONT
8h 32m
Fri, Feb 2
ONT
SFO
1h 32m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Dec 3
SFO
ONT
9h 15m
Mon, Dec 11
ONT
SFO
13h 00m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
LGA
MIA
Mediocre 3.6

Flight Very late , when departure already at night Uncomfortable seats $45 for a bag and I have drop it off myself after pay

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

MIA
ISP
Excellent 8.5

The terminal was empty. Plenty of seats. Boarding doesn't take long. Arrival at ISP is nice because it is small and empty.

PHL
MIA
Excellent 10.0

Same as all the other airlines in my opinion. Just way more afreoadable.

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

Sat, Dec 9
SFO
ONT
1h 26m
Tue, Dec 12
ONT
SFO
1h 30m
Trip: 4 days
6.8GoodShow reviews
Overall 6.8 Good
Based on 79 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
ONT
Mediocre 3.3

N/A

Kept me keep waiting for aircraft for 4 hours and toward the end told me that the flight got cancelled. Then they scheduled me to the 10:45pm flight, and the aircraft didn't come in till 12:40am. I've been waiting at the airport for more than 13 hours

SFO
ONT
Excellent 10.0

Although there was a slight delay, the flight was pleasant and the service very nice. We got twice something to drink and a snack. For the short flight, quite remarkable.

Everyting was fine

SFO
ONT
Excellent 8.6

Good crew

SFO
ONT
Mediocre 3.0

San Francisco to Ontario Delay for 10 min Then another dealy for 30 min After we board we had to waite inside the air craft for Cataring company to delever food for first classe

SFO
ONT
Excellent 8.0

It was a very small plane.

Mon, Feb 26
SFO
ONT
6h 36m
Thu, Mar 1
ONT
SFO
6h 47m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25178 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
SAL
MIA
Excellent 8.6

There was no individual entertainment on board (TV’s, internet, etc)

LAX
MIA
Good 7.6

Movies, clean, efficient

Paying of my small Checked bag

DCA
CLE
Okay 5.0

American Airlines flying out of DCA is highly disorganized. I will look to fly to Washington-Dulles next time, or just avoid American Airlines altogether.

LAX
RNO
Mediocre 2.0

Not a single part has a positive remark

Well - this partner of westjet was terrible. The amount of re direction to get to the final terminal was absurd .. that's just my venting My real problem is that then "crew" or team that represent s the American Airlines / compass part was just useless. A hand full of people - myself included didn't get a chance to board the plane as they didn't make any announcements. Beyond disappointing. When you check in they take your cell phone "in case " well no call no txt no nothing. It was a joke the level of service No apologies or anything just a group of any tired patrons getting the worst customer experience. I'll never EVER book a flight that has anything to do with American Airlines or its partners

PHL
PHX
Okay 5.0

Arrived safely and on time.

No power outlets at seats.

Wed, Feb 7
SFO
ONT
17h 31m
Thu, Feb 8
ONT
SFO
1h 32m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Dec 5
SFO
ONT
15h 20m
Wed, Dec 13
ONT
SFO
13h 00m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
ORD
Excellent 10.0

On time. Very organized.

FSD
DEN
Okay 4.6

The scheduled plane had a mechanical problem so we deplaned for alternative plan. It took six long hours to get another plane in. Meantime passengers stood in line for hours to make other arrangements. It would have been appropriate for the airline to call in extra staff to help stranded passengers. We missed the scheduled connecting flight and a tour. We got in at 1:00 am, 12 hours later than planned. We had meetings next day and were very tired because we got in so late

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

Sun, Dec 10
SFO
ONT
1h 26m
Tue, Dec 12
ONT
SFO
1h 30m
Trip: 3 days
6.8GoodShow reviews
Overall 6.8 Good
Based on 79 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
ONT
Excellent 10.0

Although there was a slight delay, the flight was pleasant and the service very nice. We got twice something to drink and a snack. For the short flight, quite remarkable.

Everyting was fine

SFO
ONT
Excellent 10.0

Great, friendly service Smooth flight

SFO
ONT
Excellent 8.6

Good crew

SFO
ONT
Mediocre 3.0

San Francisco to Ontario Delay for 10 min Then another dealy for 30 min After we board we had to waite inside the air craft for Cataring company to delever food for first classe

SFO
ONT
Excellent 8.0

It was a very small plane.

Wed, Feb 28
SFO
ONT
6h 36m
Sat, Mar 3
ONT
SFO
7h 02m
Trip: 4 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25178 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PWM
PHL
Okay 4.6

We arrived on time.

These planes feel like they are made of Legos. They are absurdly tiny and uncomfortable (and I am a small woman). Hot and stinky when boarding and no room for you or your carry on luggage. The days of glamorous air travel seem very far away.

LAX
MIA
Good 7.6

Movies, clean, efficient

Paying of my small Checked bag

FAT
DFW
Excellent 10.0

Nice amount of leg room!!!

Nothing

BDL
CLT
Okay 4.0

No baggage controls from seat 18 to 28 no bags would fit. As we exited all the front rows we're waiting to get there bags stored in back of planes overhead bins. That's just not right, especially when they charge us extra to take a bag for overhead bins storage.

LAX
RNO
Mediocre 2.0

Not a single part has a positive remark

Well - this partner of westjet was terrible. The amount of re direction to get to the final terminal was absurd .. that's just my venting My real problem is that then "crew" or team that represent s the American Airlines / compass part was just useless. A hand full of people - myself included didn't get a chance to board the plane as they didn't make any announcements. Beyond disappointing. When you check in they take your cell phone "in case " well no call no txt no nothing. It was a joke the level of service No apologies or anything just a group of any tired patrons getting the worst customer experience. I'll never EVER book a flight that has anything to do with American Airlines or its partners

Thu, Feb 8
SFO
ONT
1h 27m
Sat, Feb 10
ONT
SFO
13h 43m
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Dec 8
SFO
ONT
9h 15m
Mon, Dec 11
ONT
SFO
13h 00m
Trip: 4 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 32923 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MIA
CVG
Good 6.0

More snack/food options

DEN
SLC
Okay 5.6

Food, entertainment NA, didn’t use. Rest of flight uneventful, happy to say. Because this was so late due to previous leg of journey delayed, our planned transportation to hotel wa not available.

PVD
TPA
Excellent 9.3

Cheap, comfortable and friendly staff

Getting off the plane took forever on both legs.

MIA
PHL
Okay 5.6

Flight was on time. The flight was fast and the crew was helpful and courteous

It was cramped. Couldn't recline back. Was only offered water

MCO
DEN
Okay 4.6

The seats were clean; the cabin looked very nice. The plane got me from point A to B safely. smoothest Lansing ever!

Flight was delayed 2.5 hours. No communication from the cockpit, 2 out of the 4 flight attendants we really crabby. Undersea storage was unusually small. I’m 5’8” and my knees were pressed against the seat in front of me and the seats are hard. My legs were numb for part of the trip.

Mon, Dec 11
SFO
ONT
1h 26m
Wed, Dec 13
ONT
SFO
1h 30m
Trip: 3 days
6.8GoodShow reviews
Overall 6.8 Good
Based on 79 reviews
Overall
7.2
Boarding
7.3
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
SFO
ONT
Mediocre 3.6

Plane wasn't full

Coffee grounds in the bottom of my cup Seats way too small for a normal person much less for Someone with extra.

SFO
ONT
Okay 4.6

Plane got super delayed last minute without notice until arriving there at the gate.

SFO
ONT
Excellent 10.0

Great, friendly service Smooth flight

SFO
ONT
Mediocre 3.0

San Francisco to Ontario Delay for 10 min Then another dealy for 30 min After we board we had to waite inside the air craft for Cataring company to delever food for first classe

SFO
ONT
Mediocre 3.3

The Crew attention was nice and very proffessional. Good coffee

We are very tired and the airplain isn't comfortable.

Fri, Jan 19
SFO
ONT
5h 46m
Sun, Jan 21
ONT
SFO
6h 47m
Trip: 3 days
7.2GoodShow reviews
Overall 7.2 Good
Based on 25178 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
SAL
MIA
Excellent 8.6

There was no individual entertainment on board (TV’s, internet, etc)

DCA
CLE
Okay 5.0

American Airlines flying out of DCA is highly disorganized. I will look to fly to Washington-Dulles next time, or just avoid American Airlines altogether.

LAX
RNO
Mediocre 2.0

Not a single part has a positive remark

Well - this partner of westjet was terrible. The amount of re direction to get to the final terminal was absurd .. that's just my venting My real problem is that then "crew" or team that represent s the American Airlines / compass part was just useless. A hand full of people - myself included didn't get a chance to board the plane as they didn't make any announcements. Beyond disappointing. When you check in they take your cell phone "in case " well no call no txt no nothing. It was a joke the level of service No apologies or anything just a group of any tired patrons getting the worst customer experience. I'll never EVER book a flight that has anything to do with American Airlines or its partners

BDL
CLT
Okay 4.0

No baggage controls from seat 18 to 28 no bags would fit. As we exited all the front rows we're waiting to get there bags stored in back of planes overhead bins. That's just not right, especially when they charge us extra to take a bag for overhead bins storage.

FAT
DFW
Excellent 10.0

Nice amount of leg room!!!

Nothing

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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.