$123 Find Cheap Flights from San Diego to Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Diego to Ontario departing on 9/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Cheap Flights from San Diego to Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Toronto
Toronto1 stop$334
Ottawa
Ottawa2 stops$418
London
London2 stops$395
Sudbury
Sudbury1 stop$692
Toronto
Toronto1 stop$334
Ottawa
Ottawa2 stops$418
London
London2 stops$395
Sudbury
Sudbury1 stop$692

Book Cheap San Diego to Ontario Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Diego to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Diego to Ontario

Thu, Sep 17 - Mon, Sep 28
Multiple Airlines Logo
3:30 pm - 5:45 am
SAN
-
YYZ
11h 15m
1 stop
Multiple Airlines Logo
3:50 pm - 9:43 am
YYZ
-
SAN
20h 53m
2 stops
$334Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
9:03 pm - 8:09 pm
SAN
-
YYZ
20h 06m
1 stop
Multiple Airlines Logo
3:50 pm - 9:43 am
YYZ
-
SAN
20h 53m
2 stops
$336Multiple Airlines
Sat, Sep 19 - Sun, Oct 4
Air Canada Logo
7:00 am - 3:27 pm
SAN
-
YUL
5h 27mnonstop
Air Canada Logo
5:45 pm - 8:36 pm
YUL
-
SAN
5h 51mnonstop
$451Air Canada
Wed, Sep 30 - Sat, Oct 3
American Airlines Logo
10:46 pm - 2:32 pm
SAN
-
YYZ
12h 46m
1 stop
American Airlines Logo
11:40 am - 11:25 pm
YYZ
-
SAN
14h 45m
1 stop
$452American Airlines
Tue, Sep 8 - Tue, Sep 22
American Airlines Logo
10:47 pm - 2:32 pm
SAN
-
YYZ
12h 45m
1 stop
American Airlines Logo
11:40 am - 11:25 pm
YYZ
-
SAN
14h 45m
1 stop
$452American Airlines
Fri, Aug 28 - Sat, Sep 5
Air Canada Logo
7:00 am - 3:33 pm
SAN
-
YUL
5h 33mnonstop
Air Canada Logo
5:55 pm - 8:49 pm
YUL
-
SAN
5h 54mnonstop
$460Air Canada
Tue, Oct 6 - Sat, Oct 10
Delta Logo
1:18 pm - 11:25 pm
SAN
-
YUL
7h 07m
1 stop
Delta Logo
6:00 am - 10:40 pm
YUL
-
SAN
19h 40m
2 stops
$516Delta
Tue, Oct 6 - Tue, Oct 13
Delta Logo
1:18 pm - 11:25 pm
SAN
-
YUL
7h 07m
1 stop
Delta Logo
7:00 am - 11:55 pm
YUL
-
SAN
19h 55m
2 stops
$516Delta
Tue, Sep 15 - Wed, Sep 16
United Airlines Logo
10:30 pm - 10:40 am
SAN
-
YUL
9h 10m
1 stop
United Airlines Logo
2:20 pm - 8:29 pm
YUL
-
SAN
9h 09m
1 stop
$523United Airlines
Wed, Sep 16 - Thu, Sep 17
United Airlines Logo
12:41 pm - 8:16 am
SAN
-
YUL
16h 35m
1 stop
United Airlines Logo
11:23 am - 7:53 pm
YUL
-
SAN
11h 30m
1 stop
$523United Airlines
Booking Insights

KAYAK's insights & trends for San Diego to Ontario flights

Get data-powered insights and trends into flights from San Diego to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from San Diego to Region of Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from San Diego to Region of Ontario departing in September.

Flight prices are below average for this route right now.

Flights to Region of Ontario from San Diego usually cost between $550 and $759 in September.
The lowest price found in the past 5 days was $334 on Multiple Airlines (Sep 17-Sep 28).

What is the cheapest San Diego to Ontario flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Ontario from San Diego found in the last 5 days was to Toronto, at $306 round-trip. The most popular route is from San Diego (SAN) to Toronto Pearson Intl Airport (YYZ), and the cheapest round-trip airline ticket found on this route in the last 5 days was $306.

What is the cheapest time of day to fly to Ontario?

The average price for all round-trip flights from San Diego to Ontario depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Ontario is generally in the afternoon, when round-trip flights cost $538 on average. The most expensive time of day to fly to Ontario is generally in the morning, which is peak travel time and where the average cost of a ticket is $621.

Can I save money by flying with a layover from San Diego to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $596 on average.

What is the cheapest month to fly from San Diego to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Diego to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Diego to Ontario is March, when tickets cost $434 (return) on average. On the other hand, the most expensive months are August and December, when the average cost of round-trip tickets is $615 and $608 respectively.

What’s the cheapest day of the week to fly from San Diego to Ontario?

The average price of all round-trip flights from San Diego to Ontario clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Ontario on a Friday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from San Diego to Ontario. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

How far in advance should I book a flight from San Diego to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Diego to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Diego to Ontario, you should book around 7 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

Good to know

Low season

January

Cheapest flight

$123
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from San Diego to Ottawa

FAQs - booking Ontario flights

  • How does KAYAK find such low prices on flights from San Diego to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Diego to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Diego to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from San Diego to Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Diego to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from San Diego to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Diego to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from San Diego to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from San Diego to Ontario

 
See real verified KAYAK customer reviews for airlines flying from San Diego to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Diego to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8497 reviews
8.1Boarding
7.8Comfort
7.8Entertainment
8.5Crew
7.2Food
Airline reviews

Very good flight. Crew was great. No issues and we even arrived early.

10.0 ExcellentAnonymous, Jun 2026
SAN - DTW
Read more Delta reviews

Very good flight. Crew was great. No issues and we even arrived early.

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

There was a loud squeaky sound the whole time we were flying.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

The flight was smooth Thank God but the delays and changing gates for 3-4 times made me so tired of walking back and forth with heavy bags I thought I was going to pass out with heavy headaches but Thank God finally found the final gate and home safe. These delays happen anytime for important reasons so just be patient when you come across these situations.

Delayed my flights and no communication. We end up spending 6 hrs in Doha. No food or any concern from the airline. Terrible

Between Air India and Qatar my luggage was lost for three days. I eventually found my own luggage location using the Apple Air Tag. Air India used a paper form to report my lost luggage. I could never get past getting past luggage personnel with my report number before they would hang up on me. Only after them specifically telling Air India at Chandigarh airport where my luggage was located which was right under their noses did they react. After three days I finally received my luggage. The Air India luggage folks didn’t seem proactive in finding the luggage’s rightful owner.

The made us waiting and held our passports and boarding pass making us miss our flights

Wore experience due to delay and took me 3 days to reach my destination.

Excellent will be flying again in May with Qatar. to Botswana.

Asian Veng meal have Non Veg items which is not ok. Pure veg meals option are too less and they have inclusion of Vedgan and Lactos etc... which is taste less

The overall experience for the price we paid was mediocre. Nothing outstanding! Check in process was standard. Flight attendants could have been more well mannered. I found it rude when the attendant nudged me with the snack box to grab my attention when not looking. She could have said ,’excuse me’ instead. My son’s in flight entertainment was not working. The food was not great either. The snack options were not so great with kids in mind. Overall, might not travel qatar again.

Crew members service are at its best Seating area is very compact, could be better

I liked the menu. Cres were nice. But the seats are very uncomfortable. Got back ache Also no leg space at all. .

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

Complimentary light meal would be appreciated. But great flight crew service on all legs

The food was terrible this time. Otherwise pleasant, quiet, on-time.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

As usual, United scheduling is completely misleading. A 54-minute layover at O’Hare is too short to make a lot of connections, especially since the flight landed “on time” but had to wait on the taxiway 15 minutes for a gate to open up. Then it takes another 10 minutes to exit the plane before one can run to another concourse to catch a connecting flight.

Flight was ok. Unfortunately it was a Boeing 737, which is a cramped / tight airplane. I prefer the Airbus as they are a more comfortable flight experience.

We were traveling as a family of 5 and they refused to seat us together. There were entire rows open, and my 13 year old daughter had to sit alone. Ridiculous!

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

Well, true to American Airlines, both of my flights were delayed. But it’s a good thing that American is so consistently incompetent because if the first flight was delayed in the second flight was on time then I might’ve had a problem..

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

Cramped seats. FAA should make airlines have more legroom, for even short people complain

Flight was full, and would have preferred an aisle seat, but due to getting a late ticket ,the seat I had was adequate. The flight crew were very help full and hard working. Food and drink were excellent for the 11hr flight. Overall I was pleased with flight, and would recommend British Airways again.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

Had to wait on pilot and crew to depart and had to wait to arrive at the gate because they only had 2 crews working. Delays, delays....Planes just keep getting smaller and tighter and they nickle and dime for everything. When will an airline actually wake up and make flying more enjoyable?

I paid for what I got which was cheap, I brought my own entertainment. I knew what to expect, so I could be prepared. If you’re flying economy, check in early like me. I have no problems with my flight, was on time, staff were friendly, and overall good experience.

Multiple maintenance delays and the missed and rebooked connection changed gates at least 6 times including one which had us walking 20 minutes to another terminal and then back again. Seated our family of three in different middle seats throughout the plane and then there was an empty seat next to me. Very long travel day which I would have never agreed to if I knew the itinerary would be changed at 5 am, 2 hours before takeoff.

The flight attendants went out of their way to help me align everything so I can catch my connection as soon as we landed

Flight was canceled for a reason they knew hours before but did not mention. Next the gate chnage from 37 to 38 at least 10 times. Ridiculous.

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

Real smooth and easy, Real good leg room in coach!

Plane was old, cabin was small, overhead bins were small, seats really uncomfortable, no seat-back entertainment

. Crew was professional and friendly. Food could have been hotter

Terrible. They cancelled our flight the night before. Please give me a call to discuss.

No Wifi on either flight? What is this? The 90s?

Took almost 90 minutes to get our luggage in Pearson. AC only had 1 crew unloading ALL of their planes. Poor planning, again.

Make up your mind on how long the delay is going to be instead of email me every half an hour for 11 times to post bond the previous delay time.

Everything you need to know for your flight from San Diego to Ontario

Information on your arrival and departure airports