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San Diego

$182+ Cheap flights from Ontario to San Diego (SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SAN
Aug 27 — Sep 31
Thu 8/27
Thu 9/3
1 adult, Economy
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Cheap flight deals from Ontario to San Diego

Cheapest flights from Ontario to San Diego
Explore the most affordable flight options available from Ontario to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.

This Flightnetwork deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:10 am
YXU
-
SAN
1 stop11h 00m
WestJet
Mon 10/193:30 pm
SAN
-
YXU
1 stop10h 50m
WestJet
Deal found 7/26$272
This Air Canada deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:30 am
YUL
-
SAN
1 stop11h 42m
Air Canada
Mon 10/57:00 am
SAN
-
YUL
Nonstop5h 27m
Air Canada
Deal found 7/27$330
This WestJet deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:10 am
YXU
-
SAN
1 stop11h 00m
WestJet
Sat 9/193:30 pm
SAN
-
YXU
1 stop10h 50m
WestJet
Deal found 7/23$341
This Air Canada deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:45 pm
YUL
-
SAN
Nonstop5h 51m
Air Canada
Tue 9/227:00 am
SAN
-
YUL
Nonstop5h 27m
Air Canada
Deal found 7/26$342
This Booking.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:15 am
YUL
-
SAN
1 stop9h 55m
WestJet
Fri 9/113:30 pm
SAN
-
YUL
1 stop12h 35m
WestJet
Deal found 7/26$346
This Air Canada deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:00 am
YUL
-
SAN
1 stop8h 35m
Air Canada
Sun 9/137:00 am
SAN
-
YUL
Nonstop5h 27m
Air Canada
Deal found 7/23$350
This Air Canada deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:45 pm
YUL
-
SAN
Nonstop5h 51m
Air Canada
Tue 9/291:10 pm
SAN
-
YUL
1 stop8h 21m
Air Canada
Deal found 7/24$351
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/97:15 am
YUL
-
SAN
1 stop9h 55m
WestJet
Sun 9/133:30 pm
SAN
-
YUL
1 stop29h 15m
WestJet
Deal found 7/27$352
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:15 am
YUL
-
SAN
1 stop9h 55m
WestJet
Thu 9/173:30 pm
SAN
-
YUL
1 stop22h 00m
WestJet
Deal found 7/27$353
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:00 am
YUL
-
SAN
1 stop11h 11m
Delta
Tue 12/1510:30 pm
SAN
-
YUL
1 stop10h 45m
Delta
Deal found 7/23$361
This Air Canada deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/205:45 pm
YUL
-
SAN
Nonstop5h 51m
Air Canada
Sun 9/277:00 am
SAN
-
YUL
Nonstop5h 27m
Air Canada
Deal found 7/24$363
This Trip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:10 pm
YHM
-
SAN
1 stop23h 00m
WestJet
Sun 10/183:30 pm
SAN
-
YHM
1 stop22h 45m
WestJet
Deal found 7/25$366

Find flight deals from Ontario to San Diego

Keep the following information in mind while searching for Ontario to San Diego flight deals. Data was last updated July 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$272
(Flightnetwork)

One-way from

$182
(Mytrip)

Popular in

March

Cheapest in

April

Average price

$535

Good round-trip deal

$498 or less

Good one-way deal

$289 or less
Provider with most accurate pricing for Toronto (YTO)-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-San Diego flights.
Search Deals
From Ontario to San Diego
Search Deals
One-way flight from Ontario to San Diego
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Ontario to San Diego.
Search Deals
Price to beat on a one-way flight from Ontario to San Diego.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2026.
Use the filters below to find and compare flights from Ontario to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealSan Diego

YUL - SAN

YULSAN

Montreal Pierre Elliott Trudeau Intl

Tue 10/6

6:35 pm-10:17 am

1 stop18h 42m

San Diego

Wed 10/7

1:24 pm-8:16 am

1 stop15h 52m

$367

HamiltonSan Diego

YHM - SAN

YHMSAN

Hamilton

Tue 9/15

6:10 pm-2:10 pm

1 stop23h 00m

San Diego

Sat 9/19

3:30 pm-5:15 pm

1 stop22h 45m

$372

HamiltonSan Diego

YHM - SAN

YHMSAN

Hamilton

Mon 9/14

6:10 pm-2:10 pm

1 stop23h 00m

San Diego

Thu 9/17

3:30 pm-5:15 pm

1 stop22h 45m

$372

MontrealSan Diego

YUL - SAN

YULSAN

Montreal Pierre Elliott Trudeau Intl

Fri 10/2

9:45 am-10:41 pm

1 stop15h 56m

San Diego

Mon 10/5

10:20 pm-1:09 pm

1 stop11h 49m

$373

LondonSan Diego

YXU - SAN

YXUSAN

London

Sat 10/17

5:40 am-3:49 pm

2 stops13h 09m

San Diego

Tue 10/20

6:40 am-9:40 pm

2 stops12h 00m

$380

HamiltonSan Diego

YHM - SAN

YHMSAN

Hamilton

Sun 10/11

6:10 pm-2:10 pm

1 stop23h 00m

San Diego

Thu 10/15

3:30 pm-5:15 pm

1 stop22h 45m

$382

HamiltonSan Diego

YHM - SAN

YHMSAN

Hamilton

Tue 9/8

6:10 pm-2:10 pm

1 stop23h 00m

San Diego

Tue 9/15

3:30 pm-5:15 pm

1 stop22h 45m

$400

LondonSan Diego

YXU - SAN

YXUSAN

London

Tue 9/15

6:10 am-2:10 pm

1 stop11h 00m

San Diego

Sat 9/19

3:30 pm-5:20 am

1 stop10h 50m

$403

TorontoSan Diego

YKF - SAN

YKFSAN

Toronto Region of Waterloo Intl

Fri 9/11

8:40 pm-2:10 pm

1 stop20h 30m

San Diego

Sun 9/13

3:30 pm-7:50 pm

1 stop25h 20m

$404

TorontoSan Diego

YKF - SAN

YKFSAN

Toronto Region of Waterloo Intl

Tue 8/25

8:40 pm-2:10 pm

1 stop20h 30m

San Diego

Thu 10/15

3:30 pm-7:50 pm

1 stop25h 20m

$404

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/25

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Ontario with our price prediction graph.
Estimated round-trip 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 Diego

What is the cheapest month to book a flight from Region of Ontario to San Diego?

Currently, May is the cheapest month in which you can book a flight from Region of Ontario to San Diego (average of $423). Flying from Region of Ontario to San Diego in March is currently the most expensive (average of $528). 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 ON to SAN?

Find hourly flight availability from Ontario to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to San Diego as you normally would.

How much does it cost to fly round-trip from Region of Ontario to San Diego?

Airfare is below average for this route at the moment.
Region of Ontario to San Diego flights typically cost between $421 and $637 in October.
The cheapest round-trip price found within the last 5 days was $366 on Multiple Airlines (Oct 11-Oct 15).

How far ahead should I book a flight from Region of Ontario to San Diego?

Booking 86 days in advance of your planned departure date is, on average, the best time to get cheap flights from Region of Ontario to San Diego. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to San Diego from Ontario?

    Most people fly into San Diego (SAN) if they book a flight to San Diego from Ontario. San Diego is conveniently located just 2.6 mi from San Diego’s city center.

  • How long is the flight from Region of Ontario to San Diego?

    For as low as $380, United Airlines can have you in San Diego from Region of Ontario in 13h 09m. The distance from Region of Ontario to San Diego is about 2070 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Region of Ontario to San Diego one-way?

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $162. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Region of Ontario to San Diego for a low price.

  • What are the most popular routes from Region of Ontario to San Diego?

    While some choose either Montreal Pierre Elliott Trudeau Intl - San Diego or Toronto Island - San Diego, Toronto Pearson Intl - San Diego is the most popular route from Region of Ontario to San Diego.

  • What are the most reliable airlines from Region of Ontario to San Diego?

    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 Region of Ontario to San Diego on time: Air Canada Rouge (84%), United Airlines (82%), Air Canada (82%).

  • What are the cheapest flights from Region of Ontario to San Diego?

    On average you can expect to pay $598 for a flight from Region of Ontario to San Diego. The cheapest flight overall is $252 while the most popular route, (Toronto Pearson Intl - San Diego) is currently priced at $333.

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

    Yes. In addition to deals on Ontario to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Diego.

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

    Yes. Cheapflights offers flight deals from Ontario to San Diego 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 Region of Ontario to San Diego?

    Currently, May is the cheapest month in which you can book a flight from Region of Ontario to San Diego (average of $423). Flying from Region of Ontario to San Diego in March is currently the most expensive (average of $528). 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.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
National City
Chula Vista
Poway
La Mesa
Coronado
Santee
San Ysidro
Julian
Lemon Grove

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Top 4 airlines flying from Ontario to San Diego

Discover the top 4 airlines that operate flights from Ontario to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$259Average$514FlexibilityNo cancel feeOn-time67%
DeltaCheapest$275Average$437FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$323Average$454FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$324Average$504FlexibilityNo cancel feeOn-time69%

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