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$172+ Cheap flights from San Diego (SAN) to Ontario

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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — YYZ
Aug 25 — Sep 11
Tue 8/25
Tue 9/1
1 adult, Economy
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Cheap flight deals from San Diego to Ontario

Cheapest flights from San Diego to Ontario
Explore the most affordable flight options available from San Diego to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 26, 2026.

This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/163:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 9/216:00 am
YYZ
-
SAN
1 stop11h 10m
WestJet
Deal found 7/25$329
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 10/227:00 am
YYZ
-
SAN
1 stop10h 10m
WestJet
Deal found 7/26$332
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 10/158:00 am
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 7/24$336
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Sun 10/186:00 am
YYZ
-
SAN
1 stop11h 10m
WestJet
Deal found 7/23$337
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:30 pm
SAN
-
YKF
1 stop25h 20m
WestJet
Sun 9/208:40 pm
YKF
-
SAN
1 stop20h 30m
WestJet
Deal found 7/25$340
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Sat 10/38:00 am
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 7/26$346
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 10/58:00 am
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 7/24$347
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Sun 9/203:30 pm
YYZ
-
SAN
2 stops25h 40m
WestJet
Deal found 7/25$349
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/233:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 9/286:00 am
YYZ
-
SAN
1 stop11h 10m
WestJet
Deal found 7/24$350
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.
Tue 9/83:30 pm
SAN
-
YYZ
1 stop11h 15m
WestJet
Tue 9/158:00 am
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 7/25$351
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:30 pm
SAN
-
YHM
1 stop22h 45m
WestJet
Sun 9/206:10 pm
YHM
-
SAN
1 stop23h 00m
WestJet
Deal found 7/25$364
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:30 pm
SAN
-
YKF
1 stop25h 20m
WestJet
Mon 10/198:40 pm
YKF
-
SAN
1 stop20h 30m
WestJet
Deal found 7/23$369

Find flight deals from San Diego to Ontario

Keep the following information in mind while searching for San Diego to Ontario flight deals. Data was last updated July 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$329
(FlightHub)

One-way from

$172
(Kiwi.com)

Popular in

October

Cheapest in

January

Average price

$487

Good round-trip deal

$499 or less

Good one-way deal

$254 or less
Provider with most accurate pricing for San Diego-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Toronto (YTO) flights.
Search Deals
From San Diego to Ontario
Search Deals
One-way flight from San Diego to Ontario
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 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 San Diego to Ontario.
Search Deals
Price to beat on a one-way flight from San Diego to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego to Ontario 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 26, 2026.
Use the filters below to find and compare flights from San Diego to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Tue 9/15

3:30 pm-7:50 pm

1 stop25h 20m

Toronto Region of Waterloo Intl

Sat 9/19

8:40 pm-2:10 pm

1 stop20h 30m

$375

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Wed 9/23

3:30 pm-7:50 pm

1 stop25h 20m

Toronto Region of Waterloo Intl

Sun 9/27

8:40 pm-2:10 pm

1 stop20h 30m

$379

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Thu 10/15

3:30 pm-7:50 pm

1 stop25h 20m

Toronto Region of Waterloo Intl

Sun 10/18

8:40 pm-2:10 pm

1 stop20h 30m

$389

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Thu 10/8

3:30 pm-7:50 pm

1 stop25h 20m

Toronto Region of Waterloo Intl

Mon 10/12

8:40 pm-2:10 pm

1 stop20h 30m

$411

San DiegoHamilton

SAN - YHM

SANYHM

San Diego

Mon 10/5

3:30 pm-5:15 pm

1 stop22h 45m

Hamilton

Thu 10/15

6:10 pm-2:10 pm

1 stop23h 00m

$413

San DiegoHamilton

SAN - YHM

SANYHM

San Diego

Wed 9/23

3:30 pm-5:15 pm

1 stop22h 45m

Hamilton

Sun 9/27

6:10 pm-2:10 pm

1 stop23h 00m

$421

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Tue 8/11

3:30 pm-5:35 am

1 stop11h 05m

Ottawa

Tue 8/18

6:00 am-2:10 pm

1 stop11h 10m

$430

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Wed 8/19

3:30 pm-5:35 am

1 stop11h 05m

Ottawa

Mon 8/24

6:00 am-8:14 pm

2 stops17h 14m

$431

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 9/29

7:00 am-9:40 pm

2 stops11h 40m

London

Sat 10/3

5:40 am-12:16 pm

1 stop9h 36m

$433

San DiegoHamilton

SAN - YHM

SANYHM

San Diego

Wed 9/16

3:30 pm-5:15 pm

1 stop22h 45m

Hamilton

Mon 9/21

6:10 pm-2:10 pm

1 stop23h 00m

$458

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from San Diego to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San Diego 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 San Diego to Ontario

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

Currently, March is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of $434). Flying from San Diego to Region of Ontario in August is currently the most expensive (average of $615). 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 SAN to ON?

Find hourly flight availability from San Diego to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 26, 2026.

When flying from San Diego to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Airfare is below average for this route at the moment.
San Diego to Region of Ontario flights typically cost between $500 and $710 in September.
The cheapest round-trip price found within the last 5 days was $329 on WestJet (Sep 16-Sep 21).

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

The price you pay for your flight from San Diego to Region of Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 49 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 26, 2026.
See what other customers who have flown with Delta,United Airlines, andQatar Airways from San Diego to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.8
Good
8,486 reviews
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
10,042 reviews
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Qatar Airways
7.3
Good
3,742 reviews
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.1
Good
11,843 reviews
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.1
Good
11,390 reviews
Delta
7.8
Good
8,486 reviews

Crew

8.5

Overall

7.8

Comfort

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from San Diego to Ontario. 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 from for flights from San Diego to Ontario?

    If you book a flight to Ontario from San Diego, you will be flying from San Diego, which is the city’s only airport. San Diego (SAN) is located 2.6 mi from the center of San Diego.

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

    Departing from San Diego to Region of Ontario will take you 11h 40m. Airlines will cover a distance of 2070 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $143 on Air Canada. Other airlines that offer cheap prices include United Airlines from $154 and American Airlines from $172 one-way.

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

    The most popular route from San Diego to Region of Ontario is San Diego - Toronto Pearson Intl. You may also consider San Diego - Montreal Pierre Elliott Trudeau Intl or San Diego - Toronto Island.

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

    No one likes to see their flight delayed. When booking a flight from San Diego to Region of Ontario consider choosing Air Canada Rouge (81%), Air Canada (78%) or United Airlines (77%) as they are the most reliable in getting you off to your destination on time.

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

    On average you can expect to pay $468 for a flight from San Diego to Region of Ontario. The cheapest flight overall is $204 while the most popular route, (San Diego - Toronto Pearson Intl) is currently priced at $350.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of $434). Flying from San Diego to Region of Ontario in August is currently the most expensive (average of $615). 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

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Alternative routes for San Diego to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from San Diego to Ontario

Discover the top 4 airlines that operate flights from San Diego to Ontario. 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 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$212Average$533FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$264Average$563FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$303Average$612FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$418Average$601FlexibilityNo cancel feeOn-time71%

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