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Cheap flights from San Diego to Ontario from C$ 227

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — YYZ
27 Aug — 3 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from San Diego to Ontario

Enter your travel dates to find the best prices.

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 28 July 2026.

Wed 16/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 21/96:00 a.m.
YYZ
-
SAN
1 stop11h 10m
WestJet
Deal found 26/7C$ 464
Thu 15/103:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 22/107:00 a.m.
YYZ
-
SAN
1 stop10h 10m
WestJet
Deal found 26/7C$ 468
Mon 5/103:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 15/108:00 a.m.
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 24/7C$ 474
Thu 15/103:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 19/107:00 a.m.
YYZ
-
SAN
1 stop10h 10m
WestJet
Deal found 23/7C$ 475
Thu 24/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 5/106:10 a.m.
YYZ
-
SAN
2 stops11h 00m
WestJet
Deal found 27/7C$ 477
Tue 15/93:30 p.m.
SAN
-
YYZ
2 stops25h 25m
WestJet
Mon 28/98:00 a.m.
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 28/7C$ 480
Thu 17/93:30 p.m.
SAN
-
YKF
1 stop25h 20m
WestJet
Sun 20/98:40 p.m.
YKF
-
SAN
1 stop20h 30m
WestJet
Deal found 25/7C$ 480
Wed 16/97:04 p.m.
SAN
-
YYZ
2 stops22h 01m
Multiple Airlines
Mon 28/98:00 a.m.
YYZ
-
SAN
1 stop9h 10m
Multiple Airlines
Deal found 28/7C$ 482
Thu 10/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 17/97:00 a.m.
YYZ
-
SAN
1 stop10h 10m
WestJet
Deal found 27/7C$ 484
Sat 19/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 28/98:00 a.m.
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 28/7C$ 485
Thu 17/93:30 p.m.
SAN
-
YHM
1 stop22h 45m
WestJet
Sun 20/96:10 p.m.
YHM
-
SAN
1 stop23h 00m
WestJet
Deal found 25/7C$ 513
Wed 23/93:30 p.m.
SAN
-
YOW
1 stop11h 05m
WestJet
Sun 27/96:15 p.m.
YOW
-
SAN
2 stops22h 55m
WestJet
Deal found 27/7C$ 519

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 28 July 2026.

Round-trip from

C$ 464

One-way from

C$ 227

Popular in

October

Cheapest in

January

Average price

C$ 687

Good round-trip deal

C$ 304 or less

Good one-way deal

C$ 379 or less
WestJet
  • WestJet
  • 16/9-21/9
  • 2 total stops
  • 22h 25m total
  • San Diego to Ontario
Search Deals
WestJet
  • WestJet
  • 1/10
  • 1 total stop
  • 22h 45m total
  • 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 (C$ 19 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 629,999 searches. Data last updated 28 July 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 15/9

3:30 p.m.-7:50 p.m.

1 stop25h 20m

Toronto Region of Waterloo Intl

Sat 19/9

8:40 p.m.-2:10 p.m.

1 stop20h 30m

C$ 529

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Wed 23/9

3:30 p.m.-7:50 p.m.

1 stop25h 20m

Toronto Region of Waterloo Intl

Sun 27/9

8:40 p.m.-2:10 p.m.

1 stop20h 30m

C$ 534

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Thu 15/10

3:30 p.m.-7:50 p.m.

1 stop25h 20m

Toronto Region of Waterloo Intl

Sun 18/10

8:40 p.m.-2:10 p.m.

1 stop20h 30m

C$ 549

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Wed 9/9

3:30 p.m.-12:30 p.m.

2 stops18h 00m

Ottawa

Wed 16/9

6:15 p.m.-2:10 p.m.

2 stops22h 55m

C$ 601

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Wed 19/8

3:30 p.m.-5:35 a.m.

1 stop11h 05m

Ottawa

Mon 24/8

6:00 a.m.-8:14 p.m.

2 stops17h 14m

C$ 608

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 18/8

10:00 a.m.-5:20 a.m.

2 stops16h 20m

London

Tue 25/8

6:10 a.m.-2:10 p.m.

1 stop11h 00m

C$ 611

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 29/9

1:10 p.m.-9:20 a.m.

1 stop17h 10m

London

Sat 3/10

5:40 a.m.-4:12 p.m.

2 stops13h 32m

C$ 640

San DiegoHamilton

SAN - YHM

SANYHM

San Diego

Wed 16/9

3:30 p.m.-5:15 p.m.

1 stop22h 45m

Hamilton

Mon 21/9

6:10 p.m.-2:10 p.m.

1 stop23h 00m

C$ 646

San DiegoHamilton

SAN - YHM

SANYHM

San Diego

Thu 24/9

3:30 p.m.-5:15 p.m.

1 stop22h 45m

Hamilton

Thu 1/10

7:00 a.m.-2:10 p.m.

2 stops34h 10m

C$ 652

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Tue 20/10

9:45 p.m.-2:40 p.m.

1 stop13h 55m

Montreal Pierre Elliott Trudeau Intl

Fri 23/10

6:35 p.m.-12:31 a.m.

1 stop8h 56m

C$ 657

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/7

Showing 1-10 of 60 resultsSorted by cheapest first
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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 C$ 612). Flying from San Diego to Region of Ontario in August is currently the most expensive (average of C$ 867). 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 28 July 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 C$ 776 and C$ 1,070 in September.
The cheapest round-trip price found within the last 5 days was C$ 464 on WestJet (16 Sep-21 Sep).

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 28 July 2026.
Read reviews from past customers who have flown Delta,United Airlines, andAir Canada from San Diego to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,480 reviews
Check prices

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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
8,480 reviews
Delta
7.8
Good
8,480 reviews
Check prices

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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
10,046 reviews
Delta
7.8
Good
8,480 reviews
Check prices

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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
11,398 reviews
Delta
7.8
Good
8,480 reviews
Check prices

Comfort

7.8

Overall

7.8

Boarding

8.1

Entertainment

7.8

Crew

8.5

Food

7.2

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?

    Most people fly from San Diego (SAN) if they book a flight from San Diego to Ontario. San Diego is conveniently located just 4.2 km from San Diego’s city centre.

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

    WestJet, Air Canada, and United Airlines can get you from San Diego to Region of Ontario in just under 13h 55m. Your travel time can differ by up to 11h 25m. San Diego and Region of Ontario are separated by a distance of 3948 km. Both multi-stop and direct 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?

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at C$ 201. United Airlines flights start at C$ 206 while deals on Air Canada start at C$ 262 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?

    Consider Air Canada Rouge (81%), Air Canada (78%) or United Airlines (77%) when booking your flight. These represent the most reliable airlines when flying from San Diego to Region of Ontario.

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

    While on average a flight from San Diego to Region of Ontario is generally C$ 426, our data shows the cheapest flight currently is C$ 256. When looking at the most popular route, (San Diego - Toronto Pearson Intl), you can expect to pay C$ 488 for that flight.

  • 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 C$ 612). Flying from San Diego to Region of Ontario in August is currently the most expensive (average of C$ 867). 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 3 airlines flying from San Diego to Ontario

Discover the top 3 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 629,999 searches. Data last updated 28 July 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 337AverageC$ 880FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 438AverageC$ 807FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 454AverageC$ 926FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from San Diego to Ontario?

Cheapflights makes it easy to find San Diego to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from San Diego to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from San Diego.

Can Cheapflights find flights from San Diego to Ontario with no change fees?

Yes, we can. To see specific flights from San Diego to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from San Diego to Ontario become cheaper?

Not ready to book yet? You can track prices for flights from San Diego to Ontario on Cheapflights with our Price Alert feature and get notified when better prices are available.

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