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Cheap flights from San Diego to Ontario from C$ 146

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — YYZ
11 Jan — 18 Jan1
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 12 December 2025.

Wed 31/1210:10 p.m.SAN - YYZ
1 stop29h 37mMultiple Airlines
Sun 11/11:30 p.m.YYZ - SAN
2 stops20h 47mMultiple Airlines
Deal found 9/12C$ 575
Wed 24/1210:10 p.m.SAN - YYZ
1 stop29h 10mMultiple Airlines
Wed 31/1210:50 p.m.YYZ - SAN
2 stops16h 21mMultiple Airlines
Deal found 10/12C$ 616
Sun 21/1210:10 p.m.SAN - YYZ
1 stop18h 45mMultiple Airlines
Sun 18/11:30 p.m.YYZ - SAN
2 stops21h 51mMultiple Airlines
Deal found 11/12C$ 643
Fri 12/121:33 p.m.SAN - YYZ
1 stop13h 47mMultiple Airlines
Sun 14/124:45 p.m.YYZ - SAN
2 stops22h 53mMultiple Airlines
Deal found 10/12C$ 710
Sat 13/128:05 a.m.SAN - YYZ
1 stop8h 50mMultiple Airlines
Mon 15/127:55 p.m.YYZ - SAN
2 stops53h 51mMultiple Airlines
Deal found 9/12C$ 720
Sat 20/127:21 p.m.SAN - YYZ
2 stops26h 05mMultiple Airlines
Sun 18/18:00 p.m.YYZ - SAN
1 stop15h 21mMultiple Airlines
Deal found 11/12C$ 727
Wed 10/1212:40 p.m.SAN - YYZ
Nonstop4h 50mAir Canada
Sun 14/1210:00 a.m.YYZ - SAN
Nonstop5h 38mAir Canada
Deal found 9/12C$ 735
Sun 14/121:48 p.m.SAN - YYZ
1 stop13h 32mMultiple Airlines
Tue 16/124:45 p.m.YYZ - SAN
1 stop9h 02mMultiple Airlines
Deal found 11/12C$ 741
Wed 31/1211:11 a.m.SAN - YUL
1 stop9h 34mMultiple Airlines
Thu 8/16:45 a.m.YUL - SAN
2 stops33h 44mMultiple Airlines
Deal found 11/12C$ 742
Wed 31/1211:11 a.m.SAN - YUL
1 stop9h 34mMultiple Airlines
Fri 9/16:45 a.m.YUL - SAN
2 stops42h 13mMultiple Airlines
Deal found 11/12C$ 743
Sun 14/126:15 a.m.SAN - YYZ
1 stop30h 20mAlaska Airlines
Tue 16/124:45 p.m.YYZ - SAN
2 stops26h 35mAlaska Airlines
Deal found 11/12C$ 745
Wed 31/1211:11 a.m.SAN - YUL
1 stop9h 34mMultiple Airlines
Sun 11/16:45 a.m.YUL - SAN
2 stops32h 29mMultiple Airlines
Deal found 11/12C$ 765

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 12 December 2025.

Round-trip from

C$ 552

One-way from

C$ 146

Popular in

October

Cheapest in

March

Average price

C$ 775

Good one-way deal

C$ 355 or less
Alaska Airlines
  • Alaska Airlines
  • 20/1-10/2
  • 2 total stops
  • 50h 42m total
  • San Diego to Ontario
Search Deals
7/1
  • 7/1
  • 2 total stops
  • 34h 28m total
  • San Diego to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 126 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 12 December 2025.
Use the filters below to find and compare flights from San Diego to Ontario that are best for you.

Fly from

San Diego

Fly to

Ontario

Route

Depart

Return

Price

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Sun 25/1

6:55 p.m.-9:04 a.m.

2 stops11h 09m

Toronto Pearson Intl

Sun 1/2

7:45 a.m.-6:00 p.m.

2 stops13h 15m

C$ 556

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Wed 11/2

7:00 a.m.-11:13 p.m.

2 stops13h 13m

Toronto Pearson Intl

Fri 27/2

12:11 p.m.-10:20 p.m.

2 stops13h 09m

C$ 556

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Fri 20/2

6:50 a.m.-11:11 p.m.

2 stops13h 21m

Toronto Pearson Intl

Fri 27/2

12:11 p.m.-10:20 p.m.

2 stops13h 09m

C$ 556

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Mon 9/2

6:55 p.m.-9:04 a.m.

2 stops11h 09m

Toronto Pearson Intl

Wed 25/2

10:05 a.m.-5:50 p.m.

2 stops10h 45m

C$ 556

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Sun 25/1

9:45 p.m.-2:35 p.m.

1 stop13h 50m

Montreal Pierre Elliott Trudeau Intl

Sun 1/2

7:30 p.m.-11:47 a.m.

1 stop19h 17m

C$ 557

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Mon 19/1

6:15 a.m.-3:35 p.m.

1 stop30h 20m

Toronto Pearson Intl

Mon 9/2

4:45 p.m.-10:07 a.m.

1 stop20h 22m

C$ 563

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Sat 24/1

4:01 p.m.-3:35 p.m.

1 stop20h 34m

Toronto Pearson Intl

Tue 10/2

4:45 p.m.-10:07 a.m.

1 stop20h 22m

C$ 563

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Thu 22/1

8:42 p.m.-3:35 p.m.

1 stop15h 53m

Toronto Pearson Intl

Wed 11/2

4:45 p.m.-11:09 p.m.

1 stop9h 24m

C$ 563

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Thu 5/2

6:20 a.m.-9:23 p.m.

1 stop12h 03m

Toronto Pearson Intl

Sun 8/2

1:14 p.m.-10:26 p.m.

1 stop12h 12m

C$ 571

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Fri 13/3

12:35 p.m.-7:05 a.m.

1 stop15h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 17/3

6:45 a.m.-1:13 p.m.

2 stops33h 28m

C$ 585

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 60 results
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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, December is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 28). Flying from San Diego to Region of Ontario in September is currently the most expensive (average of C$ 336). 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 12 December 2025.

One of the essential ways to save on airfare from San Diego to Region of Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 67% on airfare.

Weekly flight availability from San Diego to Region of Ontario

Explore weekly flight availability from San Diego to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 December 2025.

The most flights from SAN to CAON are scheduled on a Monday (2 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).

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 12 December 2025.
Read reviews from past customers who have flown Porter Airlines,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.
Porter Airlines
8.0
Very good
397 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.2

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
8.0
Very good
397 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.2

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
United Airlines
7.4
Good
9,095 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.2

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,514 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.2

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

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?

    Delta, Alaska Airlines, and WestJet can get you from San Diego to Region of Ontario in just under 11h 09m. Your travel time can differ by up to 19h 11m. San Diego and Region of Ontario are separated by a distance of 3465 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 United Airlines, which is currently one of the cheapest options available, starting at C$ 131. Porter Airlines flights start at C$ 149 while deals on Air Canada start at C$ 178 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 cheapest flights from San Diego to Region of Ontario?

    While on average a flight from San Diego to Region of Ontario is generally C$ 355, our data shows the cheapest flight currently is C$ 355. When looking at the most popular route, (San Diego - Toronto Pearson Intl), you can expect to pay C$ 316 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, December is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 28). Flying from San Diego to Region of Ontario in September is currently the most expensive (average of C$ 336). 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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 289AverageC$ 482FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 343AverageC$ 407FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 388AverageC$ 635FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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