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Cheap flights from San Diego to Ontario from C$ 158

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
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap 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 11 September 2025.

Round-trip from

C$ 421

One-way from

C$ 158

Popular in

October

Cheapest in

January

Average price

C$ 647

Good round-trip deal

C$ 214 or less

Good one-way deal

C$ 290 or less
24/10-29/10
  • 24/10-29/10
  • 2 total stops
  • 23h 06m total
  • San Diego to Ontario
Search Deals
1/10
  • 1/10
  • 2 total stops
  • 19h 45m total
  • San Diego to Ontario
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (C$ 145 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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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

Find 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 11 September 2025.

Fri 24/106:25 a.m.SAN - YYZ
1 stop10h 33mMultiple Airlines
Wed 29/109:35 a.m.YYZ - SAN
1 stop12h 33mMultiple Airlines
Deal found 10/9C$ 421
Wed 15/108:00 a.m.SAN - YYZ
1 stop8h 45mMultiple Airlines
Wed 22/109:45 a.m.YYZ - SAN
1 stop14h 35mMultiple Airlines
Deal found 11/9C$ 423
Fri 3/106:15 a.m.SAN - YYZ
1 stop10h 43mMultiple Airlines
Mon 6/1010:05 a.m.YYZ - SAN
1 stop8h 58mMultiple Airlines
Deal found 10/9C$ 425
Thu 9/106:25 a.m.SAN - YYZ
1 stop10h 20mMultiple Airlines
Tue 21/107:15 a.m.YYZ - SAN
1 stop14h 31mMultiple Airlines
Deal found 10/9C$ 427
Sat 27/96:15 a.m.SAN - YYZ
3 stops21h 37mMultiple Airlines
Mon 29/910:00 a.m.YYZ - SAN
2 stops15h 26mMultiple Airlines
Deal found 11/9C$ 428
Wed 22/108:00 a.m.SAN - YYZ
1 stop8h 58mMultiple Airlines
Mon 27/1010:00 a.m.YYZ - SAN
2 stops16h 04mMultiple Airlines
Deal found 10/9C$ 430
Sat 18/102:05 p.m.SAN - YYZ
1 stop13h 07mMultiple Airlines
Tue 21/1011:00 a.m.YYZ - SAN
2 stops13h 20mMultiple Airlines
Deal found 11/9C$ 431
Sat 18/108:00 a.m.SAN - YYZ
2 stops19h 12mMultiple Airlines
Thu 23/1012:00 p.m.YYZ - SAN
2 stops14h 04mMultiple Airlines
Deal found 11/9C$ 432
Fri 10/106:25 a.m.SAN - YYZ
1 stop20h 55mMultiple Airlines
Wed 15/109:30 a.m.YYZ - SAN
1 stop14h 50mMultiple Airlines
Deal found 10/9C$ 434
Fri 10/105:59 p.m.SAN - YYZ
1 stop9h 21mMultiple Airlines
Thu 23/1012:00 p.m.YYZ - SAN
2 stops14h 04mMultiple Airlines
Deal found 10/9C$ 435
Sat 11/108:00 a.m.SAN - YYZ
2 stops11h 52mMultiple Airlines
Tue 21/107:15 a.m.YYZ - SAN
1 stop14h 31mMultiple Airlines
Deal found 10/9C$ 437
Sun 26/104:06 p.m.SAN - YYZ
1 stop11h 14mMultiple Airlines
Mon 3/119:45 a.m.YYZ - SAN
1 stop10h 07mMultiple Airlines
Deal found 10/9C$ 438

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 11 September 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

Sat 27/9

6:15 a.m.-6:52 a.m.

3 stops21h 37m

Toronto Pearson Intl

Mon 29/9

10:00 a.m.-10:26 p.m.

2 stops15h 26m

C$ 428

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Thu 2/10

8:25 a.m.-6:12 a.m.

2 stops18h 47m

Toronto Pearson Intl

Sat 4/10

9:45 a.m.-11:40 p.m.

1 stop16h 55m

C$ 449

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Mon 20/10

9:14 p.m.-8:00 p.m.

1 stop19h 46m

Toronto Pearson Intl

Fri 31/10

9:45 a.m.-4:20 p.m.

1 stop9h 35m

C$ 479

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Sat 15/11

10:00 p.m.-11:59 a.m.

1 stop10h 59m

Montreal Pierre Elliott Trudeau Intl

Tue 18/11

12:45 p.m.-8:13 p.m.

1 stop10h 28m

C$ 482

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Sat 11/10

2:11 p.m.-6:45 a.m.

2 stops13h 34m

Ottawa

Sat 18/10

6:00 a.m.-1:20 p.m.

1 stop10h 20m

C$ 489

San DiegoOttawa

SAN - YOW

SANYOW

San Diego

Fri 7/11

10:30 p.m.-10:26 a.m.

1 stop8h 56m

Ottawa

Mon 10/11

5:14 p.m.-10:20 p.m.

1 stop8h 06m

C$ 514

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Mon 3/11

6:02 p.m.-3:35 p.m.

2 stops18h 33m

Toronto Pearson Intl

Fri 7/11

4:45 p.m.-8:30 a.m.

2 stops18h 45m

C$ 522

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Mon 3/11

11:02 a.m.-11:59 p.m.

2 stops9h 57m

Toronto Pearson Intl

Sat 8/11

9:00 a.m.-3:00 p.m.

2 stops9h 00m

C$ 522

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Wed 22/10

2:32 p.m.-3:00 p.m.

2 stops21h 28m

Toronto Pearson Intl

Tue 28/10

4:45 p.m.-8:40 a.m.

2 stops18h 55m

C$ 528

San DiegoToronto

SAN - YKF

SANYKF

San Diego

Thu 2/10

6:15 a.m.-5:30 a.m.

2 stops20h 15m

Toronto Region of Waterloo Intl

Sat 4/10

6:00 a.m.-1:20 p.m.

1 stop10h 20m

C$ 536

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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, January is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 168). Flying from San Diego to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11 September 2025.

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.

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 11 September 2025.

The most flights from SAN to CAON are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 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 11 September 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
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,937 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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, United Airlines, and Alaska Airlines can get you from San Diego to Region of Ontario in just under 8h 56m. Your travel time can differ by up to 9h 37m. San Diego and Region of Ontario are separated by a distance of 3798 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 WestJet, which is currently one of the cheapest options available, starting at C$ 195. Alaska Airlines flights start at C$ 206 while deals on Delta start at C$ 212 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$ 274, our data shows the cheapest flight currently is C$ 173. When looking at the most popular route, (San Diego - Toronto Pearson Intl), you can expect to pay C$ 335 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, January is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 168). Flying from San Diego to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 256AverageC$ 484FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 290AverageC$ 409FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 422AverageC$ 629FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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