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Cheap flights from San Diego to Ontario from C$ 198

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — YYZ
29 May — 5 Jun1
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 29 April 2026.

Thu 24/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 5/107:00 a.m.
YYZ
-
SAN
1 stop10h 10m
WestJet
Deal found 28/4C$ 411
Tue 8/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Mon 21/98:00 a.m.
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 27/4C$ 419
Thu 24/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Tue 29/96:10 a.m.
YYZ
-
SAN
2 stops11h 00m
WestJet
Deal found 28/4C$ 428
Thu 15/103:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Thu 22/108:00 a.m.
YYZ
-
SAN
1 stop9h 10m
WestJet
Deal found 28/4C$ 437
Fri 16/103:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Sun 25/106:30 p.m.
YYZ
-
SAN
2 stops20h 15m
WestJet
Deal found 26/4C$ 444
Fri 16/101:10 p.m.
SAN
-
YYZ
Nonstop5h 00m
Air Canada
Sun 25/108:15 a.m.
YYZ
-
SAN
Nonstop5h 38m
Air Canada
Deal found 28/4C$ 445
Wed 9/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
Multiple Airlines
Tue 15/99:45 a.m.
YYZ
-
SAN
1 stop12h 02m
Multiple Airlines
Deal found 27/4C$ 451
Tue 15/93:30 p.m.
SAN
-
YYZ
1 stop11h 15m
WestJet
Sat 19/910:25 p.m.
YYZ
-
SAN
1 stop18h 45m
WestJet
Deal found 25/4C$ 452
Tue 8/97:00 a.m.
SAN
-
YYZ
1 stop9h 53m
Air Canada
Wed 16/910:00 a.m.
YYZ
-
SAN
Nonstop5h 16m
Air Canada
Deal found 29/4C$ 456
Fri 11/93:30 p.m.
SAN
-
YUL
1 stop12h 35m
WestJet
Tue 15/97:15 a.m.
YUL
-
SAN
1 stop9h 55m
WestJet
Deal found 28/4C$ 471
Mon 14/93:30 p.m.
SAN
-
YUL
1 stop12h 35m
WestJet
Wed 23/97:15 a.m.
YUL
-
SAN
1 stop9h 55m
WestJet
Deal found 29/4C$ 473
Thu 17/93:30 p.m.
SAN
-
YUL
1 stop12h 35m
WestJet
Sun 20/97:15 a.m.
YUL
-
SAN
1 stop9h 55m
WestJet
Deal found 24/4C$ 474

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 29 April 2026.

Round-trip from

C$ 411

One-way from

C$ 198

Popular in

October

Cheapest in

May

Average price

C$ 749

Good round-trip deal

C$ 424 or less

Good one-way deal

C$ 295 or less
WestJet
  • WestJet
  • 24/9-29/9
  • 2 total stops
  • 20h 25m total
  • San Diego to Ontario
Search Deals
Air Canada
  • Air Canada
  • 22/9
  • Nonstop
  • 5h 27m total
  • San Diego to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 29 April 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 DiegoLondon

SAN - YXU

SANYXU

San Diego

Wed 10/6

3:30 p.m.-5:20 a.m.

1 stop10h 50m

London

Wed 17/6

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

1 stop11h 00m

C$ 475

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Sat 3/10

10:30 p.m.-8:55 a.m.

1 stop7h 25m

Toronto Pearson Intl

Wed 7/10

6:15 a.m.-3:41 p.m.

1 stop12h 26m

C$ 479

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Tue 22/9

9:05 p.m.-9:19 a.m.

1 stop9h 14m

Toronto Pearson Intl

Sat 26/9

1:00 p.m.-6:37 p.m.

1 stop8h 37m

C$ 479

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Sat 19/9

7:00 a.m.-9:40 p.m.

2 stops11h 40m

London

Wed 23/9

5:40 a.m.-12:16 p.m.

1 stop9h 36m

C$ 479

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Tue 20/10

8:00 a.m.-7:45 p.m.

1 stop8h 45m

Montreal Pierre Elliott Trudeau Intl

Sat 24/10

3:25 p.m.-10:24 p.m.

1 stop9h 59m

C$ 538

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Sat 3/10

8:50 a.m.-11:34 p.m.

1 stop11h 44m

Montreal Pierre Elliott Trudeau Intl

Sun 18/10

6:00 a.m.-2:11 p.m.

1 stop11h 11m

C$ 540

San DiegoToronto

SAN - YYZ

SANYYZ

San Diego

Tue 20/10

2:09 p.m.-11:59 p.m.

1 stop6h 50m

Toronto Pearson Intl

Thu 29/10

6:10 a.m.-1:47 p.m.

1 stop10h 37m

C$ 565

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Sat 19/9

3:30 p.m.-5:20 a.m.

1 stop10h 50m

London

Wed 23/9

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

1 stop11h 00m

C$ 570

San DiegoMontreal

SAN - YUL

SANYUL

San Diego

Sat 3/10

3:30 p.m.-7:05 a.m.

1 stop12h 35m

Montreal Pierre Elliott Trudeau Intl

Sun 18/10

6:45 a.m.-2:10 p.m.

2 stops34h 25m

C$ 596

San DiegoToronto

SAN - YTZ

SANYTZ

San Diego

Thu 24/9

7:00 a.m.-4:41 p.m.

1 stop6h 41m

Toronto Island

Mon 5/10

12:30 p.m.-8:36 p.m.

1 stop11h 06m

C$ 605

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/4

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

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 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, April is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 165). Flying from San Diego to Region of Ontario in January is currently the most expensive (average of C$ 359). 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 29 April 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?

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 29 April 2026.
Read reviews from past customers who have flown United Airlines and Air Canada from San Diego to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,680 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,680 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
10,979 reviews
United Airlines
7.4
Good
9,680 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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, Delta, and United Airlines can get you from San Diego to Region of Ontario in just under 7h 25m. Your travel time can differ by up to 3h 25m. 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 Porter Airlines, which is currently one of the cheapest options available, starting at C$ 152. United Airlines flights start at C$ 179 while deals on Delta start at C$ 180 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$ 497, our data shows the cheapest flight currently is C$ 258. When looking at the most popular route, (San Diego - Toronto Pearson Intl), you can expect to pay C$ 393 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, April is the cheapest month in which you can book a flight from San Diego to Region of Ontario (average of C$ 165). Flying from San Diego to Region of Ontario in January is currently the most expensive (average of C$ 359). 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 2 airlines flying from San Diego to Ontario

Discover the top 2 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 29 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 372AverageC$ 669FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 440AverageC$ 528FlexibilityNo 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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