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Cheap flights from California to Ontario from C$ 109

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — YYZ
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap flight deals from California to Ontario

Keep the following information in mind while searching for California to Ontario flight deals. Data was last updated 11 September 2025.

Round-trip from

C$ 229

One-way from

C$ 109

Popular in

December

Cheapest in

May

Average price

C$ 402

Good round-trip deal

C$ 180 or less

Good one-way deal

C$ 210 or less
WestJet
  • WestJet
  • 30/10-6/11
  • 2 total stops
  • 17h 50m total
  • California to Ontario
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WestJet
  • WestJet
  • 6/10
  • 1 total stop
  • 13h 28m total
  • California to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 107 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from California to Ontario.
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Price to beat on a one-way flight from California to Ontario.
Search Deals

Find flight deals from California to Ontario

Cheapest flights from California to Ontario
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2025.

Thu 30/103:45 p.m.LAS - YYZ
Nonstop4h 15mMultiple Airlines
Thu 6/119:40 a.m.YYZ - LAS
2 stops13h 35mMultiple Airlines
Deal found 11/9C$ 229
Wed 22/1011:10 p.m.LAX - YYZ
Nonstop4h 49mWestJet
Sun 26/108:00 a.m.YYZ - LAX
2 stops14h 50mWestJet
Deal found 11/9C$ 229
Mon 20/106:05 p.m.LAX - YYZ
1 stop9h 07mMultiple Airlines
Tue 21/1010:40 a.m.YYZ - LAX
Nonstop5h 20mMultiple Airlines
Deal found 11/9C$ 230
Sat 11/106:20 p.m.LAS - YYZ
1 stop8h 52mWestJet
Sat 18/102:00 p.m.YYZ - LAS
1 stop9h 21mWestJet
Deal found 11/9C$ 231
Thu 9/102:00 p.m.LAX - YYZ
Nonstop4h 50mMultiple Airlines
Fri 24/107:45 p.m.YYZ - LAX
Nonstop5h 26mMultiple Airlines
Deal found 9/9C$ 231
Tue 21/108:00 a.m.LAS - YYZ
1 stop9h 52mMultiple Airlines
Tue 28/109:35 a.m.YYZ - LAS
Nonstop5h 07mMultiple Airlines
Deal found 11/9C$ 233
Fri 10/1011:10 p.m.LAX - YYZ
Nonstop4h 50mWestJet
Sat 25/101:30 p.m.YYZ - LAX
1 stop11h 16mWestJet
Deal found 9/9C$ 233
Fri 17/1010:55 p.m.LAS - YYZ
Nonstop4h 25mMultiple Airlines
Wed 22/109:45 a.m.YYZ - LAS
Nonstop4h 54mMultiple Airlines
Deal found 11/9C$ 234
Fri 10/106:05 p.m.LAX - YYZ
1 stop9h 47mWestJet
Fri 24/107:45 p.m.YYZ - LAX
Nonstop5h 26mWestJet
Deal found 9/9C$ 234
Tue 7/108:00 a.m.LAS - YYZ
2 stops13h 31mWestJet
Tue 21/1012:00 p.m.YYZ - LAS
2 stops12h 29mWestJet
Deal found 11/9C$ 236
Fri 17/107:00 a.m.LAX - YYZ
2 stops14h 31mWestJet
Tue 21/108:00 a.m.YYZ - LAX
2 stops13h 09mWestJet
Deal found 10/9C$ 236
Thu 16/1012:35 p.m.LAS - YYZ
Nonstop4h 23mWestJet
Mon 27/109:40 a.m.YYZ - LAS
2 stops11h 31mWestJet
Deal found 11/9C$ 237

Cheapflights Fare Finder

 
Customize your flight search to find flights from California 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 California to Ontario that are best for you.

Fly from

California

Fly to

Ontario

Route

Depart

Return

Price

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 16/10

12:35 p.m.-7:58 p.m.

Nonstop4h 23m

Toronto Pearson Intl

Tue 21/10

9:30 a.m.-11:20 a.m.

Nonstop4h 50m

C$ 234

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 16/10

3:55 p.m.-6:12 a.m.

2 stops11h 17m

Toronto Pearson Intl

Sun 19/10

6:30 a.m.-3:01 p.m.

2 stops11h 31m

C$ 258

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Tue 25/11

3:45 p.m.-11:00 p.m.

Nonstop4h 15m

Toronto Pearson Intl

Fri 28/11

7:55 p.m.-10:02 p.m.

Nonstop5h 07m

C$ 283

Los AngelesToronto

LAX - YTZ

LAXYTZ

Los Angeles

Fri 24/10

10:30 p.m.-11:31 a.m.

2 stops10h 01m

Toronto Island

Fri 31/10

12:30 p.m.-8:50 p.m.

1 stop11h 20m

C$ 290

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 23/10

12:35 p.m.-7:58 p.m.

Nonstop4h 23m

Toronto Pearson Intl

Thu 23/10

10:25 p.m.-8:21 p.m.

1 stop24h 56m

C$ 290

Los AngelesToronto

LAX - YYZ

LAXYYZ

Los Angeles

Wed 8/10

11:10 p.m.-6:59 a.m.

Nonstop4h 49m

Toronto Pearson Intl

Sun 19/10

9:00 a.m.-8:21 p.m.

2 stops14h 21m

C$ 291

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Mon 20/10

9:10 p.m.-6:13 a.m.

1 stop30h 03m

Toronto Pearson Intl

Wed 22/10

10:00 a.m.-5:34 p.m.

1 stop10h 34m

C$ 297

Los AngelesToronto

LAX - YYZ

LAXYYZ

Los Angeles

Sat 11/10

7:00 a.m.-8:52 p.m.

1 stop10h 52m

Toronto Pearson Intl

Thu 16/10

10:00 a.m.-8:21 p.m.

2 stops13h 21m

C$ 298

Los AngelesToronto

LAX - YYZ

LAXYYZ

Los Angeles

Mon 6/10

12:35 p.m.-6:52 a.m.

2 stops15h 17m

Toronto Pearson Intl

Sat 11/10

1:30 p.m.-9:46 p.m.

1 stop11h 16m

C$ 298

Los AngelesToronto

LAX - YYZ

LAXYYZ

Los Angeles

Wed 15/10

6:05 p.m.-6:52 a.m.

1 stop9h 47m

Toronto Pearson Intl

Sat 18/10

8:00 a.m.-5:16 p.m.

2 stops12h 16m

C$ 298

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 California to Ontario

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

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

Currently, January is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 168). Flying from California 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 CA to ON?

Find hourly flight availability from California 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.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from California to Region of Ontario as you normally would.

Weekly flight availability from California to Region of Ontario

Explore weekly flight availability from California 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 USCA to CAON are scheduled on a Wednesday (22 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (17 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.
See what other customers who have flown with Porter Airlines,Air Transat, andUnited Airlines from California to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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 Transat
7.7
Good
438 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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.
WestJet
7.2
Good
3,091 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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

Entertainment

7.0

Food

7.6

Boarding

8.1

Comfort

7.9

Overall

7.9

Crew

8.6

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 California to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    A quick flight from California to Region of Ontario can take about 4h 15m. WestJet provides one of the quickest options available for as low as C$ 283. Airlines will cover a distance of 3119 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    C$ 111 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on WestJet and Air Canada, with prices starting from C$ 119 and C$ 127, respectively.

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

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

  • How can I find direct flights from California to Ontario?

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

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

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

    Currently, January is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 168). Flying from California 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for California to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from California to Ontario

Discover the top 5 airlines that operate flights from California 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
Porter AirlinesCheapestC$ 146AverageC$ 481FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 190AverageC$ 627FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 205AverageC$ 535FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 217AverageC$ 372FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air TransatCheapestC$ 240AverageC$ 666FlexibilityNo cancel feeOn-time50%
Search Air Transat 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 California to Ontario?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from California today with Cheapflights!

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

Cheapflights helps you find that perfect flight to Ontario from California by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Certainly. Search results for flights to Ontario from California shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from California today and book when prices fit your budget.

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