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Cheap flights from California to Ontario from C$ 102

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 19/1. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — YYZ
28 Nov — 5 Dec1
1 adult
1 adult, Economy, 0 bags

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 29 October 2025.

Round-trip from

C$ 247

One-way from

C$ 102

Popular in

December

Cheapest in

May

Average price

C$ 426

Good round-trip deal

C$ 234 or less

Good one-way deal

C$ 147 or less
WestJet
  • WestJet
  • 9/1-11/1
  • Nonstop
  • 9h 31m total
  • California to Ontario
Search Deals
WestJet
  • WestJet
  • 19/1
  • Nonstop
  • 4h 22m total
  • California to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from California to Ontario.
Search Deals
Price to beat on a one-way flight from California to Ontario.
Search Deals

Find flight deals from California to Ontario

Enter your travel dates to find the best prices.

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 29 October 2025.

Thu 11/121:10 p.m.LAS - YYZ
Nonstop4h 22mWestJet
Sun 14/128:00 p.m.YYZ - LAS
Nonstop5h 09mWestJet
Deal found 28/10C$ 291
Thu 27/1112:40 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Wed 3/129:35 a.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 298
Fri 12/1212:40 p.m.LAS - YYZ
Nonstop4h 15mMultiple Airlines
Sun 14/128:00 p.m.YYZ - LAS
Nonstop5h 09mMultiple Airlines
Deal found 27/10C$ 299
Tue 2/123:45 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Wed 10/129:35 a.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 26/10C$ 300
Thu 20/1111:05 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Sun 23/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 28/10C$ 307
Tue 18/1112:40 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Mon 24/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 309
Thu 20/1111:05 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Thu 27/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 312
Tue 18/1112:40 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Thu 27/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 313
Fri 21/1111:05 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Sat 22/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 314
Tue 18/1112:40 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Sun 23/117:55 p.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 316
Fri 28/118:00 a.m.LAS - YYZ
1 stop8h 36mMultiple Airlines
Thu 4/127:55 p.m.YYZ - LAS
Nonstop5h 07mMultiple Airlines
Deal found 29/10C$ 317
Thu 20/1111:05 p.m.LAS - YYZ
Nonstop4h 15mPorter Airlines
Wed 3/129:35 a.m.YYZ - LAS
Nonstop5h 07mPorter Airlines
Deal found 27/10C$ 319

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 29 October 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

Fri 12/12

12:40 p.m.-7:55 p.m.

Nonstop4h 15m

Toronto Pearson Intl

Sun 14/12

8:00 p.m.-10:09 p.m.

Nonstop5h 09m

C$ 299

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Fri 28/11

8:00 a.m.-7:36 p.m.

1 stop8h 36m

Toronto Pearson Intl

Thu 4/12

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

Nonstop5h 07m

C$ 317

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 23/4

11:20 a.m.-11:11 p.m.

1 stop8h 51m

Toronto Pearson Intl

Sun 26/4

2:00 p.m.-8:20 p.m.

1 stop9h 20m

C$ 324

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 19/2

11:25 p.m.-6:43 a.m.

Nonstop4h 18m

Toronto Pearson Intl

Sun 22/2

8:00 p.m.-10:12 p.m.

Nonstop5h 12m

C$ 324

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Tue 18/11

12:40 p.m.-7:55 p.m.

Nonstop4h 15m

Toronto Pearson Intl

Mon 24/11

1:30 p.m.-8:15 p.m.

1 stop9h 45m

C$ 334

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Thu 4/12

1:10 p.m.-5:58 a.m.

2 stops13h 48m

Toronto Pearson Intl

Mon 8/12

12:30 p.m.-9:31 p.m.

2 stops12h 01m

C$ 338

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Wed 24/12

6:05 a.m.-11:20 p.m.

2 stops14h 15m

Toronto Pearson Intl

Sun 4/1

8:00 p.m.-10:09 p.m.

Nonstop5h 09m

C$ 344

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Wed 24/12

11:20 a.m.-12:26 a.m.

1 stop10h 06m

Toronto Pearson Intl

Sun 4/1

8:00 p.m.-10:09 p.m.

Nonstop5h 09m

C$ 348

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Sat 15/11

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

Nonstop4h 15m

Toronto Pearson Intl

Wed 3/12

9:35 a.m.-11:42 a.m.

Nonstop5h 07m

C$ 349

Las VegasToronto

LAS - YYZ

LASYYZ

Las Vegas Harry Reid Intl

Wed 24/12

6:05 a.m.-11:20 p.m.

2 stops14h 15m

Toronto Pearson Intl

Sat 3/1

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

Nonstop5h 07m

C$ 351

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/10

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, December is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 27). Flying from California to Region of Ontario in March is currently the most expensive (average of C$ 170). 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 29 October 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 23% on flights from California to Region of Ontario by exploring options for tickets at noon.

What is the cheapest day to fly from California to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from California to Ontario. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their California to Region of Ontario flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 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
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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
9,001 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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
3,148 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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
10,371 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Crew

8.6

Comfort

8.0

Entertainment

7.0

Overall

8.0

Food

7.6

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 8h 51m. WestJet provides one of the quickest options available for as low as C$ 324. 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$ 115 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Porter Airlines and United Airlines, with prices starting from C$ 134 and C$ 148, 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, December is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 27). Flying from California to Region of Ontario in March is currently the most expensive (average of C$ 170). 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 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 29 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 148AverageC$ 488FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 164AverageC$ 618FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 199AverageC$ 622FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 219AverageC$ 372FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air TransatCheapestC$ 303AverageC$ 769FlexibilityNo 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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