$54+ Cheap flights from California to Ontario
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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from California to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 March 28, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $134 (Trip.com) |
One-way from | $54 (Cheapflightsfares) |
Popular in | December |
Cheapest in | September |
Average price | $345 |
Good round-trip deal | $255 or less |
Good one-way deal | $130 or less |
Find flight deals from California to Ontario
Cheapest flights from California to OntarioExplore 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 March 28, 2025.
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 March 28, 2025.
This Mytrip deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Trip.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from California to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Wed 4/9
11:25 pm-6:43 am
Nonstop4h 18m
Toronto Pearson Intl
Sat 4/12
7:25 pm-9:28 pm
Nonstop5h 03m
Los AngelesToronto
LAX - YYZ
LAXYYZ
Los Angeles
Mon 7/21
11:10 pm-7:00 am
Nonstop4h 50m
Toronto Pearson Intl
Wed 7/30
6:30 am-2:12 pm
1 stop10h 42m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Thu 4/17
10:35 pm-5:55 am
Nonstop4h 20m
Toronto Pearson Intl
Tue 4/22
7:25 pm-9:28 pm
Nonstop5h 03m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Thu 4/17
7:11 am-10:48 pm
1 stop12h 37m
Toronto Pearson Intl
Wed 4/23
8:10 pm-10:07 pm
Nonstop4h 57m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Wed 4/9
11:25 pm-6:43 am
Nonstop4h 18m
Toronto Pearson Intl
Sat 4/12
10:40 pm-11:55 am
1 stop16h 15m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Mon 4/7
12:30 am-12:43 pm
1 stop9h 13m
Toronto Pearson Intl
Tue 4/8
4:18 pm-8:29 pm
1 stop7h 11m
Los AngelesToronto
LAX - YYZ
LAXYYZ
Los Angeles
Fri 5/16
11:10 pm-7:00 am
Nonstop4h 50m
Toronto Pearson Intl
Thu 5/22
6:35 pm-8:59 pm
Nonstop5h 24m
Los AngelesMontreal
LAX - YUL
LAXYUL
Los Angeles
Thu 6/5
11:40 am-12:43 am
1 stop10h 03m
Montreal Pierre Elliott Trudeau Intl
Sat 6/7
7:00 am-2:12 pm
1 stop10h 12m
Los AngelesMontreal
LAX - YUL
LAXYUL
Los Angeles
Tue 5/13
11:40 am-12:43 am
1 stop10h 03m
Montreal Pierre Elliott Trudeau Intl
Tue 5/27
6:45 am-12:10 pm
1 stop8h 25m
Los AngelesToronto
LAX - YYZ
LAXYYZ
Los Angeles
Tue 5/6
1:10 pm-9:03 pm
Nonstop4h 53m
Toronto Pearson Intl
Sun 5/11
9:45 am-12:10 pm
Nonstop5h 25m
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.
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 $243). Flying from California to Region of Ontario in July is currently the most expensive (average of $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 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 March 28, 2025.
When flying from California 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 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 March 28, 2025.
The most flights from USCA to CAON are scheduled on a Thursday (14 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
Rainfall in Ontario by month
Plan your trip to Ontario by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.
Temperature in Ontario by month
Plan your trip to Ontario by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).
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 March 28, 2025.
Get a feel of what it's like to fly with Delta, Alaska Airlines and Porter Airlines from California to Ontario by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Food
Entertainment
Overall
Comfort
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
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.
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.
Top 7 airlines flying from California to Ontario
Discover the top 7 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 2,558,603 searches. Data last updated March 28, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$18 | Average$389 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$132 | Average$576 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$137 | Average$406 | FlexibilityNo cancel fee | On-time60% | |
| Cheapest$137 | Average$572 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$146 | Average$564 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$159 | Average$521 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$186 | Average$397 | FlexibilityNo cancel fee | On-time50% |