$83+ 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 3/9. 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
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 January 27, 2026.
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 January 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Trip.com deal was found by Cheapflights users on 1/26. 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 Trip.com 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 1/27. 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 Trip.com deal was found by Cheapflights users on 1/26. 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 Trip.com 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 1/25. 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 FlightHub deal was found by Cheapflights users on 1/26. 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 Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com deal was found by Cheapflights users on 1/25. 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 1/25. 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 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 1/25. 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.
Find flight deals from California to Ontario
Keep the following information in mind while searching for California to Ontario flight deals. Data was last updated January 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $166 (Kiwi.com) |
One-way from | $83 (Kiwi.com) |
Popular in | December |
Cheapest in | June |
Average price | $350 |
Good round-trip deal | $245 or less |
Good one-way deal | $159 or less |
Cheapflights Fare Finder
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
Fri 3/27
11:25 pm-6:43 am
Nonstop4h 18m
Toronto Pearson Intl
Tue 3/31
9:35 am-11:42 am
Nonstop5h 07m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Wed 3/18
8:05 am-11:38 pm
2 stops12h 33m
Toronto Pearson Intl
Thu 3/19
8:00 pm-10:12 pm
Nonstop5h 12m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Wed 4/15
8:05 am-11:38 pm
2 stops12h 33m
Toronto Pearson Intl
Thu 4/16
10:00 am-6:13 pm
1 stop11h 13m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Fri 3/27
11:25 pm-6:43 am
Nonstop4h 18m
Toronto Pearson Intl
Tue 3/31
9:40 am-9:33 pm
2 stops14h 53m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Fri 3/6
9:15 pm-12:40 am
1 stop24h 25m
Toronto Pearson Intl
Wed 3/11
1:30 pm-9:33 pm
1 stop11h 03m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Thu 2/26
11:45 pm-7:00 am
Nonstop4h 15m
Toronto Pearson Intl
Thu 3/5
8:35 pm-10:42 pm
Nonstop5h 07m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Sun 2/15
9:00 am-9:44 pm
1 stop9h 44m
Toronto Pearson Intl
Thu 2/26
8:25 pm-10:31 pm
Nonstop5h 06m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Sat 2/14
9:00 am-8:30 pm
1 stop8h 30m
Toronto Pearson Intl
Tue 2/17
8:25 pm-10:31 pm
Nonstop5h 06m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Fri 2/27
11:25 pm-6:43 am
Nonstop4h 18m
Toronto Pearson Intl
Thu 3/5
4:00 pm-6:13 pm
1 stop29h 13m
Las VegasToronto
LAS - YYZ
LASYYZ
Las Vegas Harry Reid Intl
Fri 2/6
7:05 pm-6:58 am
1 stop8h 53m
Toronto Pearson Intl
Sun 2/8
1:30 pm-9:33 pm
1 stop11h 03m
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, June is the cheapest month in which you can book a flight from California to Region of Ontario (average of $74). Flying from California to Region of Ontario in December is currently the most expensive (average of $154). 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 January 27, 2026.
A simple way to save on the total cost of your ticket is to fly from California to Region of Ontario at noon. If you’re flexible enough to do this you can expect to save up to 47% on your trip compared to booking a flight in the morning.
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 January 24, 2026.
Travelers seeking maximum savings on their California to Region of Ontario flight should consider departing on Saturday at noon when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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 January 27, 2026.
The most flights from USCA to CAON are scheduled on a Monday (19 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from California 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 January 27, 2026.
Get a feel of what it's like to fly with Porter Airlines, Delta, and United Airlines from California to Ontario by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
Entertainment
Crew
Food
Overall
Comfort
Boarding
Reviews
Mohameed,Nov 2025
LAS - YYZ
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 January 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$101 | Average$327 | FlexibilityNo cancel fee | On-time60% | |
| Cheapest$101 | Average$519 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$103 | Average$322 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$114 | Average$353 | FlexibilityNo cancel fee | On-time50% | |
| Cheapest$122 | Average$482 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$130 | Average$425 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$256 | Average$556 | FlexibilityNo cancel fee | On-time71% |