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Cheap flights from Ontario to Las Vegas

ONT — LAS
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ontario to Las Vegas

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Las Vegas (LAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 11 September 2025.

Popular in

June

Cheapest in

October

Average price

C$ 129

Good round-trip deal

C$ 81 or less
Highest demand for flights based on searches. 11% potential increase in price (C$ 26 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Las Vegas Harry Reid Intl.
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Best time to book a flight from Ontario to Las Vegas

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

How far ahead should I book a flight from Ontario to Las Vegas?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Las Vegas. Price data was last updated on 29 August 2025.

Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Las Vegas. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario to Las Vegas?

Currently, January is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of C$ 212). Flying from Ontario to Las Vegas in August is currently the most expensive (average of C$ 291). 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 ONT to LAS?

Find hourly flight availability from Ontario to Las Vegas. 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.

One of the essential ways to save on airfare from Ontario to Las Vegas is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 69% on airfare.

Reviews of airlines servicing Las Vegas

Get insights into the airlines that provide service to Las Vegas. 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 Las Vegas. Reviews last updated 11 September 2025.
Get a feel of what it's like to fly with Frontier from Ontario to Las Vegas by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.8
Fair
3,177 reviews
Check prices

Crew

6.7

Boarding

6.1

Entertainment

4.4

Overall

5.8

Food

4.7

Comfort

5.5

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.
Frontier
5.8
Fair
3,177 reviews
Frontier
5.8
Fair
3,177 reviews
Check prices

Crew

6.7

Boarding

6.1

Entertainment

4.4

Overall

5.8

Food

4.7

Comfort

5.5

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Las Vegas. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Ontario to Las Vegas flight route?

    This flight path from Ontario to Las Vegas Harry Reid Intl was viewed by 7 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What is the cheapest airline to fly from Ontario to Las Vegas round-trip?

    Our cheapest airline available from Ontario to Las Vegas is Frontier. Our recent data shows that you can find tickets from as low as C$ 57 on this airline. Frontier is priced at 61% lower than the current average price of a flight leaving 3 months from now.

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

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

  • How can I find direct flights from Ontario to Las Vegas?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Las Vegas 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 Ontario to Las Vegas?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of C$ 212). Flying from Ontario to Las Vegas in August is currently the most expensive (average of C$ 291). 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

Travelling to a place near Las Vegas?

Book flights to Las Vegas if you plan to visit one of these locations
Henderson
Boulder City
North Las Vegas
Paradise

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Fly from Ontario to Las Vegas on these airlines

Choose from the following airlines for your flight from Ontario to Las Vegas. Flights are based on user searches made on Cheapflights and were last updated on 11 September 2025.
Frontier flights from Ontario to Las Vegas Harry Reid Intl

Top airline flying from Ontario to Las Vegas

Discover the top airline that operate flights from Ontario to Las Vegas. 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
FrontierCheapestC$ 57AverageC$ 81FlexibilityNo cancel feeOn-time62%
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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 Ontario to Las Vegas?

Cheapflights helps you search for flights from Ontario to Las Vegas via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Las Vegas for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Need flexible booking options for your flight to Las Vegas from Ontario? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Not ready to book yet? You can track prices for flights from Ontario to Las Vegas on Cheapflights with our Price Alert feature and get notified when better prices are available.

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