$34 Cheap Flights from Ontario (ONT) to Las Vegas (LAS)

View $34 flight on Tue, May 27, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)

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Find available prices by choosing your travel dates.

Cheap Flights from Ontario to Las Vegas (ONT-LAS)

Prices were available within the past 7 days and start at $34 for one-way flights and $55 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Jun 14 - Sat, Jun 14
ONT
Ontario
LAS
Las Vegas
$55 Roundtrip, found 4 days ago
$55
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sat, Jun 14 from Ontario to Las Vegas, returning Sat, Jun 14, priced at $55 found 4 days ago
Frontier Airlines
Thu, May 29 - Thu, May 29
ONT
Ontario
LAS
Las Vegas
$63 Roundtrip, found 5 hours ago
$63
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Thu, May 29 from Ontario to Las Vegas, returning Thu, May 29, priced at $63 found 5 hours ago
Frontier Airlines
Thu, May 29 - Fri, May 30
ONT
Ontario
LAS
Las Vegas
$68 Roundtrip, just found
$68
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, May 29 from Ontario to Las Vegas, returning Fri, May 30, priced at $68 just found
Frontier Airlines
Fri, May 23 - Fri, May 23
ONT
Ontario
LAS
Las Vegas
$73 Roundtrip, found 9 hours ago
$73
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Fri, May 23 from Ontario to Las Vegas, returning Fri, May 23, priced at $73 found 9 hours ago
Frontier Airlines
Sun, May 18 - Tue, May 20
ONT
Ontario
LAS
Las Vegas
$74 Roundtrip, just found
$74
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, May 18 from Ontario to Las Vegas, returning Tue, May 20, priced at $74 just found
Frontier Airlines
Sun, Jun 8 - Mon, Jun 9
ONT
Ontario
LAS
Las Vegas
$78 Roundtrip, found 1 hour ago
$78
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sun, Jun 8 from Ontario to Las Vegas, returning Mon, Jun 9, priced at $78 found 1 hour ago
Frontier Airlines
Wed, May 14 - Fri, May 16
ONT
Ontario
LAS
Las Vegas
$80 Roundtrip, just found
$80
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, May 14 from Ontario to Las Vegas, returning Fri, May 16, priced at $80 just found
Frontier Airlines
Sat, Jun 21 - Sat, Jun 21
ONT
Ontario
LAS
Las Vegas
$83 Roundtrip, found 3 hours ago
$83
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Jun 21 from Ontario to Las Vegas, returning Sat, Jun 21, priced at $83 found 3 hours ago
Frontier Airlines
Sat, May 17 - Sun, May 18
ONT
Ontario
LAS
Las Vegas
$84 Roundtrip, just found
$84
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 17 from Ontario to Las Vegas, returning Sun, May 18, priced at $84 just found
Frontier Airlines
Tue, May 6 - Sat, May 24
ONT
Ontario
LAS
Las Vegas
$86 Roundtrip, found 1 day ago
$86
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, May 6 from Ontario to Las Vegas, returning Sat, May 24, priced at $86 found 1 day ago
Flights from Ontario (ONT) to Las Vegas (LAS)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Harry Reid Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$54
Distance
196 mi

Ontario to Las Vegas Flights

The cheapest times to fly from Ontario to Las Vegas

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Las Vegas are during the month of June. You can find some of the cheapest flights from Ontario to Las Vegas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Las Vegas

Sunday is one of the best days to book for cheap flights from Ontario to Las Vegas: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario to Las Vegas

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Las Vegas in 2025. You can also book with separate airlines for your outbound and return journeys, from $34 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Las Vegas flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Las Vegas airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) cost?
Cheap return fares from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) start from $53. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving ONT on May 6 2025 and touching down at LAS. The price was last updated on April 28 2025 and has not changed since.
What is the cheapest month to fly from ONT to LAS?
The cheapest flights from ONT to LAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
You can fly directly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) on a Southwest Airlines flight.
What is the cheapest airline that flies from ONT to LAS?
Currently, the cheapest carrier operating one-way flights from ONT to LAS is Frontier Airlines. You can book a seat on this route from $29. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ONT on June 14 2025. Prices were last updated on April 28 2025 and have not changed since.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
When jetting out of Los Angeles - Ontario Intl. Airport (ONT), you can choose from an average of 7 daily nonstop flights to Harry Reid Intl. Airport (LAS).
What are the most popular departure times for flights from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
The 6 AM departures from ONT to LAS see the highest demand. Greater demand means you’ll likely pay more for these departures. If you want to save money, book during off-peak hours.
What day of the week has the most flights from ONT to LAS?
Friday has the most flights from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS). Consider jetting off on this day and you’ll have the best chance of finding a schedule that works for you.
What is the earliest flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
The first flight of the day taking off from Los Angeles - Ontario Intl. Airport (ONT) is at around 6:05AM UTC-8. Hop on this flight and you’ll touch down at Harry Reid Intl. Airport (LAS) at approximately 7:10AM UTC-8. The total flight duration is 1h 5m.
How long does it take to fly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
Typically, it takes 1 hour and 7 minutes to fly the 200 mi from ONT to LAS.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
To avoid possible delays on the Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) route, aim to fly before 3 PM. Later departures have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Las Vegas from Los Angeles - Ontario Intl. Airport (ONT)?
Harry Reid Intl. Airport (LAS) is the only airport in Las Vegas with direct flights from Los Angeles - Ontario Intl. Airport (ONT). Compare your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) last-minute?
Last-minute fares from ONT to LAS are generally more expensive. For the best prices, start searching for flights as early as possible. That said, if you can play around with your travel dates, it’s possible to land a cheap ticket just before your departure.
Is it cheaper to book an ONT to LAS flight and hotel package?
Compared with arranging flights and hotels separately, booking an ONT to LAS flight and hotel package with Expedia could result in significant savings. What’s more, managing everything in one place takes the hassle out of planning your trip. Simply pick your flights and select from our extensive range of stays, then customize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
You can usually cancel or reschedule your ONT to LAS flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find more details on our Customer Service portal.

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