£107 Cheap Flights from Ontario Intl. Airport (ONT) to Las Vegas (LAS)

View £107 flight on Tue, 17 Nov 2026Opens in a new window

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

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Cheap Flights from Ontario Intl. Airport (ONT) to Las Vegas (LAS)

Prices were available within the past 7 days and start at £107 for one-way flights and £258 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, 26 Oct - Thu, 29 Oct
ONT
Ontario
LAS
Las Vegas
£258 Return, found 4 days ago
£258
Return
found 4 days ago
Select American Airlines flight, departing Mon, 26 Oct from Ontario to Las Vegas, returning Thu, 29 Oct, priced at £258 found 4 days ago
United
Mon, 26 Oct - Thu, 29 Oct
ONT
Ontario
LAS
Las Vegas
£266 Return, found 4 days ago
£266
Return
found 4 days ago
Select United flight, departing Mon, 26 Oct from Ontario to Las Vegas, returning Thu, 29 Oct, priced at £266 found 4 days ago
American Airlines
Sat, 23 May - Sun, 24 May
ONT
Ontario
LAS
Las Vegas
£273 Return, found 3 days ago
£273
Return
found 3 days ago
Select American Airlines flight, departing Sat, 23 May from Ontario to Las Vegas, returning Sun, 24 May, priced at £273 found 3 days ago
American Airlines
Tue, 17 Nov - Mon, 23 Nov
ONT
Ontario
LAS
Las Vegas
£276 Return, found 14 hours ago
£276
Return
found 14 hours ago
Select American Airlines flight, departing Tue, 17 Nov from Ontario to Las Vegas, returning Mon, 23 Nov, priced at £276 found 14 hours ago
American Airlines
Mon, 8 Jun - Fri, 12 Jun
ONT
Ontario
LAS
Las Vegas
£288 Return, found 5 days ago
£288
Return
found 5 days ago
Select American Airlines flight, departing Mon, 8 Jun from Ontario to Las Vegas, returning Fri, 12 Jun, priced at £288 found 5 days ago
American Airlines
Tue, 17 Nov - Mon, 23 Nov
ONT
Ontario
LAS
Las Vegas
£299 Return, found 14 hours ago
£299
Return
found 14 hours ago
Select American Airlines flight, departing Tue, 17 Nov from Ontario to Las Vegas, returning Mon, 23 Nov, priced at £299 found 14 hours ago
American Airlines
Mon, 26 Oct - Thu, 29 Oct
ONT
Ontario
LAS
Las Vegas
£302 Return, found 4 days ago
£302
Return
found 4 days ago
Select American Airlines flight, departing Mon, 26 Oct from Ontario to Las Vegas, returning Thu, 29 Oct, priced at £302 found 4 days ago
United
Sat, 23 May - Sun, 24 May
ONT
Ontario
LAS
Las Vegas
£310 Return, found 3 days ago
£310
Return
found 3 days ago
Select United flight, departing Sat, 23 May from Ontario to Las Vegas, returning Sun, 24 May, priced at £310 found 3 days ago
Alaska Airlines
Tue, 2 Jun - Sat, 6 Jun
ONT
Ontario
LAS
Las Vegas
£339 Return, found 2 days ago
£339
Return
found 2 days ago
Select Alaska Airlines flight, departing Tue, 2 Jun from Ontario to Las Vegas, returning Sat, 6 Jun, priced at £339 found 2 days ago
JetBlue Airways
Wed, 20 May - Sun, 24 May
ONT
Ontario
LAS
Las Vegas
£714 Return, found 1 hour ago
£714
Return
found 1 hour ago
Select JetBlue Airways flight, departing Wed, 20 May from Ontario to Las Vegas, returning Sun, 24 May, priced at £714 found 1 hour ago

Alternative airports near Las Vegas

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to McCarran Intl. LAS. Cheapest and Closest option available. Average driving time to city centre is 6 minutes. Flights from £423
LAS
McCarran Intl.
CheapestClosest
Average driving time to city centre6 min
Flights from £423

Frequently asked questions

What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
September is typically the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.), with average return fares of approximately £295. This is about 16% lower than the average price throughout the year. September often sees lower prices as the summer travel rush ends and before the holiday season begins, leading to reduced demand. Other cheap months to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) include February and August.
Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
Enter ONT to LAS and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
The best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) will differ from traveller to traveller. If you like to fly early, F9 offers early morning flights. If price is the most important factor, F9 typically offers the lowest fares. WN offers the most daily flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
The best time to fly from Los Angeles - Ontario Intl. (ONT) to Harry Reid Intl. (LAS) for a good balance of price and availability is typically September or February. Based on booking data from the past year, you can expect to find return flights for around £295 during these months. These periods often offer a good combination of lower fares and plenty of flight options, as they fall outside of peak holiday travel times.
How many flights per day from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
There are approximately 7 nonstop flights per day from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.). For even more choice, look at flights that include layovers, as there are around 61 connecting flights per day. Some common connection points include Sky Harbor Intl. (PHX), Sacramento Intl. (SMF), and Seattle - Tacoma Intl. (SEA).
What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
The earliest flight from Los Angeles - Ontario Intl. (ONT) to Harry Reid International Airport (LAS) typically departs at approximately 12:05 AM local time, operated by F9. This is a seasonal service active in May. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
You'll find the most flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Harry Reid International Airport (LAS) on a Friday, with around 55 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Alaska Airlines, and Delta Air Lines. Friday offers notably more flight options compared to other days of the week.
What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
The most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) are in the early morning, from 6am to 9am. About 21% of passengers prefer this time window. Southwest Airlines and Frontier Airlines offer flights during this window. Many travelers prefer these early flights because they allow you to arrive at your destination with plenty of time to start your day.
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
Direct flights from ONT to LAS usually take about 1 hour, traveling roughly 196 miles. If you opt for a connecting flight, expect to add around 4 hours 30 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
Select the "Business class" and "First class" filters when looking for ONT to LAS flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) flight with Expedia?
It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Las Vegas from Los Angeles - Ontario Intl. (ONT)?
From Los Angeles - Ontario Intl. (ONT), you can fly directly into Harry Reid International Airport (LAS) to reach Las Vegas. Some flights may connect through major hubs like Sacramento Intl. (SMF), Oakland Intl. (OAK), Norman Y. Mineta San Jose Intl. (SJC) before reaching Las Vegas. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) at the last minute?
Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) flight and hotel package?
Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.)?
If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Las Vegas, NV (LAS-Harry Reid Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ontario Intl. Airport
Destination airport
Harry Reid Intl.
Airlines serving
American Airlines, United
Return price
£258
Distance
314 km
Average flight time
1 hour 7 mins

Book with confidence

Compare flights from Ontario Intl. Airport to Las Vegas easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario Intl. Airport to Las Vegas. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Harry Reid Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Ontario Intl. Airport to Harry Reid Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Ontario Intl. Airport (ONT) to Harry Reid Intl. (LAS)

The easiest way to view the best deals on flights from Ontario Intl. Airport to Las Vegas today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Ontario Intl. Airport to Harry Reid Intl. start at just £258 and range up to £714.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Ontario Intl. Airport and Las Vegas
  • booking your flight during October, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ontario Intl. Airport to Las Vegas flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Ontario Intl. Airport to Harry Reid Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Ontario Intl. Airport to Las Vegas easily and book with confidence

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