LAS - ONT

$40 Find Cheap Flights from Las Vegas to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Las Vegas to Ontario departing on 4/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Las Vegas to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Las Vegas to Ontario, as well as popular online travel agencies
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Cheap Flight Deals from Las Vegas to Ontario (LAS-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Las Vegas to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Las Vegas to Ontario

KAYAK's recommended round-trip deals from the most popular airlines that fly from Las Vegas to Ontario.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
1:53 pm - 3:04 pmLAS-ONT
1h 11mnonstop
9:39 pm - 10:53 pmONT-LAS
1h 14mnonstop
$80Frontier
Find Deal
Tue, Apr 15 - Tue, Apr 15
6:20 am - 7:25 amLAS-ONT
1h 05mnonstop
2:43 pm - 3:53 pmONT-LAS
1h 10mnonstop
$84Frontier
Find Deal
Mon, Apr 7 - Mon, Apr 7
11:25 am - 12:30 pmLAS-ONT
1h 05mnonstop
6:10 am - 10:35 amONT-LAS
4h 25m1 stop
$107Southwest
Find Deal
Wed, Apr 16 - Wed, Apr 30
7:05 pm - 8:10 pmLAS-ONT
1h 05mnonstop
11:00 am - 4:15 pmONT-LAS
5h 15m2 stops
$112Southwest
Find Deal
Wed, Apr 16 - Wed, Apr 30
6:00 am - 11:59 amLAS-ONT
5h 59m1 stop
7:20 pm - 10:38 pmONT-LAS
3h 18m1 stop
$199American Airlines
Find Deal
Thu, Apr 17 - Sun, Apr 20
12:29 pm - 3:59 pmLAS-ONT
3h 30m1 stop
7:20 pm - 10:38 pmONT-LAS
3h 18m1 stop
$309American Airlines
Find Deal
Thu, Apr 10 - Sun, Apr 13
2:56 pm - 11:58 pmLAS-ONT
9h 02m2 stops
7:00 am - 2:59 pmONT-LAS
7h 59m2 stops
$333Alaska Airlines
Find Deal
Wed, Apr 23 - Wed, Apr 30
2:00 pm - 11:59 pmLAS-ONT
9h 59m2 stops
6:00 am - 4:40 pmONT-LAS
10h 40m1 stop
$377Alaska Airlines
Find Deal
Fri, Apr 25 - Sun, Apr 27
3:30 pm - 10:55 pmLAS-ONT
7h 25m1 stop
6:00 am - 12:49 amONT-LAS
18h 49m1 stop
$443United Airlines
Find Deal
Mon, Apr 7 - Sun, Apr 20
12:59 am - 10:00 pmLAS-ONT
21h 01m1 stop
6:00 am - 5:33 pmONT-LAS
11h 33m1 stop
$453United Airlines
Find Deal
Fri, May 9 - Sun, May 11

KAYAK's insights & trends for Las Vegas to Ontario flights

Get data-powered insights and trends into flights from Las Vegas to Ontario to help you find the cheapest flights, the best time to fly and much more.
Find cheap flights to Ontario
Find cheap flights to Ontario

Planning a trip from Las Vegas to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from Las Vegas to Ontario?

The average price of all round-trip flights from Las Vegas to Ontario clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Ontario on a Tuesday and more expensive on a Sunday. On your return trip to Las Vegas, you should consider flying back on a Sunday, and avoid Fridays for better deals.

What is the cheapest month to fly from Las Vegas to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Las Vegas to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Las Vegas to Ontario is September, where tickets cost $56 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $100 and $82 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Las Vegas to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Las Vegas to Ontario, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

January

High season

March

Cheapest flight

$40
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 44% increase in price.
Flight from Las Vegas to Ontario

When to book flights from Las Vegas to Ontario

Are your dates flexible? Find out the best times to travel from Las Vegas to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Las Vegas to Ontario

  • Where can passengers sleep at ONT airport?

    The Sheraton Gateway Hotel at Ontario International Airport is the only hotel that is physically located inside the Ontario International Airport. It provides weary passengers with the opportunity to rejuvenate themselves by sleeping, swimming, showering, and working out. Day usage charges are available.

  • Are there any kid-friendly amenities at ONT airport?

    A nursing room, which can be found in Terminal 3 near the Duty-Free shop as well as at Gate B1, offers mothers a quiet place to breastfeed their children in private. Chairs, changing tables, and sinks may be found in each and every nursing room.

  • How can I get to downtown Ontario from ONT airport?

    The trip from Ontario International Airport to Union Station in the heart of downtown Toronto on the Union Pearson Express takes just 25min. It loads at Terminals 1 and 2.

  • How do I get from downtown Las Vegas to Harry Reid International Airport?

    Since downtown Las Vegas is just approximately 20min away by vehicle from the airport, you can simply use a cab or ridesharing service like Uber to get there. There is access to LAS through public transit, which will take around 30min.

  • What is the cheapest flight from Las Vegas to Ontario?

    In the last 3 days, the lowest price for a flight from Las Vegas to Ontario was $40 for a one-way ticket and $80 for a round-trip.

  • Do I need a passport to fly between Las Vegas and Ontario?

    A passport is not required to fly from Las Vegas to Ontario.

  • Which airlines offer Wi-Fi service onboard planes from Las Vegas to Ontario?

    Alaska Airlines, Delta, American Airlines, and JetBlue offer inflight Wi-Fi service on the Las Vegas to Ontario flight route.

  • Which aircraft models fly most regularly from Las Vegas to Ontario?

    The Airbus A320neo is the aircraft model that flies most regularly on the Las Vegas to Ontario flight route.

  • On which days can I fly direct from Las Vegas to Ontario?

    There are nonstop flights from Las Vegas to Ontario on a daily basis.

  • Which is the best airline for flights from Las Vegas to Ontario, Southwest or Frontier?

    The two airlines most popular with KAYAK users for flights from Las Vegas to Ontario are Southwest and Frontier. With an average price for the route of $231 and an overall rating of 8.0, Southwest is the most popular choice. Frontier is also a great choice for the route, with an average price of $68 and an overall rating of 6.0.

  • How does KAYAK find such low prices on flights from Las Vegas to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Las Vegas to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Las Vegas to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Las Vegas is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Las Vegas to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Las Vegas with another airline. Booking your flights between Las Vegas and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Las Vegas to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Las Vegas up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Las Vegas to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $42 or less one-way and $75 or less round-trip.
  • At the Harry Reid International Airport in Las Vegas (LAS), there are specific areas inside as well as outside of the terminals where passengers may take their dogs to discharge themselves. The airport offers post-security covered inside rooms as well as outdoor designated enclosures where travelers may take their animals to relieve themselves. These places are available to travelers who are traveling with pets or service animals. There are three locations within the airport that serve as checkpoints once passengers have cleared security: the A/B/C Gates of Terminal 1, the D Gates of Terminal 1, and the west end of Terminal 3 at Gate E11.
  • Are you intending to be in Ontario for a longer period of time and need to park your vehicle at the Harry Reid International Airport (LAS) while you are away? When it comes to parking over an extended period of time at LAS, you have two options: the covered parking garage or the uncovered parking lot.
  • Do you plan to arrive in Las Vegas ahead of time and are looking for things to keep yourself occupied before your flight departs? Attempt to unwind by visiting one of the lounges, such as the Club LAS. The Centurion Club is also available. These may be found at Terminal 1 on the ground floor and in the main terminal on the higher level, respectively.
  • Services for travelers with limited mobility are available at both Harry Reid International Airport and Ontario International Airport. Before or after your flight, any airport can help you with wheelchair rentals and getting through the terminal. If you want to use these amenities, please notify your airline in advance.
  • When you arrive at the Ontario Airport (ONT), proceed to the auto-rental facility to pick up your rental vehicle. There is no need to take a shuttle to a separate place since the vehicle rental agency is right there in the airport. The automobile rental service is available at any time.
See more tips

Prefer to fly direct from Las Vegas to Ontario?

Find which airlines fly direct from Las Vegas Harry Reid Intl Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Las Vegas Harry Reid Intl to Ontario

Monday

Frontier, Southwest

Frontier, Southwest

Tuesday

Frontier, Southwest

Frontier, Southwest

Wednesday

Frontier, Southwest

Frontier, Southwest

Thursday

Frontier, Southwest

Frontier, Southwest

Friday

Frontier, Southwest

Frontier, Southwest

Saturday

Frontier, Southwest

Frontier, Southwest

Sunday

Frontier, Southwest

Frontier, Southwest

See more direct flights

Direct returns

Ontario to Las Vegas Harry Reid Intl

Monday

Frontier, Southwest

Frontier, Southwest

Tuesday

Frontier, Southwest

Frontier, Southwest

Wednesday

Frontier, Southwest

Frontier, Southwest

Thursday

Frontier, Southwest

Frontier, Southwest

Friday

Frontier, Southwest

Frontier, Southwest

Saturday

Frontier, Southwest

Frontier, Southwest

Sunday

Frontier, Southwest

Frontier, Southwest

See more direct flights
See more direct flights

Top 3 airlines serving from Las Vegas to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Las Vegas to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Las Vegas to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4273 reviews
8.1Comfort
7.6Entertainment
8.6Crew
8.2Boarding
7.1Food
Airline reviews

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

10.0 ExcellentPaul, Mar 2025BNA - BUR
Read more Southwest reviews

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

The movies using Southwest WiFi kept pausing and I had to restart multiple times.

This was a nicer flight - not fully booked and so we were able to spread out.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

The plane arrived 25 minutes late, and the Wi-Fi was slower than it usually is.

Forget beverage, they didn't even have water for half the passangers?

No leg room AT all extremely uncomfortable flight water even cost 5 dollars

Seats are very uncomfortable pls make your seats comfortable pls pls pls

I was comfortable because I upgraded. I would not have been comfortable in economy. It was a short flight so there was limited food service and no inflight entertainment.

Seats were surprisingly comfortable, and crew was polite. I did not like the baggage fee prices, the minimal amount of flight choices for my area and the difficulty of the self service bag drop.

Delayed fight LAS to LAX. OK, fog in LA, not your fault. But all your staff, onboard in in lounge, speak so fast, enunciate so poorly and often have a accent that it is impossible to understanding anything they are saying.

It was smooth. It’ll always be annoying that nothing is included in the booking (seats and bags particularly).

No carry on available to purchase at any point, charged for water, no power to charge phone. Other discount airlines have this.

I could not print my boarding passes and had to see an agent. However, the agents were very friendly and helpful.

It was cancelled unexpectedly so we rented a car and drove home.

This airline is effective for the price you pay, do not expect anything extra at all. You have to pay extra for seat assignment , carry on luggage, food, you name it ...and even if you pay extra for better seats they do not recline.

This was a full flight and I was in Zone 1, however upon boarding, several other zones went in ahead of me, leaving no overhead cabin space near my seat. This created a challenging disembarkment process.

Everything went as planned. Crew was great. Seats were still not that comfortable.

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

food not having to pay for it, reclining seat would be nice, more leg room, HEAT!!!!!!!

An absolutely fraudulent experience. Extremely unprofessional. Terrible in all ways possible. Rude staff, flight attendants, and deceptive "policies."

Very easy with the app to board and staff skills

The plane was clean, the crew was friendly and helpful. It’s a low cost airline so there was no food, drinks or in flight entertainment but we didn’t expect any of these things. In the room for improvement department, they should install USB ports in seats to charge mobile devices.

I was surprised that all baggage, including carry on, were charged. Each additional bag went up in cost. Really disappointed in the additional costs.

Charges unexpected. For seat that didnt recline. Please reverse extra seat and carryon charge. Bad business that is a bait and switch.

I couldn’t check in because the app didn’t work. It took 3 Frontier employees at the counter to get me checked in. Flight left 3 hours after departure time

Everything you need to know for your flight from Las Vegas to Ontario

Information on your arrival and departure airports

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