LAS - ONT

$44 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 7/8. 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
1 adult, Economy, 0 bags

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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Everything you should know

Cheapest round-trip
$64
Typical prices: $136-$78
Frontier
Tue 9/22Wed 9/23
LAS - ONT • Non-stop
Cheapest one-way
$44
Typical prices: $68-$138
Frontier
Wed 7/8
LAS - ONT • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest's free carry-on policy adds value to fares.
Use Omnitrans Bus Route 61 for budget travel from ONT.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $64 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Frontier and Southwest. Average duration is 1h 04m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 31% price drop
Most popular
Good to know
Good to know
+1
+1
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+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Las Vegas to Ontario

Tue, Sep 22 - Wed, Sep 23
Frontier Logo
7:45 pm - 8:54 pm
LAS
-
ONT
1h 09mnonstop
Frontier Logo
9:49 pm - 10:58 pm
ONT
-
LAS
1h 09mnonstop
$64Frontier
Tue, Jul 7 - Tue, Aug 4
Frontier Logo
7:00 am - 8:03 am
LAS
-
ONT
1h 03mnonstop
Frontier Logo
1:38 pm - 2:49 pm
ONT
-
LAS
1h 11mnonstop
$65Frontier
Tue, Jul 14 - Wed, Jul 15
Frontier Logo
7:00 am - 8:03 am
LAS
-
ONT
1h 03mnonstop
Frontier Logo
3:40 pm - 4:51 pm
ONT
-
LAS
1h 11mnonstop
$66Frontier
Tue, Jun 16 - Tue, Jun 23
Frontier Logo
6:43 pm - 7:51 pm
LAS
-
ONT
1h 08mnonstop
Frontier Logo
3:34 pm - 4:46 pm
ONT
-
LAS
1h 12mnonstop
$67Frontier
Tue, Jun 16 - Wed, Jun 24
Frontier Logo
8:00 am - 9:07 am
LAS
-
ONT
1h 07mnonstop
Frontier Logo
3:34 pm - 4:46 pm
ONT
-
LAS
1h 12mnonstop
$68Frontier
Mon, Sep 21 - Tue, Sep 22
Frontier Logo
9:10 am - 10:21 am
LAS
-
ONT
1h 11mnonstop
Frontier Logo
2:58 pm - 4:08 pm
ONT
-
LAS
1h 10mnonstop
$87Frontier
Wed, Jun 17 - Tue, Jun 23
Frontier Logo
1:55 pm - 3:08 pm
LAS
-
ONT
1h 13mnonstop
Frontier Logo
1:33 pm - 2:44 pm
ONT
-
LAS
1h 11mnonstop
$88Frontier
Wed, Aug 12 - Wed, Aug 19
Frontier Logo
2:05 pm - 3:14 pm
LAS
-
ONT
1h 09mnonstop
Frontier Logo
1:27 pm - 2:38 pm
ONT
-
LAS
1h 11mnonstop
$89Frontier
Tue, Jun 16 - Wed, Jun 24
Frontier Logo
8:00 am - 9:07 am
LAS
-
ONT
1h 07mnonstop
Frontier Logo
3:34 pm - 4:46 pm
ONT
-
LAS
1h 12mnonstop
$90Frontier
Wed, Aug 12 - Sat, Aug 15
Frontier Logo
7:00 am - 8:03 am
LAS
-
ONT
1h 03mnonstop
Frontier Logo
11:52 am - 1:02 pm
ONT
-
LAS
1h 10mnonstop
$99Frontier
Booking Insights

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.

How much is a round-trip flight from Las Vegas to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Las Vegas to Ontario departing in September.

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 Wednesday and more expensive on a Sunday. On your return trip to Las Vegas, you should consider flying back on a Sunday, and avoid Thursdays 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 January, where tickets cost $87 (return) on average. On the other hand, the most expensive months are March and April, where the average cost of round-trip tickets is $186 and $158 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, which saves you about 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Expert advice

Expert advice for your flight from Las Vegas to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Harriet Baskas

Harriet Baskas

Expert on LAS

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$44
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly and prices are also 18% lower on average.
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 $44 for a one-way ticket and $64 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?

    Delta, Alaska Airlines, JetBlue, and American Airlines 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 Boeing 737 MAX 8 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 $305 and an overall rating of 7.9, Southwest is the most popular choice. Frontier is also a great choice for the route, with an average price of $108 and an overall rating of 5.6.

  • 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.

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 $101 or less one-way and $126 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.

Prefer to fly direct from Las Vegas to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Las Vegas Harry Reid Intl 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

Reviews of the top airlines flying 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.
7.9
SouthwestOverall score based on 4270 reviews
7.0Food
7.5Entertainment
8.1Boarding
8.6Crew
8.0Comfort
Airline reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

4.0 OkayAnonymous, May 2026
MDW - LAX
Read more Southwest reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The seat was not comfortable. 1D. My back was sore all night and the next day.

The new boarding process was easy and straightforward. Very pleasant.

It was as expected and I was grateful for the wheel chair help and ease of use.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Boarding was easy. The seats are small and fairly uncomfortable

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

baggage clamed had to wait over a hour and half for all people on my flight it was terrible

Both legs of the flight were changed. The day of the flight and length of the trip.

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

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

Information on your arrival and departure airports