ONT - LAS

$29 Find Cheap Flights from Ontario to Las Vegas

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Las Vegas departing on 3/14. 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 Las Vegas

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Las Vegas, 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 Ontario to Las Vegas, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$59
Typical prices: $78-$166
Frontier
Thu 3/5Mon 3/9
ONT - LAS • Non-stop
Cheapest one-way
$29
Typical prices: $44-$80
Frontier
Sat 3/14
ONT - LAS • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest's two free checked bags suit family travel.
ONT's streamlined security speeds up departures.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to Las Vegas
Watch video
Watch video
Watch video
Watch video
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
July
Cheapest • 13% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+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 Las Vegas!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Las Vegas 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 Ontario to Las Vegas

Thu, Mar 5 - Mon, Mar 9
Frontier Logo
3:24 pm - 4:36 pm
ONT
-
LAS
1h 12mnonstop
Frontier Logo
2:28 pm - 3:37 pm
LAS
-
ONT
1h 09mnonstop
$59Frontier
Wed, Mar 11 - Thu, Mar 12
Frontier Logo
2:23 pm - 3:37 pm
ONT
-
LAS
1h 14mnonstop
Frontier Logo
12:00 pm - 1:11 pm
LAS
-
ONT
1h 11mnonstop
$60Frontier
Thu, Apr 16 - Mon, Apr 20
Frontier Logo
8:59 pm - 10:08 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
6:59 pm - 8:04 pm
LAS
-
ONT
1h 05mnonstop
$61Frontier
Wed, Mar 4 - Sat, Mar 7
Frontier Logo
7:17 pm - 8:26 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
5:05 pm - 6:15 pm
LAS
-
ONT
1h 10mnonstop
$62Frontier
Wed, Mar 4 - Wed, Mar 11
Frontier Logo
7:17 pm - 8:26 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
7:55 pm - 9:03 pm
LAS
-
ONT
1h 08mnonstop
$63Frontier
Mon, Mar 16 - Tue, Mar 17
Frontier Logo
11:17 am - 12:30 pm
ONT
-
LAS
1h 13mnonstop
Frontier Logo
12:17 pm - 1:28 pm
LAS
-
ONT
1h 11mnonstop
$64Frontier
Sun, Apr 19 - Wed, Apr 22
Frontier Logo
11:44 am - 12:59 pm
ONT
-
LAS
1h 15mnonstop
Frontier Logo
12:30 pm - 1:40 pm
LAS
-
ONT
1h 10mnonstop
$65Frontier
Sat, Mar 28 - Sat, Apr 4
Frontier Logo
7:31 pm - 8:40 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
10:30 am - 11:39 am
LAS
-
ONT
1h 09mnonstop
$67Frontier
Tue, Apr 14 - Thu, Apr 16
Frontier Logo
2:44 pm - 3:56 pm
ONT
-
LAS
1h 12mnonstop
Frontier Logo
6:59 pm - 8:04 pm
LAS
-
ONT
1h 05mnonstop
$68Frontier
Mon, Mar 30 - Wed, Apr 1
Frontier Logo
9:49 pm - 10:59 pm
ONT
-
LAS
1h 10mnonstop
Frontier Logo
7:55 pm - 9:00 pm
LAS
-
ONT
1h 05mnonstop
$69Frontier
Booking Insights

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

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

Find cheap flights to Las Vegas
Find cheap flights to Las Vegas

Planning a trip from Ontario to Las Vegas? 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.

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

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

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

The average price of all round-trip flights from Ontario to Las Vegas clicked on KAYAK for each day over the last 12 months.

When flying from Ontario to Las Vegas, you should consider leaving on a Sunday and avoid Thursdays if you are looking for the best rates. For your return to Ontario, you’ll find the best rates on Wednesdays and the most expensive ones on Sundays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Las Vegas, 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 Ontario to Las Vegas is July, where tickets cost $111 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $140 and $139 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Las Vegas, 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 Ontario to Las Vegas, you should book around 2 weeks before departure, which saves you about 34% 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 Ontario to Las Vegas

 
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.

KAYAK's tips to save more on a Ontario to Las Vegas flight

When planning a trip from Ontario to Las Vegas, there are several ways to make the journey more cost-effective. Generally, Tuesdays are the cheapest day of the week to fly, and October, November, and April are the most affordable months.

Cheapest Route: Stick to the Ontario to Las Vegas route for the best prices.

Booking Advance: Book your flight at least 170 days in advance to get the best deals.

Budget Airline: Consider flying with Frontier, as it is generally the cheapest airline for this route.

Direct Flights: Direct flights are more expensive, so consider flights with layovers to save money.

AI-powered; AI can make mistakes.

Good to know

Low seasonJanuary
Cheapest flight$29
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Ontario to Las Vegas

When to book flights from Ontario to Las Vegas

Are your dates flexible? Find out the best times to travel from Ontario to Las Vegas 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 Ontario to Las Vegas

  • Is it possible to book direct flights from Ontario to Las Vegas?

    There are many direct flights between Ontario and Las Vegas that are offered each day and these are typically operated by Frontier Airlines. Quite a few flights require passengers to have a layover as well, and you will find that these are usually serviced by Alaska Airlines or American Airlines.

  • How can I travel from downtown Ontario to Ontario International Airport?

    An easy way to get to Ontario International Airport from the city center is by driving or taking a taxi, which will generally take around 10 to 15min depending on what traffic is like at the time. You can also take public transportation, such as bus line 61, which will take you between 15 and 20min on average.

  • What transportation options are there for going from Harry Reid International Airport to downtown Las Vegas?

    To head to downtown Las Vegas once you have landed at Harry Reid International Airport, you can always drive or take a taxi, which will normally take you 20 to 25min. Public transportation is also an option, and bus line CX will bring you to the city center in approximately 45 to 50min.

  • What services are available for passengers with reduced mobility?

    There are employees at Ontario International Airport that are ready to help passengers with limited mobility through security, to their gate, and while boarding the plane. Free wheelchairs are also available for anyone in need. At both Ontario International Airport and Harry Reid International Airport, there are also elevators and ramps, as well as public restrooms that are accessible for individuals with reduced mobility.

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

    In the last 3 days, the lowest price for a flight from Ontario to Las Vegas was $29 for a one-way ticket and $59 for a round-trip.

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

    No

  • Which airports will I be using when flying from Ontario to Las Vegas?

    When flying out of Ontario you will be using Ontario. You will be landing at Las Vegas, also known as Las Vegas Harry Reid Intl.

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

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

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

    The Airbus A321neo is the aircraft model that flies most regularly on the Ontario to Las Vegas flight route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Las Vegas are Southwest and Spirit Airlines. With an average price for the route of $239 and an overall rating of 8.0, Southwest is the most popular choice. Spirit Airlines is also a great choice for the route, with an average price of $90 and an overall rating of 6.3.

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

    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 Ontario to Las Vegas.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Las Vegas from Ontario 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 Ontario to Las Vegas?

    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 Las Vegas with an airline and back to Ontario with another airline. Booking your flights between Ontario and LAS 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 Ontario to Las Vegas?

    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 Las Vegas from Ontario 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 Ontario to Las Vegas

  • Looking for a cheap flight? 25% of our users found flights on this route for $95 or less one-way and $95 or less round-trip.
  • Those that will be traveling with small children will want to keep in mind that Ontario International Airport (ONT) has two baby care rooms that can be found in terminals 2 and 4. These rooms are equipped with changing tables, outlets, comfortable seating, trash cans, running water, and doors that lock.
  • If you’re flying with a dog, you most likely will want to give them the opportunity to stretch their legs after your flight has landed at Harry Reid International Airport (LAS). Head to one of the designated outdoor pet relief areas that are located just outside terminals 1 and 3.
  • Travelers that have some time to kill before their flight departs from Ontario International Airport can always relax in the Escape Lounge. This lounge has multiple locations, found in terminals 2 and 4, and passengers of all airlines can purchase entry tickets.
  • To rent a car once you have landed at Harry Reid International Airport, head to the McCarran Rent-A-Car Center, which you can go to from the airport by taking one of the free blue and white shuttle buses. At this center, you will find offices for several companies, including Alamo, Budget, and Hertz.
  • While there are no hotels directly at Ontario International Airport, there are a few nearby lodging options if you happen to have a flight that departs early in the morning. For example, the Candlewood Suites Ontario Convention Center is around a 5min drive away and has a free airport shuttle for guests.

Prefer to fly direct from Ontario to Las Vegas?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Ontario to Las Vegas Harry Reid Intl.
Find which airlines fly direct from Ontario Airport to Las Vegas Harry Reid Intl Airport, which days they fly and book direct flights.

Direct departures

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

Direct returns

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

Reviews of the top 3 airlines serving from Ontario to Las Vegas

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Las Vegas. 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 Ontario to Las Vegas? 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 4280 reviews
7.5Entertainment
8.6Crew
7.0Food
8.0Comfort
8.1Boarding
Airline reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

2.0 MediocreDavid, Feb 2026
SAN - LAS
Read more Southwest reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

3 hour delay. Had to change plans and was still delayed.

We got exit row seats both flights. Everything was running on time

Flight was fine other than there was a gate change that I was not notified of. By chance I happened to check my phone and saw the change, otherwise, we would have missed our connecting flight.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

This was a horrible experience for both KAYAK and Spirit. My flight was canceled with no alternative flight option. I paid $600 for a last minute flight and didn't receive an email from KAYAK regarding the cancelled flight until hours after it was canceled. Never again for either.

I purchased extra legroom so I will be comfortable but the guy behind me is a big guy who keeps on moving and since he is big I can feel his movement at the back of my chair.

For the price of the fare, there really isn’t much to complain about.

I arrived two hours early, and at 9:20 I was still queuing for security.

The seats are the most uncomfortable seats I’ve ever sat in. Don’t believe I’ll ever fly spirit again!!

No leg room. My knee was sore for a day.

Flight was delayed. (To be excepted because of TSA shortage) I’m super short and still struggled with leg room, there was no screen, and the seat didn’t recline at all.

The Hawaiian lady that boarded me was rude and the one help me a the ticket counter was rude

Vegas is such a quick flight that amenities aren’t the important part, in my opinion. Just get me there efficiently and safely, and that’s exactly what they did!

The flight was severely delayed due to the missing flight attendants.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Boarding in Orlando was not good. Giant mob at the gate, should have been lines.

The ticketing agents were rude but then we had a great gate agent very nice we had to ride a buss out to where the plane was parked but it was in some back corner of the airport when we got to the plane the captain who was great btw was cleaning the plane because the same rude ticketing agent told them they we not contracted to vacuum the plane. The ride to las Vegas was fine We had a connecting flight to Dallas. The flight was fine but when we arrived in Dallas everyone who flew on any frontier airlines the picked up bags from baggage claim D15 had to wait over a hour for their bags to start we arrived at 11:30pm ish to the gate we didn't leave the baggage clamed till 12:50 am very not happy and i used to fly frontier 4 times a week for work in Denver i will not be using them again

I missed a flight because of a delay. I had to buy a new ticket through Southwest.

My flight was delayed by two hours which made it so that I would miss my layover flight. I stood in line for customer service for over an hour and when I reached the agent she told me to scan a QR code and it'll give me options. I wasn't offered any help, guidance or compensation, only told that I have options but that I had to figure it all out myself. I was refunded part of the trip and had to buy an expensive same day ticket from another airline in order to get home. I will never fly Frontier again.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Although an hour and a half early was told by staff at check in they had overbooked and could not check us in for the flight.

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

Other airlines flying from Ontario to Las Vegas

Flights from the other most popular airlines that fly from Ontario to Las Vegas according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.