HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Las Vegas

$22+ Cheap flights from Ontario to Las Vegas (ONT - LAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAS
Jan 28 — Feb 41
Tue 1/28
Tue 2/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Las Vegas with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Ontario to Las Vegas Harry Reid Intl are usually found in April or October, booked 90 days in advance, depart on a Monday or Sunday and return on a Tuesday

Cheap flight deals from Ontario to Las Vegas

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Las Vegas (LAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$47
(Cheapflightsfares)

One-way from

$29
(Cheapflightsfares)

Popular in

February

Cheapest in

April

Average price

$87

Good round-trip deal

$76 or less

Good one-way deal

$57 or less
Provider with most accurate pricing for Ontario-Las Vegas Harry Reid Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Las Vegas Harry Reid Intl flights.
Search Deals
From Ontario to Las Vegas Harry Reid Intl
Search Deals
One-way flight from Ontario to Las Vegas Harry Reid Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Las Vegas Harry Reid Intl.
Search Deals
Price to beat on a one-way flight from Ontario to Las Vegas Harry Reid Intl.
Search Deals

Find flight deals from Ontario to Las Vegas

Cheapest flights from Ontario to Las Vegas
Explore the most affordable flight options available from Ontario to Las Vegas. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2025.

This Frontier deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/67:56 amONT - LAS
Nonstop1h 11mFrontier
Fri 2/286:20 amLAS - ONT
Nonstop1h 06mFrontier
Deal found 1/23$47
This Southwest deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/275:20 amONT - LAS
1 stop3h 45mSouthwest
Thu 3/2712:30 pmLAS - ONT
Nonstop1h 05mSouthwest
Deal found 1/22$142

Find flights from Ontario to Las Vegas within your budget

Customize your flight search to find flights from Ontario to Las Vegas that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 23, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 3/14

10:44 am-11:58 am

Nonstop1h 14m

Las Vegas Harry Reid Intl

Sun 3/16

6:20 am-7:26 am

Nonstop1h 06m

$47

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 3/27

5:20 am-9:05 am

1 stop3h 45m

Las Vegas Harry Reid Intl

Thu 3/27

12:30 pm-1:35 pm

Nonstop1h 05m

$142

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 2/20

9:35 pm-10:48 pm

Nonstop1h 13m

$22

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/25

6:45 am-7:50 am

Nonstop1h 05m

$69

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 3/4

10:05 am-4:10 pm

1 stop6h 05m

$117

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 3/4

11:45 am-9:27 pm

1 stop9h 42m

$147

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 3/19

6:00 am-12:45 am

1 stop18h 45m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/22

Compare providers for flights from Ontario to Las Vegas

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Las Vegas in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy2 starsTrust Score*3 stars
CheapOairPrice Accuracy2 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
AranGrantPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Las Vegas flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Las Vegas flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Las Vegas flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Las Vegas flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Las Vegas flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Ontario to Las Vegas flights

Find out what our experts recommend to make the most of your Ontario to Las Vegas trip
Airlines
Frontier

Frontier offers Zone 1 boarding with a carry-on bag or special fare bundle purchase.


Frontier's UpFront Plus seats guarantee an empty middle seat for added comfort.

Read more about Frontierby Marisa Garcia
Airports
ONT

ONT offers quick security checks compared to LAX, making it a convenient choice for travelers seeking a hassle-free departure experience.

Read more about ONTby Bill Fink
LAS

For a smooth arrival at LAS, rideshare pickups are in the parking garage, so request your ride closer to the garage to avoid long waits.

Read more about LASby Ramsey Qubein
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LAS

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

Best time to book a flight from Ontario to Las Vegas

Have a flexible travel schedule? Discover the best time to fly to Las Vegas from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Ontario to Las Vegas

Get recent, data-driven insights about flights from Ontario to Las Vegas including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Las Vegas. Price data was last updated on January 17, 2025.

The price you pay for your flight from Ontario to Las Vegas may vary depending on when you book. For the best chance of a lower fare, look to book 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ontario to Las Vegas?

Currently, August is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of $198). Flying from Ontario to Las Vegas in March is currently the most expensive (average of $269). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to LAS?

Find hourly flight availability from Ontario to Las Vegas. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 23, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to Las Vegas at noon. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Las Vegas. Price data was last updated on January 21, 2025.

Travelers seeking maximum savings on their Ontario to Las Vegas flight should consider departing on Monday mornings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Las Vegas by month

Plan your trip to Las Vegas by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Las Vegas ranges from 0.1 - 0.8 inches per month. February is typically the wettest month, when rainfall can reach 0.8 in. May is typically the driest time to visit Las Vegas when rainfall is around 0.1 in.

Temperature in Las Vegas by month

Plan your trip to Las Vegas by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Las Vegas, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 93.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Las Vegas

Get insights into the airlines that provide service to Las Vegas. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Las Vegas. Reviews last updated January 23, 2025.
Peruse reviews from past customers who have flown with Frontier and Southwest from Ontario to Las Vegas to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
4,647 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,699 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,508 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
8,970 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Related info for your journey

Find useful and relevant information for your journey from Ontario to Las Vegas. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Ontario to Las Vegas?

    Las Vegas Harry Reid Intl is the airport most travelers will use when flying to Las Vegas from Ontario. Booking flights from Ontario (ONT) to Harry Reid Intl (LAS) should be relatively easy as there are 6 daily flights to Las Vegas from 5 different airlines. 1h 05m is how long a flight from Ontario to Las Vegas Harry Reid Intl will take if you book a nonstop flight.

  • How popular is this Ontario to Las Vegas flight route?

    The Ontario to Las Vegas Harry Reid Intl flight path was viewed by 356 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Ontario to Las Vegas round-trip?

    Currently priced at $47, Frontier will fly you from Ontario to Las Vegas and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Southwest for as low as $142. Users have found that Frontier is 50% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Ontario to Las Vegas one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $29. However, be on the lookout for offers from Southwest and American Airlines, as they are both options that can get you from Ontario to Las Vegas for a low price.

  • What are the cheapest flights from Ontario to Las Vegas?

    Looking for the cheapest flight from Ontario to Las Vegas? While on average our users pay $107, our data indicates the cheapest price to be $22. The most popular route (Ontario - Las Vegas Harry Reid Intl), is priced around $37.

  • Can I find deals for flights from Ontario to Las Vegas that include hotel bookings?

    Yes. In addition to deals on Ontario to Las Vegas flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Las Vegas?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Las Vegas.

  • Can I find deals for business class flights from Ontario to Las Vegas?

    Yes. Cheapflights offers flight deals from Ontario to Las Vegas by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, August is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of $198). Flying from Ontario to Las Vegas in March is currently the most expensive (average of $269). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Henderson
Paradise
Sunrise Manor
North Las Vegas
Kingman
Winchester
Primm
Mesquite
Needles
Mount Charleston
Pahrump

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Las Vegas

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
Santa Ana to Las Vegas flights
Burbank to Las Vegas flights
San Jose to Las Vegas flights
Oakland to Las Vegas flights
Sacramento to Las Vegas flights
San Diego to Las Vegas flights
Fresno to Las Vegas flights
Los Angeles to Reno flights
Reno to Las Vegas flights
Burbank to Reno flights
Stockton to Las Vegas flights
Ontario to Reno flights
Long Beach to Las Vegas flights
San Francisco to Reno flights
Palm Springs to Las Vegas flights
San Diego to Reno flights
Santa Ana to Reno flights
Santa Rosa to Las Vegas flights
San Luis Obispo to Las Vegas flights
Oakland to Reno flights
Las Vegas to Reno flights
San Jose to Reno flights
Santa Barbara to Las Vegas flights
Long Beach to Reno flights
Monterey to Las Vegas flights
Medford to Las Vegas flights
Bakersfield to Las Vegas flights
Santa Monica to Las Vegas flights
Fresno to Reno flights
Sacramento to Reno flights
Palm Springs to Reno flights
Arcata to Las Vegas flights
San Luis Obispo to Reno flights
Redding to Las Vegas flights
Santa Barbara to Reno flights
Santa Maria to Las Vegas flights
Medford to Reno flights
Yuma to Las Vegas flights
Monterey to Reno flights
Bakersfield to Reno flights
Ontario to Twin Falls flights
Santa Rosa to Reno flights
Tijuana to Las Vegas flights
San Francisco to Twin Falls flights
San Francisco to Elko flights
Sacramento to Twin Falls flights
Concord to Las Vegas flights

Top 5 airlines flying from Ontario to Las Vegas

Discover the top 5 airlines that operate flights from Ontario to Las Vegas. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$37Average$76FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$38Average$208FlexibilityNo cancel feeOn-time75%
FrontierCheapest$41Average$92FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$176Average$250FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$199Average$458FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.