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$34+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAS
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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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.

Cheapflights Tip: The best prices from Ontario to Las Vegas Harry Reid Intl are usually found in March or February, booked 66 days in advance, depart on a Sunday or Monday and return on a Thursday

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 November 26, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$53
(Frontier)

One-way from

$34
(CheapOair)

Popular in

October

Cheapest in

March

Average price

$124

Good round-trip deal

$135 or less

Good one-way deal

$103 or less
Provider with most accurate pricing for Ontario-Las Vegas Harry Reid Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-Las Vegas Harry Reid Intl flights.
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From Ontario to Las Vegas Harry Reid Intl
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One-way flight from Ontario to Las Vegas Harry Reid Intl
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Highest demand for flights based on searches. 8% potential increase in price ($11 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($2 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Ontario to Las Vegas Harry Reid Intl.
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Price to beat on a one-way flight from Ontario to Las Vegas Harry Reid Intl.
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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 November 26, 2025.

This FlightHub deal was found by Cheapflights users on 11/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/178:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/25$56
This Kiwi.com deal was found by Cheapflights users on 11/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:15 amONT - LAS
Nonstop1h 07mFrontier
Tue 12/168:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/26$57
This CheapOair deal was found by Cheapflights users on 11/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/176:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/178:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/25$58
This CheapOair deal was found by Cheapflights users on 11/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/178:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/24$60
This CheapOair deal was found by Cheapflights users on 11/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:00 amONT - LAS
Nonstop1h 07mFrontier
Wed 1/78:45 amLAS - ONT
Nonstop1h 05mFrontier
Deal found 11/25$68
This Super.com deal was found by Cheapflights users on 11/26. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:15 amONT - LAS
Nonstop1h 07mFrontier
Thu 12/184:13 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 11/26$69
This Kiwi.com deal was found by Cheapflights users on 11/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/178:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/26$70
This Super.com deal was found by Cheapflights users on 11/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:15 amONT - LAS
Nonstop1h 07mFrontier
Mon 12/158:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/24$72
This CheapOair deal was found by Cheapflights users on 11/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:15 amONT - LAS
Nonstop1h 07mFrontier
Mon 12/158:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/25$73
This Gotogate deal was found by Cheapflights users on 11/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:15 amONT - LAS
Nonstop1h 07mFrontier
Fri 12/194:01 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 11/25$74
This Super.com deal was found by Cheapflights users on 11/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:15 amONT - LAS
Nonstop1h 07mFrontier
Mon 12/158:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 11/24$75

Cheapflights Fare Finder

 
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 November 26, 2025.
Use the filters below to find and compare flights from Ontario to Las Vegas that are best for you.

Fly from

Ontario

Fly to

Las Vegas

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 12/24

3:10 pm-4:15 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Thu 12/25

7:30 am-2:30 pm

1 stop7h 00m

$154

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 1/8

5:35 pm-10:05 pm

1 stop4h 30m

Las Vegas Harry Reid Intl

Sat 1/10

7:25 am-3:05 pm

2 stops7h 40m

$182

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 1/15

8:10 am-9:15 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 1/19

9:00 pm-10:05 pm

Nonstop1h 05m

$204

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 1/8

8:30 am-1:55 pm

1 stop5h 25m

Las Vegas Harry Reid Intl

Sun 1/11

5:30 am-9:05 am

1 stop3h 35m

$214

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 12/24

5:55 am-11:35 am

1 stop5h 40m

Las Vegas Harry Reid Intl

Sun 12/28

7:50 am-8:50 am

Nonstop1h 00m

$214

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 1/10

9:00 am-2:45 pm

2 stops5h 45m

Las Vegas Harry Reid Intl

Sun 1/11

5:30 am-9:05 am

1 stop3h 35m

$219

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 2/12

7:20 pm-11:05 pm

1 stop3h 45m

Las Vegas Harry Reid Intl

Sun 2/15

7:30 pm-8:30 pm

Nonstop1h 00m

$221

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 12/25

8:55 pm-9:55 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Sun 12/28

7:50 am-8:50 am

Nonstop1h 00m

$231

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 12/23

7:20 pm-11:20 pm

1 stop4h 00m

$69

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/3

7:15 am-2:46 pm

1 stop7h 31m

$81

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

Showing 1-10 of 20 results
1
2

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Las Vegas flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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.

Cheapflights Insights

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

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 November 21, 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 66 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, September is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of $37). Flying from Ontario to Las Vegas in July is currently the most expensive (average of $49). 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 November 26, 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 29% on your trip compared to booking a flight in the afternoon.

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 November 25, 2025.

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

The best insider tips for Ontario to Las Vegas flights

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.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Las Vegas trip
Airports
ONT

ONT offers quick security checks, making it a convenient choice over LAX for a stress-free departure.

Read more about ONTby Bill Fink
LAS

For a quick exit, request your rideshare closer to the LAS parking garage to avoid long waits.

Read more about LASby Ramsey Qubein
Our travel experts
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

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 November 26, 2025.
Peruse reviews from past customers who have flown with Southwest, Spirit Airlines, and Frontier from Ontario to Las Vegas to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,253 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,159 reviews
Southwest
8.0
Very good
4,253 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,100 reviews
Southwest
8.0
Very good
4,253 reviews

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 4 daily flights to Las Vegas from 3 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 408 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Las Vegas?

    Southwest can get you from Ontario to Las Vegas in just under 1h 05m. Your travel time will be generally consistent. Ontario and Las Vegas are separated by a distance of 197 mi. All flights are typically nonstop.

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

    Currently priced at $24, Spirit Airlines will fly you from Ontario to Las Vegas and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Southwest - these airlines can fly you to your destination from $47 and $97, respectively. Users have found that Spirit Airlines is 79% 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 Southwest, with whom users have recently found tickets for as low as $69. However, be on the lookout for offers from Frontier and Delta, 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 $158, our data indicates the cheapest price to be $49. The most popular route (Ontario - Las Vegas Harry Reid Intl), is priced around $57.

  • 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, September is the cheapest month in which you can book a flight from Ontario to Las Vegas (average of $37). Flying from Ontario to Las Vegas in July is currently the most expensive (average of $49). 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 Las Vegas?

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

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Top 3 airlines flying from Ontario to Las Vegas

Discover the top 3 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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$24Average$81FlexibilityNo cancel feeOn-time65%
FrontierCheapest$47Average$109FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$233FlexibilityNo cancel feeOn-time63%

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