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$36+ Cheap flights from Las Vegas to Ontario (LAS - ONT)

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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
LAS — ONT
May 15 — May 221
Fri 5/15
Fri 5/22
1 adult, Economy
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Cheapflights Tip: The best prices from Las Vegas Harry Reid Intl to Ontario are usually found in January or May, booked 81 days in advance, depart on a Wednesday or Saturday and return on a Sunday

Cheap flight deals from Las Vegas to Ontario

Cheapest flights from Las Vegas to Ontario
Explore the most affordable flight options available from Las Vegas to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 15, 2026.

This Frontier deal was found by Cheapflights users on 4/13. 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.
Mon 5/116:45 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Mon 5/1111:36 am
ONT
-
LAS
Nonstop1h 11m
Frontier
Deal found 4/13$51
This Kiwi.com deal was found by Cheapflights users on 4/13. 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.
Fri 5/86:45 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Sun 5/104:04 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
Deal found 4/13$55
This Frontier deal was found by Cheapflights users on 4/14. 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 5/146:22 pm
LAS
-
ONT
Nonstop1h 10m
Frontier
Mon 5/188:44 am
ONT
-
LAS
Nonstop1h 15m
Frontier
Deal found 4/14$57
This Trip.com deal was found by Cheapflights users on 4/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/141:59 pm
LAS
-
ONT
Nonstop1h 10m
Frontier
Thu 5/213:30 pm
ONT
-
LAS
Nonstop1h 13m
Frontier
Deal found 4/12$58
This Super.com deal was found by Cheapflights users on 4/10. 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 5/17:00 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Tue 5/54:39 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
Deal found 4/10$65
This Super.com deal was found by Cheapflights users on 4/13. 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.
Thu 6/116:43 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Mon 6/153:34 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Deal found 4/13$66
This Super.com deal was found by Cheapflights users on 4/10. 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 5/237:00 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Thu 5/283:30 pm
ONT
-
LAS
Nonstop1h 13m
Frontier
Deal found 4/10$74
This Kiwi.com deal was found by Cheapflights users on 4/10. 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.
Fri 5/17:00 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Sun 5/38:19 pm
ONT
-
LAS
Nonstop1h 09m
Frontier
Deal found 4/10$75
This Super.com deal was found by Cheapflights users on 4/14. 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 6/191:55 pm
LAS
-
ONT
Nonstop1h 13m
Frontier
Sun 6/213:34 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Deal found 4/14$76
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
Mon 7/66:40 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Mon 7/133:34 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Deal found 4/14$77
This Frontier deal was found by Cheapflights users on 4/11. 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.
Sun 7/121:56 pm
LAS
-
ONT
Nonstop1h 13m
Frontier
Mon 7/1311:43 am
ONT
-
LAS
Nonstop1h 08m
Frontier
Deal found 4/11$85

Find flight deals from Las Vegas to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Las Vegas (LAS) to Ontario (ONT). 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 April 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$51
(Frontier)

One-way from

$36
(Kiwi.com)

Popular in

March

Cheapest in

January

Average price

$129

Good round-trip deal

$93 or less

Good one-way deal

$88 or less
Provider with most accurate pricing for Las Vegas Harry Reid Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Las Vegas Harry Reid Intl-Ontario flights.
Search Deals
From Las Vegas Harry Reid Intl to Ontario
Search Deals
One-way flight from Las Vegas Harry Reid Intl to Ontario
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Las Vegas Harry Reid Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Las Vegas Harry Reid Intl to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Las Vegas to Ontario 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 April 15, 2026.
Use the filters below to find and compare flights from Las Vegas to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 5/15

12:29 am-10:05 am

1 stop9h 36m

Ontario

Mon 5/18

8:44 am-9:59 am

Nonstop1h 15m

$99

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 5/16

5:40 am-11:05 am

1 stop5h 25m

Ontario

Sat 5/16

5:50 pm-9:40 pm

1 stop3h 50m

$197

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 5/21

4:50 pm-9:15 pm

1 stop4h 25m

Ontario

Sun 5/24

2:55 pm-7:45 pm

2 stops4h 50m

$239

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 5/5

5:55 pm-10:59 pm

1 stop5h 04m

Ontario

Tue 5/12

5:00 am-10:48 am

1 stop5h 48m

$257

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 5/8

5:55 am-10:55 am

1 stop5h 00m

Ontario

Sat 5/9

9:25 am-3:40 pm

2 stops6h 15m

$268
Quickest round-trip

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 10/9

7:00 am-12:05 pm

1 stop5h 05m

Ontario

Fri 10/9

6:10 pm-7:15 pm

Nonstop1h 05m

$271

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 5/9

1:25 pm-7:10 pm

2 stops5h 45m

Ontario

Sun 5/10

7:40 pm-12:05 am

1 stop4h 25m

$283

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 7/25

12:30 pm-9:55 pm

2 stops9h 25m

Ontario

Sat 8/1

1:20 pm-7:05 pm

1 stop5h 45m

$294

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 5/9

5:15 am-5:52 pm

2 stops12h 37m

Ontario

Sun 5/10

5:00 am-1:09 pm

1 stop8h 09m

$322

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 6/6

4:33 pm-10:02 pm

1 stop5h 29m

Ontario

Tue 6/9

6:10 am-11:49 am

1 stop5h 39m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/11

Showing 1-10 of 23 resultsSorted by cheapest first
1
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3

Compare providers for flights from Las Vegas to Ontario

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 Las Vegas to Ontario in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy1 starTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice 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 Las Vegas-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Las Vegas-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Las Vegas-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Las Vegas-Ontario 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 Las Vegas-Ontario 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 Las Vegas to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Las Vegas 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 Las Vegas to Ontario

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

Use this chart to determine the optimal time to book a round-trip flight from Las Vegas to Ontario. Price data was last updated on April 10, 2026.

To ensure you get the cheapest price possible for a flight from Las Vegas to Ontario, you should look to book at least 77 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, March is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $29). Flying from Las Vegas to Ontario in February is currently the most expensive (average of $48). 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 LAS to ONT?

Find hourly flight availability from Las Vegas to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 15, 2026.

When flying from Las Vegas to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 25% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Las Vegas to Ontario. Price data was last updated on April 11, 2026.

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

How much does it cost to fly round-trip from Las Vegas to Ontario?

The best insider tips for Las Vegas to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Las Vegas to Ontario trip
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

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

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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated April 15, 2026.
Read through reviews of airlines operating flights from Las Vegas to Ontario, such as Southwest and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,330 reviews

Overall

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,330 reviews
Southwest
8.0
Very good
4,330 reviews

Overall

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
2,988 reviews
Southwest
8.0
Very good
4,330 reviews

Overall

8.0

Crew

8.6

Food

7.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

Find useful and relevant information for your journey from Las Vegas to Ontario. 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 Las Vegas to Ontario?

    If you wish to fly to Ontario from Las Vegas, then you need to book flights from Las Vegas Harry Reid Intl to Ontario. There are 4 flights from Harry Reid Intl (LAS) to Ontario (ONT) per day to choose from. Flights to Ontario from Harry Reid Intl are available from 2 different airlines, which means you should have some options if you want to compare airfare deals. 1h 00m is how long a nonstop flight from Las Vegas to Ontario typically takes.

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

    Within the past month, 25 users have taken a look at flights from Las Vegas Harry Reid Intl to Ontario.

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

    There are many flights that can get you from Las Vegas to Ontario in 5h 04m. Fly via Frontier, Southwest, or United Airlines to get the fastest option. The distance between Las Vegas and Ontario is about 197 mi. This flight may include one or multiple stops.

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

    Cheapflights users have booked flights from Las Vegas to Ontario round-trip from $55. Another airline that can offer you cheap pricing is Southwest. You may be able to fly from Las Vegas to Ontario for 53% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from Las Vegas to Ontario are Spirit Airlines ($28), Frontier ($29), and Southwest ($48).

  • What are the most reliable airlines from Las Vegas to Ontario?

    The top 3 most reliable airlines when flying from Las Vegas to Ontario are Frontier (81%), Volaris (80%) and Southwest (73%).

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

    On average you can expect to pay $162 for a flight from Las Vegas to Ontario. The cheapest flight overall is $49 while the most popular route, (Las Vegas Harry Reid Intl - Ontario) is currently priced at $56.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Las Vegas to Ontario 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 Las Vegas to Ontario?

    Currently, March is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $29). Flying from Las Vegas to Ontario in February is currently the most expensive (average of $48). 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

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.

Top 2 airlines flying from Las Vegas to Ontario

Discover the top 2 airlines that operate flights from Las Vegas to Ontario. 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 April 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$105FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$84Average$306FlexibilityNo cancel feeOn-time63%

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