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$35+ 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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAS — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Find cheap flights from Las Vegas to Ontario 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”

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Cheapflights Tip: The best prices from Las Vegas Harry Reid Intl to Ontario are usually found in February or January, booked 38 days in advance, depart on a Thursday or Friday 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 December 12, 2025.

This Frontier deal was found by Cheapflights users on 12/9. 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.
Wed 12/318:13 pmLAS - ONT
Nonstop1h 04mFrontier
Wed 1/710:45 amONT - LAS
Nonstop1h 09mFrontier
Deal found 12/9$79
This CheapOair deal was found by Cheapflights users on 12/9. 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 12/308:13 pmLAS - ONT
Nonstop1h 04mFrontier
Tue 1/64:04 pmONT - LAS
Nonstop1h 07mFrontier
Deal found 12/9$80
This Frontier deal was found by Cheapflights users on 12/9. 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.
Wed 12/318:13 pmLAS - ONT
Nonstop1h 04mFrontier
Thu 1/88:14 pmONT - LAS
Nonstop1h 06mFrontier
Deal found 12/9$90
This Frontier deal was found by Cheapflights users on 12/9. 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.
Tue 12/308:13 pmLAS - ONT
Nonstop1h 04mFrontier
Mon 1/56:00 pmONT - LAS
Nonstop1h 11mFrontier
Deal found 12/9$91
This Super.com deal was found by Cheapflights users on 12/9. 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 12/308:13 pmLAS - ONT
Nonstop1h 04mFrontier
Wed 12/316:00 amONT - LAS
Nonstop1h 07mFrontier
Deal found 12/9$98
This Super.com deal was found by Cheapflights users on 12/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:13 pmLAS - ONT
Nonstop1h 04mFrontier
Thu 1/16:00 amONT - LAS
Nonstop1h 07mFrontier
Deal found 12/11$110
This CheapOair deal was found by Cheapflights users on 12/9. 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.
Fri 12/266:00 amLAS - ONT
1 stop18h 12mFrontier
Mon 1/263:22 pmONT - LAS
Nonstop1h 12mFrontier
Deal found 12/9$118
This CheapOair deal was found by Cheapflights users on 12/8. 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 12/314:06 pmLAS - ONT
Nonstop1h 09mFrontier
Thu 1/16:00 amONT - LAS
Nonstop1h 07mFrontier
Deal found 12/8$121
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
Thu 12/188:13 pmLAS - ONT
Nonstop1h 04mFrontier
Mon 12/226:00 pmONT - LAS
Nonstop1h 11mFrontier
Deal found 12/9$122
This CheapOair deal was found by Cheapflights users on 12/9. 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 12/238:13 pmLAS - ONT
Nonstop1h 04mFrontier
Thu 12/256:00 amONT - LAS
Nonstop1h 07mFrontier
Deal found 12/9$123
This Super.com deal was found by Cheapflights users on 12/8. 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 12/238:13 pmLAS - ONT
Nonstop1h 04mFrontier
Mon 12/296:00 amONT - LAS
Nonstop1h 07mFrontier
Deal found 12/8$128
This Frontier deal was found by Cheapflights users on 12/9. 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 12/298:13 pmLAS - ONT
Nonstop1h 04mFrontier
Wed 1/710:45 amONT - LAS
Nonstop1h 09mFrontier
Deal found 12/9$129

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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$48
(Super.com)

One-way from

$35
(Booking.com)

Popular in

November

Cheapest in

February

Average price

$91

Good round-trip deal

$80 or less

Good one-way deal

$84 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. 7% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 2025.
Use the filters below to find and compare flights from Las Vegas to Ontario that are best for you.

Fly from

Las Vegas

Fly to

Ontario

Route

Depart

Return

Price

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 2/21

8:13 pm-9:17 pm

Nonstop1h 04m

Ontario

Tue 2/24

8:30 am-9:36 am

Nonstop1h 06m

$56

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 1/21

1:01 pm-2:12 pm

Nonstop1h 11m

Ontario

Sun 1/25

8:27 pm-9:35 pm

Nonstop1h 08m

$57

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 1/13

4:45 pm-5:54 pm

Nonstop1h 09m

Ontario

Tue 1/20

3:07 pm-4:19 pm

Nonstop1h 12m

$58

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 1/8

6:30 am-7:36 am

Nonstop1h 06m

Ontario

Sun 1/11

7:19 pm-8:26 pm

Nonstop1h 07m

$58

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 1/22

9:00 am-10:09 am

Nonstop1h 09m

Ontario

Sun 1/25

5:21 pm-6:32 pm

Nonstop1h 11m

$59

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 1/8

6:30 am-7:36 am

Nonstop1h 06m

Ontario

Thu 1/15

4:34 pm-5:49 pm

Nonstop1h 15m

$60

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 1/16

6:30 am-7:37 am

Nonstop1h 07m

Ontario

Sun 1/18

2:34 pm-3:48 pm

Nonstop1h 14m

$63

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 12/30

8:13 pm-9:17 pm

Nonstop1h 04m

Ontario

Mon 1/5

6:00 pm-7:11 pm

Nonstop1h 11m

$91

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 1/21

1:01 pm-2:12 pm

Nonstop1h 11m

Ontario

Fri 1/23

5:41 pm-11:11 pm

1 stop5h 30m

$94

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 1/7

8:45 am-9:50 am

Nonstop1h 05m

Ontario

Thu 1/15

7:56 pm-8:57 am

1 stop13h 01m

$110

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 19 results
1
2

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 December.
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
CheapOairPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Las Vegas-Ontario flight deals on Cheapflights vs. CheapOair >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 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 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 December 5, 2025.

To ensure you get the cheapest price possible for a flight from Las Vegas to Ontario, you should look to book at least 38 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, February is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $30). Flying from Las Vegas to Ontario in September 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 December 12, 2025.

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 at noon, which can drop the price by up to 12% versus a flight in the afternoon.

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 December 6, 2025.

Travelers seeking maximum savings on their Las Vegas to Ontario flight should consider departing on Tuesday 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.

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
Airports
LAS

Try the self-service TSA screening at LAS for a quick and simple security experience before your flight.

Read more about LASBy Ramsey Qubein
ONT

Consider renting a car at ONT for convenient travel in Southern California, with quick access to I-10.

Read more about ONTBy Bill Fink
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 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 December 12, 2025.
Read through reviews of airlines operating flights from Las Vegas to Ontario, such as Southwest, Spirit Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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
8,178 reviews
Southwest
7.9
Good
4,253 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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 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 5 flights from Harry Reid Intl (LAS) to Ontario (ONT) per day to choose from. Flights to Ontario from Harry Reid Intl are available from 3 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, 43 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 1h 04m. Fly via Frontier to get the fastest option. The distance between Las Vegas and Ontario is about 197 mi. All flights are typically nonstop.

  • 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 $33. Other airlines that can offer you cheap pricing are Frontier, from $42, and Southwest, from $84. You may be able to fly from Las Vegas to Ontario for 67% 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 ($23), Frontier ($23), and Southwest ($48).

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

    On average you can expect to pay $117 for a flight from Las Vegas to Ontario. The cheapest flight overall is $40 while the most popular route, (Las Vegas Harry Reid Intl - Ontario) is currently priced at $49.

  • 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, February is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $30). Flying from Las Vegas to Ontario in September 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

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Alternative routes for Las Vegas to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Las Vegas to Ontario

Discover the top 3 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$42Average$97FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$44Average$64FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$84Average$236FlexibilityNo cancel feeOn-time63%

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