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$30+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
LAS — ONT
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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Cheapflights Tip: The best prices from Las Vegas Harry Reid Intl to Ontario are usually found in September or October, booked 38 days in advance, depart on a Thursday or Tuesday and return on a Sunday

Cheap 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 August 20, 2025.

Round-trip from

$74
(Frontier)

One-way from

$30
(Frontier)

Popular in

April

Cheapest in

September

Average price

$83

Good round-trip deal

$89 or less

Good one-way deal

$55 or less
From Las Vegas Harry Reid Intl to Ontario
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One-way flight from Las Vegas Harry Reid Intl to Ontario
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Highest demand for flights based on searches. 17% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Las Vegas Harry Reid Intl to Ontario.
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Price to beat on a one-way flight from Las Vegas Harry Reid Intl to Ontario.
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Find 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 August 20, 2025.

This Frontier deal was found by Cheapflights users on 8/18. 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 9/410:22 amLAS - ONT
Nonstop1h 16mFrontier
Sun 9/77:30 pmONT - LAS
Nonstop1h 12mFrontier
Deal found 8/18$74
This Cheapflightsfares deal was found by Cheapflights users on 8/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:45 pmLAS - ONT
Nonstop1h 07mFrontier
Sun 8/2410:13 pmONT - LAS
Nonstop1h 14mFrontier
Deal found 8/18$76
This Cheapflightsfares deal was found by Cheapflights users on 8/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2110:21 amLAS - ONT
Nonstop1h 10mFrontier
Mon 8/257:19 pmONT - LAS
Nonstop1h 13mFrontier
Deal found 8/18$77
This CheapOair deal was found by Cheapflights users on 8/20. 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 9/1810:22 amLAS - ONT
Nonstop1h 16mFrontier
Thu 9/256:00 amONT - LAS
Nonstop1h 11mFrontier
Deal found 8/20$78
This Frontier deal was found by Cheapflights users on 8/19. 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 9/98:49 pmLAS - ONT
Nonstop1h 07mFrontier
Wed 9/108:00 amONT - LAS
Nonstop1h 11mFrontier
Deal found 8/19$80
This Cheapflightsfares deal was found by Cheapflights users on 8/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/217:45 pmLAS - ONT
Nonstop1h 07mFrontier
Sun 8/246:00 amONT - LAS
Nonstop1h 13mFrontier
Deal found 8/18$81
This Cheapflightsfares deal was found by Cheapflights users on 8/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/117:15 amLAS - ONT
Nonstop1h 11mFrontier
Sun 9/147:30 pmONT - LAS
Nonstop1h 12mFrontier
Deal found 8/20$83
This FlightHub deal was found by Cheapflights users on 8/18. 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.
Sat 8/3010:57 amLAS - ONT
Nonstop1h 10mFrontier
Sat 9/61:37 pmONT - LAS
Nonstop1h 17mFrontier
Deal found 8/18$84
This Cheapflightsfares deal was found by Cheapflights users on 8/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:10 amLAS - ONT
Nonstop1h 07mFrontier
Fri 9/1910:28 pmONT - LAS
Nonstop1h 16mFrontier
Deal found 8/18$85
This Cheapflightsfares deal was found by Cheapflights users on 8/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/273:07 pmLAS - ONT
Nonstop1h 11mFrontier
Sat 8/301:07 pmONT - LAS
Nonstop1h 15mFrontier
Deal found 8/20$86
This Cheapflightsfares deal was found by Cheapflights users on 8/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:49 pmLAS - ONT
Nonstop1h 07mFrontier
Wed 10/88:00 amONT - LAS
Nonstop1h 12mFrontier
Deal found 8/20$88

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 August 20, 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

Thu 9/4

7:15 am-8:26 am

Nonstop1h 11m

Ontario

Sun 9/7

6:00 am-7:11 am

Nonstop1h 11m

$74

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 9/11

7:15 am-8:26 am

Nonstop1h 11m

Ontario

Thu 9/11

7:30 pm-8:42 pm

Nonstop1h 12m

$76

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 9/5

8:48 pm-9:55 pm

Nonstop1h 07m

Ontario

Sun 9/7

10:28 pm-11:44 pm

Nonstop1h 16m

$76

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Mon 9/15

6:10 am-7:17 am

Nonstop1h 07m

Ontario

Mon 9/15

10:28 pm-11:44 pm

Nonstop1h 16m

$76

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Fri 8/29

6:30 am-7:33 am

Nonstop1h 03m

Ontario

Sat 8/30

1:07 pm-2:22 pm

Nonstop1h 15m

$76

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 10/16

8:00 am-9:10 am

Nonstop1h 10m

Ontario

Sat 10/18

1:37 pm-2:55 pm

Nonstop1h 18m

$77

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 9/11

7:15 am-8:26 am

Nonstop1h 11m

Ontario

Fri 9/12

10:28 pm-11:44 pm

Nonstop1h 16m

$77

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 9/13

11:27 am-12:43 pm

Nonstop1h 16m

Ontario

Tue 9/16

8:00 am-9:11 am

Nonstop1h 11m

$77

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Mon 9/15

7:45 pm-8:56 pm

Nonstop1h 11m

$30

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sun 9/7

6:10 am-7:17 am

Nonstop1h 07m

$31

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 16 results
1
2

The best insider tips for Las Vegas to Ontario 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 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

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 August 8, 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, August is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $246). Flying from Las Vegas to Ontario in March is currently the most expensive (average of $328). 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 August 20, 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 23% versus a flight in the evening.

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 August 17, 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 afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 August 20, 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
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
8,039 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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
3,207 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

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 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 3 different airlines, which means you should have some options if you want to compare airfare deals. 1h 04m 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, 67 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 11m. 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 $26. Other airlines that can offer you cheap pricing are Frontier, from $39, and Southwest, from $97. You may be able to fly from Las Vegas to Ontario for 69% less than the average price by searching for these airlines.

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

    On average you can expect to pay $129 for a flight from Las Vegas to Ontario. The cheapest flight overall is $29 while the most popular route, (Las Vegas Harry Reid Intl - Ontario) is currently priced at $52.

  • 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, August is the cheapest month in which you can book a flight from Las Vegas to Ontario (average of $246). Flying from Las Vegas to Ontario in March is currently the most expensive (average of $328). 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.

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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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$26Average$48FlexibilityNo cancel feeOn-time65%
FrontierCheapest$39Average$86FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$230FlexibilityNo cancel feeOn-time63%

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