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$29+ 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 12/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAS
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Las Vegas Harry Reid Intl are usually found in October or February, booked 89 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 September 17, 2025.

Round-trip from

$58
(Cheapflightsfares)

One-way from

$29
(Southwest)

Popular in

June

Cheapest in

October

Average price

$108

Good round-trip deal

$99 or less

Good one-way deal

$70 or less
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. 9% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/37:30 pmONT - LAS
Nonstop1h 12mFrontier
Sat 10/48:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/16$58
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:00 amONT - LAS
Nonstop1h 11mFrontier
Tue 10/77:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/14$62
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
Sat 9/278:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 10/297:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/15$65
This Frontier deal was found by Cheapflights users on 9/15. 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 9/256:00 amONT - LAS
Nonstop1h 11mFrontier
Mon 10/67:45 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 9/15$66
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/96:05 amONT - LAS
Nonstop1h 11mFrontier
Sat 10/117:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/16$68
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/256:00 amONT - LAS
Nonstop1h 11mFrontier
Thu 9/2510:22 amLAS - ONT
Nonstop1h 16mFrontier
Deal found 9/14$72
This Frontier deal was found by Cheapflights users on 9/14. 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.
Mon 9/296:00 amONT - LAS
Nonstop1h 11mFrontier
Fri 10/36:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/14$73
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2610:28 pmONT - LAS
Nonstop1h 16mFrontier
Thu 10/27:15 amLAS - ONT
Nonstop1h 11mFrontier
Deal found 9/14$75
This Frontier deal was found by Cheapflights users on 9/15. 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 9/259:16 amONT - LAS
Nonstop1h 08mFrontier
Mon 9/296:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/15$77
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 9/248:00 amONT - LAS
Nonstop1h 11mFrontier
Fri 9/2610:27 amLAS - ONT
Nonstop1h 16mFrontier
Deal found 9/15$78
This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/278:00 amONT - LAS
Nonstop1h 11mFrontier
Mon 9/296:10 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/15$79

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 September 17, 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

Sat 10/11

8:45 pm-9:50 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Tue 10/14

7:20 am-8:25 am

Nonstop1h 05m

$77

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 10/26

9:05 pm-10:10 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Tue 10/28

7:20 am-8:25 am

Nonstop1h 05m

$77

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 12/4

8:55 pm-9:55 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Sat 12/6

5:55 am-11:10 am

1 stop5h 15m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 11/18

8:55 pm-9:55 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Thu 11/20

2:15 pm-3:20 pm

Nonstop1h 05m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 11/13

9:15 pm-10:15 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Sat 11/15

2:20 pm-3:25 pm

Nonstop1h 05m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 10/15

9:10 pm-10:15 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 10/22

8:20 pm-9:25 pm

Nonstop1h 05m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 11/10

9:15 pm-10:15 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Wed 11/12

8:35 am-9:35 am

Nonstop1h 00m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 11/7

9:15 pm-10:15 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Sat 11/8

8:40 am-9:40 am

Nonstop1h 00m

$87

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 12/2

8:55 pm-9:55 pm

Nonstop1h 00m

Las Vegas Harry Reid Intl

Thu 12/4

5:10 pm-6:15 pm

Nonstop1h 05m

$97

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 12/14

9:15 pm-10:15 pm

Nonstop1h 00m

$29

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 20 results
1
2

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

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 September 12, 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 89 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 September 17, 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 30% 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 September 14, 2025.

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

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

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 September 17, 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
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

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
8,023 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

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
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

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 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 3 daily flights to Las Vegas from 3 different airlines. 1h 00m 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 405 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 $22, 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 $46 and $97, respectively. Users have found that Spirit Airlines is 79% cheaper than the other options available to this destination.

  • 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 $132, our data indicates the cheapest price to be $30. The most popular route (Ontario - Las Vegas Harry Reid Intl), is priced around $52.

  • 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 Las Vegas?

Book flights to Las Vegas if you plan to visit one of these locations
Paradise
Henderson
North Las Vegas
Sunrise Manor
Winchester
Kingman
Primm
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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$22Average$87FlexibilityNo cancel feeOn-time65%
FrontierCheapest$46Average$102FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$97Average$236FlexibilityNo cancel feeOn-time63%

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