How popular is this Ontario to Las Vegas flight route?

The Ontario to Las Vegas Harry Reid Intl flight path was viewed by 363 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

Currently priced at $64, Frontier will fly you from Ontario to Las Vegas and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Southwest for as low as $107. Users have found that Frontier is 38% cheaper than the other options available to this destination.

In terms of precipitation, rainfall in Las Vegas ranges from 0.1 - 0.8 inches per month. February is typically the wettest month, when rainfall can reach 0.8 in. May is typically the driest time to visit Las Vegas when rainfall is around 0.1 in.

If weather is an important factor for your trip to Las Vegas, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 93.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 $116, our data indicates the cheapest price to be $31. The most popular route (Ontario - Las Vegas Harry Reid Intl), is priced around $34.

What are the most popular airlines that fly from Ontario to Las Vegas?

Consider Frontier, Spirit Airlines or Southwest when booking your flight. These represent the most popular airlines when flying from Ontario to Las Vegas.

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

It’s generally more expensive to depart on a Saturday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Users have found that booking a flight from Ontario to Las Vegas at least 19 days early can save you up to 100% on average compared to booking a flight this week. If booking 19 days before your flight isn’t an option for you, users have found flights from Ontario to Las Vegas for as little as $73 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $151 for flights departing within the next 3 days.

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

Our data shows that September tends to be the cheapest month to fly to Las Vegas from Ontario. Users have commonly found prices around $107 for the month, but tickets can be as low as $35. Due to multiple factors, prepare for potentially higher prices in March.

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 5 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.

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.

$30+ Flights from Ontario to Las Vegas

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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 October or September, booked 89 days in advance, depart on a Sunday or Monday and return on a Tuesday

Cheap flight deals from Ontario to Las Vegas

Round-trip from	$64 (Cheapflightsfares)
One-way from	$30 (CheapOair)
Popular in	June
Cheapest in	October
Average price	$104
Good round-trip deal	$88 or less
Good one-way deal	$72 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. 12% potential increase in price ($15 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 July 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 July 28, 2025.

Sat 8/95:13 pmONT - LAS

Nonstop1h 14mFrontier

Mon 8/1110:43 amLAS - ONT

Nonstop1h 10mFrontier

Deal found 7/28

$64

Best flights from Ontario to Las Vegas
Discover carefully curated flight deals from Ontario to Las Vegas that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2025.

Thu 8/146:00 amONT - LAS

Nonstop1h 13mFrontier

Thu 8/2110:21 amLAS - ONT

Nonstop1h 10mFrontier

Deal found 7/28

$64

Sat 8/238:50 pmONT - LAS

Nonstop1h 05mSouthwest

Wed 8/279:50 amLAS - ONT

1 stop4h 30mSouthwest

Deal found 7/28

$107

Last-minute flights from Ontario to Las Vegas
Discover last-minute flight deals from Ontario to Las Vegas. Data last updated July 28, 2025 and is based on user searches.

Sat 8/25:13 pmONT - LAS

Nonstop1h 14mFrontier

Mon 8/410:43 amLAS - ONT

Nonstop1h 10mFrontier

Deal found 7/28

$66

Thu 8/146:00 amONT - LAS

Nonstop1h 13mFrontier

Thu 8/2110:21 amLAS - ONT

Nonstop1h 10mFrontier

Deal found 7/28

$64

Sat 8/238:50 pmONT - LAS

Nonstop1h 05mSouthwest

Wed 8/279:50 amLAS - ONT

1 stop4h 30mSouthwest

Deal found 7/28

$107

One-way flights from Ontario to Las Vegas
Search for one-way flight options from Ontario to Las Vegas. Find affordable one-way fares based on user searches. Data last updated July 28, 2025.

Sat 10/251:37 pmONT - LAS

Nonstop1h 18mFrontier

Deal found 7/26

$30

Mon 8/258:35 amONT - LAS

Nonstop1h 05mSouthwest

Deal found 7/26

$39

Fly from

Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 8/9

5:13 pm-6:27 pm

Nonstop1h 14m

Las Vegas Harry Reid Intl

Mon 8/11

10:43 am-11:53 am

Nonstop1h 10m

$64

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 11/1

8:00 am-9:12 am

Nonstop1h 12m

$30

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 8/25

8:35 am-9:40 am

Nonstop1h 05m

$39

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

The best insider tips for Ontario to Las Vegas flights

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

Airlines

Frontier

Frontier offers low fares, but remember to factor in extra charges for a true cost comparison.

Consider extra comfort seats for more legroom on this short flight.

Read more about Frontierby Marisa Garcia

Southwest

Enjoy free snacks and non-alcoholic drinks on board, enhancing your short flight experience.

Two free checked bags included, ideal for travelers with extra luggage needs.

Read more about Southwestby Marisa Garcia

Airports

ONT

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

LAS

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

Our travel experts

Marisa Garcia

Expert on Frontier and Southwest

Bill Fink

Expert on ONT

Ramsey Qubein

Expert on LAS

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?

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?

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 25% on your trip compared to booking a flight in the afternoon.

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

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.

Weekly flight availability from Ontario to Las Vegas

The most flights from ONT to LAS are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing Las Vegas

Peruse reviews from past customers who have flown with Southwest 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

4,237 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest

8.0

Very good

4,237 reviews

Southwest

8.0

Very good

4,237 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Frontier

5.9

Fair

3,238 reviews

Southwest

8.0

Very good

4,237 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Related info for your journey

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 5 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 363 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines flying from Ontario to Las Vegas round-trip?
Currently priced at $64, Frontier will fly you from Ontario to Las Vegas and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Southwest for as low as $107. Users have found that Frontier is 38% 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 $116, our data indicates the cheapest price to be $31. The most popular route (Ontario - Las Vegas Harry Reid Intl), is priced around $34.
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

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Complete your trip

Las Vegas car rentals

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Other flights to Las Vegas

Top 3 airlines flying from Ontario to Las Vegas

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$22	Average$78	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$44	Average$98	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$97	Average$238	FlexibilityNo cancel fee	On-time63%

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$30+ 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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Las Vegas with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Ontario to Las Vegas Harry Reid Intl are usually found in October or September, booked 89 days in advance, depart on a Sunday or Monday and return on a Tuesday

Cheap flight deals from Ontario to Las Vegas

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Ontario to Las Vegas

Cheapest flights from Ontario to Las VegasExplore 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 July 28, 2025.

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 July 28, 2025.

Cheapflights Fare Finder

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

The best insider tips for Ontario to Las Vegas flights

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

Airlines

Frontier

Southwest

Airports

ONT

LAS

Our travel experts

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.

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 July 25, 2025.

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

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 July 28, 2025.

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 July 27, 2025.

Weekly flight availability from Ontario to Las Vegas

Explore weekly flight availability from Ontario to Las Vegas. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 28, 2025.

Reviews of airlines servicing Las Vegas

Peruse reviews from past customers who have flown with Southwest 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.

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?

How popular is this Ontario to Las Vegas flight route?

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

What are the cheapest flights from Ontario to Las Vegas?

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

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

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

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

Traveling to a place near Las Vegas?

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Alternative routes for Ontario to Las Vegas

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Top 3 airlines flying from Ontario to Las Vegas

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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 July 28, 2025.