How popular is this Las Vegas to Ontario flight route?

Within the past month, 65 users have taken a look at flights from Las Vegas Harry Reid Intl to Ontario.

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 $58. Another airline that can offer you cheap pricing is Southwest. You may be able to fly from Las Vegas to Ontario for 28% 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 Frontier ($39), Southwest ($49), and American Airlines ($94).

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What are the cheapest flights from Las Vegas to Ontario?

On average you can expect to pay $138 for a flight from Las Vegas to Ontario. The cheapest flight overall is $59 while the most popular route, (Las Vegas Harry Reid Intl - Ontario) is currently priced at $81.

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

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

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

Saturday flights are found to be more expensive to fly from Las Vegas to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

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

To save on the cost of your flight from Las Vegas to Ontario, book at least 22 days before your planned departure. Booking around this time can save you about 60% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $48 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $103.

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

The best pricing can be found in the month of May. Prices to Ontario from Las Vegas average $78. You can even find prices in May for less than $78, as users have found deals to Ontario from as low as $41. The month of March appears to be one of the more expensive times to travel to Ontario from Las Vegas. Flying in the targeted month can save you up to 31%.

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 3 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 05m is how long a nonstop flight from Las Vegas to Ontario typically takes.

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.

$39+ Flights from Las Vegas to Ontario

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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

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Cheapflights Tip: The best prices from Las Vegas Harry Reid Intl to Ontario are usually found in September or August, booked 46 days in advance, depart on a Tuesday or Thursday and return on a Sunday

Cheap flight deals from Las Vegas to Ontario

Round-trip from	$58 (Frontier)
One-way from	$39 (Frontier)
Popular in	April
Cheapest in	September
Average price	$88
Good round-trip deal	$115 or less
Good one-way deal	$87 or less

From Las Vegas Harry Reid Intl to Ontario

Search Deals

One-way flight from Las Vegas Harry Reid Intl to Ontario

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Highest demand for flights based on searches. 21% potential increase in price ($22 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($4 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 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 July 3, 2025.

Wed 7/305:18 pmLAS - ONT

Nonstop1h 09mFrontier

Sat 8/97:00 amONT - LAS

Nonstop1h 11mFrontier

Deal found 7/3

$58

Tue 8/1912:05 pmLAS - ONT

Nonstop1h 15mSouthwest

Tue 8/266:05 amONT - LAS

1 stop5h 05mSouthwest

Deal found 7/2

$107

Best flights from Las Vegas to Ontario
Discover carefully curated flight deals from Las Vegas to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Wed 7/305:18 pmLAS - ONT

Nonstop1h 09mFrontier

Wed 8/67:22 pmONT - LAS

Nonstop1h 13mFrontier

Deal found 7/3

$58

Tue 8/1912:05 pmLAS - ONT

Nonstop1h 15mSouthwest

Tue 8/266:05 amONT - LAS

1 stop5h 05mSouthwest

Deal found 7/2

$107

Last-minute flights from Las Vegas to Ontario
Discover last-minute flight deals from Las Vegas to Ontario. Data last updated July 3, 2025 and is based on user searches.

Tue 7/158:45 pmLAS - ONT

Nonstop1h 07mFrontier

Wed 7/167:22 pmONT - LAS

Nonstop1h 13mFrontier

Deal found 7/1

$58

Wed 7/305:18 pmLAS - ONT

Nonstop1h 09mFrontier

Sat 8/97:00 amONT - LAS

Nonstop1h 11mFrontier

Deal found 7/3

$58

Tue 8/1912:05 pmLAS - ONT

Nonstop1h 15mSouthwest

Tue 8/266:05 amONT - LAS

1 stop5h 05mSouthwest

Deal found 7/2

$107

One-way flights from Las Vegas to Ontario
Search for one-way flight options from Las Vegas to Ontario. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Thu 7/177:45 pmLAS - ONT

Nonstop1h 07mFrontier

Deal found 7/2

$39

Mon 9/299:00 pmLAS - ONT

Nonstop1h 00mSouthwest

Deal found 7/1

$49

Sat 8/24:30 pmLAS - ONT

1 stop5h 08mAmerican Airlines

Deal found 7/2

$94

Cheapflights Fare Finder

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

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 7/30

5:18 pm-6:27 pm

Nonstop1h 09m

Ontario

Sat 8/9

7:00 am-8:11 am

Nonstop1h 11m

$58

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 8/19

12:05 pm-1:20 pm

Nonstop1h 15m

Ontario

Tue 8/26

6:05 am-11:10 am

1 stop5h 05m

$107

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Thu 7/17

7:45 pm-8:52 pm

Nonstop1h 07m

$39

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Mon 9/29

9:00 pm-10:00 pm

Nonstop1h 00m

$49

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Sat 8/2

4:30 pm-9:38 pm

1 stop5h 08m

$94

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

The best insider tips for Las Vegas to Ontario flights

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.

ONT

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

Our travel experts

Bill Fink

Expert on ONT

Ramsey Qubein

Expert on LAS

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?

To ensure you get the cheapest price possible for a flight from Las Vegas to Ontario, you should look to book at least 46 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?

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 33% versus a flight in the evening.

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

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

Read through reviews of airlines operating flights from Las Vegas to Ontario, such as Southwest, American 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

4,266 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Southwest

8.0

Very good

4,266 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Frontier

5.9

Fair

3,286 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

10.0

Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

Related info for your journey

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 3 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 05m 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, 65 users have taken a look at flights from Las Vegas Harry Reid Intl to Ontario.
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 $58. Another airline that can offer you cheap pricing is Southwest. You may be able to fly from Las Vegas to Ontario for 28% 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 Frontier ($39), Southwest ($49), and American Airlines ($94).
What are the cheapest flights from Las Vegas to Ontario?
On average you can expect to pay $138 for a flight from Las Vegas to Ontario. The cheapest flight overall is $59 while the most popular route, (Las Vegas Harry Reid Intl - Ontario) is currently priced at $81.
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.

See more FAQs

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Other flights to Ontario

Top 3 airlines flying from Las Vegas to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$23	Average$48	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$38	Average$78	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$97	Average$233	FlexibilityNo cancel fee	On-time63%

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$39+ 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Las Vegas to Ontario 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 Las Vegas Harry Reid Intl to Ontario are usually found in September or August, booked 46 days in advance, depart on a Tuesday or Thursday and return on a Sunday

Cheap flight deals from Las Vegas to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Las Vegas to Ontario

Cheapest flights from Las Vegas to OntarioExplore 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 July 3, 2025.

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 July 3, 2025.

Cheapflights Fare Finder

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

The best insider tips for Las Vegas to Ontario flights

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

Airports

LAS

ONT

Our travel experts

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.

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 June 27, 2025.

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

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 July 3, 2025.

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 June 29, 2025.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from Las Vegas to Ontario, such as Southwest, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

How popular is this Las Vegas to Ontario flight route?

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

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

What are the cheapest flights from Las Vegas to Ontario?

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

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

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

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

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.

Alternative routes for Las Vegas to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Las Vegas to Ontario

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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 July 3, 2025.