$29 Cheap Flights from Ontario (ONT) to Las Vegas (LAS)

View $29 flight on Tue, May 27, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)

Find available prices by choosing your travel dates.

Cheap Flights from Ontario to Las Vegas (ONT-LAS)

Prices were available within the past 7 days and start at $29 for one-way flights and $58 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, May 10 - Wed, May 14
ONT
Ontario
LAS
Las Vegas
$58 Roundtrip, just found
$58
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 10 from Ontario to Las Vegas, returning Wed, May 14, priced at $58 just found
Frontier Airlines
Wed, Jun 11 - Sat, Jun 14
ONT
Ontario
LAS
Las Vegas
$62 Roundtrip, found 8 hours ago
$62
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Wed, Jun 11 from Ontario to Las Vegas, returning Sat, Jun 14, priced at $62 found 8 hours ago
Frontier Airlines
Mon, Jun 9 - Wed, Jun 11
ONT
Ontario
LAS
Las Vegas
$63 Roundtrip, just found
$63
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Jun 9 from Ontario to Las Vegas, returning Wed, Jun 11, priced at $63 just found
Frontier Airlines
Sun, May 25 - Tue, May 27
ONT
Ontario
LAS
Las Vegas
$65 Roundtrip, just found
$65
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, May 25 from Ontario to Las Vegas, returning Tue, May 27, priced at $65 just found
Southwest Airlines
Mon, Jun 9 - Wed, Jun 11
ONT
Ontario
LAS
Las Vegas
$68 Roundtrip, just found
$68
Roundtrip
just found
Select Southwest Airlines flight, departing Mon, Jun 9 from Ontario to Las Vegas, returning Wed, Jun 11, priced at $68 just found
Frontier Airlines
Sat, Jun 21 - Wed, Jun 25
ONT
Ontario
LAS
Las Vegas
$68 Roundtrip, just found
$68
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Jun 21 from Ontario to Las Vegas, returning Wed, Jun 25, priced at $68 just found
Frontier Airlines
Wed, May 21 - Sat, May 24
ONT
Ontario
LAS
Las Vegas
$69 Roundtrip, just found
$69
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, May 21 from Ontario to Las Vegas, returning Sat, May 24, priced at $69 just found
United
Sat, May 24 - Sun, May 25
ONT
Ontario
LAS
Las Vegas
$177 Roundtrip, just found
$177
Roundtrip
just found
Select United flight, departing Sat, May 24 from Ontario to Las Vegas, returning Sun, May 25, priced at $177 just found
American Airlines
Tue, May 20 - Thu, May 22
ONT
Ontario
LAS
Las Vegas
$199 Roundtrip, just found
$199
Roundtrip
just found
Select American Airlines flight, departing Tue, May 20 from Ontario to Las Vegas, returning Thu, May 22, priced at $199 just found
Alaska Airlines
Mon, May 12 - Wed, May 21
ONT
Ontario
LAS
Las Vegas
$321 Roundtrip, found 2 hours ago
$321
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Mon, May 12 from Ontario to Las Vegas, returning Wed, May 21, priced at $321 found 2 hours ago

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) cost?
Cheap return fares from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) start from $54. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines and Spirit Airlines flight leaving ONT on May 20 2025 and touching down at LAS. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from ONT to LAS?
The cheapest flights from ONT to LAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
You can fly directly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) on a Southwest Airlines flight.
What is the cheapest airline that flies from ONT to LAS?
Currently, the cheapest carrier operating one-way flights from ONT to LAS is Frontier Airlines. You can book a seat on this route from $34. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ONT on June 15 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
When jetting out of Los Angeles - Ontario Intl. Airport (ONT), you can choose from an average of 7 daily nonstop flights to Harry Reid Intl. Airport (LAS).
What are the most popular departure times for flights from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
The 6 AM departures from ONT to LAS see the highest demand. Greater demand means you’ll likely pay more for these departures. If you want to save money, book during off-peak hours.
What day of the week has the most flights from ONT to LAS?
Friday has the most flights from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS). Consider jetting off on this day and you’ll have the best chance of finding a schedule that works for you.
What is the earliest flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
The first flight of the day taking off from Los Angeles - Ontario Intl. Airport (ONT) is at around 6:05AM UTC-8. Hop on this flight and you’ll touch down at Harry Reid Intl. Airport (LAS) at approximately 7:10AM UTC-8. The total flight duration is 1h 5m.
How long does it take to fly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
Typically, it takes 1 hour and 7 minutes to fly the 200 mi from ONT to LAS.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
To avoid possible delays on the Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) route, aim to fly before 3 PM. Later departures have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Las Vegas from Los Angeles - Ontario Intl. Airport (ONT)?
Harry Reid Intl. Airport (LAS) is the only airport in Las Vegas with direct flights from Los Angeles - Ontario Intl. Airport (ONT). Compare your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS) last-minute?
Last-minute fares from ONT to LAS are generally more expensive. For the best prices, start searching for flights as early as possible. That said, if you can play around with your travel dates, it’s possible to land a cheap ticket just before your departure.
Is it cheaper to book an ONT to LAS flight and hotel package?
Compared with arranging flights and hotels separately, booking an ONT to LAS flight and hotel package with Expedia could result in significant savings. What’s more, managing everything in one place takes the hassle out of planning your trip. Simply pick your flights and select from our extensive range of stays, then customize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Harry Reid Intl. Airport (LAS)?
You can usually cancel or reschedule your ONT to LAS flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find more details on our Customer Service portal.
*Available to One Key members.