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Cheap Flights from Las Vegas (LASA) to Ontario (ONT)

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      Travellers and cabin class, 1 Adult, Economy
      Southwest Airlines
      Volaris
      Frontier Airlines

      Compare Las Vegas to Ontario International flight deals

      Find the cheapest month or even day of the year to fly to Ontario International

      Book the best Ontario International fare with no extra fees

      Flight deals from Las Vegas to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Las Vegas to Ontario International Airport? If you want to travel next month, return fares start from $120. Find the lowest prices on one-way and return tickets right here.
      Ontario.$120 per passenger.Departing Wed, 7 Oct, returning Wed, 14 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Wed, 7 Oct, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Wed, 14 Oct, arriving in Harry Reid International.Price includes taxes and charges.From $120, select.
      Ontario.$122 per passenger.Departing Sun, 6 Dec, returning Tue, 8 Dec.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Sun, 6 Dec, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Tue, 8 Dec, arriving in Harry Reid International.Price includes taxes and charges.From $122, select.
      Ontario.$124 per passenger.Departing Fri, 23 Oct, returning Sat, 7 Nov.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Fri, 23 Oct, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Sat, 7 Nov, arriving in Harry Reid International.Price includes taxes and charges.From $124, select.
      Ontario.$125 per passenger.Departing Fri, 6 Nov, returning Mon, 9 Nov.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Fri, 6 Nov, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Mon, 9 Nov, arriving in Harry Reid International.Price includes taxes and charges.From $125, select.
      Ontario.$125 per passenger.Departing Mon, 28 Sep, returning Wed, 30 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Mon, 28 Sep, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Wed, 30 Sep, arriving in Harry Reid International.Price includes taxes and charges.From $125, select.
      Ontario.$125 per passenger.Departing Mon, 28 Sep, returning Thu, 1 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Harry Reid International on Mon, 28 Sep, arriving in Ontario International.Inbound direct flight with Frontier Airlines departs from Ontario International on Thu, 1 Oct, arriving in Harry Reid International.Price includes taxes and charges.From $125, select.
      Ontario.$176 per passenger.Departing Mon, 23 Nov, returning Wed, 2 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Harry Reid International on Mon, 23 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 2 Dec, arriving in Harry Reid International.Price includes taxes and charges.From $176, select.
      Ontario.$301 per passenger.Departing Wed, 10 Feb, returning Sat, 13 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Wed, 10 Feb, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Sat, 13 Feb, arriving in Harry Reid International.Price includes taxes and charges.From $301, select.
      Ontario.$302 per passenger.Departing Thu, 7 Jan, returning Thu, 7 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Thu, 7 Jan, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Thu, 7 Jan, arriving in Harry Reid International.Price includes taxes and charges.From $302, select.
      Ontario.$302 per passenger.Departing Tue, 29 Dec, returning Thu, 7 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Tue, 29 Dec, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Thu, 7 Jan, arriving in Harry Reid International.Price includes taxes and charges.From $302, select.
      Ontario.$302 per passenger.Departing Mon, 23 Nov, returning Wed, 2 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Mon, 23 Nov, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 2 Dec, arriving in Harry Reid International.Price includes taxes and charges.From $302, select.
      Ontario.$315 per passenger.Departing Thu, 25 Feb, returning Mon, 1 Mar.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Thu, 25 Feb, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Mon, 1 Mar, arriving in Harry Reid International.Price includes taxes and charges.From $315, select.
      Ontario.$357 per passenger.Departing Sat, 30 Jan, returning Wed, 3 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harry Reid International on Sat, 30 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 3 Feb, arriving in Harry Reid International.Price includes taxes and charges.From $357, select.
      Ontario.$377 per passenger.Departing Mon, 1 Mar, returning Mon, 1 Mar.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Harry Reid International on Mon, 1 Mar, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Mon, 1 Mar, arriving in Harry Reid International.Price includes taxes and charges.From $377, select.
      Ontario.$380 per passenger.Departing Sat, 27 Feb, returning Mon, 12 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harry Reid International on Sat, 27 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 12 Apr, arriving in Harry Reid International.Price includes taxes and charges.From $380, select.
      Ontario.$432 per passenger.Departing Tue, 6 Apr, returning Wed, 7 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harry Reid International on Tue, 6 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 7 Apr, arriving in Harry Reid International.Price includes taxes and charges.From $432, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Las Vegas to Ontario International found in the last 4 days, and are subject to change and availability.

      Find the cheapest month to fly from Las Vegas to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Las Vegas to Ontario International flights are currently cheapest in October.
      Sep
      from $125
      Oct
      from $120
      Nov
      from $125
      Dec
      from $122
      Jan
      from $302
      Feb
      from $301
      Mar
      from $377
      Apr
      from $432
      May
      from $432
      Jun
      from $433
      Jul
      Find prices
      Aug
      Find prices

      Direct flights from Las Vegas to Ontario International

      Frontier Airlines
      Southwest Airlines
      Volaris

      Las Vegas to Ontario International: Alternative routes

      Compare routes from Las Vegas to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

      Ontario International

      4km from central Ontario
      Closest
      from $120
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from $65
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from $162
      Search flights

      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      from $60
      Search flights

      Los Angeles International

      71km from central Ontario
      Cheapest
      from $51
      Search flights

      Las Vegas to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found$120
      Cheapest month to flyOctober
      Average flight time1 hr, 6 mins
      Most popular airlineSouthwest Airlines
      Average flights per week54

      Finding cheap flights from Las Vegas to Ontario International: Frequently asked questions

      The best price we found for a return flight from Las Vegas to Ontario International is $120. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      1 hour and 6 minutes is the average flight time from Las Vegas to Ontario International.
      Southwest Airlines, Volaris and Frontier Airlines fly direct from Las Vegas to Ontario International.
      As of September 2026, there are 54 flights per week flying from Las Vegas to Ontario International.
      The cheapest month to fly from Las Vegas to Ontario International is usually October.
      After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Las Vegas to Ontario International Airport on Wednesday, 7 October 2026.
      Yes – the average flight time is 1 hour and 6 minutes.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

      The cheapest airline that flies to Ontario International is Frontier Airlines .

      Travelling from Las Vegas to Ontario International Airport (ONT): What you need to know

      • Las Vegas's main airport is Las Vegas Harry Reid International Airport (LAS). Explore your options for leaving from here when searching for your flights from Las Vegas to Ontario International Airport (ONT).

      • Expect to be travelling for 1 hour 5 minutes. That's the average journey time for a direct Las Vegas to Ontario International Airport flight.

      • Ontario International Airport is located in Ontario. The city's timezone is UTC-8 — the same as Las Vegas.

      • The most popular route is from Las Vegas Harry Reid International Airport (LAS) to Ontario International Airport (ONT), with 28 direct weekly services. If you'd rather get moving right away, the earliest flight from LAS to ONT is the 6am Southwest Airlines service. If a later flight fits your day better, the last departure is at 11pm with Southwest Airlines.

      • To ensure you catch your flight from Las Vegas to ONT, leave plenty of time to check in and find your gate. Turning up two hours ahead of international departures and one hour before domestic flights is the standard rule.

      • If you're going away during a popular month like March, head to the airport even earlier. You'll want to arrive up to four hours before an international flight and two hours ahead of a domestic departure. Security lines will be longer during high seasons like Christmas, New Year and spring break.

      Airports in Las Vegas

      Las Vegas Harry Reid International Airport (LAS)

      • Get to your destination in one go from Las Vegas Harry Reid International Airport (LAS). Direct flights from Las Vegas to Ontario International Airport (ONT) operate from here.

      • Southwest Airlines is a leading airline that offers direct flights from Las Vegas to Ontario International Airport departing from LAS.

      • Most passengers prefer to book seats with Southwest Airlines between LAS and ONT.

      • Frontier Airlines is the top-ranked carrier for punctuality on this route.

      • The journey from central Las Vegas to LAS takes around 25 minutes on public transport. If you ride-share, drive or grab a taxi, you'll cover the 8 kilometres in 10 minutes or so, depending on traffic.

      • Want an easy start to your trip? Stay near Las Vegas Harry Reid International Airport. Whether you have an early flight from Las Vegas to Ontario International Airport or aren't a fan of being rushed, these hotels are just the thing:

      • Of the flights that depart from Las Vegas Harry Reid International Airport, 79% arrive on time at their destination.

      • You'll find LAS at 5757 Wayne Newton Boulevard.

      About Ontario International Airport (ONT)

      • If you're coming in on a late flight from Las Vegas to Ontario International Airport, few things top the convenience of staying near the terminal. Grab your bags from the carousel and then be showered and sleeping not long after at one of these options near ONT:

      • Booking your ride around three weeks ahead of your Las Vegas to Ontario International Airport flight can help you score a better rate.

      • You'll find ONT at 2900 E. Airport Drive.

      Getting from Ontario International Airport (ONT) to central Ontario

      • Central Ontario is around 10 kilometres from Ontario International Airport and takes about 15 minutes to reach by car. See what your options are for getting into town, whether that's with a car hire, taxi or ride-share.

      • It takes around 45 minutes if you're travelling on public transport.

      How to find the cheapest flights from Las Vegas to Ontario International Airport (ONT)

      • Currently, $58 is the lowest price we've found for a one-way ticket from Las Vegas to Ontario International Airport. The cheapest price for a return flight is $120. Keep in mind fares can change due to demand at the time of booking.

      • Book 11 months before travelling. Pricing trends suggest that this is the ideal window for finding cheap flights from Las Vegas to ONT.

      • April is when you're most likely to land a fantastic deal on a Las Vegas to Ontario International Airport ticket. If you need to travel at a different time of year, the 'Whole month' tool will show you the lowest prices for each month.

      • Save time searching for cheap plane tickets from Las Vegas to ONT by creating a Price Alert. We'll send you an email or notification on the app when a new discounted fare appears.

      • Find a cheap flight from Las Vegas to Ontario International Airport by using the search filters. Select your preferred times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

      The best time to fly from Las Vegas to Ontario International Airport (ONT)

      • It's time to decide your travel dates for your flight from Las Vegas to Ontario International Airport (ONT). July is the peak month for travel to Ontario. If a slower pace sounds more appealing, head there in December.

      • When booking your Las Vegas to ONT plane ticket, consider the weather you're most comfortable in. August is the warmest month in Ontario, with temperatures ranging from 16ºC (61ºF) to 36ºC (97ºF).

      • If you like cooler conditions, search for a cheap ticket from Las Vegas to Ontario International Airport in February when temperatures are between 4ºC (39ºF) and 24ºC (75ºF).

      More about Ontario

      Explore more of the United States

      • You've seen Ontario, now it's time to discover other corners of the United States. Journey around 153 kilometres south to San Diego to check off its top sights. From San Diego Zoo to San Diego Balboa Park and USS Midway Museum, there's plenty to keep you on the go.

      • If you're ready to explore another great destination in the United States, consider Bakersfield, about 193 kilometres northwest of Ontario. Kern County Museum, Rabobank Arena, Theatre & Convention Centre and Bakersfield Museum of Art are key highlights.

      Plan smart, explore more

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      Plan the rest of your trip from Las Vegas to Ontario

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.