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716 € Cheap Flights from Ontario International to Buenos Aires

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      Travellers and cabin class, 1 Adult, Economy

      Compare Ontario International to Buenos Aires flight deals

      Find the cheapest month or even day of the year to fly to Buenos Aires

      Book the best Buenos Aires fare with no extra fees

      Flight deals from Ontario International to Buenos Aires

      Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Buenos Aires? If you want to travel next month, return fares start from 716 €. Find the lowest prices on one-way and return tickets right here.
      Buenos Aires.716 € per passenger.Departing Thu, 22 Oct, returning Thu, 29 Oct.Return flight with Avianca.Outbound indirect flight with Avianca, departs from Ontario International on Thu, 22 Oct, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with Avianca, departs from Buenos Aires Jorge Newbery on Thu, 29 Oct, arriving in Ontario International.Price includes taxes and charges.From 716 €, select.
      Buenos Aires.872 € per passenger.Departing Sun, 25 Oct, returning Sun, 1 Nov.Return flight with Frontier Airlines and Aerolíneas Argentinas.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sun, 25 Oct, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with Aerolíneas Argentinas, departs from Buenos Aires Ministro Pistarini on Sun, 1 Nov, arriving in Ontario International.Price includes taxes and charges.From 872 €, select.
      Buenos Aires.905 € per passenger.Departing Mon, 19 Apr, returning Fri, 30 Apr.Return flight with Volaris and Arajet.Outbound indirect flight with Volaris, departs from Ontario International on Mon, 19 Apr, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with Arajet, departs from Buenos Aires Ministro Pistarini on Fri, 30 Apr, arriving in Ontario International.Price includes taxes and charges.From 905 €, select.
      Buenos Aires.941 € per passenger.Departing Fri, 19 Feb, returning Fri, 26 Feb.Return flight with Volaris and JetSmart.Outbound indirect flight with Volaris, departs from Ontario International on Fri, 19 Feb, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with JetSmart, departs from Buenos Aires Ministro Pistarini on Fri, 26 Feb, arriving in Ontario International.Price includes taxes and charges.From 941 €, select.
      Buenos Aires.961 € per passenger.Departing Mon, 17 May, returning Mon, 24 May.Return flight with Volaris and Aeromexico.Outbound indirect flight with Volaris, departs from Ontario International on Mon, 17 May, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with Aeromexico, departs from Buenos Aires Ministro Pistarini on Mon, 24 May, arriving in Ontario International.Price includes taxes and charges.From 961 €, select.
      Buenos Aires.1.018 € per passenger.Departing Sat, 5 Dec, returning Tue, 15 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Sat, 5 Dec, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with Delta, departs from Buenos Aires Ministro Pistarini on Tue, 15 Dec, arriving in Ontario International.Price includes taxes and charges.From 1.018 €, select.
      Buenos Aires.1.169 € per passenger.Departing Sat, 9 Jan, returning Sat, 16 Jan.Return flight with Alaska Airlines and JetSmart.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Sat, 9 Jan, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with JetSmart, departs from Buenos Aires Ministro Pistarini on Sat, 16 Jan, arriving in Ontario International.Price includes taxes and charges.From 1.169 €, select.
      Buenos Aires.1.171 € per passenger.Departing Wed, 23 Dec, returning Tue, 12 Jan.Return flight with Frontier Airlines and JetSmart.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 23 Dec, arriving in Buenos Aires Ministro Pistarini.Inbound indirect flight with JetSmart, departs from Buenos Aires Jorge Newbery on Tue, 12 Jan, arriving in Ontario International.Price includes taxes and charges.From 1.171 €, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Ontario International to Buenos Aires found in the last 4 days, and are subject to change and availability.

      Find the cheapest month to fly from Ontario International to Buenos Aires

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Buenos Aires flights are currently cheapest in October.
      Sep
      Find prices
      Oct
      from 716 €
      Nov
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      Dec
      from 1.018 €
      Jan
      from 1.169 €
      Feb
      from 941 €
      Mar
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      Apr
      from 905 €
      May
      from 961 €
      Jun
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      Jul
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      Aug
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      Alternative Ontario International to Buenos Aires routes

      Looking for the cheapest, fastest or easiest route from Ontario International to Buenos Aires? You could fly into the following airports instead.

      Buenos Aires Jorge Newbery

      7km from central Buenos Aires
      Closest
      from 954 €
      Search flights

      Buenos Aires Ministro Pistarini

      28km from central Buenos Aires
      Cheapest
      from 716 €
      Search flights

      Ontario to Buenos Aires: Flight information

      The things to know before you go.
      Cheapest flight found716 €
      Cheapest month to flyOctober

      Finding cheap flights from Ontario International to Buenos Aires: Frequently asked questions

      There are 2 airports in Buenos Aires: Buenos Aires Jorge Newbery and Buenos Aires Ministro Pistarini.
      The best price we found for a return flight from Ontario International to Buenos Aires is 716 €. 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.
      Currently, there are no airlines that fly direct from Ontario International to Buenos Aires. But we found flights with one or more stops from 716 €.
      As of September 2026, there are no flights flying from Ontario International to Buenos Aires.
      The cheapest month to fly from Ontario International to Buenos Aires is usually October.
      If you're flying from Ontario International Airport, the cheapest airport near Buenos Aires is Buenos Aires Ministro Pistarini – which is 27.7 km away from the centre of Buenos Aires. We've found flights into this airport from 716 €.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Buenos Aires on Thursday, 22 October 2026.
      No airlines currently offer direct flights between Ontario International Airport and Buenos Aires. Most routes have one or more stops.
      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 Buenos Aires 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 Buenos Aires is around 40 days in advance, so don’t leave your flight to the last minute.

      In September, the average temperature is usually around 15°C. January is typically the warmest month in Buenos Aires, when it usually averages around 30°C. You can expect the least rain in June. The coldest month is July, with temperatures averaging 7°C. The rainiest month is March.
      Currently, Avianca offers the cheapest flight tickets to Buenos Aires.

      Travelling from Ontario International Airport (ONT) to Buenos Aires: what you need to know

      • Ontario International Airport is located in Ontario. Following the UTC-3 timezone, Buenos Aires is five hours ahead of Ontario.

      • For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. That way, you won't have to rush to board your ONT to Buenos Aires flight.

      • During popular months like July, it's wise to get to the airport earlier than usual. Plan to arrive two hours before a domestic departure and four hours ahead of international flights when you travel during high season in general.

      • A stopover is the perfect opportunity to break up your trip and perhaps even tick off a new city. When searching for plane tickets from ONT to Buenos Aires, uncheck the 'Direct flights only' box to see where you can stop along the way. Consider one of these popular options:

        • Atlanta Hartsfield-Jackson International Airport (ATL)

        • Dallas Fort Worth International Airport (DFW)

        • Houston George Bush Intercontinental Airport (IAH)

      • The journey from central Ontario to ONT takes about 45 minutes on public transport. If you drive, ride-share or take a taxi, you'll cover the 5 kilometres in 15 minutes or so, depending on traffic.

      • Looking for a hotel close to ONT? If you're boarding an early flight from Ontario International Airport to Buenos Aires, these stays will put you moments from check-in:

      • Ontario International Airport scores high marks for on-time performance. 83% of flights that depart ONT arrive at their destination as scheduled.

      • The address for ONT is 2900 E. Airport Drive.

      How to find the cheapest flights from Ontario International Airport (ONT) to Buenos Aires

      • 387 € is currently the best price for a one-way Ontario International Airport to Buenos Aires flight. Return plane tickets start from 716 €. These prices can change depending on availability and demand.

      • Don't leave things to the last minute. You're more likely to find cheap flights from ONT to Buenos Aires if you book in advance. Airlines often offer some fantastic early bird deals.

      • If you have flexibility with your travel plans, try using the 'Whole month' search tool. It'll give you the cheapest price across every month when searching for a Ontario International Airport to Buenos Aires ticket.

      • You don't need to check back in every day to see if fares have dropped when you create a Price Alert. We'll update you the moment there's an even bigger deal on cheap flights from ONT to Buenos Aires.

      • Save on your flight from Ontario International Airport to Buenos Aires with the help of our filters. Select your ideal times, number of stops and airlines, then sort the results by 'Cheapest' to see the best deals.

      Airports in Buenos Aires

      Buenos Aires Jorge Newbery Airfield (AEP)

      • Buenos Aires Jorge Newbery Airfield (AEP) to the centre of Buenos Aires takes about 25 minutes to reach by car. The centre is roughly 8 kilometres away.

      • It typically takes 40 minutes to get there by public transport.

      • If you have a late flight from Ontario International Airport to Buenos Aires, nothing beats the convenience of staying close to the terminal. Pick up your bags from the carousel and then be showered and relaxing not long after at one of these hotels near AEP:

      • To get the lowest price, book your ride from Buenos Aires Jorge Newbery Airfield about one week ahead of your flight from ONT to Buenos Aires.

      Buenos Aires Ministro Pistarini Intl Airport (EZE)

      • Buenos Aires Ministro Pistarini Intl Airport (EZE) is around 32 kilometres from the centre of Buenos Aires. Following your flight from Ontario International Airport to Buenos Aires, it'll take you around 30 minutes to get to the heart of the city in a taxi or ride-share.

      • If you're travelling on public transport, it'll take about 1 hour 15 minutes.

      • After stepping off your ONT to Buenos Aires flight, kick back at a hotel close to EZE. These are some great options that'll help you slip into relaxation mode:

      • Get what you want, not just what's left over. Reserving your ride from EZE one week in advance often means more savings and a wider choice of vehicles.

      Best time to go to Buenos Aires

      • December is the quietest month for flights from Ontario International Airport to Buenos Aires, while September is the busiest. Choose the best time to go to Buenos Aires based on whether you want a laid-back vibe or a lively atmosphere.

      • Book a Ontario International Airport to Buenos Aires plane ticket with a departure in January if you're eager to visit the city during its warmest month. Expect temperatures to range from 18ºC (64ºF) to 32ºC (90ºF).

      • For cooler conditions, look for a cheap ticket from ONT to Buenos Aires in July when temperatures average between 5ºC (41ºF) and 16ºC (61ºF).

      More about Buenos Aires

      • Start your Buenos Aires trip off on the right foot by choosing the ideal place to stay. Once you've booked your flight from Ontario International Airport to Buenos Aires, check out our selection of accommodation options including:

      • El Ateneo Grand Splendid and Teatro Colon are a couple of big attractions to add to your Buenos Aires travel itinerary. Keep the sightseeing going at Recoleta Cemetery.

      Explore more of Argentina

      • Rosario is just one of the many cities in Argentina waiting to be explored once you've seen the sights of Buenos Aires. Around 274 kilometres away to the northwest, popular attractions include Casa Natal Che Guevara, Monumento al Che Guevara and Casa Natal de Lionel Messi.

      • If you're looking to explore another major destination in Argentina, consider Mar Del Plata, roughly 386 kilometres south of Buenos Aires. Teatro Colon, Playa Popular and Aquasol Water Park are key highlights.

      Plan the rest of your trip from Ontario to Buenos Aires

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