How long is the flight from Ontario to Buenos Aires?

There are many flights that can get you from Ontario to Buenos Aires in 20h 20m. Fly via United Airlines to get the fastest option. Ontario and Buenos Aires are separated by a distance of 6096 mi.

In terms of precipitation, rainfall in Buenos Aires ranges from 2.0 - 3.9 inches per month. January is typically the wettest month, when rainfall can reach 3.9 in. June is typically the driest time to visit Buenos Aires when rainfall is around 2.0 in.

If weather is an important factor for your trip to Buenos Aires, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 51.8 F).

Most accurate provider : When it comes to deals on Ontario-Buenos Aires flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Buenos Aires flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-Buenos Aires flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-Buenos Aires flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Ontario to Buenos Aires?

Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Buenos Aires. You should not have trouble finding flights to Buenos Aires from Ontario; the airport handles an average of 0 outbound flights to Buenos Aires per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Ontario airport to Buenos Aires. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

Can I find deals for flights from Ontario to Buenos Aires that include hotel bookings?

Yes. In addition to deals on Ontario to Buenos Aires flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Buenos Aires?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Buenos Aires.

Can I find deals for business class flights from Ontario to Buenos Aires?

Yes. Cheapflights offers flight deals from Ontario to Buenos Aires by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$426+ Flights from Ontario to Buenos Aires

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Cheap flight deals from Ontario to Buenos Aires

Cheapest flights from Ontario to Buenos Aires
Explore the most affordable flight options available from Ontario to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

Tue 12/910:30 pmONT - EZE

2 stops26h 20mAvianca

Tue 12/166:15 amEZE - ONT

3 stops19h 40mAvianca

Deal found 12/2

$1,273

Thu 12/256:04 amONT - EZE

1 stop20h 16mUnited Airlines

Mon 1/1210:05 pmEZE - ONT

2 stops19h 42mUnited Airlines

Deal found 12/4

$1,285

Sun 12/710:30 pmONT - EZE

2 stops21h 05mAvianca

Mon 12/82:40 amEZE - ONT

2 stops23h 15mAvianca

Deal found 12/4

$1,325

Wed 12/106:00 amONT - EZE

1 stop20h 20mUnited Airlines

Wed 1/2110:05 pmEZE - ONT

2 stops19h 42mUnited Airlines

Deal found 12/2

$1,384

Best flights from Ontario to Buenos Aires
Discover carefully curated flight deals from Ontario to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 4, 2025.

Tue 2/38:00 amONT - EZE

1 stop20h 20mUnited Airlines

Mon 2/2310:05 pmEZE - ONT

2 stops19h 33mUnited Airlines

Deal found 12/3

$1,030

Tue 3/36:00 amONT - EZE

2 stops20h 20mUnited Airlines

Wed 3/189:05 pmEZE - ONT

2 stops19h 43mUnited Airlines

Deal found 12/2

$1,030

Tue 3/106:00 amONT - EZE

1 stop22h 20mUnited Airlines

Tue 3/179:05 pmEZE - ONT

2 stops19h 43mUnited Airlines

Deal found 12/4

$1,030

Mon 1/266:00 amONT - EZE

1 stop20h 20mUnited Airlines

Thu 2/2610:05 pmEZE - ONT

2 stops19h 33mUnited Airlines

Deal found 12/3

$1,030

Thu 2/196:00 amONT - EZE

1 stop20h 20mUnited Airlines

Thu 2/2610:05 pmEZE - ONT

2 stops19h 33mUnited Airlines

Deal found 12/2

$1,030

Tue 3/176:00 amONT - EZE

1 stop22h 20mUnited Airlines

Tue 3/249:05 pmEZE - ONT

2 stops19h 13mUnited Airlines

Deal found 12/3

$1,030

Thu 1/226:00 amONT - EZE

2 stops20h 20mUnited Airlines

Mon 2/210:05 pmEZE - ONT

2 stops19h 42mUnited Airlines

Deal found 12/1

$1,030

Tue 2/38:00 amONT - EZE

1 stop20h 20mUnited Airlines

Tue 2/2410:05 pmEZE - ONT

2 stops19h 33mUnited Airlines

Deal found 12/2

$1,030

Mon 3/235:15 amONT - EZE

2 stops23h 05mUnited Airlines

Tue 3/319:00 pmEZE - ONT

2 stops19h 20mUnited Airlines

Deal found 12/2

$1,030

Wed 1/215:05 amONT - EZE

2 stops21h 15mUnited Airlines

Thu 1/2911:55 pmEZE - ONT

2 stops27h 58mUnited Airlines

Deal found 12/2

$1,030

Last-minute flights from Ontario to Buenos Aires
Discover last-minute flight deals from Ontario to Buenos Aires. Data last updated December 4, 2025 and is based on user searches.

Mon 1/196:00 amONT - EZE

1 stop20h 20mUnited Airlines

Wed 1/2810:05 pmEZE - ONT

2 stops19h 42mUnited Airlines

Deal found 12/2

$1,105

Wed 1/2112:41 pmONT - EZE

1 stop15h 19mLATAM Airlines

Thu 1/2911:55 pmEZE - ONT

1 stop16h 36mLATAM Airlines

Deal found 12/2

$1,010

Wed 1/2112:41 pmONT - EZE

1 stop15h 19mDelta

Fri 1/3010:25 pmEZE - ONT

2 stops27h 40mDelta

Deal found 12/2

$1,070

Wed 1/2112:41 pmONT - EZE

1 stop15h 19mLATAM Airlines

Wed 1/288:55 pmEZE - ONT

1 stop19h 36mLATAM Airlines

Deal found 12/2

$1,085

Wed 1/2112:41 pmONT - EZE

1 stop15h 19mLATAM Airlines

Sat 1/3112:15 pmEZE - ONT

2 stops28h 16mLATAM Airlines

Deal found 12/2

$1,125

Thu 1/226:00 amONT - EZE

2 stops20h 20mUnited Airlines

Mon 2/210:05 pmEZE - ONT

2 stops19h 42mUnited Airlines

Deal found 12/1

$1,030

Fri 1/2312:41 pmONT - EZE

1 stop15h 19mDelta

Fri 1/3010:25 pmEZE - ONT

2 stops27h 40mDelta

Deal found 12/2

$1,110

Fri 1/236:00 amONT - EZE

1 stop20h 20mUnited Airlines

Fri 1/3011:55 pmEZE - ONT

1 stop27h 03mUnited Airlines

Deal found 12/2

$1,118

Mon 1/2612:41 pmONT - EZE

1 stop15h 19mDelta

Sun 2/88:55 pmEZE - ONT

1 stop19h 36mDelta

Deal found 12/3

$1,057

Tue 1/278:00 amONT - EZE

1 stop20h 20mUnited Airlines

Mon 3/910:55 pmEZE - ONT

1 stop23h 12mUnited Airlines

Deal found 12/2

$1,026

One-way flights from Ontario to Buenos Aires
Search for one-way flight options from Ontario to Buenos Aires. Find affordable one-way fares based on user searches. Data last updated December 4, 2025.

Tue 3/31:37 pmONT - EZE

3 stops38h 38mMultiple Airlines

Deal found 12/1

$426

Mon 3/911:34 pmONT - EZE

3 stops24h 32mMultiple Airlines

Deal found 12/2

$467

Tue 3/310:30 pmONT - EZE

2 stops21h 05mAvianca

Deal found 12/1

$505

Tue 2/310:30 pmONT - EZE

2 stops21h 05mAvianca

Deal found 12/2

$528

Sun 2/812:42 amONT - EZE

3 stops28h 33mMultiple Airlines

Deal found 12/4

$537

Tue 3/3111:25 pmONT - EZE

3 stops25h 45mAvianca

Deal found 12/3

$540

Thu 4/911:25 pmONT - EZE

2 stops20h 45mAvianca

Deal found 12/2

$550

Sun 1/1810:30 pmONT - EZE

2 stops22h 05mAvianca

Deal found 12/1

$556

Tue 12/3010:30 pmONT - EZE

3 stops25h 40mAvianca

Deal found 12/2

$563

Sun 3/111:34 pmONT - EZE

3 stops29h 41mMultiple Airlines

Deal found 12/3

$566

Sun 2/112:42 amONT - EZE

3 stops28h 33mMultiple Airlines

Deal found 12/2

$597

Find flight deals from Ontario to Buenos Aires

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$1,030 (United Airlines)
One-way from	$426 (Kiwi.com)
Popular in	December
Cheapest in	September
Average price	$1,299

Provider with most accurate pricing for Ontario-Buenos Aires (BUE) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Buenos Aires (BUE) flights.

Search Deals

From Ontario to Buenos Aires (BUE)

Search Deals

One-way flight from Ontario to Buenos Aires (BUE)

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($91 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 2/3

8:00 am-9:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Mon 2/23

10:05 pm-12:38 pm

2 stops19h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/3

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Wed 3/18

9:05 pm-12:48 pm

2 stops19h 43m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/10

6:00 am-8:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-12:48 pm

2 stops19h 43m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 1/26

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Thu 2/26

10:05 pm-12:38 pm

2 stops19h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 2/19

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Thu 2/26

10:05 pm-12:38 pm

2 stops19h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/17

6:00 am-8:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Tue 3/24

9:05 pm-12:18 pm

2 stops19h 13m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 1/22

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Mon 2/2

10:05 pm-12:47 pm

2 stops19h 42m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 2/3

8:00 am-9:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Tue 2/24

10:05 pm-12:38 pm

2 stops19h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 3/23

5:15 am-8:20 am

2 stops23h 05m

Buenos Aires Ministro Pistarini

Tue 3/31

9:00 pm-12:20 pm

2 stops19h 20m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 1/21

5:05 am-7:20 am

2 stops21h 15m

Buenos Aires Ministro Pistarini

Thu 1/29

11:55 pm-10:53 pm

2 stops27h 58m

$1,030

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/4

Showing 1-10 of 21 results

Compare providers for flights from Ontario to Buenos Aires

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Buenos Aires in December.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
AranGrant	Price Accuracy2 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Ontario-Buenos Aires flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Buenos Aires flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-Buenos Aires flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-Buenos Aires flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Buenos Aires

Have a flexible travel schedule? Discover the best time to fly to Buenos Aires 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 Buenos Aires

What is the cheapest month to book a flight from Ontario to Buenos Aires?

Currently, May is the cheapest month in which you can book a flight from Ontario to Buenos Aires (average of $269). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $770). 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 BUE?

One of the essential ways to save on airfare from Ontario to Buenos Aires is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 58% on airfare.

Related info for your journey

What airport do you fly from for flights from Ontario to Buenos Aires?
Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Buenos Aires. You should not have trouble finding flights to Buenos Aires from Ontario; the airport handles an average of 0 outbound flights to Buenos Aires per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Ontario airport to Buenos Aires. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.
How long is the flight from Ontario to Buenos Aires?
There are many flights that can get you from Ontario to Buenos Aires in 20h 20m. Fly via United Airlines to get the fastest option. Ontario and Buenos Aires are separated by a distance of 6096 mi.
Can I find deals for flights from Ontario to Buenos Aires that include hotel bookings?
Yes. In addition to deals on Ontario to Buenos Aires flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Buenos Aires?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Buenos Aires.
Can I find deals for business class flights from Ontario to Buenos Aires?
Yes. Cheapflights offers flight deals from Ontario to Buenos Aires 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 Buenos Aires?
Currently, May is the cheapest month in which you can book a flight from Ontario to Buenos Aires (average of $269). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $770). 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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$426+ Cheap flights from Ontario (ONT) to Buenos Aires (BUE)

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Buenos Aires with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Buenos Aires

Cheapest flights from Ontario to Buenos AiresExplore the most affordable flight options available from Ontario to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

Explore the most affordable flight options available from Ontario to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

Find flight deals from Ontario to Buenos Aires

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from Ontario to Buenos Aires

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Buenos Aires in December.

Best time to book a flight from Ontario to Buenos Aires

Have a flexible travel schedule? Discover the best time to fly to Buenos Aires from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Buenos Aires

What is the cheapest month to book a flight from Ontario to Buenos Aires?

What is the cheapest time of day to fly from ONT to BUE?

Find hourly flight availability from Ontario to Buenos Aires. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 4, 2025.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Buenos Aires. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Ontario to Buenos Aires?

How long is the flight from Ontario to Buenos Aires?

Can I find deals for flights from Ontario to Buenos Aires that include hotel bookings?

How can I find direct flights from Ontario to Buenos Aires?

Can I find deals for business class flights from Ontario to Buenos Aires?

What is the cheapest month to book a flight from Ontario to Buenos Aires?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Buenos Aires

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Cheapest flights from Ontario to Buenos Aires
Explore the most affordable flight options available from Ontario to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.