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Buenos Aires

$561+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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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 January 20, 2026.

This Mytrip deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1912:42 am
ONT
-
EZE
3 stops29h 38m
Multiple Airlines
Wed 3/252:40 am
EZE
-
ONT
2 stops23h 15m
Multiple Airlines
Deal found 1/20$983
This United Airlines deal was found by Cheapflights users on 1/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:00 am
ONT
-
EZE
1 stop22h 20m
United Airlines
Wed 4/299:00 pm
EZE
-
ONT
2 stops19h 22m
United Airlines
Deal found 1/18$1,051
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/291:34 pm
ONT
-
EZE
2 stops38h 26m
United Airlines
Wed 4/89:00 pm
EZE
-
ONT
1 stop28h 50m
United Airlines
Deal found 1/19$1,082
This KAYAK deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2310:25 pm
ONT
-
EZE
2 stops31h 10m
LATAM Airlines
Sun 4/51:20 pm
EZE
-
ONT
2 stops35h 40m
LATAM Airlines
Deal found 1/19$1,083
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/226:15 am
ONT
-
EZE
2 stops20h 05m
United Airlines
Mon 4/139:00 pm
EZE
-
ONT
2 stops19h 14m
United Airlines
Deal found 1/19$1,091
This Priceline deal was found by Cheapflights users on 1/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/812:41 pm
ONT
-
EZE
1 stop15h 19m
Multiple Airlines
Wed 3/44:55 pm
EZE
-
ONT
2 stops33h 00m
Multiple Airlines
Deal found 1/18$1,095
This United Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:30 pm
ONT
-
EZE
2 stops33h 30m
United Airlines
Fri 9/189:00 pm
EZE
-
ONT
1 stop28h 21m
United Airlines
Deal found 1/19$1,104
This Priceline deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/1610:20 pm
ONT
-
EZE
2 stops47h 30m
Multiple Airlines
Mon 2/234:55 pm
EZE
-
ONT
2 stops33h 00m
Multiple Airlines
Deal found 1/19$1,112
This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1210:25 pm
ONT
-
EZE
1 stop31h 20m
Delta
Sun 4/198:10 pm
EZE
-
ONT
1 stop28h 48m
Delta
Deal found 1/20$1,116
This LATAM Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1812:57 pm
ONT
-
EZE
1 stop16h 03m
LATAM Airlines
Wed 3/258:55 pm
EZE
-
ONT
1 stop18h 52m
LATAM Airlines
Deal found 1/19$1,122
This KAYAK deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2112:57 pm
ONT
-
EZE
1 stop16h 03m
LATAM Airlines
Sun 4/51:20 pm
EZE
-
ONT
2 stops35h 40m
LATAM Airlines
Deal found 1/19$1,123

Find flight deals from Ontario to Buenos Aires

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Buenos Aires (BUE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,051
(United Airlines)

One-way from

$561
(Priceline)

Popular in

December

Cheapest in

November

Average price

$968
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. 9% potential increase in price ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Buenos Aires that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 20, 2026.
Use the filters below to find and compare flights from Ontario to Buenos Aires that are best for you.

Fly from

Ontario

Fly to

Buenos Aires

Route

Depart

Return

Price

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/17

6:15 am-8:20 am

2 stops22h 05m

Buenos Aires Ministro Pistarini

Wed 4/29

9:00 pm-12:22 pm

2 stops19h 22m

$1,051

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 4/21

6:00 am-8:00 am

2 stops22h 00m

Buenos Aires Ministro Pistarini

Tue 4/28

9:00 pm-12:14 pm

2 stops19h 14m

$1,051

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 4/20

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Tue 4/28

9:00 pm-12:14 pm

2 stops19h 14m

$1,051

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 4/18

6:00 am-8:00 am

2 stops22h 00m

Buenos Aires Ministro Pistarini

Mon 4/27

9:00 pm-12:14 pm

2 stops19h 14m

$1,091

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 3/13

6:00 am-6:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Mon 3/23

10:55 pm-5:41 pm

2 stops22h 46m

$1,091

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 3/14

6:00 am-8:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Sun 3/22

9:05 pm-10:57 pm

2 stops29h 52m

$1,131

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 5/1

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Sun 5/31

9:00 pm-11:06 pm

2 stops30h 06m

$1,131

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 3/4

1:15 pm-9:00 am

1 stop14h 45m

$653

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 3/2

1:15 pm-9:00 am

1 stop14h 45m

$653

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/3

1:15 pm-9:00 am

1 stop14h 45m

$653

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 17 results
1
2

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 January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Buenos Aires flight deals on Cheapflights vs. FlightHub >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 AranGrant the most. AranGrant 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 $268). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $779). 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.

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?

    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 22h 05m. 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 $268). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $779). 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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