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Buenos Aires

$401+ 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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Apr 11 — Apr 181
Sat 4/11
Sat 4/18
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 March 12, 2026.

This Mytrip deal was found by Cheapflights users on 3/11. 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.
Wed 4/89:36 pm
ONT
-
EZE
3 stops26h 09m
Multiple Airlines
Mon 4/139:15 pm
EZE
-
ONT
3 stops29h 50m
Multiple Airlines
Deal found 3/11$898
This Mytrip deal was found by Cheapflights users on 3/10. 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.
Tue 10/1312:55 am
ONT
-
EZE
3 stops29h 05m
Multiple Airlines
Fri 11/64:55 pm
EZE
-
ONT
2 stops33h 00m
Multiple Airlines
Deal found 3/10$909
This Mytrip deal was found by Cheapflights users on 3/10. 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.
Sun 6/79:36 pm
ONT
-
EZE
3 stops32h 24m
Multiple Airlines
Fri 6/122:30 am
EZE
-
ONT
2 stops23h 15m
Multiple Airlines
Deal found 3/10$915
This Mytrip deal was found by Cheapflights users on 3/10. 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 10/159:36 pm
ONT
-
EZE
3 stops31h 40m
Multiple Airlines
Thu 11/57:30 am
EZE
-
ONT
2 stops18h 25m
Multiple Airlines
Deal found 3/10$924
This Mytrip deal was found by Cheapflights users on 3/10. 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.
Sun 10/1112:55 am
ONT
-
EZE
3 stops29h 05m
Multiple Airlines
Thu 11/57:30 am
EZE
-
ONT
2 stops18h 25m
Multiple Airlines
Deal found 3/10$925
This Mytrip deal was found by Cheapflights users on 3/11. 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.
Wed 4/89:36 pm
ONT
-
EZE
3 stops26h 09m
Multiple Airlines
Tue 4/145:00 am
EZE
-
ONT
3 stops46h 05m
Multiple Airlines
Deal found 3/11$926
This Mytrip deal was found by Cheapflights users on 3/9. 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.
Tue 5/511:35 pm
ONT
-
EZE
3 stops25h 25m
Avianca
Wed 5/132:30 am
EZE
-
ONT
2 stops23h 15m
Avianca
Deal found 3/9$956
This Mytrip deal was found by Cheapflights users on 3/7. 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 5/1411:35 pm
ONT
-
EZE
3 stops25h 25m
Avianca
Wed 5/202:30 am
EZE
-
ONT
2 stops23h 15m
Avianca
Deal found 3/7$977
This Mytrip deal was found by Cheapflights users on 3/11. 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.
Tue 9/229:36 pm
ONT
-
EZE
3 stops32h 24m
Multiple Airlines
Fri 10/22:30 am
EZE
-
ONT
2 stops23h 15m
Multiple Airlines
Deal found 3/11$991
This Mytrip deal was found by Cheapflights users on 3/6. 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.
Sat 9/1911:35 pm
ONT
-
EZE
3 stops25h 25m
Multiple Airlines
Fri 10/22:30 am
EZE
-
ONT
2 stops23h 15m
Multiple Airlines
Deal found 3/6$1,013
This Mytrip deal was found by Cheapflights users on 3/8. 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.
Wed 8/59:36 pm
ONT
-
EZE
3 stops26h 09m
Multiple Airlines
Mon 9/142:30 am
EZE
-
ONT
2 stops23h 15m
Multiple Airlines
Deal found 3/8$1,019

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 March 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$898
(Mytrip)

One-way from

$401
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$906
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. 11% potential increase in price ($120 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 12, 2026.
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

Cheapest round-trip

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 4/22

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Thu 5/21

9:00 pm-12:47 pm

2 stops19h 47m

$1,176

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 4/29

5:10 am-8:00 am

2 stops22h 50m

Buenos Aires Ministro Pistarini

Fri 5/8

9:00 pm-12:22 pm

2 stops19h 22m

$1,191

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 5/15

6:59 pm-8:00 am

2 stops33h 01m

Buenos Aires Ministro Pistarini

Sun 5/24

9:00 pm-9:55 pm

1 stop28h 55m

$1,194

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 8/9

5:00 am-8:00 am

2 stops47h 00m

Buenos Aires Ministro Pistarini

Sun 8/16

9:00 pm-10:58 pm

2 stops29h 58m

$1,211

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 4/24

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Tue 5/5

9:00 pm-12:38 pm

2 stops19h 38m

$1,216

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 4/23

6:00 am-8:00 am

2 stops22h 00m

Buenos Aires Ministro Pistarini

Fri 5/8

9:00 pm-12:22 pm

2 stops19h 22m

$1,216

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 5/5

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Sun 5/17

9:00 pm-12:22 pm

2 stops19h 22m

$1,216

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 4/27

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Thu 5/7

9:00 pm-12:38 pm

2 stops19h 38m

$1,226

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 4/14

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Thu 5/14

9:00 pm-5:52 pm

2 stops24h 52m

$1,226
Quickest round-trip

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 4/21

6:05 am-8:00 am

1 stop21h 55m

Buenos Aires Ministro Pistarini

Thu 5/28

9:00 pm-12:12 pm

2 stops19h 12m

$1,226

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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 FlightHub the most. FlightHub 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 $262). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $776). 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 21h 55m. 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 $262). Flying from Ontario to Buenos Aires in June is currently the most expensive (average of $776). 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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