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$454+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
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Cheap 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 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$966
(Priceline)

One-way from

$454
(Gotogate)

Popular in

December

Cheapest in

May

Average price

$958
Provider with most accurate pricing for Ontario-Buenos Aires (BUE) flight deals.
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Provider most trusted by Cheapflights users for Ontario-Buenos Aires (BUE) flights.
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From Ontario to Buenos Aires (BUE)
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One-way flight from Ontario to Buenos Aires (BUE)
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Highest demand for flights based on searches. 7% potential increase in price ($73 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find 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 26, 2025.

This Priceline deal was found by Cheapflights users on 3/26. 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.
Thu 10/1611:25 pmONT - EZE
2 stops20h 45mAvianca
Sat 10/257:10 amEZE - ONT
2 stops18h 45mAvianca
Deal found 3/26$942
This United Airlines deal was found by Cheapflights users on 3/24. 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 7/16:00 amONT - EZE
1 stop22h 00mUnited Airlines
Mon 9/19:00 pmEZE - ONT
2 stops29h 53mUnited Airlines
Deal found 3/24$1,025
This Mytrip deal was found by Cheapflights users on 3/25. 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 6/11:09 amONT - EZE
3 stops25h 01mMultiple Airlines
Mon 6/165:35 amEZE - ONT
3 stops21h 38mMultiple Airlines
Deal found 3/25$1,252
This Delta deal was found by Cheapflights users on 3/25. 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.
Fri 7/47:05 amONT - EZE
1 stop22h 40mDelta
Tue 7/158:10 pmEZE - ONT
1 stop30h 19mDelta
Deal found 3/25$1,288
This Expedia deal was found by Cheapflights users on 3/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/165:45 amONT - EZE
3 stops28h 40mAir Canada
Mon 12/15:00 pmEZE - ONT
3 stops36h 10mAir Canada
Deal found 3/25$1,625
This American Airlines deal was found by Cheapflights users on 3/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1412:53 pmONT - EZE
1 stop15h 17mAmerican Airlines
Wed 12/3110:30 pmEZE - ONT
1 stop18h 00mAmerican Airlines
Deal found 3/25$2,838

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 26, 2025.
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

Thu 6/12

11:25 pm-5:35 am

3 stops26h 10m

Buenos Aires Ministro Pistarini

Sat 6/28

6:40 am-9:55 pm

3 stops19h 15m

$966

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 7/1

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Mon 9/1

9:00 pm-10:53 pm

2 stops29h 53m

$1,025

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 6/1

1:09 am-6:10 am

3 stops25h 01m

Buenos Aires Ministro Pistarini

Mon 6/16

5:35 am-11:13 pm

3 stops21h 38m

$1,252

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 7/4

7:05 am-9:45 am

1 stop22h 40m

Buenos Aires Ministro Pistarini

Tue 7/15

8:10 pm-10:29 pm

1 stop30h 19m

$1,288

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 5/9

6:00 am-2:30 pm

3 stops28h 30m

Buenos Aires Ministro Pistarini

Mon 5/12

4:35 pm-8:34 pm

3 stops31h 59m

$1,725

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 5/15

10:00 am-7:15 am

2 stops17h 15m

Buenos Aires Ministro Pistarini

Wed 5/28

8:50 pm-11:50 am

2 stops19h 00m

$5,386

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 5/27

11:25 pm-12:10 am

2 stops20h 45m

$454

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 4/2

1:09 am-3:25 am

3 stops22h 16m

$585

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 4/20

6:10 am-8:00 am

1 stop21h 50m

$638

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 3/31

3:55 pm-2:30 pm

3 stops42h 35m

$754

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 12 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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy1 starTrust 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 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, April is the cheapest month in which you can book a flight from Ontario to Buenos Aires (average of $795). Flying from Ontario to Buenos Aires in December is currently the most expensive (average of $1,260). 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?

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 March 26, 2025.

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 afternoon could potentially save you up to 41% on airfare.

Rainfall in Buenos Aires by month

Plan your trip to Buenos Aires by taking into account the average rainfall totals by month.

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.

Temperature in Buenos Aires by month

Plan your trip to Buenos Aires by taking into account the average temperature totals by month.

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).

Reviews of airlines servicing Buenos Aires

Get insights into the airlines that provide service to Buenos Aires. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Buenos Aires. Reviews last updated March 26, 2025.
See what other customers who have flown with Delta, United Airlines and American Airlines from Ontario to Buenos Aires have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,891 reviews
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,608 reviews
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.0
Good
8,967 reviews
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Avianca
6.7
Okay
2,298 reviews
Delta
8.0
Very good
7,891 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 1 airline has flights from the Ontario airport to Buenos Aires. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • What are the cheapest airlines flying from Ontario to Buenos Aires round-trip?

    According to our current data, Avianca ($966), United Airlines ($1,025), and Delta ($1,288) offers the cheapest pricing from Ontario to Buenos Aires.

  • What are the cheapest airlines to fly from Ontario to Buenos Aires one-way?

    To fly one-way, consider booking your trip with Avianca, which is currently one of the cheapest options available, starting at $454. United Airlines flights start at $638 while deals on Air Canada start at $754 one-way.

  • 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, April is the cheapest month in which you can book a flight from Ontario to Buenos Aires (average of $795). Flying from Ontario to Buenos Aires in December is currently the most expensive (average of $1,260). 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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Top airline flying from Ontario to Buenos Aires

Discover the top airline that operate flights from Ontario to Buenos Aires. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,133Average$1,659FlexibilityNo cancel feeOn-time71%
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