HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Buenos Aires

$399+ 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Buenos Aires with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 16, 2025.

Round-trip from

$900
(Priceline)

One-way from

$399
(Priceline)

Popular in

December

Cheapest in

September

Average price

$985
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 ($89 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 16, 2025.

This Priceline deal was found by Cheapflights users on 6/16. 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 9/1811:25 pmONT - EZE
2 stops20h 45mAvianca
Mon 9/292:30 amEZE - ONT
3 stops23h 25mAvianca
Deal found 6/16$900
This United Airlines deal was found by Cheapflights users on 6/16. 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.
Wed 8/276:00 amONT - EZE
2 stops22h 00mUnited Airlines
Thu 9/119:00 pmEZE - ONT
2 stops27h 33mUnited Airlines
Deal found 6/16$1,030
This Kissandfly.com deal was found by Cheapflights users on 6/15. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/76:00 amONT - EZE
1 stop22h 00mLufthansa
Wed 8/209:00 pmEZE - ONT
1 stop28h 25mLufthansa
Deal found 6/15$1,066
This Delta deal was found by Cheapflights users on 6/16. 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 7/2711:40 amONT - EZE
1 stop18h 05mDelta
Wed 10/158:10 pmEZE - ONT
1 stop30h 31mDelta
Deal found 6/16$1,296
This United deal was found by Cheapflights users on 6/15. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:09 amONT - EZE
1 stop20h 11mMultiple Airlines
Mon 12/12:30 amEZE - ONT
3 stops23h 30mMultiple Airlines
Deal found 6/15$1,409

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 June 16, 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 9/18

11:25 pm-12:10 am

2 stops20h 45m

Buenos Aires Ministro Pistarini

Mon 9/29

2:30 am-9:55 pm

3 stops23h 25m

$900

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 8/27

6:04 am-8:00 am

1 stop21h 56m

Buenos Aires Ministro Pistarini

Thu 9/11

9:00 pm-8:33 pm

2 stops27h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 8/7

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Wed 8/20

9:00 pm-9:25 pm

1 stop28h 25m

$1,066

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 7/27

11:40 am-9:45 am

1 stop18h 05m

Buenos Aires Ministro Pistarini

Wed 10/15

8:10 pm-10:41 pm

1 stop30h 31m

$1,296

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 11/20

6:09 am-7:20 am

1 stop20h 11m

Buenos Aires Ministro Pistarini

Mon 12/1

2:30 am-9:00 pm

3 stops23h 30m

$1,409

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 6/29

7:05 am-6:12 pm

2 stops31h 07m

Buenos Aires Ministro Pistarini

Fri 7/18

12:58 pm-10:30 am

2 stops25h 32m

$1,685

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 7/1

11:25 pm-1:25 am

3 stops22h 00m

$399

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 7/27

6:00 am-8:00 am

1 stop22h 00m

$648

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 6/23

1:09 am-3:25 am

3 stops22h 16m

$689

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/28

7:00 am-6:15 am

2 stops19h 15m

$1,150

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/14

Showing 1-10 of 15 results
1
2

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 June 16, 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 June 16, 2025.
See what other customers who have flown with Delta, LATAM Airlines and Copa 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
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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
7,963 reviews
Delta
8.0
Very good
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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.
LATAM Airlines
7.5
Good
1,785 reviews
Delta
8.0
Very good
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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.
Copa Airlines
7.5
Good
1,452 reviews
Delta
8.0
Very good
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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
8,801 reviews
Delta
8.0
Very good
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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
7,963 reviews

Food

7.3

Crew

8.5

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

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 ($900), United Airlines ($1,030), and Lufthansa ($1,066) 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 $399. United Airlines flights start at $648 while deals on LATAM Airlines start at $1,150 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Buenos Aires

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Ministro Pistarini flights
San Francisco to Ministro Pistarini flights
Los Angeles to Jorge Newbery flights
San Francisco to Jorge Newbery flights
Las Vegas to Ministro Pistarini flights
Ontario to Ministro Pistarini flights
San Diego to Ministro Pistarini flights
San Diego to Jorge Newbery flights
San Jose to Ministro Pistarini flights
Sacramento to Ministro Pistarini flights
Los Angeles to Cordoba flights
Oakland to Ministro Pistarini flights
Fresno to Ministro Pistarini flights
Santa Rosa to Ministro Pistarini flights
Los Angeles to Mendoza flights
Santa Ana to Ministro Pistarini flights
Monterey to Ministro Pistarini flights
San Jose to Jorge Newbery flights
Palm Springs to Ministro Pistarini flights
San Francisco to Mendoza flights
San Francisco to Cordoba flights
Sacramento to Jorge Newbery flights
San Francisco to San Carlos de Bariloche flights
Tijuana to Ministro Pistarini flights
Los Angeles to Rosario flights
San Francisco to Ushuaia flights
San Jose to Cordoba flights
San Jose to Mendoza flights
Los Angeles to Salta flights
Los Angeles to San Carlos de Bariloche flights
Las Vegas to Mendoza flights
Las Vegas to Cordoba flights
San Luis Obispo to Ministro Pistarini flights
Reno to Ministro Pistarini flights
Las Vegas to Rosario flights
Las Vegas to Ushuaia flights
Las Vegas to El Calafate flights
San Jose to Rosario flights

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 June 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,133Average$1,655FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.