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$462+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,030
(United Airlines)

One-way from

$462
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$840
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. 12% potential increase in price ($132 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 14, 2025.

This United Airlines deal was found by Cheapflights users on 10/14. 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.
Mon 12/86:00 amONT - EZE
2 stops20h 20mUnited Airlines
Wed 12/1710:05 pmEZE - ONT
2 stops19h 33mUnited Airlines
Deal found 10/14$1,030
This United Airlines deal was found by Cheapflights users on 10/13. 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 12/166:00 amONT - EZE
1 stop20h 20mUnited Airlines
Tue 1/1311:55 pmEZE - ONT
1 stop27h 03mUnited Airlines
Deal found 10/13$1,038
This United Airlines deal was found by Cheapflights users on 10/13. 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.
Thu 12/115:05 amONT - EZE
2 stops21h 15mUnited Airlines
Tue 1/1310:05 pmEZE - ONT
1 stop28h 53mUnited Airlines
Deal found 10/13$1,042
This United Airlines deal was found by Cheapflights users on 10/12. 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 12/26:00 amONT - EZE
1 stop20h 20mUnited Airlines
Fri 12/1211:55 pmEZE - ONT
2 stops22h 42mUnited Airlines
Deal found 10/12$1,070
This United Airlines deal was found by Cheapflights users on 10/13. 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.
Thu 12/116:00 amONT - EZE
1 stop22h 20mUnited Airlines
Fri 1/1611:55 pmEZE - ONT
1 stop27h 03mUnited Airlines
Deal found 10/13$1,078
This United Airlines deal was found by Cheapflights users on 10/12. 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.
Mon 12/156:00 amONT - EZE
2 stops20h 20mUnited Airlines
Fri 12/2611:55 pmEZE - ONT
1 stop26h 57mUnited Airlines
Deal found 10/12$1,083
This United Airlines deal was found by Cheapflights users on 10/13. 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 11/266:05 amONT - EZE
1 stop20h 15mUnited Airlines
Thu 12/1110:05 pmEZE - ONT
2 stops19h 27mUnited Airlines
Deal found 10/13$1,105
This United Airlines deal was found by Cheapflights users on 10/12. 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.
Sat 12/136:00 amONT - EZE
2 stops20h 20mUnited Airlines
Sun 12/2810:05 pmEZE - ONT
2 stops19h 33mUnited Airlines
Deal found 10/12$1,110
This United Airlines deal was found by Cheapflights users on 10/13. 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.
Thu 12/116:00 amONT - EZE
1 stop22h 20mUnited Airlines
Wed 1/1411:55 pmEZE - ONT
1 stop27h 03mUnited Airlines
Deal found 10/13$1,114
This United Airlines deal was found by Cheapflights users on 10/13. 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.
Sat 12/135:05 amONT - EZE
2 stops21h 15mUnited Airlines
Wed 12/2410:05 pmEZE - ONT
2 stops19h 33mUnited Airlines
Deal found 10/13$1,145

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 October 14, 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

Wed 1/21

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Thu 2/12

10:05 pm-12:18 pm

2 stops19h 13m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 1/22

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Tue 2/24

10:05 pm-12:18 pm

2 stops19h 13m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 12/10

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Wed 12/17

10:05 pm-12:38 pm

2 stops19h 33m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 2/9

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Thu 2/19

10:05 pm-12:18 pm

2 stops19h 13m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 12/9

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Tue 12/16

10:05 pm-12:32 pm

2 stops19h 27m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 12/8

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Tue 12/16

10:05 pm-12:32 pm

2 stops19h 27m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 1/7

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Wed 1/14

11:55 pm-5:43 pm

2 stops22h 48m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 12/16

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Tue 12/23

11:55 pm-9:52 pm

1 stop26h 57m

$1,038

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 3/11

6:02 am-6:20 am

1 stop20h 18m

Buenos Aires Ministro Pistarini

Wed 3/25

9:05 pm-9:46 pm

1 stop28h 41m

$1,038

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/21

9:11 pm-10:07 am

3 stops32h 56m

$487

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/14

Showing 1-10 of 21 results
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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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 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 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 $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?

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 October 14, 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 evening could potentially save you up to 58% on airfare.

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 October 14, 2025.
Read through reviews of airlines operating flights from Ontario to Buenos Aires, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,976 reviews

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,976 reviews
United Airlines
7.4
Good
8,976 reviews

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 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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