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Buenos Aires

$402+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BUE
Sep 3 — Sep 101
Thu 9/3
Thu 9/10
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 August 4, 2026.

This Gotogate deal was found by Cheapflights users on 8/3. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:35 pm
ONT
-
EZE
2 stops21h 45m
Avianca
Mon 4/54:50 pm
EZE
-
ONT
2 stops32h 55m
Avianca
Deal found 8/3$779
This Avianca deal was found by Cheapflights users on 8/1. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Tue 10/207:10 am
EZE
-
ONT
2 stops18h 35m
Avianca
Deal found 8/1$781
This SmartFares deal was found by Cheapflights users on 7/31. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/110:30 pm
ONT
-
EZE
2 stops21h 05m
Avianca
Mon 12/214:55 pm
EZE
-
ONT
2 stops33h 00m
Avianca
Deal found 7/31$790
This SmartFares deal was found by Cheapflights users on 8/4. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:35 pm
ONT
-
EZE
2 stops36h 15m
Avianca
Sat 11/77:30 am
EZE
-
ONT
2 stops18h 25m
Avianca
Deal found 8/4$791
This oojo deal was found by Cheapflights users on 8/4. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Tue 9/157:10 am
EZE
-
ONT
2 stops18h 35m
Avianca
Deal found 8/4$804
This FlightHub deal was found by Cheapflights users on 7/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/811:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Tue 9/157:10 am
EZE
-
ONT
2 stops18h 35m
Avianca
Deal found 7/31$806
This oojo deal was found by Cheapflights users on 8/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1010:30 pm
ONT
-
EZE
2 stops36h 20m
Avianca
Wed 1/204:55 pm
EZE
-
ONT
2 stops33h 00m
Avianca
Deal found 8/2$808
This FlightHub deal was found by Cheapflights users on 7/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/811:35 pm
ONT
-
EZE
2 stops26h 05m
Avianca
Mon 9/144:50 pm
EZE
-
ONT
2 stops32h 55m
Avianca
Deal found 7/31$816
This FlightHub deal was found by Cheapflights users on 7/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:30 pm
ONT
-
EZE
2 stops22h 05m
Avianca
Mon 12/74:55 pm
EZE
-
ONT
2 stops33h 00m
Avianca
Deal found 7/31$826
This SmartFares deal was found by Cheapflights users on 8/3. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Wed 9/94:50 pm
EZE
-
ONT
2 stops32h 55m
Avianca
Deal found 8/3$829
This Avianca deal was found by Cheapflights users on 8/2. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1211:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Thu 9/177:10 am
EZE
-
ONT
2 stops18h 35m
Avianca
Deal found 8/2$844
This Avianca deal was found by Cheapflights users on 8/2. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:35 pm
ONT
-
EZE
2 stops20h 50m
Avianca
Fri 9/112:30 am
EZE
-
ONT
2 stops23h 15m
Avianca
Deal found 8/2$853

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 August 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$779
(Gotogate)

One-way from

$402
(Mytrip)

Popular in

December

Cheapest in

October

Average price

$797
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 ($92 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 4, 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

Thu 1/14

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Mon 1/25

11:55 pm-3:27 pm

2 stops20h 32m

$1,156

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 9/14

6:08 am-8:00 am

2 stops21h 52m

Buenos Aires Ministro Pistarini

Mon 9/21

9:00 pm-2:01 pm

2 stops21h 01m

$1,156

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 9/22

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Tue 9/29

9:00 pm-8:31 pm

2 stops27h 31m

$1,156

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 12/24

5:00 am-7:20 am

2 stops21h 20m

Buenos Aires Ministro Pistarini

Tue 12/29

11:55 pm-9:45 pm

1 stop26h 50m

$1,173
Quickest round-trip

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 8/25

9:15 am-8:00 am

1 stop18h 45m

Buenos Aires Ministro Pistarini

Mon 9/7

9:00 pm-2:01 pm

2 stops21h 01m

$1,273

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 9/8

6:08 am-8:00 am

2 stops21h 52m

Buenos Aires Ministro Pistarini

Sun 9/13

9:00 pm-12:50 pm

2 stops19h 50m

$1,313

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 9/12

6:08 am-8:00 am

2 stops21h 52m

Buenos Aires Ministro Pistarini

Sun 9/27

9:00 pm-12:46 pm

2 stops19h 46m

$1,343

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 9/18

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Fri 9/25

9:00 pm-8:58 pm

2 stops27h 58m

$1,343

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 1/15

6:00 am-7:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Sun 1/24

11:55 pm-5:47 pm

2 stops22h 52m

$1,357

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 12/29

5:45 am-7:20 am

1 stop20h 35m

Buenos Aires Ministro Pistarini

Sat 1/16

11:55 pm-5:47 pm

2 stops22h 52m

$1,389

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3
  • 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

No data available for this route at this time. Please check back soon.

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.

See more FAQs

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