What is the cheapest day to fly from Ontario to Buenos Aires?

Travelers seeking maximum savings on their Ontario to Buenos Aires flight should consider departing on Monday evenings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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.

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).

What is the cheapest day to fly round-trip from Ontario to Buenos Aires?

Wednesday flights are found to be more expensive to fly from Ontario to Buenos Aires. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Buenos Aires.

How far in advance should I book a flight from Ontario to Buenos Aires?

Find a great deal and save up to 33% by booking at least 29 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Ontario to Buenos Aires within the next two weeks, with the cheapest ticket starting at $804.

What is the cheapest month to fly from Ontario to Buenos Aires?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, September can be a great choice for travel to Buenos Aires. Flights to Buenos Aires from Ontario in September are about $958 on average during September, but can be found for as low as $561.

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.

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.

$531+ Cheap Flights from Ontario to Buenos Aires

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Cheap flight deals from Ontario to Buenos Aires

Round-trip from	$1,030 (United Airlines)
One-way from	$531 (Cheapflightsfares)
Popular in	December
Cheapest in	September
Average price	$871

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. 11% potential increase in price ($124 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).

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Average for round-trip flights in August 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 August 14, 2025.

Mon 12/85:05 amONT - EZE

2 stops21h 15mUnited Airlines

Tue 12/1610:05 pmEZE - ONT

2 stops19h 12mUnited Airlines

Deal found 8/12

$1,030

Wed 10/156:00 amONT - EZE

1 stop22h 00mUnited Airlines

Mon 10/279:05 pmEZE - ONT

1 stop28h 32mUnited Airlines

Deal found 8/12

$1,037

Sun 11/95:05 amONT - EZE

2 stops45h 15mUnited Airlines

Wed 11/1910:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/12

$1,048

Thu 11/66:05 amONT - EZE

1 stop22h 15mUnited Airlines

Sun 11/1610:05 pmEZE - ONT

2 stops24h 29mUnited Airlines

Deal found 8/12

$1,070

Fri 9/261:09 amONT - EZE

3 stops22h 36mMultiple Airlines

Sat 10/46:15 pmEZE - ONT

3 stops32h 58mMultiple Airlines

Deal found 8/12

$1,074

Sun 10/198:16 pmONT - EZE

2 stops31h 44mUnited Airlines

Sat 11/110:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/13

$1,089

Thu 9/186:04 amONT - EZE

1 stop21h 56mUnited Airlines

Tue 10/149:00 pmEZE - ONT

2 stops19h 51mUnited Airlines

Deal found 8/13

$1,105

Fri 10/316:00 amONT - EZE

2 stops20h 20mUnited Airlines

Sat 11/810:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/12

$1,110

Thu 11/610:30 pmONT - EZE

2 stops22h 05mMultiple Airlines

Fri 11/144:55 pmEZE - ONT

3 stops30h 49mMultiple Airlines

Deal found 8/13

$1,114

Mon 9/86:50 pmONT - EZE

3 stops30h 45mMultiple Airlines

Mon 9/155:55 amEZE - ONT

3 stops43h 30mMultiple Airlines

Deal found 8/11

$1,126

Best flights from Ontario to Buenos Aires
Discover carefully curated flight deals from Ontario to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2025.

Tue 11/46:05 amONT - EZE

1 stop20h 15mUnited Airlines

Wed 11/1210:05 pmEZE - ONT

2 stops19h 32mUnited Airlines

Deal found 8/12

$1,030

Thu 1/226:02 amONT - EZE

1 stop20h 18mUnited Airlines

Tue 2/2410:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/12

$1,030

Wed 10/86:00 amONT - EZE

1 stop22h 00mUnited Airlines

Wed 10/229:00 pmEZE - ONT

2 stops19h 51mUnited Airlines

Deal found 8/11

$1,030

Tue 2/36:00 amONT - EZE

2 stops20h 20mUnited Airlines

Tue 3/310:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/13

$1,030

Wed 10/156:00 amONT - EZE

1 stop22h 00mUnited Airlines

Mon 10/2710:55 pmEZE - ONT

2 stops27h 50mUnited Airlines

Deal found 8/12

$1,030

Mon 12/85:05 amONT - EZE

2 stops21h 15mUnited Airlines

Tue 12/1610:05 pmEZE - ONT

2 stops19h 12mUnited Airlines

Deal found 8/12

$1,030

Wed 11/55:05 amONT - EZE

2 stops21h 15mUnited Airlines

Thu 11/2710:05 pmEZE - ONT

2 stops19h 28mUnited Airlines

Deal found 8/13

$1,030

Tue 10/286:00 amONT - EZE

2 stops20h 20mUnited Airlines

Tue 11/1110:05 pmEZE - ONT

2 stops19h 26mUnited Airlines

Deal found 8/13

$1,030

Last-minute flights from Ontario to Buenos Aires
Discover last-minute flight deals from Ontario to Buenos Aires. Data last updated August 14, 2025 and is based on user searches.

Thu 8/2111:25 pmONT - EZE

2 stops20h 45mAvianca

Fri 9/51:40 amEZE - ONT

2 stops24h 15mAvianca

Deal found 8/12

$1,146

Thu 8/216:04 amONT - EZE

1 stop21h 56mUnited Airlines

Sat 9/69:00 pmEZE - ONT

2 stops19h 32mUnited Airlines

Deal found 8/12

$1,564

Thu 8/2811:25 pmONT - EZE

3 stops22h 00mAvianca

Mon 9/12:30 amEZE - ONT

3 stops23h 25mAvianca

Deal found 8/12

$1,070

Mon 9/86:50 pmONT - EZE

3 stops30h 45mMultiple Airlines

Mon 9/155:55 amEZE - ONT

3 stops43h 30mMultiple Airlines

Deal found 8/11

$1,126

Tue 9/96:04 amONT - EZE

2 stops38h 06mMultiple Airlines

Tue 9/166:50 amEZE - ONT

2 stops42h 35mMultiple Airlines

Deal found 8/13

$1,149

Wed 9/176:04 amONT - EZE

1 stop21h 56mUnited Airlines

Mon 10/139:00 pmEZE - ONT

2 stops22h 02mUnited Airlines

Deal found 8/12

$1,151

Thu 9/186:04 amONT - EZE

1 stop21h 56mUnited Airlines

Tue 10/149:00 pmEZE - ONT

2 stops19h 51mUnited Airlines

Deal found 8/13

$1,105

Mon 9/229:11 pmONT - EZE

3 stops26h 34mMultiple Airlines

Wed 10/227:10 pmEZE - ONT

3 stops30h 45mMultiple Airlines

Deal found 8/12

$1,137

Fri 9/261:09 amONT - EZE

3 stops22h 36mMultiple Airlines

Sat 10/46:15 pmEZE - ONT

3 stops32h 58mMultiple Airlines

Deal found 8/12

$1,074

Sat 9/2711:25 pmONT - EZE

2 stops20h 45mAvianca

Fri 10/31:40 amEZE - ONT

2 stops24h 15mAvianca

Deal found 8/12

$1,156

One-way flights from Ontario to Buenos Aires
Search for one-way flight options from Ontario to Buenos Aires. Find affordable one-way fares based on user searches. Data last updated August 14, 2025.

Sat 10/411:25 pmONT - EZE

3 stops25h 25mAvianca

Deal found 8/11

$531

Sat 9/131:09 amONT - EZE

3 stops23h 51mMultiple Airlines

Deal found 8/14

$547

Thu 9/411:25 pmONT - EZE

2 stops20h 45mAvianca

Deal found 8/12

$551

Tue 1/610:30 pmONT - EZE

2 stops21h 05mAvianca

Deal found 8/12

$635

Sun 9/76:05 amONT - EZE

2 stops23h 40mDelta

Deal found 8/12

$643

Sat 9/136:04 amONT - EZE

1 stop21h 56mUnited Airlines

Deal found 8/14

$648

Thu 9/116:50 pmONT - EZE

2 stops33h 10mUnited Airlines

Deal found 8/13

$654

Fri 10/1010:00 pmONT - EZE

1 stop31h 45mDelta

Deal found 8/13

$671

Cheapflights Fare Finder

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

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 11/4

6:05 am-7:20 am

1 stop20h 15m

Buenos Aires Ministro Pistarini

Wed 11/12

10:05 pm-12:37 pm

2 stops19h 32m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 1/22

6:02 am-7:20 am

1 stop20h 18m

Buenos Aires Ministro Pistarini

Tue 2/24

10:05 pm-12:33 pm

2 stops19h 28m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 10/8

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Wed 10/22

9:00 pm-12:51 pm

2 stops19h 51m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 2/3

6:00 am-7:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Tue 3/3

10:05 pm-12:33 pm

2 stops19h 28m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 10/15

6:00 am-8:00 am

1 stop22h 00m

Buenos Aires Ministro Pistarini

Mon 10/27

10:55 pm-10:45 pm

2 stops27h 50m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 12/8

5:05 am-7:20 am

2 stops21h 15m

Buenos Aires Ministro Pistarini

Tue 12/16

10:05 pm-12:17 pm

2 stops19h 12m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Wed 11/5

5:05 am-7:20 am

2 stops21h 15m

Buenos Aires Ministro Pistarini

Thu 11/27

10:05 pm-12:33 pm

2 stops19h 28m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/28

6:00 am-6:20 am

2 stops20h 20m

Buenos Aires Ministro Pistarini

Tue 11/11

10:05 pm-12:31 pm

2 stops19h 26m

$1,030

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 10/4

11:25 pm-4:50 am

3 stops25h 25m

$531

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 9/13

1:09 am-5:00 am

3 stops23h 51m

$547

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 16 results

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?

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.

Reviews of airlines servicing Buenos Aires

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

8,916 reviews

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

8,916 reviews

United Airlines

7.4

Good

8,916 reviews

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

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.
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.

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$531+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Buenos Aires with Cheapflights

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2. Select your favorite providers

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Cheap flight deals from Ontario to Buenos Aires

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Buenos Aires

Cheapest flights from Ontario to Buenos AiresExplore 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 14, 2025.

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 14, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Buenos Aires that are best for you.

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.

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?

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 August 14, 2025.

Reviews of airlines servicing Buenos Aires

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.

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?

Can I find deals for flights from Ontario to Buenos Aires that include hotel bookings?

How can I find direct flights from Ontario to Buenos Aires?

Can I find deals for business class flights from Ontario to Buenos Aires?

What is the cheapest month to book a flight from Ontario to Buenos Aires?

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

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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 14, 2025.