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Cheap flights from Ontario to Buenos Aires from $401

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Buenos Aires departing on 9/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Ontario to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
Avianca Logo
11:35 pm - 12:25 am
ONT
-
EZE
20h 50m
2 stops
Avianca Logo
7:10 am - 9:45 pm
EZE
-
ONT
18h 35m
2 stops
$772Avianca
Thu, Aug 20 - Thu, Aug 27
Avianca Logo
11:30 pm - 3:50 pm
ONT
-
EZE
36h 20m
2 stops
Avianca Logo
7:30 am - 8:55 pm
EZE
-
ONT
18h 25m
2 stops
$791Avianca
Tue, Oct 27 - Tue, Nov 3
Avianca Logo
11:30 pm - 5:50 am
ONT
-
EZE
26h 20m
2 stops
Avianca Logo
1:40 am - 8:55 pm
EZE
-
ONT
24h 15m
2 stops
$797Avianca
Tue, Oct 27 - Mon, Nov 2
Avianca Logo
11:35 pm - 3:40 pm
ONT
-
EZE
36h 05m
2 stops
Avianca Logo
4:50 pm - 9:45 pm
EZE
-
ONT
32h 55m
2 stops
$798Avianca
Tue, Aug 18 - Mon, Aug 24
Avianca Logo
11:35 pm - 12:25 am
ONT
-
EZE
20h 50m
2 stops
Avianca Logo
7:10 am - 9:45 pm
EZE
-
ONT
18h 35m
2 stops
$800Avianca
Tue, Aug 11 - Tue, Aug 18
Avianca Logo
11:35 pm - 3:40 pm
ONT
-
EZE
36h 05m
2 stops
Avianca Logo
4:50 pm - 9:45 pm
EZE
-
ONT
32h 55m
2 stops
$802Avianca
Thu, Sep 10 - Fri, Sep 25
Avianca Logo
11:30 pm - 12:35 am
ONT
-
EZE
21h 05m
2 stops
Avianca Logo
2:40 am - 8:55 pm
EZE
-
ONT
23h 15m
2 stops
$804Avianca
Tue, Oct 27 - Mon, Nov 2
Avianca Logo
11:35 pm - 1:20 am
ONT
-
EZE
21h 45m
2 stops
Avianca Logo
2:40 am - 8:55 pm
EZE
-
ONT
23h 15m
2 stops
$806Avianca
Tue, Sep 29 - Mon, Nov 23
Avianca Logo
11:35 pm - 12:25 am
ONT
-
EZE
20h 50m
2 stops
Avianca Logo
7:30 am - 9:55 pm
EZE
-
ONT
42h 25m
2 stops
$808Avianca
Tue, Oct 13 - Mon, Oct 26
Avianca Logo
11:30 pm - 1:35 am
ONT
-
EZE
22h 05m
2 stops
Avianca Logo
4:55 pm - 8:55 pm
EZE
-
ONT
33h 00m
2 stops
$816Avianca
Tue, Oct 27 - Fri, Nov 13

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Avianca flights from Ontario to Buenos Aires

Our best Avianca deals on Ontario to Buenos Aires flight tickets
Avianca
Aug 20
ONT11:35 pmOntario
20h 50m
2 stops
EZE12:25 amBuenos Aires Ministro Pistarini
Aug 27
EZE7:10 amBuenos Aires Ministro Pistarini
18h 35m
2 stops
ONT9:45 pmOntario
$772
Avianca
Oct 27
ONT11:30 pmOntario
36h 20m
2 stops
EZE3:50 pmBuenos Aires Ministro Pistarini
Nov 3
EZE7:30 amBuenos Aires Ministro Pistarini
18h 25m
2 stops
ONT8:55 pmOntario
$791
Avianca
Oct 27
ONT11:30 pmOntario
26h 20m
2 stops
EZE5:50 amBuenos Aires Ministro Pistarini
Nov 2
EZE1:40 amBuenos Aires Ministro Pistarini
24h 15m
2 stops
ONT8:55 pmOntario
$797

United Airlines flights from Ontario to Buenos Aires

Our best United Airlines deals on Ontario to Buenos Aires flight tickets
United Airlines
Jul 28
ONT5:45 amOntario
22h 15m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Aug 6
EZE9:00 pmBuenos Aires Ministro Pistarini
27h 42m
2 stops
ONT8:42 pmOntario
$1,282
United Airlines
Jul 27
ONT6:39 pmOntario
33h 21m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Aug 3
EZE9:00 pmBuenos Aires Ministro Pistarini
22h 29m
2 stops
ONT3:29 pmOntario
$1,306
United Airlines
Jul 25
ONT5:45 amOntario
22h 15m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Aug 3
EZE9:00 pmBuenos Aires Ministro Pistarini
22h 29m
2 stops
ONT3:29 pmOntario
$1,317

momondo 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, momondo users made 832,500 searches. Data last updated July 20, 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
Quickest round-trip

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 8/20

11:35 pm-12:25 am

2 stops20h 50m

Buenos Aires Ministro Pistarini

Thu 8/27

7:10 am-9:45 pm

2 stops18h 35m

$772

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/27

11:30 pm-3:50 pm

2 stops36h 20m

Buenos Aires Ministro Pistarini

Tue 11/3

7:30 am-8:55 pm

2 stops18h 25m

$791

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/27

11:30 pm-5:50 am

2 stops26h 20m

Buenos Aires Ministro Pistarini

Mon 11/2

1:40 am-8:55 pm

2 stops24h 15m

$797

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 8/18

11:35 pm-3:40 pm

2 stops36h 05m

Buenos Aires Ministro Pistarini

Mon 8/24

4:50 pm-9:45 pm

2 stops32h 55m

$798

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 8/11

11:35 pm-12:25 am

2 stops20h 50m

Buenos Aires Ministro Pistarini

Tue 8/18

7:10 am-9:45 pm

2 stops18h 35m

$800

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 9/10

11:35 pm-3:40 pm

2 stops36h 05m

Buenos Aires Ministro Pistarini

Fri 9/25

4:50 pm-9:45 pm

2 stops32h 55m

$802

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/27

11:30 pm-12:35 am

2 stops21h 05m

Buenos Aires Ministro Pistarini

Mon 11/2

2:40 am-8:55 pm

2 stops23h 15m

$804

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 9/29

11:35 pm-1:20 am

2 stops21h 45m

Buenos Aires Ministro Pistarini

Mon 11/23

2:40 am-8:55 pm

2 stops23h 15m

$806

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/13

11:35 pm-12:25 am

2 stops20h 50m

Buenos Aires Ministro Pistarini

Mon 10/26

7:30 am-9:55 pm

2 stops42h 25m

$808

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 10/27

11:30 pm-1:35 am

2 stops22h 05m

Buenos Aires Ministro Pistarini

Fri 11/13

4:55 pm-8:55 pm

2 stops33h 00m

$816

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Buenos Aires from

How to get the cheapest flight ticket from Ontario to Buenos Aires

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Ontario to Buenos Aires flights?

You could potentially save up to 14% on your flight if you consider stops on a Ontario to Buenos Aires flight.

When to book flights from Ontario to Buenos Aires

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Buenos Aires according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Buenos Aires (ONT to BUE) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Buenos Aires

Fastest flight time

20h 20m

Direct flights

None
The fastest flight from Ontario to Buenos Aires takes 20h 20m
There are no direct flights from Ontario to Buenos Aires. There are no popular flight routes from Ontario to Buenos Aires.
Search flight deals

Frequently asked questions about flying from Ontario to Buenos Aires

  • How far is Ontario to Buenos Aires by plane?

    The straight-line distance from Ontario to Buenos Aires is 6094.6 mi. By plane, this route typically takes 20h 20m.

  • When did momondo last update prices for flights from Ontario Airport to Buenos Aires?

    Prices for flights from Ontario Airport to Buenos Aires are refreshed on a daily basis.

  • How old do you have to be to fly from Ontario Airport to Buenos Aires?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Buenos Aires.

  • What documentation or ID do you need to fly to Buenos Aires?

    The required travel and health documents for your Buenos Aires trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Buenos Aires. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Buenos Aires?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Buenos Aires. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Buenos Aires with flexible booking policies on momondo?

All flight searches from Ontario to Buenos Aires on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Buenos Aires?

Once all potential Ontario to Buenos Aires flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Ontario to Buenos Aires right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Buenos Aires, momondo offers a useful price alert feature which will track prices for flights to Buenos Aires from Ontario and alert you when they change.

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1 adult
Wed 8/19
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Find better results for your trip to Argentina

Fly into one of these airports located in Buenos Aires

Airports listed have a maximum distance of 17.0 mi from Buenos Aires
Buenos Aires Jorge Newbery Airport
Buenos Aires Ministro Pistarini Airport