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Cheap flights from Ontario to Buenos Aires from $561

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 4/2. 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
0 bags

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Find the cheapest flights from Ontario to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:00 am - 8:20 am
ONT
-
EZE
22h 20m
1 stop
United Airlines Logo
9:00 pm - 12:22 pm
EZE
-
ONT
19h 22m
2 stops
$1,051United Airlines
Tue, Mar 17 - Wed, Apr 29
United Airlines Logo
1:34 pm - 8:00 am
ONT
-
EZE
38h 26m
2 stops
United Airlines Logo
9:00 pm - 9:50 pm
EZE
-
ONT
28h 50m
1 stop
$1,082United Airlines
Sun, Mar 29 - Wed, Apr 8
LATAM Airlines Logo
10:25 pm - 9:35 am
ONT
-
EZE
31h 10m
2 stops
LATAM Airlines Logo
1:20 pm - 9:00 pm
EZE
-
ONT
35h 40m
2 stops
$1,083LATAM Airlines
Mon, Mar 23 - Sun, Apr 5
United Airlines Logo
6:00 am - 6:20 am
ONT
-
EZE
20h 20m
1 stop
United Airlines Logo
10:55 pm - 6:07 pm
EZE
-
ONT
23h 12m
1 stop
$1,087United Airlines
Fri, Mar 13 - Mon, Mar 23
United Airlines Logo
6:00 am - 6:20 am
ONT
-
EZE
20h 20m
1 stop
United Airlines Logo
9:00 pm - 12:38 pm
EZE
-
ONT
19h 38m
2 stops
$1,091United Airlines
Sun, Mar 22 - Mon, Apr 13
Multiple Airlines Logo
12:41 pm - 9:00 am
ONT
-
EZE
15h 19m
1 stop
Multiple Airlines Logo
4:55 pm - 8:55 pm
EZE
-
ONT
33h 00m
2 stops
$1,095Multiple Airlines
Sun, Feb 8 - Wed, Mar 4
United Airlines Logo
6:00 am - 8:20 am
ONT
-
EZE
22h 20m
1 stop
United Airlines Logo
9:00 pm - 9:50 pm
EZE
-
ONT
28h 50m
1 stop
$1,099United Airlines
Thu, Mar 19 - Sun, Mar 29
United Airlines Logo
6:15 am - 8:20 am
ONT
-
EZE
22h 05m
2 stops
United Airlines Logo
9:00 pm - 9:50 pm
EZE
-
ONT
28h 50m
1 stop
$1,104United Airlines
Thu, Mar 19 - Sun, Mar 29
Avianca Logo
11:35 pm - 5:00 am
ONT
-
EZE
25h 25m
3 stops
Avianca Logo
1:40 am - 9:45 pm
EZE
-
ONT
24h 05m
2 stops
$1,108Avianca
Sat, Jul 18 - Wed, Jul 29
Multiple Airlines Logo
10:20 pm - 2:50 am
ONT
-
EZE
47h 30m
2 stops
Multiple Airlines Logo
4:55 pm - 8:55 pm
EZE
-
ONT
33h 00m
2 stops
$1,112Multiple Airlines
Mon, Feb 16 - Mon, Feb 23

LATAM Airlines flights from Ontario to Buenos Aires

Our best LATAM Airlines deals on Ontario to Buenos Aires flight tickets
LATAM Airlines
Mar 23
ONT10:25 pmOntario
31h 10m
2 stops
EZE9:35 amBuenos Aires Ministro Pistarini
Apr 5
EZE1:20 pmBuenos Aires Ministro Pistarini
35h 40m
2 stops
ONT9:00 pmOntario
$1,083
LATAM Airlines
Mar 21
ONT12:57 pmOntario
16h 03m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Apr 5
EZE1:20 pmBuenos Aires Ministro Pistarini
35h 40m
2 stops
ONT9:00 pmOntario
$1,123
LATAM Airlines
May 15
ONT12:00 pmOntario
17h 45m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
May 24
EZE8:10 pmBuenos Aires Ministro Pistarini
29h 59m
1 stop
ONT10:09 pmOntario
$1,175

United Airlines flights from Ontario to Buenos Aires

Our best United Airlines deals on Ontario to Buenos Aires flight tickets
United Airlines
Mar 17
ONT6:00 amOntario
22h 20m
1 stop
EZE8:20 amBuenos Aires Ministro Pistarini
Apr 29
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 22m
2 stops
ONT12:22 pmOntario
$1,051
United Airlines
Mar 29
ONT1:34 pmOntario
38h 26m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Apr 8
EZE9:00 pmBuenos Aires Ministro Pistarini
28h 50m
1 stop
ONT9:50 pmOntario
$1,082
United Airlines
Mar 22
ONT6:00 amOntario
20h 20m
1 stop
EZE6:20 amBuenos Aires Ministro Pistarini
Apr 13
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 38m
2 stops
ONT12:38 pmOntario
$1,091

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 January 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

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Tue 3/17

6:00 am-8:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Wed 4/29

9:00 pm-12:22 pm

2 stops19h 22m

$1,051

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 3/29

1:34 pm-8:00 am

2 stops38h 26m

Buenos Aires Ministro Pistarini

Wed 4/8

9:00 pm-9:50 pm

1 stop28h 50m

$1,082

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 3/23

10:25 pm-9:35 am

2 stops31h 10m

Buenos Aires Ministro Pistarini

Sun 4/5

1:20 pm-9:00 pm

2 stops35h 40m

$1,083

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Fri 3/13

6:00 am-6:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Mon 3/23

10:55 pm-6:07 pm

1 stop23h 12m

$1,087

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 3/22

6:00 am-6:20 am

1 stop20h 20m

Buenos Aires Ministro Pistarini

Mon 4/13

9:00 pm-12:38 pm

2 stops19h 38m

$1,091

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sun 2/8

12:41 pm-9:00 am

1 stop15h 19m

Buenos Aires Ministro Pistarini

Wed 3/4

4:55 pm-8:55 pm

2 stops33h 00m

$1,095

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 3/19

6:00 am-8:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Sun 3/29

9:00 pm-9:50 pm

1 stop28h 50m

$1,099

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Thu 3/19

6:15 am-8:20 am

2 stops22h 05m

Buenos Aires Ministro Pistarini

Sun 3/29

9:00 pm-9:50 pm

1 stop28h 50m

$1,104

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Sat 7/18

11:35 pm-5:00 am

3 stops25h 25m

Buenos Aires Ministro Pistarini

Wed 7/29

1:40 am-9:45 pm

2 stops24h 05m

$1,108

OntarioBuenos Aires

ONT - EZE

ONTEZE

Ontario

Mon 2/16

10:20 pm-2:50 am

2 stops47h 30m

Buenos Aires Ministro Pistarini

Mon 2/23

4:55 pm-8:55 pm

2 stops33h 00m

$1,112

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 36% 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

15h 19m

Direct flights

None
The fastest flight from Ontario to Buenos Aires takes 15h 19m
There are no direct flights from Ontario to Buenos Aires. There are no popular flight routes from Ontario to Buenos Aires.
Search flight deals

  • 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 15h 19m.

  • 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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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