Which airlines fly to Buenos Aires?

Air Canada, Copa Airlines and Avianca are the top three most popular airlines that fly to Buenos Aires from Montreal Pierre Elliott Trudeau Intl Airport according to our data. Air Canada is the first choice among our users, with 62% of people opting to fly with this airline when travelling to Buenos Aires. Keep in mind that there are 6 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Montreal Pierre Elliott Trudeau Intl to Buenos Aires?

Arajet, Avianca, and Air Canada are the most popular carriers operating from Montreal Pierre Elliott Trudeau Intl to Buenos Aires

Which airport is the most popular layover for flights between Montreal Pierre Elliott Trudeau Intl Airport and Buenos Aires?

Sao Paulo (GRU) was the most common stop: 57% of momondo users choosing one-stop flights on this route connected there.

Which layover airport offers the lowest fares from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Flights via Punta Cana (PUJ) offer the lowest average round-trip price of C$ 1,038.

Which layover airport has the shortest connection time from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Punta Cana (PUJ) has the shortest average layover time for this route: 1h 35m.

Which layover airport has the shortest travel time from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Flights connecting via Punta Cana (PUJ) have the shortest average one-way travel time: 14h 45m.

How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

As of July 2025, there are 6 operators available to choose from for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires.

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

The travel and health documents you'll need for your trip to Buenos Aires may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Buenos Aires. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

C$ 432 Cheap Flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires in 2025

Q: What is the typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and Buenos Aires?

Prices are currently low for flights on this route. Typical prices usually range from C$ 1,092 to C$ 1,327. The lowest price recently found on this route was C$ 897.

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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Round-trip

One-way

Last minute

Cheap round-trip flights

6:45 a.m. - 12:05 a.m.YUL-EZE

15h 20m1 stop

11:07 a.m. - 12:15 a.m.EZE-YUL

15h 08m1 stop

C$ 897Arajet

Find Deal

Wed, 31 Dec - Thu, 26 Feb

11:25 p.m. - 3:20 p.m.YUL-EZE

14h 55m1 stop

7:35 a.m. - 8:35 p.m.EZE-YUL

15h 00m1 stop

C$ 1,035Avianca

Find Deal

Mon, 20 Oct - Mon, 17 Nov

8:41 a.m. - 3:50 a.m.YUL-EZE

18h 09m1 stop

3:57 a.m. - 11:43 p.m.EZE-YUL

21h 46m1 stop

C$ 1,066Copa Airlines

Find Deal

Thu, 16 Oct - Tue, 4 Nov

8:41 a.m. - 4:13 a.m.YUL-EZE

18h 32m1 stop

3:48 a.m. - 12:39 a.m.EZE-YUL

21h 51m1 stop

C$ 1,068Copa Airlines

Find Deal

Thu, 18 Sep - Wed, 24 Sep

6:30 a.m. - 9:20 a.m.YUL-EZE

24h 50m2 stops

10:05 p.m. - 9:01 p.m.EZE-YUL

24h 56m2 stops

C$ 1,071United Airlines

Find Deal

Wed, 31 Dec - Thu, 26 Feb

2:20 p.m. - 8:00 a.m.YUL-EZE

40h 40m2 stops

9:00 p.m. - 10:40 a.m.EZE-YUL

38h 40m2 stops

C$ 1,072United Airlines

Find Deal

Thu, 18 Sep - Thu, 25 Sep

9:50 p.m. - 2:30 p.m.YUL-EZE

39h 40m2 stops

4:35 p.m. - 6:15 a.m.EZE-YUL

14h 40m1 stop

C$ 1,085Air Canada

Find Deal

Thu, 18 Sep - Thu, 25 Sep

10:45 p.m. - 2:30 p.m.YUL-EZE

14h 45m1 stop

4:35 p.m. - 6:15 a.m.EZE-YUL

14h 40m1 stop

C$ 1,088Air Canada

Find Deal

Fri, 22 Aug - Thu, 4 Sep

9:28 a.m. - 9:00 a.m.YUL-EZE

22h 32m2 stops

8:55 p.m. - 5:04 p.m.EZE-YUL

22h 09m1 stop

C$ 1,111Delta

Find Deal

Tue, 28 Oct - Tue, 18 Nov

9:28 a.m. - 9:00 a.m.YUL-EZE

21h 32m2 stops

8:55 p.m. - 4:00 p.m.EZE-YUL

21h 05m2 stops

C$ 1,113Delta

Find Deal

Tue, 11 Nov - Tue, 25 Nov

Air Canada flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Our best Air Canada deals on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight tickets

Air Canada

18 Sep

YUL9:50 p.m.Montreal Pierre Elliott Trudeau Intl

39h 40m

2 stops

EZE2:30 p.m.Buenos Aires Ministro Pistarini

25 Sep

EZE4:35 p.m.Buenos Aires Ministro Pistarini

14h 40m

1 stop

YUL6:15 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,085

Find similar

Air Canada

22 Aug

YUL10:45 p.m.Montreal Pierre Elliott Trudeau Intl

14h 45m

1 stop

EZE2:30 p.m.Buenos Aires Ministro Pistarini

4 Sep

EZE4:35 p.m.Buenos Aires Ministro Pistarini

14h 40m

1 stop

YUL6:15 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,088

Find similar

Air Canada

22 Aug

YUL9:15 a.m.Montreal Pierre Elliott Trudeau Intl

28h 15m

2 stops

EZE2:30 p.m.Buenos Aires Ministro Pistarini

4 Sep

EZE4:35 p.m.Buenos Aires Ministro Pistarini

14h 40m

1 stop

YUL6:15 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,096

Find similar

Delta flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Our best Delta deals on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight tickets

Delta

28 Oct

YUL9:28 a.m.Montreal Pierre Elliott Trudeau Intl

22h 32m

2 stops

EZE9:00 a.m.Buenos Aires Ministro Pistarini

18 Nov

EZE8:55 p.m.Buenos Aires Ministro Pistarini

22h 09m

1 stop

YUL5:04 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,111

Find similar

Delta

11 Nov

YUL9:28 a.m.Montreal Pierre Elliott Trudeau Intl

21h 32m

2 stops

EZE9:00 a.m.Buenos Aires Ministro Pistarini

25 Nov

EZE8:55 p.m.Buenos Aires Ministro Pistarini

21h 05m

2 stops

YUL4:00 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,113

Find similar

Delta

12 Oct

YUL6:41 p.m.Montreal Pierre Elliott Trudeau Intl

18h 14m

2 stops

EZE1:55 p.m.Buenos Aires Ministro Pistarini

27 Oct

EZE8:55 p.m.Buenos Aires Ministro Pistarini

20h 11m

2 stops

YUL4:06 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 1,118

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momondo Fare Finder

Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

6:45 a.m.-12:05 a.m.

1 stop15h 20m

Buenos Aires Ministro Pistarini

Thu 26/2

11:07 a.m.-12:15 a.m.

1 stop15h 08m

C$ 897

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Mon 20/10

11:25 p.m.-3:20 p.m.

1 stop14h 55m

Buenos Aires Ministro Pistarini

Mon 17/11

7:35 a.m.-8:35 p.m.

1 stop15h 00m

C$ 1,035

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Thu 16/10

8:41 a.m.-3:50 a.m.

1 stop18h 09m

Buenos Aires Ministro Pistarini

Tue 4/11

3:57 a.m.-11:43 p.m.

1 stop21h 46m

C$ 1,066

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Thu 18/9

8:41 a.m.-4:13 a.m.

1 stop18h 32m

Buenos Aires Ministro Pistarini

Wed 24/9

3:48 a.m.-12:39 a.m.

1 stop21h 51m

C$ 1,068

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

6:30 a.m.-9:20 a.m.

2 stops24h 50m

Buenos Aires Ministro Pistarini

Thu 26/2

10:05 p.m.-9:01 p.m.

2 stops24h 56m

C$ 1,071

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Thu 18/9

2:20 p.m.-8:00 a.m.

2 stops40h 40m

Buenos Aires Ministro Pistarini

Thu 25/9

9:00 p.m.-10:40 a.m.

2 stops38h 40m

C$ 1,072

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Thu 18/9

9:50 p.m.-2:30 p.m.

2 stops39h 40m

Buenos Aires Ministro Pistarini

Thu 25/9

4:35 p.m.-6:15 a.m.

1 stop14h 40m

C$ 1,085

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Fri 22/8

10:45 p.m.-2:30 p.m.

1 stop14h 45m

Buenos Aires Ministro Pistarini

Thu 4/9

4:35 p.m.-6:15 a.m.

1 stop14h 40m

C$ 1,088

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Tue 28/10

9:28 a.m.-9:00 a.m.

2 stops22h 32m

Buenos Aires Ministro Pistarini

Tue 18/11

8:55 p.m.-5:04 p.m.

1 stop22h 09m

C$ 1,111

MontrealBuenos Aires

YUL - EZE

YULEZE

Montreal Pierre Elliott Trudeau Intl

Tue 11/11

9:28 a.m.-9:00 a.m.

2 stops21h 32m

Buenos Aires Ministro Pistarini

Tue 25/11

8:55 p.m.-4:00 p.m.

2 stops21h 05m

C$ 1,113

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport 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

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and Buenos Aires?

What is the cheapest month to fly to Buenos Aires?

The cheapest month to fly to Buenos Aires from Montreal Pierre Elliott Trudeau Intl Airport is in September. Flight prices, which tend to average around C$ 1,125, are often lower during this time because this is during the off-season. If you’re not able to fly to Buenos Aires in September, then May is your next best option. Flight prices from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires during May average around C$ 1,158.

What is the cheapest day to depart on your flight to Buenos Aires?

The cheapest day to depart on your flight to Buenos Aires is on a Wednesday when prices can be found for as low as C$ 1,217. This is often the case because there is less demand to fly during this day of the week. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires for around C$ 1,303.

What is the cheapest time of day to depart on your flight to Buenos Aires?

According to our data, the cheapest time of day to fly to Buenos Aires is in the afternoon. momondo users have found flights departing from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires in the afternoon for as low as C$ 1,221. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of C$ 1,288.

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

You are more likely to see cheaper flights to Buenos Aires from Montreal Pierre Elliott Trudeau Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Buenos Aires for around C$ 1,327 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Buenos Aires from Montreal Pierre Elliott Trudeau Intl Airport for as low as C$ 1,110 on momondo.

Can stopping save me money on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flights?

You could potentially save up to 6% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires (YUL to BUE) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Best price found	C$ 432
Fastest flight time	13h 50m
Direct flights	None
Airports in Buenos Aires	2 airports

The best one-way flight to Buenos Aires from Montreal Pierre Elliott Trudeau Intl Airport in the past 72 hours is C$ 432. The best round-trip flight deal from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires found on momondo in the last 72 hours is C$ 897.

The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires takes 13h 50m

There are no direct flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires. Popular non-direct routes for this connection are Montreal Pierre Elliott Trudeau Intl Airport - Buenos Aires Ministro Pistarini Airport and Montreal Pierre Elliott Trudeau Intl Airport - Buenos Aires Jorge Newbery Airport.

There are 2 airports near Buenos Aires: Buenos Aires Ministro Pistarini (EZE), Buenos Aires Jorge Newbery (AEP)

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How far is Montreal Pierre Elliott Trudeau Intl to Buenos Aires by plane?
There are 9030.9 km between Montreal Pierre Elliott Trudeau Intl and Buenos Aires. By plane, this route typically takes 14h 45m.
When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?
Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires were last updated today.
How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?
As of July 2025, there are 6 operators available to choose from for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires.
How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl 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 Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires.
What documentation or ID do you need to fly to Buenos Aires?
The travel and health documents you'll need for your trip to Buenos Aires may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Buenos Aires. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires is Air Canada (40% of total bookings). The next most popular airlines are Copa Airlines (19%), United Airlines (13%), and Delta (10%).

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires with momondo

Airline	Rating	Free Cancellation	Price
Arajet	PriceFrom C$ 694	Free Cancellation	Rating 7.1 32 reviews	Search Arajet flights
Avianca	PriceFrom C$ 702	Free Cancellation	Rating 6.7 2,388 reviews	Search Avianca flights
Delta	PriceFrom C$ 873	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
Copa Airlines	PriceFrom C$ 1,048	Free Cancellation	Rating 7.5 1,493 reviews	Search Copa Airlines flights
Air Canada	PriceFrom C$ 1,094	Free Cancellation	Rating 7.1 9,851 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 1,119	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Buenos Aires from Montreal.

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

Yes. momondo allows you to filter the results for Montreal to Buenos Aires flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Buenos Aires from Montreal.

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

Yes. momondo can track prices for Montreal to Buenos Aires flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Buenos Aires trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Find better results for your trip to Argentina

Fly into one of these airports located in Buenos Aires

Buenos Aires Jorge Newbery Airport

Buenos Aires Ministro Pistarini Airport

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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires from C$ 432

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Big names, great deals

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Filter for what you want

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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

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Air Canada flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Our best Air Canada deals on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight tickets

Delta flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Our best Delta deals on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight tickets

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Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires that are best for you.

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How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport 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

What is the typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and Buenos Aires?

What is the cheapest month to fly to Buenos Aires?

What is the cheapest day to depart on your flight to Buenos Aires?

What is the cheapest time of day to depart on your flight to Buenos Aires?

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

Can stopping save me money on Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flights?

You could potentially save up to 6% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires flight.

What is the cheapest airline that flies from Montreal Pierre Elliott Trudeau Intl to Buenos Aires?

Arajet, Avianca, and Air Canada are the most popular carriers operating from Montreal Pierre Elliott Trudeau Intl to Buenos Aires

Which airlines fly to Buenos Aires?

Which airport is the most popular layover for flights between Montreal Pierre Elliott Trudeau Intl Airport and Buenos Aires?

Sao Paulo (GRU) was the most common stop: 57% of momondo users choosing one-stop flights on this route connected there.

Which layover airport offers the lowest fares from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Flights via Punta Cana (PUJ) offer the lowest average round-trip price of C$ 1,038.

Which layover airport has the shortest travel time from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Flights connecting via Punta Cana (PUJ) have the shortest average one-way travel time: 14h 45m.

Which layover airport has the shortest connection time from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Punta Cana (PUJ) has the shortest average layover time for this route: 1h 35m.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Cheap Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires (YUL to BUE) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Best price found

Fastest flight time

Direct flights

Airports in Buenos Aires

How far is Montreal Pierre Elliott Trudeau Intl to Buenos Aires by plane?

When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

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

What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to Buenos Aires with momondo

Why use momondo?

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

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

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

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

An easier way to manage your Buenos Aires trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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 27.4 km from Buenos Aires