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Cheap flights from London Heathrow Airport to Buenos Aires from £531

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 31/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BUE
12 Oct — 19 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from London Heathrow to Buenos Aires are usually found in January or February, booked 63 days in advance, depart on a Tuesday or Monday and return on a Monday

Cheap flight deals from Heathrow to Buenos Aires

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) 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 12 September 2025.

Round-trip from

£704

One-way from

£531

Popular in

December

Cheapest in

January

Average price

£883

Good round-trip deal

£1,189 or less
Avianca
  • Avianca
  • 12/11-23/11
  • 2 total stops
  • 69h 05m total
  • London to Buenos Aires
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31/12
  • 31/12
  • 3 total stops
  • 33h 05m total
  • London to Buenos Aires
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£47 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Buenos Aires (BUE).
Search Deals

Find flight deals from Heathrow to Buenos Aires

Cheapest flights from Heathrow to Buenos Aires
Explore the most affordable flight options available from Heathrow to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Wed 12/1121:40LHR - EZE
1 stop35h 10mAvianca
Sun 23/1101:40EZE - LHR
1 stop33h 55mAvianca
Deal found 10/9£704
Mon 10/1121:40LHR - EZE
1 stop21h 10mAvianca
Fri 28/1107:35EZE - LHR
1 stop28h 00mAvianca
Deal found 10/9£721
Wed 24/922:05LHR - EZE
1 stop30h 05mAvianca
Thu 23/1016:45EZE - LHR
1 stop18h 50mAvianca
Deal found 11/9£722
Wed 5/1121:40LHR - EZE
1 stop35h 10mAvianca
Tue 10/316:55EZE - LHR
1 stop18h 40mAvianca
Deal found 11/9£726
Sun 2/1121:40LHR - EZE
1 stop35h 10mAvianca
Sun 16/1101:40EZE - LHR
1 stop33h 55mAvianca
Deal found 10/9£727
Tue 4/1121:40LHR - EZE
1 stop35h 10mAvianca
Tue 24/216:55EZE - LHR
1 stop18h 40mAvianca
Deal found 11/9£733
Tue 4/1121:40LHR - EZE
1 stop29h 55mAvianca
Tue 10/316:55EZE - LHR
1 stop18h 40mAvianca
Deal found 11/9£734
Tue 11/1121:40LHR - EZE
1 stop35h 10mAvianca
Tue 25/1107:35EZE - LHR
1 stop28h 00mAvianca
Deal found 10/9£735
Thu 6/1121:40LHR - EZE
1 stop35h 10mAvianca
Mon 24/1101:40EZE - LHR
1 stop33h 55mAvianca
Deal found 11/9£737
Sun 26/1021:40LHR - AEP
1 stop35h 00mAvianca
Sun 9/1107:00AEP - LHR
1 stop28h 35mAvianca
Deal found 10/9£766
Mon 17/1121:40LHR - AEP
1 stop35h 00mAvianca
Wed 3/1207:00AEP - LHR
1 stop28h 35mAvianca
Deal found 11/9£774
Mon 22/922:05LHR - AEP
1 stop35h 35mAvianca
Fri 26/907:00AEP - LHR
1 stop28h 35mAvianca
Deal found 11/9£774

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow 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 858,174 searches. Data last updated 12 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Buenos Aires that are best for you.

Fly from

Heathrow

Fly to

Buenos Aires

Route

Depart

Return

Price

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Tue 10/3

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Tue 31/3

07:00-15:35

1 stop28h 35m

£769

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Sat 25/10

16:40-08:20

2 stops43h 40m

Buenos Aires Ministro Pistarini

Sun 23/11

23:55-07:30

1 stop28h 35m

£783

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Tue 18/11

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Thu 27/11

07:00-14:35

1 stop28h 35m

£791

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Tue 28/10

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Sat 8/11

07:00-14:35

1 stop28h 35m

£791

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Mon 3/11

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Sun 8/3

07:00-14:35

1 stop28h 35m

£792

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Mon 3/11

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Tue 10/3

07:00-14:35

1 stop28h 35m

£792

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Fri 7/11

12:05-09:20

1 stop24h 15m

Buenos Aires Ministro Pistarini

Mon 9/3

21:05-10:15

1 stop34h 10m

£836

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Wed 31/12

21:40-15:50

1 stop21h 10m

Buenos Aires Ministro Pistarini

Fri 17/4

06:50-15:35

1 stop28h 45m

£857

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Mon 27/10

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Mon 10/11

07:00-14:35

1 stop28h 35m

£860

LondonBuenos Aires

LHR - AEP

LHRAEP

London Heathrow

Wed 29/10

21:40-05:40

1 stop35h 00m

Buenos Aires Jorge Newbery

Thu 13/11

07:00-14:35

1 stop28h 35m

£860

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 46 results
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Best time to book a flight from Heathrow to Buenos Aires

Have a flexible travel schedule? Discover the best time to fly to Buenos Aires from Heathrow with our price prediction graph.
Estimated return 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 London Heathrow Airport to Buenos Aires

How far ahead should I book a flight from London Heathrow Airport to Buenos Aires?

Use this chart to determine the optimal time to book a return flight from Heathrow to Buenos Aires. Price data was last updated on 29 August 2025.

Booking 63 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Buenos Aires. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London Heathrow Airport to Buenos Aires?

Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Buenos Aires (average of £1,012). Flying from London Heathrow Airport to Buenos Aires in December is currently the most expensive (average of £1,250). 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 LHR to BUE?

Find hourly flight availability from Heathrow 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 12 September 2025.

It’s typically best to fly out from London Heathrow Airport to Buenos Aires in the morning. Doing so could potentially save you 21% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from London Heathrow Airport to Buenos Aires?

Use this chart to determine the cheapest time to fly return from Heathrow to Buenos Aires. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to Buenos Aires flight should consider departing on Sunday at midday when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London Heathrow Airport to Buenos Aires?

What’s the top stopover airport for flights from London Heathrow Airport to Buenos Aires?

Share of one-stop return flights from London Heathrow Airport to Buenos Aires chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Madrid (MAD) – chosen by Cheapflights users on 24% of one-stop itineraries from London Heathrow Airport to Buenos Aires on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Buenos Aires?

Average return fare for one-stop flights from London Heathrow Airport to Buenos Aires, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Toronto (YYZ) is the most affordable one-stop option, with an average return flight price of £701.

What’s the fastest stopover option from London Heathrow Airport to Buenos Aires?

Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Buenos Aires, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 16h 07m.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Buenos Aires?

Average stopover duration for one-stop one-way flights from London Heathrow Airport to Buenos Aires, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 30m.

Reviews of airlines servicing Buenos Aires

Get insights into the airlines that provide service to Buenos Aires. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Buenos Aires. Reviews last updated 12 September 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Buenos Aires, such as Finnair, LATAM Airlines, andIberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,323 reviews
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
LATAM Airlines
7.5
Good
1,847 reviews
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Iberia
7.0
Good
2,929 reviews
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,409 reviews
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,361 reviews
Finnair
7.6
Good
1,323 reviews
Check prices

Food

6.7

Overall

7.6

Comfort

7.5

Crew

8.1

Entertainment

6.9

Boarding

7.6

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Buenos Aires. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London Heathrow Airport to Buenos Aires?

    A quick flight from London Heathrow Airport to Buenos Aires can take about 35h. Avianca provides one of the quickest options available for as low as £769. London Heathrow Airport and Buenos Aires are separated by a distance of 6896 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from London Heathrow Airport to Buenos Aires round-trip?

    Our cheapest airline available from London Heathrow Airport to Buenos Aires is Air France. Our recent data shows that you can find tickets from as low as £442 on this airline. Additional options worth looking into are Air Canada and Iberia, starting at £639 and £706 round-trip. Air France is 54% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from London Heathrow Airport to Buenos Aires?

    Looking at all options, your cheapest flight can be booked for £1,068. While the most popular route (London Heathrow - Buenos Aires Ministro Pistarini) can be booked for £773 on average, our data indicates £1,887 when flying from London Heathrow Airport to Buenos Aires.

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

    Yes. In addition to deals on Heathrow to Buenos Aires flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Buenos Aires?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Buenos Aires.

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

    Yes. Cheapflights offers flight deals from Heathrow 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 London Heathrow Airport to Buenos Aires?

    Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Buenos Aires (average of £1,012). Flying from London Heathrow Airport to Buenos Aires in December is currently the most expensive (average of £1,250). 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.

See more FAQs

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.

Top 8 airlines flying from Heathrow to Buenos Aires

Discover the top 8 airlines that operate flights from Heathrow to Buenos Aires. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 12 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest£442Average£1,198FlexibilityNo cancel feeOn-time77%
Search Air France flights
Air CanadaCheapest£639Average£670FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
IberiaCheapest£706Average£949FlexibilityNo cancel feeOn-time77%
Search Iberia flights
FinnairCheapest£731Average£936FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£786Average£1,060FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£814Average£1,169FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£863Average£879FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
LATAM AirlinesCheapest£897Average£1,093FlexibilityNo cancel feeOn-time81%
Search LATAM Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Buenos Aires?

When you search for this flight from Heathrow to Buenos Aires, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Buenos Aires?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Buenos Aires.

Can Cheapflights find flights from Heathrow to Buenos Aires with no change fees?

Yes, we can. To see specific flights from Heathrow to Buenos Aires with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Heathrow to Buenos Aires become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Buenos Aires from Heathrow today and book when prices fit your budget.

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