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Cheap flights from London Heathrow Airport to Buenos Aires from £449

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BUE
9 Apr — 16 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Buenos Aires are usually found in May or April, booked 82 days in advance, depart on a Monday or Wednesday and return on a Monday

Cheap flight deals from Heathrow to Buenos Aires

Enter your travel dates to find the best prices.

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 10 March 2026.

Tue 12/522:05
LHR
-
EZE
1 stop30h 20m
Avianca
Wed 10/607:10
EZE
-
LHR
1 stop28h 25m
Avianca
Deal found 9/3£745
Tue 12/518:40
LHR
-
EZE
2 stops20h 10m
Multiple Airlines
Mon 8/616:35
EZE
-
LHR
1 stop20h 05m
Multiple Airlines
Deal found 7/3£748
Wed 20/522:05
LHR
-
EZE
1 stop35h 35m
Avianca
Tue 2/616:50
EZE
-
LHR
1 stop18h 45m
Avianca
Deal found 9/3£748
Mon 4/522:05
LHR
-
EZE
1 stop21h 35m
Avianca
Wed 13/516:50
EZE
-
LHR
1 stop18h 45m
Avianca
Deal found 10/3£749
Mon 11/520:05
LHR
-
EZE
2 stops42h 45m
SWISS
Wed 10/613:30
EZE
-
LHR
2 stops24h 20m
SWISS
Deal found 7/3£751
Tue 12/506:15
LHR
-
EZE
1 stop19h 50m
Air France
Thu 11/623:55
EZE
-
LHR
1 stop17h 30m
Air France
Deal found 7/3£753
Thu 23/422:05
LHR
-
AEP
1 stop35h 35m
Avianca
Thu 7/507:00
AEP
-
LHR
1 stop28h 35m
Avianca
Deal found 7/3£754
Mon 11/517:30
LHR
-
EZE
1 stop16h 55m
Lufthansa
Mon 8/616:35
EZE
-
LHR
1 stop20h 05m
Lufthansa
Deal found 7/3£754
Tue 12/518:40
LHR
-
EZE
2 stops20h 10m
SWISS
Wed 10/613:30
EZE
-
LHR
2 stops24h 20m
SWISS
Deal found 9/3£755
Tue 12/509:30
LHR
-
EZE
1 stop24h 55m
Multiple Airlines
Wed 10/613:30
EZE
-
LHR
2 stops24h 20m
Multiple Airlines
Deal found 9/3£757
Wed 13/517:30
LHR
-
EZE
1 stop16h 55m
Multiple Airlines
Wed 10/613:30
EZE
-
LHR
2 stops24h 20m
Multiple Airlines
Deal found 9/3£758
Tue 12/514:45
LHR
-
EZE
1 stop19h 05m
Multiple Airlines
Thu 11/623:55
EZE
-
LHR
1 stop17h 30m
Multiple Airlines
Deal found 7/3£761

Find 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 10 March 2026.

Round-trip from

£745

One-way from

£449

Popular in

December

Cheapest in

May

Average price

£990

Good round-trip deal

£1,022 or less
Avianca
  • Avianca
  • 12/5-10/6
  • 2 total stops
  • 58h 45m total
  • London to Buenos Aires
Search Deals
Avianca
  • Avianca
  • 4/5
  • 1 total stop
  • 35h 35m total
  • London to Buenos Aires
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Buenos Aires (BUE).
Search Deals

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 10 March 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Buenos Aires that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Tue 9/6

11:30-06:25

1 stop22h 55m

Buenos Aires Ministro Pistarini

Tue 16/6

16:35-22:10

1 stop25h 35m

£808

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Mon 20/4

20:05-10:50

2 stops42h 45m

Buenos Aires Ministro Pistarini

Wed 6/5

13:30-17:50

2 stops24h 20m

£855

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Mon 20/4

07:25-08:00

2 stops28h 35m

Buenos Aires Ministro Pistarini

Mon 27/4

21:00-09:40

2 stops32h 40m

£866

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Mon 20/4

07:25-08:00

2 stops28h 35m

Buenos Aires Ministro Pistarini

Wed 6/5

21:00-06:45

2 stops29h 45m

£867

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Tue 21/4

07:25-08:00

2 stops28h 35m

Buenos Aires Ministro Pistarini

Wed 29/4

21:00-06:45

2 stops29h 45m

£867

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Thu 7/5

06:55-08:00

2 stops29h 05m

Buenos Aires Ministro Pistarini

Mon 11/5

21:00-09:40

2 stops32h 40m

£870

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Tue 14/4

06:55-08:00

2 stops29h 05m

Buenos Aires Ministro Pistarini

Mon 27/4

21:00-06:55

2 stops29h 55m

£870

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Thu 16/4

13:40-08:00

1 stop22h 20m

Buenos Aires Ministro Pistarini

Tue 28/4

21:00-07:40

1 stop30h 40m

£876

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Mon 13/4

13:40-08:00

1 stop22h 20m

Buenos Aires Ministro Pistarini

Wed 29/4

21:00-07:45

1 stop30h 45m

£876

LondonBuenos Aires

LHR - EZE

LHREZE

London Heathrow

Tue 21/4

10:00-08:00

1 stop26h 00m

Buenos Aires Ministro Pistarini

Tue 28/4

21:00-11:35

1 stop34h 35m

£876

Flights are sorted by cheapest return flights first.

Deals found on 5/3

Showing 1-10 of 45 resultsSorted by cheapest first
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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 6 March 2026.

Booking 82 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 £657). Flying from London Heathrow Airport to Buenos Aires in July is currently the most expensive (average of £1,002). 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 10 March 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Buenos Aires as you normally would.

Weekly flight availability from London Heathrow Airport to Buenos Aires

Explore weekly flight availability from Heathrow to Buenos Aires. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 10 March 2026.

The most flights from LHR to BUE are scheduled on a Monday (3 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).

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.

Frankfurt am Main (FRA) – chosen by Cheapflights users on 27% 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 £778.

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 Madrid (MAD) have the shortest average one-way travel time for one-stop routes: 16h 25m.

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 Frankfurt am Main (FRA) offer the fastest connection on this route, with an average stopover time of 1h 11m.

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 10 March 2026.
Read through reviews of airlines operating flights from London Heathrow Airport to Buenos Aires, such as LATAM Airlines,Iberia, andLufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.
LATAM Airlines
7.4
Good
1,918 reviews
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.
Iberia
7.0
Good
3,133 reviews
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.
Lufthansa
6.8
Okay
7,840 reviews
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.
British Airways
6.7
Okay
7,781 reviews
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.
Avianca
6.5
Okay
2,498 reviews
LATAM Airlines
7.4
Good
1,918 reviews
Check prices

Overall

7.4

Boarding

7.5

Crew

8.0

Food

6.7

Comfort

7.3

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

JC,Jan 2026

FLN - GRU

Plane was late in FLN and missed connection in GRU. No alternative was given to me until 6 hours later and I was delayed by over 12 hours total.

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 22h 55m. Lufthansa provides one of the quickest options available for as low as £808. London Heathrow Airport and Buenos Aires are separated by a distance of 6915 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 Avianca. Our recent data shows that you can find tickets from as low as £698 on this airline. Additional options worth looking into are Iberia and Air France, starting at £743 and £751 round-trip. Avianca is 31% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from London Heathrow Airport to Buenos Aires one-way?

    £376 is the cheapest one-way deal found within the past few days, from Avianca. You may also be able to find cheap deals on Iberia and LATAM Airlines, with prices starting from £579 and £602, respectively.

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

    Looking at all options, your cheapest flight can be booked for £1,022. While the most popular route (London Heathrow - Buenos Aires Ministro Pistarini) can be booked for £755 on average, our data indicates £1,092 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 £657). Flying from London Heathrow Airport to Buenos Aires in July is currently the most expensive (average of £1,002). 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 10 March 2026.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest£698Average£800FlexibilityNo cancel feeOn-time71%
Search Avianca flights
IberiaCheapest£743Average£912FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Air FranceCheapest£751Average£1,410FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£836Average£1,150FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LATAM AirlinesCheapest£848Average£986FlexibilityNo cancel feeOn-time81%
Search LATAM Airlines flights
American AirlinesCheapest£872Average£900FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£910Average£1,096FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£913Average£1,236FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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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