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Cheap flights from Klagenfurt to London Heathrow Airport from £139

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
KLU — LHR
2 Jan — 9 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Klagenfurt to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Klagenfurt to Heathrow
Explore the most affordable flight options available from Klagenfurt to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 December 2025.

Sat 13/1205:45KLU - LHR
1 stop9h 20mMultiple Airlines
Tue 16/1206:30LHR - KLU
2 stops6h 25mMultiple Airlines
Deal found 1/12£272
Tue 9/1214:50KLU - LHR
2 stops9h 05mMultiple Airlines
Thu 1/119:25LHR - KLU
1 stop17h 25mMultiple Airlines
Deal found 2/12£274
Sat 13/1214:50KLU - LHR
2 stops7h 10mLufthansa
Tue 16/1206:30LHR - KLU
2 stops6h 25mLufthansa
Deal found 1/12£295
Tue 9/1214:50KLU - LHR
1 stop7h 50mAustrian Airlines
Thu 1/119:25LHR - KLU
1 stop17h 25mAustrian Airlines
Deal found 2/12£298
Tue 9/1214:50KLU - LHR
2 stops9h 05mLufthansa
Thu 1/116:40LHR - KLU
2 stops20h 10mLufthansa
Deal found 2/12£299
Sat 20/1216:00KLU - LHR
2 stops7h 20mMultiple Airlines
Mon 29/1206:00LHR - KLU
1 stop6h 50mMultiple Airlines
Deal found 1/12£307
Sat 13/1214:50KLU - LHR
1 stop4h 50mMultiple Airlines
Mon 15/1207:30LHR - KLU
2 stops14h 55mMultiple Airlines
Deal found 2/12£312
Fri 12/1214:50KLU - LHR
1 stop7h 50mMultiple Airlines
Mon 15/1206:30LHR - KLU
2 stops6h 25mMultiple Airlines
Deal found 1/12£320
Sat 6/1214:50KLU - LHR
1 stop4h 50mMultiple Airlines
Mon 8/1206:30LHR - KLU
2 stops6h 25mMultiple Airlines
Deal found 1/12£341

Find flight deals from Klagenfurt to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Klagenfurt (KLU) to Heathrow (LHR). 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 3 December 2025.

Round-trip from

£172

One-way from

£139

Popular in

December

Cheapest in

January

Average price

£419
Austrian Airlines
  • Austrian Airlines
  • 15/1-22/1
  • 2 total stops
  • 26h 25m total
  • Klagenfurt to London
Search Deals
Austrian Airlines
  • Austrian Airlines
  • 17/4
  • 1 total stop
  • 18h 20m total
  • Klagenfurt to London
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£39 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Klagenfurt to Heathrow 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 3 December 2025.
Use the filters below to find and compare flights from Klagenfurt to London Heathrow Airport that are best for you.

Fly from

Klagenfurt

Fly to

Heathrow

Route

Depart

Return

Price

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Mon 26/1

15:15-18:40

1 stop4h 25m

London Heathrow

Sat 31/1

06:00-10:30

1 stop3h 30m

£174

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Fri 13/3

14:50-21:40

1 stop7h 50m

London Heathrow

Sun 15/3

09:05-23:25

1 stop13h 20m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Thu 8/1

15:15-18:40

1 stop4h 25m

London Heathrow

Sat 10/1

06:00-10:30

1 stop3h 30m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Fri 9/1

15:15-18:40

1 stop4h 25m

London Heathrow

Mon 12/1

06:00-13:50

1 stop6h 50m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Fri 13/2

15:15-21:40

1 stop7h 25m

London Heathrow

Mon 16/2

06:00-13:50

1 stop6h 50m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Fri 9/1

15:15-18:40

1 stop4h 25m

London Heathrow

Sat 10/1

06:00-10:30

1 stop3h 30m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Sat 17/1

16:00-21:40

1 stop6h 40m

London Heathrow

Mon 19/1

09:05-13:50

1 stop3h 45m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Sat 10/1

16:00-21:40

1 stop6h 40m

London Heathrow

Mon 12/1

06:00-13:50

1 stop6h 50m

£178

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Fri 3/4

15:00-21:40

1 stop7h 40m

London Heathrow

Sat 11/4

06:00-14:00

1 stop7h 00m

£180

KlagenfurtLondon

KLU - LHR

KLULHR

Klagenfurt

Sat 4/4

15:00-21:40

1 stop7h 40m

London Heathrow

Sat 11/4

06:00-14:00

1 stop7h 00m

£180

Flights are sorted by cheapest return flights first.

Deals found on 2/12

Showing 1-10 of 23 results
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Best time to book a flight from Klagenfurt to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Klagenfurt 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 Klagenfurt to London Heathrow Airport

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

Currently, March is the cheapest month in which you can book a flight from Klagenfurt to London Heathrow Airport (average of £136). Flying from Klagenfurt to London Heathrow Airport in November is currently the most expensive (average of £191). 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.

Related info for your journey

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

  • What airport do you fly from for flights from Klagenfurt to London Heathrow?

    Klagenfurt (KLU) is the airport you will fly out of if you book a flight from Klagenfurt to London Heathrow. You should not have trouble finding flights to London Heathrow from Klagenfurt; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Klagenfurt airport to London Heathrow. It is only a 2.0 mi journey to Klagenfurt (KLU) from Klagenfurt’s city center.

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

    A quick flight from Klagenfurt to London Heathrow Airport can take about 4h 25m. Austrian Airlines provides one of the quickest options available for as low as £174. Klagenfurt and London Heathrow Airport are separated by a distance of 745 mi.

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

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

  • How can I find direct flights from Klagenfurt to Heathrow?

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Klagenfurt to London Heathrow Airport (average of £136). Flying from Klagenfurt to London Heathrow Airport in November is currently the most expensive (average of £191). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Northampton
Hounslow
Slough
Gatwick
Luton
Ilford
Wembley
Colchester
Brentford
Watford
Hayes
Crawley
Deal
Winchester
Swindon
Romford
Bedford
Chichester

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Alternative routes for Klagenfurt to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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How does Cheapflights help users find flights from Klagenfurt to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Klagenfurt to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Klagenfurt to Heathrow for you. Better yet — we are completely free to use.

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

Yes! Cheapflights helps users easily find flights from Klagenfurt to Heathrow with no change fees.

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

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

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