What is the cheapest airline that flies from London Heathrow to Trieste Ronchi dei Legionari?

ITA Airways is the most popular carrier operating from London Heathrow to Trieste Ronchi dei Legionari

Which airlines fly to Trieste?

British Airways, Lufthansa and easyJet are the top three most popular airlines that fly to Trieste from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 93% of people opting to fly with this airline when travelling to Trieste. Keep in mind that there are 6 different airlines that fly to Trieste on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?

Prices for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport are updated daily.

How many operators does momondo search for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?

As of October 2026, there are 2 operators available to choose from for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport.

How old do you have to be to fly from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Trieste Ronchi dei Legionari Airport.

What documentation or ID do you need to fly to Trieste Ronchi dei Legionari Airport?

The required travel and health documents for your Trieste Ronchi dei Legionari Airport 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 Trieste Ronchi dei Legionari Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

£70 Cheap Flights from London Heathrow Airport to Trieste in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London Heathrow Airport to Trieste

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16:30 - 22:55LHR London Heathrow-TRS Trieste Ronchi dei Legionari

5h 25m1 stop Rome Fiumicino

11:15 - 15:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

5h 25m1 stop Rome Fiumicino

£128ITA Airways

Thu, 3 Dec - Thu, 10 Dec

09:55 - 19:40LHR London Heathrow-TRS Trieste Ronchi dei Legionari

8h 45m1 stop Barcelona-El Prat

08:55 - 21:35TRS Trieste Ronchi dei Legionari-LHR London Heathrow

13h 40m1 stop Barcelona-El Prat

£132Multiple Airlines

Sat, 28 Nov - Mon, 30 Nov

09:55 - 19:40LHR London Heathrow-TRS Trieste Ronchi dei Legionari

8h 45m1 stop Barcelona-El Prat

08:55 - 21:35TRS Trieste Ronchi dei Legionari-LHR London Heathrow

13h 40m1 stop Barcelona-El Prat

£132Multiple Airlines

Sat, 28 Nov - Mon, 30 Nov

09:55 - 19:40LHR London Heathrow-TRS Trieste Ronchi dei Legionari

8h 45m1 stop Barcelona-El Prat

10:45 - 19:50TRS Trieste Ronchi dei Legionari-LHR London Heathrow

10h 05m1 stop Dublin

£138Multiple Airlines

Sat, 14 Nov - Mon, 16 Nov

16:30 - 18:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

25h 00m1 stop Rome Fiumicino

15:15 - 15:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

25h 25m1 stop Rome Fiumicino

£139ITA Airways

Tue, 1 Dec - Tue, 8 Dec

10:30 - 18:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

7h 00m1 stop Rome Fiumicino

19:15 - 09:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

15h 25m1 stop Rome Fiumicino

£140ITA Airways

Sat, 14 Nov - Mon, 16 Nov

10:30 - 18:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

7h 00m1 stop Rome Fiumicino

19:15 - 09:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

15h 25m1 stop Rome Fiumicino

£142ITA Airways

Sat, 14 Nov - Mon, 16 Nov

08:30 - 13:45LHR London Heathrow-TRS Trieste Ronchi dei Legionari

4h 15m1 stop Frankfurt am Main

06:20 - 17:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

12h 20m1 stop Frankfurt am Main

£172Lufthansa

Sat, 10 Apr - Sun, 18 Apr

06:30 - 13:45LHR London Heathrow-TRS Trieste Ronchi dei Legionari

6h 15m1 stop Frankfurt am Main

14:30 - 18:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

5h 10m1 stop Frankfurt am Main

£172Lufthansa

Fri, 9 Apr - Sat, 17 Apr

13:30 - 22:25LHR London Heathrow-TRS Trieste Ronchi dei Legionari

7h 55m1 stop Frankfurt am Main

14:30 - 20:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

7h 10m1 stop Frankfurt am Main

£172Lufthansa

Fri, 9 Apr - Fri, 16 Apr

Cheap last-minute flights

Enter your travel dates to find the best prices.

09:55 - 20:00LHR London Heathrow-TRS Trieste Ronchi dei Legionari

9h 05m1 stop Barcelona-El Prat

06:00 - 15:15TRS Trieste Ronchi dei Legionari-LHR London Heathrow

10h 15m2 stops Krakow J. Paul II Balice Helsinki-Vantaa

£230Multiple Airlines

Wed, 28 Oct - Sun, 1 Nov

09:55 - 20:00LHR London Heathrow-TRS Trieste Ronchi dei Legionari

9h 05m1 stop Barcelona-El Prat

06:00 - 15:15TRS Trieste Ronchi dei Legionari-LHR London Heathrow

10h 15m2 stops Krakow J. Paul II Balice Helsinki-Vantaa

£231Multiple Airlines

Wed, 28 Oct - Sun, 1 Nov

09:55 - 20:00LHR London Heathrow-TRS Trieste Ronchi dei Legionari

9h 05m1 stop Barcelona-El Prat

06:00 - 15:15TRS Trieste Ronchi dei Legionari-LHR London Heathrow

10h 15m2 stops Krakow J. Paul II Balice Helsinki-Vantaa

£235Multiple Airlines

Wed, 28 Oct - Sun, 1 Nov

06:00 - 07:40LHR London Heathrow-TRS Trieste Ronchi dei Legionari

24h 40m2 stops Vienna Intl Tirana Rinas

21:50 - 08:20TRS Trieste Ronchi dei Legionari-LHR London Heathrow

35h 30m2 stops Tirana Rinas Vienna Intl

£317Multiple Airlines

Sun, 25 Oct - Sat, 31 Oct

10:30 - 18:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

7h 00m1 stop Rome Fiumicino

15:15 - 09:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

19h 25m1 stop Rome Fiumicino

£419ITA Airways

Fri, 23 Oct - Sun, 25 Oct

10:30 - 18:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

7h 00m1 stop Rome Fiumicino

15:15 - 09:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

19h 25m1 stop Rome Fiumicino

£450ITA Airways

Fri, 23 Oct - Sun, 25 Oct

16:30 - 14:30LHR London Heathrow-TRS Trieste Ronchi dei Legionari

21h 00m1 stop Rome Fiumicino

06:35 - 15:40TRS Trieste Ronchi dei Legionari-LHR London Heathrow

10h 05m1 stop Rome Fiumicino

£524ITA Airways

Wed, 28 Oct - Sun, 1 Nov

10:50 - 22:15LHR London Heathrow-TRS Trieste Ronchi dei Legionari

10h 25m2 stops Munich Franz Josef Strauss Frankfurt am Main

11:15 - 18:35TRS Trieste Ronchi dei Legionari-LHR London Heathrow

8h 20m2 stops Rome Fiumicino Munich Franz Josef Strauss

£678Lufthansa

Fri, 23 Oct - Sun, 25 Oct

07:30 - 13:55LHR London Heathrow-TRS Trieste Ronchi dei Legionari

5h 25m1 stop Frankfurt am Main

06:35 - 21:00TRS Trieste Ronchi dei Legionari-LHR London Heathrow

15h 25m2 stops Rome Fiumicino Munich Franz Josef Strauss

£781Lufthansa

Sat, 24 Oct - Sat, 31 Oct

07:30 - 13:55LHR London Heathrow-TRS Trieste Ronchi dei Legionari

5h 25m1 stop Frankfurt am Main

11:15 - 22:55TRS Trieste Ronchi dei Legionari-LHR London Heathrow

12h 40m2 stops Rome Fiumicino Munich Franz Josef Strauss

£917Lufthansa

Fri, 23 Oct - Fri, 30 Oct

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ITA Airways flights from London Heathrow Airport to Trieste

Our best ITA Airways deals on London Heathrow Airport to Trieste flight tickets

ITA Airways

3 Dec

LHR16:30London Heathrow

5h 25m

1 stop

TRS22:55Trieste Ronchi dei Legionari

10 Dec

TRS11:15Trieste Ronchi dei Legionari

5h 25m

1 stop

LHR15:40London Heathrow

£128

ITA Airways

1 Dec

LHR16:30London Heathrow

25h 00m

1 stop

TRS18:30Trieste Ronchi dei Legionari

8 Dec

TRS15:15Trieste Ronchi dei Legionari

25h 25m

1 stop

LHR15:40London Heathrow

£139

ITA Airways

14 Nov

LHR10:30London Heathrow

7h 00m

1 stop

TRS18:30Trieste Ronchi dei Legionari

16 Nov

TRS19:15Trieste Ronchi dei Legionari

15h 25m

1 stop

LHR09:40London Heathrow

£142

KLM flights from London Heathrow Airport to Trieste

Our best KLM deals on London Heathrow Airport to Trieste flight tickets

KLM

1 Nov

LHR20:25London Heathrow

17h 05m

2 stops

TRS14:30Trieste Ronchi dei Legionari

5 Nov

TRS06:35Trieste Ronchi dei Legionari

11h 25m

2 stops

LHR17:00London Heathrow

£433

KLM

23 Oct

LHR08:40London Heathrow

13h 15m

2 stops

TRS22:55Trieste Ronchi dei Legionari

26 Oct

TRS15:15Trieste Ronchi dei Legionari

6h 35m

2 stops

LHR20:50London Heathrow

£669

momondo Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Thu 3/12

16:30-22:55

1 stop5h 25m

Trieste Ronchi dei Legionari

Thu 10/12

11:15-15:40

1 stop5h 25m

£128

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 28/11

09:55-19:40

1 stop8h 45m

Trieste Ronchi dei Legionari

Mon 30/11

08:55-21:35

1 stop13h 40m

£132

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 28/11

09:55-19:40

1 stop8h 45m

Trieste Ronchi dei Legionari

Mon 30/11

08:55-21:35

1 stop13h 40m

£132

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 14/11

09:55-19:40

1 stop8h 45m

Trieste Ronchi dei Legionari

Mon 16/11

10:45-19:50

1 stop10h 05m

£138

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Tue 1/12

16:30-18:30

1 stop25h 00m

Trieste Ronchi dei Legionari

Tue 8/12

15:15-15:40

1 stop25h 25m

£139

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 14/11

10:30-18:30

1 stop7h 00m

Trieste Ronchi dei Legionari

Mon 16/11

19:15-09:40

1 stop15h 25m

£140

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 14/11

10:30-18:30

1 stop7h 00m

Trieste Ronchi dei Legionari

Mon 16/11

19:15-09:40

1 stop15h 25m

£142

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Sat 10/4

08:30-13:45

1 stop4h 15m

Trieste Ronchi dei Legionari

Sun 18/4

06:20-17:40

1 stop12h 20m

£172

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Fri 9/4

06:30-13:45

1 stop6h 15m

Trieste Ronchi dei Legionari

Sat 17/4

14:30-18:40

1 stop5h 10m

£172

LondonTrieste

LHR London Heathrow - TRS Trieste Ronchi dei Legionari

LHRTRS

London Heathrow

Fri 9/4

13:30-22:25

1 stop7h 55m

Trieste Ronchi dei Legionari

Fri 16/4

14:30-20:40

1 stop7h 10m

£172

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from London Heathrow Airport to Trieste

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

What is the cheapest day to depart on your flight to Trieste?

On average, the least expensive day to fly to Trieste from London Heathrow Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £82. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Trieste is Monday, with ticket prices averaging around £138.

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

The cheapest time of day to fly to Trieste is in the morning when flights can be purchased for as low as £65. Flights to Trieste are more costly at midday, with an average ticket price of £151. Departure times at midday fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from London Heathrow Airport to Trieste

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Trieste according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap London Heathrow Airport to Trieste (LHR to TRS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Trieste

Best price found	£70
Fastest flight time	5h 25m
Direct flights	None

The best one-way flight to Trieste from London Heathrow Airport in the past 72 hours is £70. The best return flight deal from London Heathrow Airport to Trieste found on momondo in the last 72 hours is £128.

The fastest flight from London Heathrow Airport to Trieste takes 5h 25m

There are no direct flights from London Heathrow Airport to Trieste. There are no popular flight routes from London Heathrow Airport to Trieste.

Search flight deals

Frequently asked questions about flying from London Heathrow Airport to Trieste

How far is London Heathrow to Trieste Ronchi dei Legionari by plane?
The distance between London Heathrow and Trieste Ronchi dei Legionari is about 762.4 mi. Flights usually cover this in 5h 25m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?
Prices for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport are updated daily.
How many operators does momondo search for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?
As of October 2026, there are 2 operators available to choose from for flights from London Heathrow Airport to Trieste Ronchi dei Legionari Airport.
How old do you have to be to fly from London Heathrow Airport to Trieste Ronchi dei Legionari Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Trieste Ronchi dei Legionari Airport.
What documentation or ID do you need to fly to Trieste Ronchi dei Legionari Airport?
The required travel and health documents for your Trieste Ronchi dei Legionari Airport 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 Trieste Ronchi dei Legionari Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from London Heathrow Airport to Trieste?
momondo data reveals that the most frequently booked airline on the route from London Heathrow Airport to Trieste is Lufthansa, representing 54% of all bookings. The subsequent popular airline is ITA Airways at 46%.

Best airlines flying from London Heathrow Airport to Trieste

Compare and see reviews for airlines that fly from London Heathrow Airport to Trieste with momondo

Airline	Rating	Free Cancellation	Price
ITA Airways	PriceFrom £77	Free Cancellation	Rating 6.8 1,399 reviews		Search ITA Airways flights
Lufthansa	PriceFrom £168	Free Cancellation	Rating 6.8 8,285 reviews		Search Lufthansa flights

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Why use momondo?

Why should I use momondo to find a flight deal from London to Trieste?

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 Trieste from London.

Can I find flights from London to Trieste with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Trieste from London with this policy.

How can momondo help me find flights from London to Trieste?

Once you have performed a search for London to Trieste flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from London to Trieste now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Trieste and let you know when they change.

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ITA Airways flights from London Heathrow Airport to Trieste

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How to get the cheapest flight ticket from London Heathrow Airport to Trieste

What is the cheapest day to depart on your flight to Trieste?

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

What is the cheapest airline that flies from London Heathrow to Trieste Ronchi dei Legionari?

Which airlines fly to Trieste?

When to book flights from London Heathrow Airport to Trieste

Cheap London Heathrow Airport to Trieste (LHR to TRS) flight deals and tips

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Frequently asked questions about flying from London Heathrow Airport to Trieste

Best airlines flying from London Heathrow Airport to Trieste

Compare and see reviews for airlines that fly from London Heathrow Airport to Trieste with momondo

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Why use momondo?

An easier way to manage your Trieste trip

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