How long is the flight from London Heathrow Airport to Saint Lucia?

Icelandair and JetBlue can get you from London Heathrow Airport to Saint Lucia in just under 35h 36m. Your travel time can differ by up to 14m. The distance between London Heathrow Airport and Saint Lucia is about 4217 mi. Both multi-stop and direct flights can be found to your destination and back.

What are the most popular airlines that fly from London Heathrow Airport to Saint Lucia?

Before booking your flight from London Heathrow Airport to Saint Lucia check out the most popular airlines for this route: British Airways, Virgin Atlantic or Finnair.

Can I find deals for flights from Heathrow to Saint Lucia that include hotel bookings?

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

How can I find direct flights from Heathrow to Saint Lucia?

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

Can I find deals for business class flights from Heathrow to Saint Lucia?

Yes. Cheapflights offers flight deals from Heathrow to Saint Lucia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£373+ Cheap Flights from London Heathrow Airport to Saint Lucia

Cheap flight deals from Heathrow to Saint Lucia

Round-trip from	£547
One-way from	£373
Popular in	April
Cheapest in	November
Average price	£518

Icelandair
21/1-28/1
2 total stops
55h 55m total
London to Saint Lucia

Search Deals

JetBlue
27/11
1 total stop
36h 16m total
London to Saint Lucia

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£105 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 11% potential price decrease (£55 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

Find flight deals from Heathrow to Saint Lucia

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Saint Lucia
Explore the most affordable flight options available from Heathrow to Saint Lucia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.

Mon 10/1108:05LHR - UVF

1 stop34h 52mIcelandair

Mon 24/1117:01UVF - LHR

1 stop24h 39mIcelandair

Deal found 10/10£552

Mon 17/1108:05LHR - UVF

1 stop34h 52mJetBlue

Sun 23/1117:01UVF - LHR

1 stop23h 44mJetBlue

Deal found 10/10£571

Sat 15/1108:05LHR - UVF

1 stop34h 52mIcelandair

Thu 27/1117:01UVF - LHR

1 stop23h 44mIcelandair

Deal found 10/10£603

Sat 8/1108:05LHR - UVF

1 stop35h 36mIcelandair

Sat 15/1113:56UVF - LHR

1 stop26h 49mIcelandair

Deal found 9/10£606

Mon 10/1108:00LHR - SLU

1 stop13h 30mMultiple Airlines

Thu 13/1115:20SLU - LHR

1 stop14h 35mMultiple Airlines

Deal found 9/10£617

Fri 21/1108:05LHR - UVF

1 stop34h 52mIcelandair

Tue 24/315:54UVF - LHR

1 stop24h 51mIcelandair

Deal found 10/10£621

Thu 13/1107:25LHR - UVF

1 stop35h 32mIcelandair

Fri 12/1216:57UVF - LHR

1 stop25h 03mIcelandair

Deal found 10/10£626

Thu 13/1107:25LHR - UVF

1 stop35h 32mIcelandair

Thu 11/1216:57UVF - LHR

1 stop23h 48mIcelandair

Deal found 9/10£636

Thu 30/1008:00LHR - SLU

1 stop33h 10mMultiple Airlines

Sun 9/1112:10SLU - LHR

1 stop17h 45mMultiple Airlines

Deal found 10/10£689

Sun 2/1113:20LHR - SLU

1 stop26h 45mMultiple Airlines

Wed 5/1115:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/10£742

Thu 13/1108:00LHR - SLU

1 stop33h 10mMultiple Airlines

Thu 11/1215:20SLU - LHR

1 stop14h 15mMultiple Airlines

Deal found 9/10£761

Wed 5/1113:25LHR - SLU

1 stop33h 35mMultiple Airlines

Sun 9/1115:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/10£764

Best flights from Heathrow to Saint Lucia
Discover carefully curated flight deals from Heathrow to Saint Lucia that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 10 October 2025.

Wed 21/107:25LHR - UVF

1 stop35h 50mIcelandair

Wed 28/116:40UVF - LHR

2 stops34h 15mIcelandair

Deal found 9/10£547

Sat 22/1108:05LHR - UVF

1 stop35h 36mJetBlue

Fri 28/1117:01UVF - LHR

1 stop24h 59mJetBlue

Deal found 10/10£637

Sun 23/1108:30LHR - UVF

2 stops35h 55mMultiple Airlines

Sun 30/1117:15UVF - LHR

1 stop33h 15mMultiple Airlines

Deal found 9/10£644

Sun 16/1116:50LHR - UVF

2 stops26h 49mDelta

Wed 19/1116:59UVF - LHR

2 stops33h 21mDelta

Deal found 8/10£713

Mon 23/319:10LHR - UVF

2 stops22h 20mAmerican Airlines

Tue 14/415:35UVF - LHR

2 stops23h 10mAmerican Airlines

Deal found 10/10£716

Mon 10/1108:05LHR - UVF

1 stop34h 52mIcelandair

Mon 24/1117:01UVF - LHR

1 stop24h 39mIcelandair

Deal found 9/10£576

Thu 5/209:40LHR - UVF

2 stops33h 24mDelta

Thu 12/216:24UVF - LHR

2 stops23h 46mDelta

Deal found 10/10£716

Thu 13/1112:20LHR - UVF

2 stops54h 02mIcelandair

Fri 12/1216:57UVF - LHR

1 stop25h 03mIcelandair

Deal found 10/10£653

Mon 24/1108:00LHR - SLU

1 stop13h 30mMultiple Airlines

Thu 27/1115:20SLU - LHR

1 stop14h 35mMultiple Airlines

Deal found 8/10£727

Mon 23/316:10LHR - UVF

2 stops25h 54mDelta

Mon 6/415:24UVF - LHR

1 stop17h 06mDelta

Deal found 10/10£716

Sat 7/214:30LHR - SLU

1 stop24h 55mMultiple Airlines

Sun 15/212:10SLU - LHR

1 stop17h 45mMultiple Airlines

Deal found 8/10£748

Sat 1/1109:40LHR - SLU

1 stop29h 45mMultiple Airlines

Sun 30/1112:10SLU - LHR

1 stop13h 15mMultiple Airlines

Deal found 10/10£788

Fri 31/1009:40LHR - SLU

2 stops31h 30mMultiple Airlines

Sun 9/1112:10SLU - LHR

1 stop17h 45mMultiple Airlines

Deal found 9/10£893

Thu 27/1113:25LHR - SLU

1 stop26h 40mMultiple Airlines

Thu 4/1215:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 9/10£912

Sat 1/1108:00LHR - SLU

2 stops35h 15mMultiple Airlines

Sat 15/1118:20SLU - LHR

3 stops35h 35mMultiple Airlines

Deal found 8/10£921

Thu 20/1109:40LHR - SLU

1 stop13h 20mMultiple Airlines

Sun 23/1119:10SLU - LHR

2 stops34h 45mMultiple Airlines

Deal found 8/10£1,008

Sun 16/1120:00LHR - SLU

2 stops23h 35mMultiple Airlines

Sun 30/1105:00SLU - LHR

2 stops35h 10mMultiple Airlines

Deal found 8/10£1,010

Thu 13/1108:00LHR - SLU

1 stop15h 00mMultiple Airlines

Thu 11/1218:20SLU - LHR

2 stops21h 50mMultiple Airlines

Deal found 8/10£1,018

Sun 16/1116:35LHR - SLU

2 stops27h 00mMultiple Airlines

Mon 1/1216:20SLU - LHR

2 stops23h 50mMultiple Airlines

Deal found 8/10£1,070

Last-minute flights from Heathrow to Saint Lucia
Discover last-minute flight deals from Heathrow to Saint Lucia. Data last updated 10 October 2025 and is based on user searches.

Wed 15/1010:05LHR - UVF

2 stops32h 51mBritish Airways

Wed 22/1014:56UVF - LHR

2 stops39h 09mBritish Airways

Deal found 10/10£856

Wed 15/1015:00LHR - UVF

1 stop27h 40mAmerican Airlines

Wed 22/1014:56UVF - LHR

1 stop14h 39mAmerican Airlines

Deal found 10/10£858

Wed 29/1013:25LHR - SLU

1 stop29h 50mMultiple Airlines

Fri 7/1112:35SLU - LHR

1 stop13h 15mMultiple Airlines

Deal found 10/10£782

Thu 30/1008:00LHR - SLU

1 stop33h 10mMultiple Airlines

Sun 9/1112:10SLU - LHR

1 stop17h 45mMultiple Airlines

Deal found 10/10£689

Sat 1/1109:40LHR - SLU

1 stop29h 45mMultiple Airlines

Sun 30/1112:10SLU - LHR

1 stop13h 15mMultiple Airlines

Deal found 10/10£788

Sun 2/1113:20LHR - SLU

1 stop26h 45mMultiple Airlines

Wed 5/1115:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/10£742

Wed 5/1113:25LHR - SLU

1 stop33h 35mMultiple Airlines

Sun 9/1115:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/10£764

Mon 10/1108:00LHR - SLU

1 stop13h 30mMultiple Airlines

Thu 13/1115:20SLU - LHR

1 stop14h 35mMultiple Airlines

Deal found 9/10£617

Thu 13/1108:00LHR - SLU

1 stop33h 10mMultiple Airlines

Thu 11/1215:20SLU - LHR

1 stop14h 15mMultiple Airlines

Deal found 9/10£761

Thu 20/1109:40LHR - SLU

1 stop31h 30mMultiple Airlines

Sun 30/1112:10SLU - LHR

1 stop13h 15mMultiple Airlines

Deal found 10/10£778

Sat 22/1108:00LHR - SLU

1 stop31h 25mMultiple Airlines

Fri 28/1113:55SLU - LHR

1 stop11h 30mMultiple Airlines

Deal found 10/10£771

Tue 25/1110:35LHR - SLU

1 stop12h 25mMultiple Airlines

Thu 27/1112:35SLU - LHR

1 stop13h 15mMultiple Airlines

Deal found 9/10£824

One-way flights from Heathrow to Saint Lucia
Search for one-way flight options from Heathrow to Saint Lucia. Find affordable one-way fares based on user searches. Data last updated 10 October 2025.

Thu 27/1107:25LHR - UVF

1 stop36h 16mJetBlue

Deal found 9/10£373

Thu 6/1107:25LHR - UVF

1 stop35h 32mJetBlue

Deal found 9/10£407

Wed 4/307:25LHR - UVF

1 stop36h 09mJetBlue

Deal found 9/10£412

Sat 8/1108:05LHR - UVF

1 stop35h 36mJetBlue

Deal found 9/10£428

Fri 7/1109:20LHR - UVF

1 stop33h 02mJetBlue

Deal found 9/10£437

Wed 4/309:50LHR - UVF

2 stops32h 56mMultiple Airlines

Deal found 9/10£442

Mon 10/1108:05LHR - UVF

1 stop34h 52mJetBlue

Deal found 9/10£457

Wed 4/314:50LHR - UVF

3 stops27h 56mWestJet

Deal found 9/10£458

Thu 13/1115:15LHR - SLU

2 stops31h 10mMultiple Airlines

Deal found 9/10£466

Thu 13/1112:20LHR - UVF

1 stop30h 37mJetBlue

Deal found 9/10£478

Thu 27/1112:25LHR - SLU

3 stops30h 50mMultiple Airlines

Deal found 9/10£480

Tue 28/1014:50LHR - UVF

2 stops51h 00mWestJet

Deal found 10/10£482

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Wed 21/1

07:25-15:15

1 stop35h 50m

Castries Hewanorra

Wed 28/1

16:40-06:55

2 stops34h 15m

£547

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Mon 10/11

08:05-14:57

1 stop34h 52m

Castries Hewanorra

Mon 24/11

17:01-21:40

1 stop24h 39m

£576

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Sat 22/11

08:05-15:41

1 stop35h 36m

Castries Hewanorra

Fri 28/11

17:01-22:00

1 stop24h 59m

£637

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Sun 23/11

08:30-16:25

2 stops35h 55m

Castries Hewanorra

Sun 30/11

17:15-06:30

1 stop33h 15m

£644

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Thu 13/11

12:20-14:22

2 stops54h 02m

Castries Hewanorra

Fri 12/12

16:57-22:00

1 stop25h 03m

£653

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Sun 16/11

16:50-15:39

2 stops26h 49m

Castries Hewanorra

Wed 19/11

16:59-06:20

2 stops33h 21m

£713

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Mon 23/3

19:10-13:30

2 stops22h 20m

Castries Hewanorra

Tue 14/4

15:35-19:45

2 stops23h 10m

£716

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Thu 5/2

09:40-15:04

2 stops33h 24m

Castries Hewanorra

Thu 12/2

16:24-20:10

2 stops23h 46m

£716

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Mon 23/3

16:10-14:04

2 stops25h 54m

Castries Hewanorra

Mon 6/4

15:24-13:30

1 stop17h 06m

£716

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Mon 24/11

08:00-17:30

1 stop13h 30m

Castries George F. L. Charle

Thu 27/11

15:20-09:55

1 stop14h 35m

£727

Flights are sorted by cheapest return flights first.

Deals found on 9/10

Showing 1-10 of 39 results

Best time to book a flight from Heathrow to Saint Lucia

Have a flexible travel schedule? Discover the best time to fly to Saint Lucia 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 Saint Lucia

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

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Saint Lucia (average of £382). Flying from London Heathrow Airport to Saint Lucia in July is currently the most expensive (average of £665). 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 LC?

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Saint Lucia in the morning. If you’re flexible enough to do this you can expect to save up to 50% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Saint Lucia

Read reviews from past customers who have flown with KLM, Finnair, andVirgin Atlantic from London Heathrow Airport to Saint Lucia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

KLM

7.7

Good

1,399 reviews

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Finnair

7.6

Good

1,332 reviews

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Virgin Atlantic

7.4

Good

665 reviews

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Air Canada

7.1

Good

10,263 reviews

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

British Airways

6.7

Okay

7,446 reviews

KLM

7.7

Good

1,399 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

How long is the flight from London Heathrow Airport to Saint Lucia?
Icelandair and JetBlue can get you from London Heathrow Airport to Saint Lucia in just under 35h 36m. Your travel time can differ by up to 14m. The distance between London Heathrow Airport and Saint Lucia is about 4217 mi. Both multi-stop and direct flights can be found to your destination and back.
Can I find deals for flights from Heathrow to Saint Lucia that include hotel bookings?
Yes. In addition to deals on Heathrow to Saint Lucia flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Saint Lucia?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Saint Lucia.
Can I find deals for business class flights from Heathrow to Saint Lucia?
Yes. Cheapflights offers flight deals from Heathrow to Saint Lucia 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 Saint Lucia?
Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Saint Lucia (average of £382). Flying from London Heathrow Airport to Saint Lucia in July is currently the most expensive (average of £665). 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

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Direct flights to

Direct flights to Montego Bay

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Direct flights to Kingston

Direct flights to Punta Cana

Direct flights to Port of Spain

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Direct flights to St. George's

Direct flights to Kingstown

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Direct flights to Scarborough

Top 5 airlines flying from Heathrow to Saint Lucia

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£429	Average£604	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£432	Average£597	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air Canada	Cheapest£522	Average£671	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Finnair	Cheapest£648	Average£839	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£688	Average£1,331	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to Saint Lucia?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Saint Lucia. 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 Heathrow to Saint Lucia?

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

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

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

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

Yes! Start tracking prices for Heathrow to Saint Lucia flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from London Heathrow Airport to Saint Lucia from £373

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 27/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to Saint Lucia

Keep the following information in mind while searching for Heathrow to Saint Lucia flight deals. Data was last updated 10 October 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Heathrow to Saint Lucia

Cheapest flights from Heathrow to Saint LuciaExplore the most affordable flight options available from Heathrow to Saint Lucia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.

Explore the most affordable flight options available from Heathrow to Saint Lucia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Heathrow to Saint Lucia

Have a flexible travel schedule? Discover the best time to fly to Saint Lucia from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Saint Lucia

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

What is the cheapest time of day to fly from LHR to LC?

Find hourly flight availability from Heathrow to Saint Lucia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 10 October 2025.

Reviews of airlines servicing Saint Lucia

Read reviews from past customers who have flown with KLM, Finnair, andVirgin Atlantic from London Heathrow Airport to Saint Lucia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Saint Lucia. 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 Saint Lucia?

Can I find deals for flights from Heathrow to Saint Lucia that include hotel bookings?

How can I find direct flights from Heathrow to Saint Lucia?

Can I find deals for business class flights from Heathrow to Saint Lucia?

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

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.

Alternative routes for Heathrow to Saint Lucia

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

Top 5 airlines flying from Heathrow to Saint Lucia

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 Saint Lucia?

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

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

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

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Cheapest flights from Heathrow to Saint Lucia
Explore the most affordable flight options available from Heathrow to Saint Lucia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 October 2025.