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

American Airlines and Delta can get you from London Heathrow Airport to Saint Lucia in just under 21h 24m. Your travel time can differ by up to 5h 28m. 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 is the cheapest day to fly from London Heathrow Airport to Saint Lucia?

Travellers seeking maximum savings on their London Heathrow Airport to Saint Lucia flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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: Air Canada, Finnair or British Airways.

What is the cheapest day to fly round-trip from London Heathrow Airport to Saint Lucia?

Flying to your destination on a Friday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Saint Lucia. Check prices with Cheapflights to find a great deal for your trip.

What is the cheapest month to fly from London Heathrow Airport to Saint Lucia?

Our data shows that September tends to be the cheapest month to fly to Saint Lucia from London Heathrow Airport. Users have commonly found prices around £601 for the month, but tickets can be as low as £404. Due to multiple factors, prepare for potentially higher prices in December.

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.

£394+ Cheap Flights from London Heathrow Airport to Saint Lucia

Cheap flight deals from Heathrow to Saint Lucia

Round-trip from	£579
One-way from	£394
Popular in	December
Cheapest in	September
Average price	£475

JetBlue
10/11-24/11
2 total stops
59h 31m total
London to Saint Lucia

Search Deals

1/12
1 total stop
25h 45m total
London to Saint Lucia

Search Deals

Highest demand for flights based on searches. 11% potential increase in price (£58 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease (£26 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Heathrow to Saint Lucia

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 12 September 2025.

Mon 10/1108:05LHR - UVF

1 stop34h 52mJetBlue

Mon 24/1117:01UVF - LHR

1 stop24h 39mJetBlue

Deal found 10/9£579

Mon 10/1108:05LHR - UVF

1 stop34h 52mIcelandair

Mon 24/1117:01UVF - LHR

1 stop24h 39mIcelandair

Deal found 10/9£587

Thu 9/1008:15LHR - UVF

1 stop34h 59mJetBlue

Thu 16/1015:34UVF - LHR

1 stop24h 11mJetBlue

Deal found 11/9£644

Thu 25/908:05LHR - SLU

1 stop11h 30mMultiple Airlines

Thu 9/1015:20SLU - LHR

1 stop11h 30mMultiple Airlines

Deal found 10/9£674

Thu 23/1008:05LHR - SLU

1 stop11h 30mMultiple Airlines

Thu 6/1115:20SLU - LHR

1 stop14h 35mMultiple Airlines

Deal found 10/9£676

Thu 9/1008:25LHR - UVF

2 stops34h 49mIcelandair

Thu 16/1015:34UVF - LHR

1 stop24h 11mIcelandair

Deal found 11/9£679

Fri 26/908:25LHR - UVF

2 stops33h 21mIcelandair

Fri 10/1015:19UVF - LHR

1 stop24h 26mIcelandair

Deal found 10/9£681

Sat 11/1008:15LHR - UVF

1 stop34h 59mJetBlue

Thu 23/1015:34UVF - LHR

1 stop24h 11mJetBlue

Deal found 10/9£684

Thu 16/1008:30LHR - UVF

1 stop34h 45mAir Canada

Tue 21/1015:10UVF - LHR

1 stop34h 25mAir Canada

Deal found 11/9£687

Sat 11/1008:25LHR - UVF

2 stops58h 55mIcelandair

Thu 23/1015:34UVF - LHR

1 stop24h 11mIcelandair

Deal found 10/9£688

Sat 27/908:05LHR - SLU

1 stop32h 20mMultiple Airlines

Thu 9/1015:20SLU - LHR

1 stop11h 30mMultiple Airlines

Deal found 11/9£706

Fri 10/1009:35LHR - SLU

2 stops32h 35mMultiple Airlines

Fri 17/1012:15SLU - LHR

2 stops26h 45mMultiple Airlines

Deal found 10/9£759

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 12 September 2025.

Thu 23/1008:05LHR - SLU

1 stop11h 30mMultiple Airlines

Thu 6/1115:20SLU - LHR

1 stop14h 35mMultiple Airlines

Deal found 10/9£676

Fri 16/119:05LHR - UVF

1 stop21h 24mAmerican Airlines

Sun 1/315:35UVF - LHR

1 stop15h 55mAmerican Airlines

Deal found 11/9£706

Wed 31/1216:35LHR - UVF

2 stops26h 52mDelta

Wed 1/415:24UVF - LHR

1 stop17h 06mDelta

Deal found 11/9£706

Sat 27/908:05LHR - SLU

1 stop32h 20mMultiple Airlines

Thu 9/1015:20SLU - LHR

1 stop11h 30mMultiple Airlines

Deal found 11/9£706

Sun 18/111:45LHR - UVF

1 stop30h 40mAmerican Airlines

Wed 25/216:45UVF - LHR

1 stop14h 45mAmerican Airlines

Deal found 11/9£706

Fri 17/1016:05LHR - UVF

2 stops27h 16mDelta

Wed 22/1015:41UVF - LHR

1 stop16h 49mDelta

Deal found 11/9£706

Thu 9/1012:55LHR - UVF

2 stops30h 31mDelta

Thu 16/1015:41UVF - LHR

2 stops23h 19mDelta

Deal found 11/9£706

Mon 27/1017:00LHR - UVF

2 stops24h 56mAmerican Airlines

Mon 3/1116:52UVF - LHR

1 stop33h 58mAmerican Airlines

Deal found 11/9£707

Sat 7/213:25LHR - SLU

1 stop26h 40mMultiple Airlines

Wed 18/215:45SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/9£736

Thu 25/916:50LHR - UVF

2 stops26h 33mDelta

Wed 8/1015:41UVF - LHR

2 stops33h 44mDelta

Deal found 10/9£707

Fri 6/319:25LHR - SLU

2 stops44h 00mMultiple Airlines

Fri 20/313:55SLU - LHR

1 stop11h 30mMultiple Airlines

Deal found 11/9£738

Wed 24/920:25LHR - UVF

2 stops46h 58mDelta

Wed 8/1015:41UVF - LHR

1 stop16h 49mDelta

Deal found 10/9£707

Last-minute flights from Heathrow to Saint Lucia
Discover last-minute flight deals from Heathrow to Saint Lucia. Data last updated 12 September 2025 and is based on user searches.

Wed 17/908:05LHR - SLU

3 stops34h 05mMultiple Airlines

Wed 24/910:15SLU - LHR

2 stops16h 35mMultiple Airlines

Deal found 10/9£805

Wed 17/911:25LHR - SLU

1 stop32h 50mMultiple Airlines

Wed 1/1012:35SLU - LHR

1 stop12h 45mMultiple Airlines

Deal found 10/9£832

Fri 26/908:25LHR - UVF

2 stops33h 21mIcelandair

Fri 10/1015:19UVF - LHR

1 stop24h 26mIcelandair

Deal found 10/9£681

Fri 26/908:15LHR - UVF

1 stop33h 31mJetBlue

Fri 10/1015:19UVF - LHR

1 stop24h 26mJetBlue

Deal found 10/9£698

Sat 27/908:15LHR - UVF

1 stop35h 00mJetBlue

Thu 9/1015:34UVF - LHR

1 stop24h 11mJetBlue

Deal found 11/9£697

Thu 9/1008:15LHR - UVF

1 stop34h 59mJetBlue

Thu 16/1015:34UVF - LHR

1 stop24h 11mJetBlue

Deal found 11/9£644

Thu 9/1008:25LHR - UVF

2 stops34h 49mIcelandair

Thu 16/1015:34UVF - LHR

1 stop24h 11mIcelandair

Deal found 11/9£679

Thu 9/1012:55LHR - UVF

2 stops30h 31mDelta

Thu 16/1015:41UVF - LHR

2 stops23h 19mDelta

Deal found 11/9£706

Sat 11/1008:15LHR - UVF

1 stop34h 59mJetBlue

Thu 23/1015:34UVF - LHR

1 stop24h 11mJetBlue

Deal found 10/9£684

Sat 11/1008:25LHR - UVF

2 stops58h 55mIcelandair

Thu 23/1015:34UVF - LHR

1 stop24h 11mIcelandair

Deal found 10/9£688

Thu 16/1008:30LHR - UVF

1 stop34h 45mAir Canada

Tue 21/1015:10UVF - LHR

1 stop34h 25mAir Canada

Deal found 11/9£687

Sun 26/1014:30LHR - UVF

1 stop27h 26mAmerican Airlines

Tue 4/1116:52UVF - LHR

2 stops36h 38mAmerican Airlines

Deal found 11/9£705

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 12 September 2025.

Mon 1/1217:05LHR - UVF

1 stop25h 45mMultiple Airlines

Deal found 11/9£394

Mon 1/1220:00LHR - SLU

2 stops41h 30mMultiple Airlines

Deal found 11/9£464

Fri 28/1111:40LHR - UVF

2 stops32h 45mMultiple Airlines

Deal found 11/9£485

Sat 6/1217:05LHR - UVF

1 stop25h 45mMultiple Airlines

Deal found 11/9£496

Sat 6/1212:10LHR - SLU

3 stops27h 35mMultiple Airlines

Deal found 11/9£513

Mon 22/908:05LHR - SLU

1 stop14h 25mMultiple Airlines

Deal found 10/9£514

Sun 21/913:45LHR - SLU

3 stops31h 05mMultiple Airlines

Deal found 10/9£517

Thu 25/906:00LHR - SLU

3 stops34h 30mMultiple Airlines

Deal found 10/9£520

Fri 28/1120:00LHR - SLU

3 stops30h 10mMultiple Airlines

Deal found 11/9£526

Mon 22/906:50LHR - UVF

2 stops36h 25mAir Canada

Deal found 10/9£530

Sat 6/1214:50LHR - UVF

3 stops28h 00mWestJet

Deal found 11/9£589

Thu 25/916:40LHR - UVF

2 stops49h 51mUnited Airlines

Deal found 10/9£616

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 - SLU

LHRSLU

London Heathrow

Thu 23/10

08:05-14:35

1 stop11h 30m

Castries George F. L. Charle

Thu 6/11

15:20-09:55

1 stop14h 35m

£676

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Fri 16/1

19:05-12:29

1 stop21h 24m

Castries Hewanorra

Sun 1/3

15:35-11:30

1 stop15h 55m

£706

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Wed 31/12

16:35-15:27

2 stops26h 52m

Castries Hewanorra

Wed 1/4

15:24-13:30

1 stop17h 06m

£706

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 27/9

08:05-11:25

1 stop32h 20m

Castries George F. L. Charle

Thu 9/10

15:20-07:50

1 stop11h 30m

£706

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Sun 18/1

11:45-14:25

1 stop30h 40m

Castries Hewanorra

Wed 25/2

16:45-11:30

1 stop14h 45m

£706

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Fri 17/10

16:05-14:21

2 stops27h 16m

Castries Hewanorra

Wed 22/10

15:41-13:30

1 stop16h 49m

£706

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Thu 9/10

12:55-14:26

2 stops30h 31m

Castries Hewanorra

Thu 16/10

15:41-20:00

2 stops23h 19m

£706

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Mon 27/10

17:00-13:56

2 stops24h 56m

Castries Hewanorra

Mon 3/11

16:52-06:50

1 stop33h 58m

£707

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Thu 25/9

16:50-14:23

2 stops26h 33m

Castries Hewanorra

Wed 8/10

15:41-06:25

2 stops33h 44m

£707

LondonCastries

LHR - UVF

LHRUVF

London Heathrow

Wed 24/9

20:25-14:23

2 stops46h 58m

Castries Hewanorra

Wed 8/10

15:41-13:30

1 stop16h 49m

£707

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 30 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 £328). Flying from London Heathrow Airport to Saint Lucia in December is currently the most expensive (average of £1,100). 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 at midday. If you’re flexible enough to do this you can expect to save up to 2% on your trip compared to booking a flight in the morning.

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

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

KLM

7.8

Good

1,385 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Finnair

7.6

Good

1,323 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Virgin Atlantic

7.4

Good

664 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Air Canada

7.1

Good

10,000 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

British Airways

6.7

Okay

7,361 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Related info for your journey

How long is the flight from London Heathrow Airport to Saint Lucia?
American Airlines and Delta can get you from London Heathrow Airport to Saint Lucia in just under 21h 24m. Your travel time can differ by up to 5h 28m. 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 £328). Flying from London Heathrow Airport to Saint Lucia in December is currently the most expensive (average of £1,100). 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

Alternative routes for Heathrow to Saint Lucia

Heathrow to Bridgetown flights

Heathrow to Montego Bay flights

Heathrow to Kingston flights

Gatwick to Bridgetown flights

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Heathrow to George Town flights

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Stansted to Punta Cana flights

London City to Castries flights

Heathrow to Castries flights

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Luton to Punta Cana flights

Gatwick to Havana flights

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Gatwick to Roseau flights

Heathrow to Basseterre flights

Stansted to Montego Bay flights

Stansted to Santo Domingo flights

London City to St. John's flights

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Gatwick to Road Town flights

Heathrow to Providenciales flights

Luton to Montego Bay flights

Gatwick to George Town flights

Heathrow to Havana flights

Direct flights to

Direct flights to Montego Bay

Direct flights to Bridgetown

Direct flights to Kingston

Direct flights to Punta Cana

Direct flights to Port of Spain

Direct flights to St. John's

Direct flights to St. George's

Direct flights to Kingstown

Direct flights to Nassau

Direct flights to Castries

Direct flights to George Town

Direct flights to Providenciales

Direct flights to Oranjestad

Direct flights to Basseterre

Direct flights to Scarborough

Top 5 airlines flying from Heathrow to Saint Lucia

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£414	Average£597	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£422	Average£596	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air Canada	Cheapest£514	Average£638	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Finnair	Cheapest£637	Average£816	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£676	Average£1,309	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 £394

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 1/12. 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 12 September 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 12 September 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 12 September 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 12 September 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 12 September 2025.