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Cheap flights from London Heathrow Airport to Castries from £552

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 28/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
4 Mar — 11 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Castries

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Castries
Explore the most affordable flight options available from Heathrow to Castries. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 February 2026.

Tue 3/213:20
LHR
-
SLU
1 stop26h 45m
Multiple Airlines
Tue 10/215:45
SLU
-
LHR
1 stop13h 50m
Multiple Airlines
Deal found 1/2£662
Tue 3/309:40
LHR
-
SLU
1 stop12h 45m
Multiple Airlines
Tue 10/316:20
SLU
-
LHR
1 stop13h 15m
Multiple Airlines
Deal found 1/2£674
Mon 2/313:20
LHR
-
SLU
1 stop33h 05m
Multiple Airlines
Mon 16/316:20
SLU
-
LHR
1 stop13h 15m
Multiple Airlines
Deal found 31/1£678
Tue 10/309:40
LHR
-
SLU
1 stop12h 45m
Multiple Airlines
Sun 15/312:35
SLU
-
LHR
1 stop12h 50m
Multiple Airlines
Deal found 31/1£686
Wed 25/209:40
LHR
-
SLU
1 stop13h 20m
Multiple Airlines
Wed 11/312:35
SLU
-
LHR
1 stop12h 50m
Multiple Airlines
Deal found 1/2£701
Tue 24/209:40
LHR
-
SLU
1 stop12h 45m
Multiple Airlines
Wed 11/312:35
SLU
-
LHR
1 stop12h 50m
Multiple Airlines
Deal found 31/1£707
Mon 2/213:20
LHR
-
SLU
1 stop33h 05m
Multiple Airlines
Mon 16/216:20
SLU
-
LHR
1 stop13h 15m
Multiple Airlines
Deal found 31/1£712
Fri 20/1109:40
LHR
-
SLU
1 stop13h 20m
Multiple Airlines
Fri 27/1115:45
SLU
-
LHR
1 stop14h 10m
Multiple Airlines
Deal found 31/1£717
Mon 2/313:20
LHR
-
SLU
1 stop33h 05m
Multiple Airlines
Mon 9/316:20
SLU
-
LHR
1 stop13h 35m
Multiple Airlines
Deal found 2/2£719
Fri 6/308:00
LHR
-
SLU
1 stop15h 00m
Multiple Airlines
Sun 15/312:35
SLU
-
LHR
1 stop12h 50m
Multiple Airlines
Deal found 2/2£735

Find flight deals from Heathrow to Castries

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Castries (SLU). 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 2 February 2026.

Round-trip from

£674

One-way from

£552

Popular in

April

Cheapest in

November

Average price

£694
3/3-10/3
  • 3/3-10/3
  • 2 total stops
  • 26h 00m total
  • London to Castries
Search Deals
28/4
  • 28/4
  • 1 total stop
  • 14h 05m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£184 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 17% potential price decrease (£83 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Castries 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 2 February 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Castries that are best for you.

Fly from

Heathrow

Fly to

Castries

Route

Depart

Return

Price

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 3/3

09:40-18:25

1 stop12h 45m

Castries George F. L. Charle

Tue 10/3

16:20-09:35

1 stop13h 15m

£674

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 10/3

09:40-18:25

1 stop12h 45m

Castries George F. L. Charle

Sun 15/3

12:35-05:25

1 stop12h 50m

£686

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 25/2

08:00-19:00

1 stop15h 00m

Castries George F. L. Charle

Wed 11/3

12:35-05:25

1 stop12h 50m

£701

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 6/3

08:00-19:00

1 stop15h 00m

Castries George F. L. Charle

Sun 15/3

12:35-05:25

1 stop12h 50m

£735

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 7/3

14:30-12:05

1 stop25h 35m

Castries George F. L. Charle

Sat 14/3

15:45-09:35

1 stop13h 50m

£762

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 3/3

09:40-18:25

1 stop12h 45m

Castries George F. L. Charle

Fri 13/3

15:45-09:55

1 stop14h 10m

£846

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 28/2

14:30-12:05

1 stop25h 35m

Castries George F. L. Charle

Sat 7/3

15:45-09:35

1 stop13h 50m

£858

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 24/4

19:50-22:10

3 stops31h 20m

Castries George F. L. Charle

Fri 1/5

18:00-20:10

2 stops21h 10m

£878

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 28/4

09:20-18:25

1 stop14h 05m

£552

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 22/2

09:40-19:00

1 stop13h 20m

£564

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 15 results
1
2

Best time to book a flight from Heathrow to Castries

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

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

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Castries (average of £372). Flying from London Heathrow Airport to Castries in December is currently the most expensive (average of £734). 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.

Reviews of airlines servicing Castries

Get insights into the airlines that provide service to Castries. 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 Castries. Reviews last updated 2 February 2026.
Check out reviews from past customers who have flown with British Airways from London Heathrow Airport to Castries to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,711 reviews
Check prices

Entertainment

6.4

Overall

6.7

Comfort

6.8

Food

6.4

Boarding

6.9

Crew

7.6

Reviews

1 / 20
6.0
Good

David,Jan 2026

LHR - MAD

It was a very old and tried plane. Lots of duck tape holding things together. Staff and food very good. Boarding was chaos at Madrid. Arrival in Lima swift and effective.
British Airways
6.7
Okay
7,711 reviews
British Airways
6.7
Okay
7,711 reviews
Check prices

Entertainment

6.4

Overall

6.7

Comfort

6.8

Food

6.4

Boarding

6.9

Crew

7.6

Reviews

1 / 20
6.0
Good

David,Jan 2026

LHR - MAD

It was a very old and tried plane. Lots of duck tape holding things together. Staff and food very good. Boarding was chaos at Madrid. Arrival in Lima swift and effective.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Castries. 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 into for flights to Castries from London Heathrow?

    Castries George F. L. Charle (SLU), located 0.7 mi from the city center, is the airport you fly into when you book flights from London Heathrow to Castries. 1 airline have flights to George F. L. Charle from London Heathrow on a regular basis. Booking flights from London Heathrow to Castries George F. L. Charle should not be difficult; the airport handles an average of 0 inbound flights from London Heathrow per day.

  • What is the cheapest airline to fly from London Heathrow Airport to Castries round-trip?

    Currently priced at £462, British Airways will fly you from London Heathrow Airport to Castries and back. In addition to British Airways, many other airlines offer competitively priced options for your trip.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to Castries 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 Castries?

    Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Castries (average of £372). Flying from London Heathrow Airport to Castries in December is currently the most expensive (average of £734). 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 Castries?

Book flights to Castries if you plan to visit one of these locations
Gros Islet
Rodney Bay

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Heathrow to Castries

See prices for flight routes from nearby airports that may be better suited for you.
Gatwick to Castries flights
Heathrow to Castries flights
London City to Castries flights
Gatwick to Castries flights

Top airline flying from Heathrow to Castries

Discover the top airline that operate flights from Heathrow to Castries. 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 2 February 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£462Average£647FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Castries from Heathrow today with Cheapflights!

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

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Castries for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

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

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

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

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