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Cheap flights from London Heathrow Airport to Castries from £409

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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
14 Dec — 21 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap 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 14 November 2025.

Round-trip from

£659

One-way from

£409

Popular in

May

Cheapest in

November

Average price

£507
19/1-26/1
  • 19/1-26/1
  • 2 total stops
  • 26h 00m total
  • London to Castries
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3/12
  • 3/12
  • 2 total stops
  • 30h 20m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£109 potential increase over avg. return price).
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Cheapest flight prices on average. 6% potential price decrease (£32 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find 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 14 November 2025.

Tue 2/1209:40LHR - SLU
1 stop13h 20mMultiple Airlines
Tue 16/1207:30SLU - LHR
1 stop22h 25mMultiple Airlines
Deal found 13/11£843
Thu 11/1213:20LHR - SLU
1 stop27h 50mMultiple Airlines
Thu 18/1215:20SLU - LHR
1 stop14h 15mMultiple Airlines
Deal found 11/11£845
Sun 16/1118:00LHR - SLU
2 stops27h 30mMultiple Airlines
Sun 23/1112:10SLU - LHR
2 stops19h 10mMultiple Airlines
Deal found 13/11£878
Wed 26/1118:00LHR - SLU
2 stops29h 00mMultiple Airlines
Wed 3/1210:15SLU - LHR
3 stops21h 05mMultiple Airlines
Deal found 13/11£910
Fri 28/1118:00LHR - SLU
3 stops32h 10mMultiple Airlines
Sat 6/1212:35SLU - LHR
2 stops18h 45mMultiple Airlines
Deal found 11/11£929
Wed 26/1112:15LHR - SLU
3 stops28h 55mMultiple Airlines
Sun 30/1119:10SLU - LHR
3 stops35h 40mMultiple Airlines
Deal found 11/11£956
Wed 26/1113:25LHR - SLU
1 stop26h 40mMultiple Airlines
Tue 2/1212:35SLU - LHR
1 stop13h 15mMultiple Airlines
Deal found 13/11£961

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 14 November 2025.
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

Mon 11/5

12:05-12:05

1 stop29h 00m

Castries George F. L. Charle

Mon 25/5

15:45-12:00

1 stop15h 15m

£678

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 4/2

13:25-15:15

1 stop29h 50m

Castries George F. L. Charle

Wed 11/2

12:35-05:50

1 stop13h 15m

£730

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 15/1

13:20-13:10

1 stop27h 50m

Castries George F. L. Charle

Fri 23/1

13:55-09:55

1 stop16h 00m

£731

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 21/1

13:25-19:00

1 stop33h 35m

Castries George F. L. Charle

Wed 4/2

15:45-08:30

1 stop12h 45m

£747

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 27/1

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Tue 3/2

15:45-08:30

1 stop12h 45m

£758

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 24/1

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Fri 30/1

15:45-08:30

1 stop12h 45m

£776

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 29/1

13:25-15:15

1 stop29h 50m

Castries George F. L. Charle

Thu 12/2

15:45-08:30

1 stop12h 45m

£817

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 14/1

10:35-19:00

1 stop12h 25m

Castries George F. L. Charle

Wed 28/1

15:45-08:30

1 stop12h 45m

£834

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 11/12

13:20-13:10

1 stop27h 50m

Castries George F. L. Charle

Thu 18/12

15:20-09:35

1 stop14h 15m

£885

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 8/2

13:20-12:05

1 stop26h 45m

Castries George F. L. Charle

Sat 14/2

15:45-08:30

1 stop12h 45m

£899

Flights are sorted by cheapest return flights first.

Deals found on 13/11

Showing 1-10 of 18 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 £387). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £673). 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 14 November 2025.
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
7,520 reviews
Check prices

Comfort

6.7

Entertainment

6.4

Boarding

6.9

Overall

6.7

Food

6.3

Crew

7.6

Reviews

1 / 20
6.0
Good

Roxanne,Sept 2025

LHR - IAD

Food was mediocre. Couldn't use headphones because no information on how to use. Staff paid so much attention on a family with a baby . They got VIP treatment.
British Airways
6.7
Okay
7,520 reviews
British Airways
6.7
Okay
7,520 reviews
Check prices

Comfort

6.7

Entertainment

6.4

Boarding

6.9

Overall

6.7

Food

6.3

Crew

7.6

Reviews

1 / 20
6.0
Good

Roxanne,Sept 2025

LHR - IAD

Food was mediocre. Couldn't use headphones because no information on how to use. Staff paid so much attention on a family with a baby . They got VIP treatment.

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 £434, 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. British Airways is 33% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 £387). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £673). 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.
Heathrow to Castries flights
Gatwick 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 14 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£434Average£601FlexibilityNo 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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