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Cheap flights from London Heathrow Airport to Castries from £399

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 14/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
30 Nov — 7 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 31 October 2025.

Round-trip from

£729

One-way from

£399

Popular in

May

Cheapest in

February

Average price

£554
25/2-11/3
  • 25/2-11/3
  • 2 total stops
  • 25h 10m total
  • London to Castries
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14/1
  • 14/1
  • 3 total stops
  • 31h 15m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£148 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 October 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 31 October 2025.

Thu 4/1213:20LHR - SLU
1 stop27h 50mMultiple Airlines
Thu 21/515:20SLU - LHR
1 stop15h 40mMultiple Airlines
Deal found 30/10£784
Wed 5/1109:40LHR - SLU
1 stop32h 55mMultiple Airlines
Tue 16/1207:30SLU - LHR
1 stop22h 05mMultiple Airlines
Deal found 30/10£837
Tue 9/1213:25LHR - SLU
1 stop26h 40mMultiple Airlines
Thu 21/512:35SLU - LHR
1 stop12h 15mMultiple Airlines
Deal found 30/10£846
Sat 1/1108:00LHR - SLU
1 stop31h 25mMultiple Airlines
Fri 7/1113:55SLU - LHR
1 stop16h 00mMultiple Airlines
Deal found 29/10£854
Fri 14/1109:00LHR - SLU
3 stops32h 10mMultiple Airlines
Sun 23/1119:10SLU - LHR
2 stops31h 20mMultiple Airlines
Deal found 29/10£877
Mon 3/1108:00LHR - SLU
1 stop13h 30mMultiple Airlines
Mon 10/1116:20SLU - LHR
3 stops33h 05mMultiple Airlines
Deal found 30/10£879
Fri 28/1118:00LHR - SLU
3 stops32h 10mMultiple Airlines
Fri 5/1213:55SLU - LHR
2 stops17h 25mMultiple Airlines
Deal found 29/10£908
Tue 9/1213:25LHR - SLU
1 stop26h 40mMultiple Airlines
Tue 16/1215:45SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 30/10£921

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 31 October 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

Wed 25/2

10:35-19:00

1 stop12h 25m

Castries George F. L. Charle

Wed 11/3

15:45-08:30

1 stop12h 45m

£729

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 25/1

13:20-19:00

1 stop33h 40m

Castries George F. L. Charle

Mon 2/2

15:45-08:30

1 stop12h 45m

£777

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 28/1

10:35-19:00

1 stop12h 25m

Castries George F. L. Charle

Fri 6/2

15:45-08:30

1 stop12h 45m

£790

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 9/12

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Thu 21/5

12:35-05:50

1 stop12h 15m

£846

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 27/1

13:25-15:15

1 stop29h 50m

Castries George F. L. Charle

Tue 24/2

15:45-08:30

1 stop12h 45m

£874

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 14/11

09:00-13:10

3 stops32h 10m

Castries George F. L. Charle

Sun 23/11

19:10-06:30

2 stops31h 20m

£877

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 9/12

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Tue 16/12

15:45-08:30

1 stop12h 45m

£921

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 7/1

10:30-13:10

3 stops30h 40m

Castries George F. L. Charle

Wed 14/1

10:25-20:10

2 stops29h 45m

£947

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 27/11

09:50-15:15

3 stops33h 25m

Castries George F. L. Charle

Mon 1/12

16:20-07:50

3 stops35h 30m

£984

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 14/1

09:55-13:10

3 stops31h 15m

£399

Flights are sorted by cheapest return flights first.

Deals found on 29/10

Showing 1-10 of 17 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 £386). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £672). 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 31 October 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
7,487 reviews
Check prices

Overall

6.7

Boarding

6.9

Food

6.3

Crew

7.6

Entertainment

6.4

Comfort

6.7

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
7,487 reviews
British Airways
6.7
Okay
7,487 reviews
Check prices

Overall

6.7

Boarding

6.9

Food

6.3

Crew

7.6

Entertainment

6.4

Comfort

6.7

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 £433, 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 32% 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 £386). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £672). 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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£433Average£600FlexibilityNo 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?

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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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