Find flights
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Castries from £532

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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
4 Jan — 11 Jan1
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 5 December 2025.

Mon 8/1209:40LHR - SLU
1 stop11h 50mMultiple Airlines
Fri 24/415:45SLU - LHR
1 stop15h 15mMultiple Airlines
Deal found 3/12£721
Sat 6/1214:30LHR - SLU
1 stop24h 55mMultiple Airlines
Tue 9/1207:30SLU - LHR
1 stop22h 05mMultiple Airlines
Deal found 3/12£786
Thu 11/1213:20LHR - SLU
1 stop27h 50mMultiple Airlines
Thu 18/1215:20SLU - LHR
1 stop14h 15mMultiple Airlines
Deal found 3/12£912
Thu 4/1214:50LHR - SLU
3 stops32h 10mMultiple Airlines
Sat 31/118:20SLU - LHR
3 stops32h 50mMultiple Airlines
Deal found 4/12£1,081
Wed 24/1213:25LHR - SLU
2 stops33h 35mMultiple Airlines
Thu 22/118:20SLU - LHR
3 stops32h 50mMultiple Airlines
Deal found 3/12£1,125
Tue 30/1213:20LHR - SLU
1 stop29h 55mMultiple Airlines
Sun 11/112:10SLU - LHR
1 stop13h 15mMultiple Airlines
Deal found 4/12£1,162
Tue 23/1213:25LHR - SLU
3 stops33h 35mMultiple Airlines
Thu 22/118:20SLU - LHR
3 stops32h 50mMultiple Airlines
Deal found 3/12£1,178
Tue 16/1213:25LHR - SLU
2 stops33h 35mMultiple Airlines
Wed 31/1209:10SLU - LHR
2 stops22h 10mMultiple Airlines
Deal found 3/12£1,279

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 5 December 2025.

Round-trip from

£695

One-way from

£532

Popular in

May

Cheapest in

November

Average price

£821
27/4-13/5
  • 27/4-13/5
  • 2 total stops
  • 27h 10m total
  • London to Castries
Search Deals
6/2
  • 6/2
  • 3 total stops
  • 32h 20m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£98 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 5 December 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

Tue 27/1

13:20-15:15

1 stop29h 55m

Castries George F. L. Charle

Fri 6/2

15:45-09:55

1 stop14h 10m

£698

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 1/3

08:00-19:00

1 stop15h 00m

Castries George F. L. Charle

Sun 15/3

09:10-09:55

1 stop20h 45m

£700

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Mon 19/1

09:40-17:30

1 stop11h 50m

Castries George F. L. Charle

Mon 26/1

15:45-09:55

1 stop14h 10m

£702

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 29/4

12:05-19:00

1 stop11h 55m

Castries George F. L. Charle

Wed 6/5

09:10-12:00

1 stop21h 50m

£728

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 28/5

12:05-19:00

1 stop11h 55m

Castries George F. L. Charle

Thu 4/6

15:45-12:00

1 stop15h 15m

£743

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 5/3

13:25-19:00

1 stop33h 35m

Castries George F. L. Charle

Tue 10/3

12:35-05:50

1 stop13h 15m

£753

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Mon 23/2

10:35-19:00

1 stop12h 25m

Castries George F. L. Charle

Sun 29/3

15:45-12:25

1 stop15h 40m

£782

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 17/3

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Tue 31/3

12:35-12:25

1 stop18h 50m

£990

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 1/2

12:25-15:35

3 stops31h 10m

Castries George F. L. Charle

Sun 8/2

19:10-07:10

3 stops32h 00m

£1,002

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 1/1

13:20-13:10

1 stop27h 50m

Castries George F. L. Charle

Thu 8/1

15:20-10:15

2 stops14h 55m

£1,088

Flights are sorted by cheapest return flights first.

Deals found on 3/12

Showing 1-10 of 19 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 £381). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £669). 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 5 December 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
7,562 reviews
Check prices

Boarding

6.9

Food

6.4

Entertainment

6.4

Crew

7.6

Comfort

6.7

Overall

6.7

Reviews

1 / 20
10.0
Excellent

María Victoria,Nov 2025

LHR - GRU

Seats were comfortable for economy. Blanket and pillow provided, same as headphones. For some reason the uk plug wouldn’t charge and had to use the US charger. Also couldn’t use WiFi as keep saying BA club pw was wrong although it wasn’t: but minor things. Overall good flight and attentive crew.
British Airways
6.7
Okay
7,562 reviews
British Airways
6.7
Okay
7,562 reviews
Check prices

Boarding

6.9

Food

6.4

Entertainment

6.4

Crew

7.6

Comfort

6.7

Overall

6.7

Reviews

1 / 20
10.0
Excellent

María Victoria,Nov 2025

LHR - GRU

Seats were comfortable for economy. Blanket and pillow provided, same as headphones. For some reason the uk plug wouldn’t charge and had to use the US charger. Also couldn’t use WiFi as keep saying BA club pw was wrong although it wasn’t: but minor things. Overall good flight and attentive crew.

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 £469, 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 27% 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 £381). Flying from London Heathrow Airport to Castries in July is currently the most expensive (average of £669). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 5 December 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£469Average£593FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.