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Cheap flights from London Heathrow Airport to Castries from £512

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
17 May — 24 May1
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 17 April 2026.

Thu 24/910:45
LHR
-
SLU
1 stop13h 15m
Multiple Airlines
Fri 25/912:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 15/4£846
Thu 4/610:45
LHR
-
SLU
1 stop13h 15m
Multiple Airlines
Tue 17/1112:35
SLU
-
LHR
1 stop13h 15m
Multiple Airlines
Deal found 15/4£852
Thu 1/1010:45
LHR
-
SLU
1 stop13h 15m
Multiple Airlines
Thu 22/1012:35
SLU
-
LHR
1 stop12h 15m
Multiple Airlines
Deal found 16/4£855
Tue 16/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Mon 6/712:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 12/4£863
Thu 8/1010:45
LHR
-
SLU
1 stop13h 15m
Multiple Airlines
Sun 11/1012:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 16/4£863
Sat 5/911:10
LHR
-
SLU
1 stop29h 55m
Multiple Airlines
Sat 12/912:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 15/4£873
Wed 3/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Tue 16/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 15/4£889
Wed 26/811:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Mon 31/812:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 16/4£889
Sun 30/811:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Sun 13/909:10
SLU
-
LHR
1 stop16h 05m
Multiple Airlines
Deal found 12/4£897
Mon 1/611:10
LHR
-
SLU
1 stop29h 55m
Multiple Airlines
Wed 10/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 13/4£918
Sat 13/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Sat 18/712:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 12/4£923
Thu 11/610:45
LHR
-
SLU
1 stop13h 15m
Multiple Airlines
Fri 19/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 12/4£923

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 17 April 2026.

Round-trip from

£846

One-way from

£512

Popular in

August

Cheapest in

November
24/9-25/9
  • 24/9-25/9
  • 2 total stops
  • 25h 55m total
  • London to Castries
Search Deals
9/5
  • 9/5
  • 3 total stops
  • 37h 20m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£111 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease (£54 potential savings vs. average return price).
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 17 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Castries that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 24/9

10:45-19:00

1 stop13h 15m

Castries George F. L. Charle

Fri 25/9

12:35-06:15

1 stop12h 40m

£846
Fastest return journey

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 13/6

11:10-19:00

1 stop12h 50m

Castries George F. L. Charle

Tue 14/7

12:35-06:15

1 stop12h 40m

£979

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 12/5

20:05-19:00

3 stops27h 55m

Castries George F. L. Charle

Sat 16/5

17:50-20:10

2 stops21h 20m

£1,145

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 26/5

08:20-10:30

3 stops31h 10m

Castries George F. L. Charle

Sun 31/5

05:00-20:10

2 stops34h 10m

£1,217

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Mon 1/6

14:45-09:30

3 stops47h 45m

Castries George F. L. Charle

Mon 8/6

19:05-07:40

3 stops55h 35m

£1,260

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 8/10

14:05-14:35

3 stops29h 30m

Castries George F. L. Charle

Sun 11/10

15:20-14:15

2 stops17h 55m

£1,330

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 2/7

10:45-19:00

1 stop13h 15m

Castries George F. L. Charle

Thu 13/8

12:35-05:50

1 stop12h 15m

£1,332

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 3/7

12:05-13:10

2 stops30h 05m

Castries George F. L. Charle

Fri 10/7

12:35-11:50

2 stops18h 15m

£1,335

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 30/7

14:10-19:00

2 stops33h 50m

Castries George F. L. Charle

Thu 13/8

09:10-11:50

2 stops21h 40m

£1,387

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 26/8

16:50-13:10

3 stops25h 20m

Castries George F. L. Charle

Mon 31/8

19:10-08:50

2 stops32h 40m

£1,433

Flights are sorted by cheapest return flights first.

Deals found on 13/4

Showing 1-10 of 19 resultsSorted by cheapest first
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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.

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. 0 airlines 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.

  • 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.

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

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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