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Cheap flights from London Heathrow Airport to Castries from £508

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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
24 Aug — 31 Aug1
1 adult

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 19 August 2025.

Round-trip from

£646

One-way from

£508

Popular in

May

Cheapest in

March

Average price

£756
11/9-21/9
  • 11/9-21/9
  • 2 total stops
  • 26h 10m total
  • London to Castries
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5/2
  • 5/2
  • 1 total stop
  • 33h 10m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£139 potential increase over avg. return price).
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Cheapest flight prices on average. 6% potential price decrease (£30 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Heathrow to Castries

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 19 August 2025.

Thu 11/908:05LHR - SLU
1 stop11h 30mMultiple Airlines
Sun 21/912:10SLU - LHR
1 stop14h 40mMultiple Airlines
Deal found 18/8£646
Sun 21/911:25LHR - SLU
1 stop12h 35mMultiple Airlines
Sun 5/1012:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 17/8£686
Thu 11/911:00LHR - SLU
1 stop13h 00mMultiple Airlines
Thu 25/909:10SLU - LHR
1 stop15h 45mMultiple Airlines
Deal found 18/8£697
Sun 21/911:25LHR - SLU
1 stop12h 35mMultiple Airlines
Wed 1/1012:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 19/8£704
Tue 7/1011:25LHR - SLU
1 stop12h 35mMultiple Airlines
Tue 21/1012:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 18/8£706
Wed 17/911:25LHR - SLU
1 stop12h 35mMultiple Airlines
Sat 27/912:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 19/8£712
Fri 12/911:25LHR - SLU
1 stop12h 35mMultiple Airlines
Sun 21/912:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 19/8£728
Tue 4/1110:35LHR - SLU
1 stop12h 25mMultiple Airlines
Tue 18/1112:35SLU - LHR
1 stop13h 15mMultiple Airlines
Deal found 18/8£737
Wed 1/1011:25LHR - SLU
1 stop12h 35mMultiple Airlines
Wed 8/1012:35SLU - LHR
1 stop12h 45mMultiple Airlines
Deal found 17/8£745
Fri 10/1009:35LHR - SLU
2 stops32h 35mMultiple Airlines
Fri 17/1012:15SLU - LHR
2 stops26h 45mMultiple Airlines
Deal found 19/8£795

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 19 August 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

Thu 11/9

08:05-14:35

1 stop11h 30m

Castries George F. L. Charle

Sun 21/9

12:10-07:50

1 stop14h 40m

£646

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 21/9

11:25-19:00

1 stop12h 35m

Castries George F. L. Charle

Sun 5/10

12:35-06:20

1 stop12h 45m

£686

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 11/9

11:00-19:00

1 stop13h 00m

Castries George F. L. Charle

Thu 25/9

09:10-05:55

1 stop15h 45m

£697

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sun 21/9

11:25-19:00

1 stop12h 35m

Castries George F. L. Charle

Wed 1/10

12:35-06:20

1 stop12h 45m

£704

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 7/10

11:25-19:00

1 stop12h 35m

Castries George F. L. Charle

Tue 21/10

12:35-06:20

1 stop12h 45m

£706

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 17/9

11:25-19:00

1 stop12h 35m

Castries George F. L. Charle

Sat 27/9

12:35-06:20

1 stop12h 45m

£712

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 13/1

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Tue 27/1

15:45-08:30

1 stop12h 45m

£714

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 12/9

11:25-19:00

1 stop12h 35m

Castries George F. L. Charle

Sun 21/9

12:35-06:20

1 stop12h 45m

£728

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 4/11

10:35-19:00

1 stop12h 25m

Castries George F. L. Charle

Tue 18/11

12:35-05:50

1 stop13h 15m

£737

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Tue 13/1

13:25-12:05

1 stop26h 40m

Castries George F. L. Charle

Mon 9/2

15:45-08:30

1 stop12h 45m

£744

Flights are sorted by cheapest return flights first.

Deals found on 18/8

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.

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 19 August 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
7,283 reviews
Check prices

Boarding

6.9

Comfort

6.7

Food

6.3

Overall

6.7

Crew

7.6

Entertainment

6.4

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

LHR - LAX

We needed assistance (wheelchair, golf cart, whatever ) to get to next gate. We requested it. None was provided.
British Airways
6.7
Okay
7,283 reviews
British Airways
6.7
Okay
7,283 reviews
Check prices

Boarding

6.9

Comfort

6.7

Food

6.3

Overall

6.7

Crew

7.6

Entertainment

6.4

Reviews

1 / 20
6.0
Good

Anonymous,May 2025

LHR - LAX

We needed assistance (wheelchair, golf cart, whatever ) to get to next gate. We requested it. None was provided.

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 £422, 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.

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 19 August 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£422Average£560FlexibilityNo 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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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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