Find flights
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Castries from £448

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SLU
6 Apr — 13 Apr1
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 7 March 2026.

Tue 10/309:40
LHR
-
SLU
1 stop12h 45m
Multiple Airlines
Tue 17/316:20
SLU
-
LHR
1 stop13h 15m
Multiple Airlines
Deal found 3/3£687
Sun 1/1113:20
LHR
-
SLU
1 stop33h 40m
Multiple Airlines
Wed 11/1115:45
SLU
-
LHR
1 stop12h 45m
Multiple Airlines
Deal found 5/3£767
Mon 1/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Wed 1/712:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 5/3£799
Fri 5/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Mon 15/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 6/3£821
Tue 30/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Mon 6/712:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 5/3£829
Sun 7/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Fri 12/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 7/3£841
Mon 1/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Mon 29/609:10
SLU
-
LHR
1 stop16h 05m
Multiple Airlines
Deal found 4/3£847
Tue 30/611:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Tue 7/712:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 3/3£852
Sat 30/511:10
LHR
-
SLU
1 stop12h 50m
Multiple Airlines
Sun 7/612:35
SLU
-
LHR
1 stop12h 40m
Multiple Airlines
Deal found 4/3£853
Mon 9/309:40
LHR
-
SLU
1 stop12h 45m
Multiple Airlines
Mon 16/316:20
SLU
-
LHR
1 stop13h 35m
Multiple Airlines
Deal found 4/3£855

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 7 March 2026.

Round-trip from

£799

One-way from

£448

Popular in

April

Cheapest in

November
1/6-1/7
  • 1/6-1/7
  • 2 total stops
  • 25h 30m total
  • London to Castries
Search Deals
17/4
  • 17/4
  • 3 total stops
  • 41h 15m total
  • London to Castries
Search Deals
Highest demand for flights based on searches. 45% potential increase in price (£531 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 15% potential price decrease (£88 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 7 March 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
Fastest return journey

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 5/6

09:35-19:00

1 stop14h 25m

Castries George F. L. Charle

Sun 7/6

15:45-09:20

1 stop12h 35m

£950

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 2/4

17:40-19:00

2 stops30h 20m

Castries George F. L. Charle

Wed 8/4

09:10-11:50

2 stops21h 40m

£1,079

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Sat 4/4

12:40-19:00

3 stops35h 20m

Castries George F. L. Charle

Sun 12/4

12:35-11:50

2 stops18h 15m

£1,104

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 18/3

16:35-13:10

2 stops24h 35m

Castries George F. L. Charle

Sat 28/3

12:35-19:10

3 stops26h 35m

£1,187

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 3/4

17:40-19:00

3 stops30h 20m

Castries George F. L. Charle

Sun 12/4

19:30-11:50

3 stops35h 20m

£1,230

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 23/4

20:05-14:35

2 stops23h 30m

Castries George F. L. Charle

Sat 16/5

13:55-14:15

2 stops19h 20m

£1,248

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 3/9

19:25-14:35

2 stops24h 10m

Castries George F. L. Charle

Thu 17/9

17:50-20:10

2 stops21h 20m

£1,303

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Thu 7/5

10:45-19:00

1 stop13h 15m

Castries George F. L. Charle

Sun 10/5

05:00-08:05

2 stops22h 05m

£1,338

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Fri 3/4

14:05-19:00

2 stops33h 55m

Castries George F. L. Charle

Sat 11/4

17:50-10:00

3 stops35h 10m

£1,371

LondonCastries

LHR - SLU

LHRSLU

London Heathrow

Wed 18/3

08:00-19:00

1 stop15h 00m

Castries George F. L. Charle

Sat 21/3

13:55-14:25

2 stops20h 30m

£1,413

Flights are sorted by cheapest return flights first.

Deals found on 3/3

Showing 1-10 of 20 resultsSorted by cheapest first
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 December is currently the most expensive (average of £794). 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 7 March 2026.
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
7,779 reviews
Check prices

Boarding

6.9

Crew

7.6

Entertainment

6.4

Overall

6.7

Comfort

6.8

Food

6.4

Reviews

1 / 20
6.0
Good

David,Jan 2026

LHR - MAD

It was a very old and tried plane. Lots of duck tape holding things together. Staff and food very good. Boarding was chaos at Madrid. Arrival in Lima swift and effective.
British Airways
6.7
Okay
7,779 reviews
British Airways
6.7
Okay
7,779 reviews
Check prices

Boarding

6.9

Crew

7.6

Entertainment

6.4

Overall

6.7

Comfort

6.8

Food

6.4

Reviews

1 / 20
6.0
Good

David,Jan 2026

LHR - MAD

It was a very old and tried plane. Lots of duck tape holding things together. Staff and food very good. Boarding was chaos at Madrid. Arrival in Lima swift and effective.

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 £490, 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.

  • 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 December is currently the most expensive (average of £794). 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 7 March 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£490Average£819FlexibilityNo 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.