Cheap Flights from London to Castries from US$435

Frequently Asked Questions

• What are the cheapest flights from London to Castries (LON-SLU)?

  Based on Trip.com data, Air Transat offers one-way fares as low as US$435 on Cheapest nonstop routes (e.g. LGW to UVF on Sun, Sep 6), while British Airways offers Cheapest nonstop round-trips from US$691 departing on Wed, Sep 2 and returning on Tue, Sep 8.

• Which airlines offer direct flights from London to Castries?

  At the moment, you can catch a nonstop flight from London to Castries with the following airlines, including: British Airways Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from London to Castries?

  It takes about 8 hours 50 minutes to fly from London to Castries.

• When is the best time to book flights from London to Castries?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from London to Castries is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from London to Castries?

  Based on Trip.com data in the past 4 weeks, there is 7 flight per week flying from London to Castries. You can check the weekly schedule for popular airlines on this route below: British Airways: S/M/T/W/T/F/S -- BA2159 (10:26)

• How can I find the best deals on flights from London to Castries?

  To find best deals on flights from London to Castries, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sun, Sep 6, with one-way flights priced at just US$435.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is British Airways.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Castries travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from London (LON) to Castries (SLU) the cheapest?

  The cheapest months to fly from London to Castries is November, when demand for travel is lower.

• Which upcoming date is cheapest to fly from London to Castries on?

  After crunching the numbers on our August flight calendar, it's currently cheapest to fly from London to Castries on August 28, 2026 with British Airways, with prices starting at US$776.

• Which airports can I fly to for Castries from London?

  You can land at any one of the following hubs in Castries, with London Gatwick Airport to Hewanorra International Airport (LGW-UVF) is by far the most common option on this route: George F. L. Charles Airport (SLU) Hewanorra International Airport (UVF).

• Is there any time difference between London and Castries?

  The time difference between Castries and London is 4h.

• How do I change or cancel my ticket from London to Castries?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

• What is the average cost of a one-way flight from London to Castries?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from London to Castries is US$910. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from London to Castries?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from London to Castries is US$1,277. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from London to Castries on Trip.com?

  Enter London and Castries, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

• Are there budget airlines on the London to Castries route?

  Jetblue Airwaysare the most popular budget airlines flying from London to Castries. Check baggage, seat and payment fees before comparing the final price.