£464 Find Cheap Flights from London Heathrow Airport to Saint Lucia – Compare and Save

1 adult
1 adult, Economy, 0 bags

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KAYAK's insights & trends for Heathrow to Saint Lucia flights

Get data-powered insights and trends into flights from Heathrow to Saint Lucia to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from London Heathrow Airport to Saint Lucia?

The cheapest month for flights from London Heathrow Airport to Saint Lucia is September, when tickets cost £585 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of return tickets is £1,010 and £993 respectively.

Good to know - Cheap tickets from London Heathrow Airport to Saint Lucia

Low season

May

Cheapest flight

£464
Best time to beat the crowds but there is an average 5% increase in price.
Most popular time to fly (25% more expensive on average)
Flight from London Heathrow Airport to Castries

FAQs - booking Saint Lucia flights

  • How does KAYAK find such low prices on flights from London Heathrow Airport to Saint Lucia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London Heathrow Airport to Saint Lucia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to Saint Lucia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from London Heathrow Airport to Saint Lucia is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London Heathrow Airport to Saint Lucia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from London Heathrow Airport to Saint Lucia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport to Saint Lucia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from London Heathrow Airport to Saint Lucia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Heathrow to Saint Lucia

 
Need help choosing which airline to fly with from Heathrow to Saint Lucia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.0
American AirlinesOverall score based on 12208 reviews
7.1Comfort
6.8Entertainment
6.4Food
7.4Boarding
7.9Crew
Airline reviews

My seat was at the very back of the aircraft, and there was no overhead space available near my seat. The flight attendant told me to go back towards the middle of the aircraft to store my carry-on luggage. I politely explained that I would do so once boarding was completed and the aisle was clear, as passengers were still boarding behind me and it was impossible to move against them. However, she kept insisting that I go back immediately, speaking to me in a very rude and aggressive manner. The situation escalated unnecessarily, and I found her attitude extremely unprofessional and unacceptable.

2.0 MediocreAnonymous, Oct 2026
Read more American Airlines reviews

My seat was at the very back of the aircraft, and there was no overhead space available near my seat. The flight attendant told me to go back towards the middle of the aircraft to store my carry-on luggage. I politely explained that I would do so once boarding was completed and the aisle was clear, as passengers were still boarding behind me and it was impossible to move against them. However, she kept insisting that I go back immediately, speaking to me in a very rude and aggressive manner. The situation escalated unnecessarily, and I found her attitude extremely unprofessional and unacceptable.

The seat configuration was insane. Horrible. Had to jump over sleeping people to go the bathroom. The food was the best we’ve had in any Business class.

Our plane was delayed for an hour because they had the wrong tow truck that pulls the plane out of the gate. An hour late just to find the right vehicle that pushes the plane out of the gate area! The delay made us barely make our connecting flight but of course our luggage didn’t make it. So no luggage when we arrived at our destination.

Best: Flight attendants. Worst: Bags took forever to receive at LAX despite being tagged Priority - at least a 35 minute wait.

It was one hour 15 minutes late taking off so we missed our connecting flight in Philadelphia.

Crew did a great job, but aircraft was old and bitterly cold. Arrived early in CLT but had to wait for 30 mins for a gate. I knew in the plane what time we were arriving 8 hours before landing and it's basically an American Airlines airport, think they would have had space for an international flight lined up lol

Cabin crew were good Food could be a lot better

Really good, premium economy is worth for a daytime flight coming back from europe

Horrible! We departed out of terminal 5, not only was the sign for flights and gate information were so badly organized that it took 2 minutes for all of the flight info load for the correct airline. One would think BA would have new and well managed jet ways, but no you had to take a bus to the plane. It took for every and detailed departure by 40 mins. I’ve had better class of service from Indian Airlines. BA needs to work on upscaling to meet the Industry norms. I can see regional airlines using this loading method but not on an international flight.

Plane features were VERY old and outdated. footrest cushion was completely lose, plane felt dirty and a bit grimy. i was in business class. the lead flight attendant, Mary made a few announcements that didn't seem to put the cabin at ease (it didn't necessarily bother me, but could have bothered others). she said "the seat cushions aren't FDA approved, so you have to put them on after we take flight." everyone had already applied the seat cushions, and saying something isn't approved for flight may cause alarm. she also said at one point over the announcement ... "we can't get up because we are too afraid of the jet stream impacts" -- again, not helpful to those who are nervous fliers.

My experience on this flight was good. The seat I had had a lot of leg room, but it was so close to the aisle that the flight attendants kept bumping into my visual monitor connected to my seat to watch tv.

It was fine, but it cost me twice as much to return to Boston as it took me to get to Heathrow from Boston two weeks prior. I flew on Jet Blue over and it was half the cost of British Air.

Staff and comfort were great but first choice meal was unavailable even in row 21.

My only issue with my flight to Jersey was that the Gate wasn't announced until shortly before boarding, otherwise all went well even with how busy Heathrow was. I appreciate British Airways staff's politeness, hospitality and positive energy.

Cabin crew was very good. No wifi and no doors to the suites

Very timly. Great service !!! Pick up after meals can be swifter.

Straightforward boarding process. Pilot kept us informed during the flight, especially highlighting the fact that we would experience "significant braking" when we landed on the short runway in Florence. The flight attendants were pleasant. My chief complaint is that I was stuffed into a seat in the rear of the aircraft (row 29?). The seat pitch was soooo tight that my knees were hard against the seat in front of me as soon as I sat down. One inch more room would have made a difference. Thankfully it was not a super long flight, but it was quite uncomfortable and I had to work out the kinks in my knees once I deplaned. Is it really necessary to have the rows this close together??

Would not let me board with my fragile guitar so had to check it in. Who knows what the icicles did to it. Not happy. Had to run to catch my connection in Heathrow. After a bus and a train? Was asked by a guy in the middle seat to change my window seat with his girlfriend's middle seat further up in the plane and I was insulted. What nerve! The food was unhealthy and the seat was cramped. Could not wait to exit.

need more US friendly food options. Directions on getting to the next gate were terrible - resulted in long walks to the terminal and then finding I couldn;t enter there and had long walk back, then train to security then train back to where I started in the first place

We never made this flight due to the flight from Barcelona being delayed, which I have reviewed in a separate review. But I can tell you that the Delta Airlines flight that did get us home, I am extremely happy with them and their crew. The only one person that I would praise within the entire part of BA is the girl I spoke to in the call center in India. Who completely understood, was dedicated to a resolution and was a complete realist in the situation. Unlike some of the people who don’t care about the human element and stick you on a flight whenever. She got us home.

More options for your flight from Heathrow to Saint Lucia

Complete your trip to Saint Lucia with a hotel stay or car hire