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C$138 Cheap Flights from Boston Logan International (BOS) to Castries (SLUA)

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Flight deals from Boston Logan International Airport to Castries

Looking for a cheap last-minute deal or the best return flight from Boston Logan International Airport to Castries? If you want to travel next month, return fares start from C$809. Find the lowest prices on one-way and return tickets right here.
Castries.C$138 per passenger.Departing 2026-04-24.One-way flight with United.Outbound indirect flight with United, departs from Boston Logan International on 2026-04-24, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$138, select.
Castries.C$158 per passenger.Departing 2026-08-04.One-way flight with Delta.Outbound indirect flight with Delta, departs from Boston Logan International on 2026-08-04, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$158, select.
Castries.C$160 per passenger.Departing 2026-09-02.One-way flight with Delta.Outbound indirect flight with Delta, departs from Boston Logan International on 2026-09-02, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$160, select.
Castries.C$244 per passenger.Departing 2026-04-25.One-way flight with jetBlue.Outbound direct flight with jetBlue departs from Boston Logan International on 2026-04-25, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$244, select.
Castries.C$270 per passenger.Departing 2026-06-11.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on 2026-06-11, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$270, select.
Castries.C$299 per passenger.Departing 2026-05-21.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on 2026-05-21, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$299, select.
Castries.C$375 per passenger.Departing 2026-07-16.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on 2026-07-16, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$375, select.
Castries.C$386 per passenger.Departing 2026-10-31.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on 2026-10-31, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$386, select.
Castries.C$386 per passenger.Departing 2026-11-01.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on 2026-11-01, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$386, select.

Find the cheapest month to fly from Boston Logan International to Castries

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Boston Logan International to Castries flights are currently cheapest in April.
Apr.
from C$138
May
from C$299
Jun.
from C$270
Jul.
from C$375
Aug.
from C$158
Sep.
from C$160
Oct.
from C$386
Nov.
from C$386
Dec.
Find prices
Jan.
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Feb.
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Mar.
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Which airlines fly from Boston Logan International to Castries?

Alternative Boston Logan International to Castries routes

Looking for the cheapest, fastest or easiest route from Boston Logan International to Castries? You could fly into the following airports instead.

St Lucia Vigie

1km from central Castries
Closest
from C$441
Search flights

St Lucia Hewanorra

31km from central Castries
Cheapest
from C$138
Search flights

Boston to Castries: Flight information

The things to know before you go.
Cheapest flight foundC$138
Cheapest month to flyApril
Average flight time4 hrs, 51 mins
Most popular airlinejetBlue
Average flights per week2

Finding cheap flights from Boston Logan International to Castries: Frequently asked questions

There are 2 airports in Castries: St Lucia Vigie and St Lucia Hewanorra.
The best price we found for a return flight from Boston Logan International to Castries is C$628. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 51 minutes is the average flight time from Boston Logan International to Castries.
jetBlue flies direct from Boston Logan International to Castries.
As of April 2026, there are 2 flights per week flying from Boston Logan International to Castries.
The cheapest month to fly from Boston Logan International to Castries is usually April.
If you're flying from Boston Logan International Airport, the cheapest airport near Castries is St Lucia Hewanorra – which is 30.5 km away from the centre of Castries. We've found flights into this airport from C$628.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Boston Logan International Airport to Castries on Friday, April 3, 2026.
Yes – the average flight time is 4 hours and 51 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Castries but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Castries is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 27°C. September is typically the warmest month in Castries, when it usually averages around 28°C. You can expect the least rain in February. The coldest month is February, with temperatures averaging 25°C. The rainiest month is October.
Currently, Delta and jetBlue offer the cheapest flight tickets to Castries.

Travelling from Logan International Airport (BOS) to Castries: what you need to know

  • Hop on a direct flight from Logan International Airport to Castries and you'll be in the air for an average of 5 hours 19 minutes.

  • Boston (the location of Logan International Airport) and Castries are in the same timezone — UTC-4.

  • For a stress-free journey, arrive at the airport two hours ahead of international flights and an hour before domestic departures. This ensures you have enough time to catch your flight from BOS to Castries.

  • Travelling during a peak month like August? Busy periods (like summer, Christmas and New Year) can easily add another hour at security. Be extra safe and arrive up to four hours before an international flight and two hours before domestic departures.

  • You can book a direct flight from Logan International Airport to Castries that touches down at Hewanorra Airport (UVF).

  • Be on the lookout for offers from jetBlue. This airline has direct flights from Logan International Airport to Castries.

  • Stopovers are the perfect opportunity to break up your journey — and possibly even tour another city. When browsing flights from BOS to Castries, deselect the 'Direct flights only' box to see where you can visit along the way. Top options include:

    • John F. Kennedy International Airport (JFK)

    • Pearson International Airport (YYZ)

    • Newark Liberty International Airport (EWR)

  • If you have a passport from United States and plan to travel to Saint Lucia for tourism purposes, you won't need a visa. However, entry and visa requirements may vary based on the length of your trip and are subject to change. For the latest rules, contact your destination's nearest consulate or embassy before booking a cheap ticket from Logan International Airport to Castries.

  • BOS is around 5 kilometres from central Boston. If you're driving, ride-sharing or catching a cab from the centre, it'll take 12 minutes or so to get there, depending on the traffic. If you're taking public transport, expect the journey time to be approximately 23 minutes.

  • Planning to catch an early flight from Logan International Airport to Castries? Avoid the hassle of rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these stays close to BOS:

How to find the cheapest flights from Logan International Airport (BOS) to Castries

  • C$138 is the cheapest price we've found for a one-way ticket from Logan International Airport to Castries. For a return flight on this route, the best price is C$628. Depending on when you want to go and the availability, these fares may change.

  • Book 6 months before your departure date. After looking at the numbers on our calendar, this is how far you should book ahead to secure cheap tickets from BOS to Castries.

  • Organize your trip for February. That's the cheapest month for tickets from Logan International Airport to Castries. If you're flexible with your travel dates, use the 'Whole month' tool to find the cheapest price across each month.

  • Finding a cheap ticket from BOS to Castries is a piece of cake with Price Alerts. Simply set up one of these automatic alerts and we'll get in touch as soon as the price has fallen.

  • Use the filters to tailor your flights from Logan International Airport to Castries. Enter your ideal arrival and departure times, airlines and number of stops. Or sort your results by 'Cheapest' to find the best deals.

Airports in Castries

Hewanorra Airport (UVF)

  • Hewanorra Airport (UVF) to central Castries is about 1 hour and 9 minutes by car. It's approximately 56 kilometres away.

  • If you're arriving on a late flight from Logan International Airport to Castries, nothing beats the convenience of staying near the terminal. Grab your bags from the carousel and then be showered and resting soon after at one of these accommodation options near UVF:

George F. L. Charles Airport (SLU)

  • Once your flight from Logan International Airport to Castries has hit the runway, you can get to the city centre in about 6 minutes by car. Central Castries is roughly 3 kilometres from George F. L. Charles Airport (SLU).

  • The trip will take roughly 40 minutes on public transport.

  • Place the 'Do not disturb' sign on your door and rest at a hotel near SLU. Here are a few options where you can take a load off after your flight from BOS to Castries:

Best time to go to Castries

  • It's time to pick your trip dates for your flight from Logan International Airport to Castries. July is the busiest month to visit Castries. If you want a quieter vibe, go in May.

  • The warmest month in Castries is September, with the temperature ranging between 26ºC and 30ºC. Book your flights from Logan International Airport to Castries in this month if this is the type of weather you enjoy.

  • If you like travelling in cooler conditions, look for a cheap flight from BOS to Castries in February when temperatures average between 24ºC and 28ºC.

More about Castries

  • When it comes to looking for somewhere to rest your head, you'll find the most popular stays in Castries right here. Browse these hotels once you've locked in your flight from Logan International Airport to Castries:

  • Derek Walcott Square and Morne Fortune are just two of the top-rated attractions to add to your Castries must-do list. Keep the momentum going by heading to Immaculate Conception Church.

Complete your Castries trip with a car rental

  • Select one of our car rentals in Castries and see the sights on your own terms. Easily compare options in one go to find the ideal ride once you've booked your hotel and cheap flights from Logan International Airport to Castries.

Plan the rest of your trip from Boston to Castries

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.