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Cheap flights from Boston (BOSA) to Castries (SLUA)

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      Travellers and cabin class, 1 Adult, Economy
      jetBlue

      Compare Boston to Castries flight deals

      Find the cheapest month or even day of the year to fly to Castries

      Book the best Castries fare with no extra fees

      Flight deals from Boston to Castries

      Looking for a cheap last-minute deal or the best return flight from Boston to Castries? If you want to travel next month, return fares start from $601. Find the lowest prices on one-way and return tickets right here.
      Castries.$191 per passenger.Departing Mon, 28 Dec.One-way flight with United.Outbound indirect flight with United, departs from Boston Logan International on Mon, 28 Dec, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $191, select.
      Castries.$203 per passenger.Departing Tue, 17 Nov.One-way flight with Delta.Outbound indirect flight with Delta, departs from Boston Logan International on Tue, 17 Nov, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $203, select.
      Castries.$234 per passenger.Departing Fri, 15 Jan.One-way flight with United.Outbound indirect flight with United, departs from Boston Logan International on Fri, 15 Jan, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $234, select.
      Castries.$235 per passenger.Departing Sat, 31 Oct.One-way flight with United.Outbound indirect flight with United, departs from Boston Logan International on Sat, 31 Oct, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $235, select.
      Castries.$290 per passenger.Departing Tue, 23 Mar.One-way flight with Delta.Outbound indirect flight with Delta, departs from Boston Logan International on Tue, 23 Mar, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $290, select.
      Castries.$395 per passenger.Departing Sun, 2 May.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on Sun, 2 May, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $395, select.
      Castries.$396 per passenger.Departing Sat, 3 Apr.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on Sat, 3 Apr, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $396, select.
      Castries.$415 per passenger.Departing Sat, 13 Feb.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Boston Logan International on Sat, 13 Feb, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $415, select.
      Castries.$727 per passenger.Departing Sat, 30 Jan.One-way flight with jetBlue.Outbound direct flight with jetBlue departs from Boston Logan International on Sat, 30 Jan, arriving in St Lucia Hewanorra.Price includes taxes and charges.From $727, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Boston to Castries found in the last 4 days, and are subject to change and availability.

      Find the cheapest month to fly from Boston to Castries

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Boston to Castries flights are currently cheapest in December.
      Oct
      from $235
      Nov
      from $203
      Dec
      from $191
      Jan
      from $234
      Feb
      from $415
      Mar
      from $290
      Apr
      from $396
      May
      from $395
      Jun
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      Jul
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      Aug
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      Sep
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      Direct flights from Boston to Castries

      jetBlue

      Alternative Boston to Castries routes

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

      St Lucia Vigie

      1km from central Castries
      Closest
      from $584
      Search flights

      St Lucia Hewanorra

      30km from central Castries
      Cheapest
      from $191
      Search flights

      Boston to Castries: Flight information

      The things to know before you go.
      Cheapest flight found$191
      Cheapest month to flyDecember
      Average flight time4 hrs, 52 mins
      Most popular airlinejetBlue
      Average flights per week8

      Finding cheap flights from Boston 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 to Castries is $521. 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 52 minutes is the average flight time from Boston to Castries.
      jetBlue flies direct from Boston to Castries.
      As of October 2026, there are 2 flights per week flying from Boston to Castries.
      The cheapest month to fly from Boston to Castries is usually November.
      If you're flying from Boston, the cheapest airport near Castries is St Lucia Hewanorra – which is 30.4 km away from the centre of Castries. We've found flights into this airport from $521.
      After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Boston to Castries on Sunday, 22 November 2026.
      Yes – the average flight time is 4 hours and 52 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 October, the average temperature is usually around 28°C. September is typically the warmest month in Castries, when it usually averages around 30°C. You can expect the least rain in March. The coldest month is February, with temperatures averaging 24°C. The rainiest month is August.
      The cheapest airline that flies to Castries is Air Canada .

      How to find cheap flights from Boston to Castries

      Looking for cheap air tickets from Boston to Castries? Here are a few tips on how to score the best price and make your journey as smooth as possible.

      • Simply hit 'search'. From Singapore Airlines to Emirates, we've compared plane tickets from all major online travel agents and airlines flying Boston-Castries to find the cheapest flights. And with us, there are no hidden fees – what you see is what you pay.
      • Flex your dates to secure the best air ticket price for your Boston-Castries flight. If your travel dates are flexible, use Skyscanner's "Whole month" tool to find the cheapest time to fly toCastries from Boston.
      • Stay One Step Ahead with Price Alerts. Never miss a deal! Set up a Price Alert for Boston to Castries by creating an alert. Whenever prices go down or up, you'll get a push notification or email to help you get the best flight deal.
      • Look for direct flights. Only interested in direct flights between Boston and Castries? Make sure to tick "Direct flights only" when performing a search. If there are direct flights available, these will appear in the results.
      • Include nearby airports in your search. Widen your search for Boston to Castries flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save on your next trip.
      • Find the cheapest Business Class flights from Boston to Castries. We scour the Internet for the best Business, Premium Economy, and First Class flight fares for Boston-Castries, too. Check the difference in price as you search – you might just stumble on a last-minute low fare.
      • Search for cheap flights when out and about. To get the best flight booking experience on the go, download our app and search for flight tickets from Boston to Castries wherever you are.

      Book air tickets from Boston to Castries with peace of mind

      • Find flexible flights for Boston to Castries Your airline might be offering flexible plane tickets to Castries, which means you won't lose out if your flight has to be changed or cancelled.
      • Add travel cost protection. Avoid travel pitfalls and choose travel cost protection - it's available at the checkout as you book your Boston-Castries flight with us.
      • Reduce your carbon footprint by selecting a greener Boston-Castries flight option. To check whether there are any lower emissions flights available on your route, simply check the “only show flights with lower CO₂ emissions” box which will be available once you have moved on from this page.

      Combine your flight to Castries with hotels and car rental

      Once you've secured your cheap flight ticket for Boston-Castries, discover the best prices and exclusive rates for hotels in Castries or nearby. You can also compare hundreds of car rental companies at once so you get the best car rental price for your trip..

      Not Sure About Castries? Explore “Everywhere”

      If you're still exploring destinations, use Skyscanner’s “Everywhere” search feature to see the cheapest places to fly from your location. You might just find an irresistible deal to Castries or another dream destination.


      Plan the rest of your trip from Boston to Castries

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.