Cheap Flights from Boston to Castries from US$146

Frequently Asked Questions

• What are the cheapest flights from Boston to Castries (BOS-SLU)?

  Based on Trip.com data, American Airlines offers one-way fares as low as US$146 on Cheapest nonstop routes (e.g. BOS to UVF on Sat, Aug 22), while American Airlines offers Cheapest nonstop round-trips from US$401 departing on Fri, Sep 11 and returning on Thu, Sep 17.

• Which airlines offer direct flights from Boston to Castries?

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

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

  Based on Trip.com data in the past 4 weeks, there is 1 flight per week flying from Boston to Castries. You can check the weekly schedule for popular airlines on this route below: Jetblue Airways: -/-/-/-/-/F/- -- B6363 (09:47)

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

  To find best deals on flights from Boston 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 Sat, Aug 22, with one-way flights priced at just US$146.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is American Airlines.
  · 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 August.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Boston (BOS) to Castries (SLU) the cheapest?

  The cheapest months to fly from Boston to Castries is October, when demand for travel is lower.

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

  After crunching the numbers on our August flight calendar, it's currently cheapest to fly from Boston to Castries on August 21, 2026 with American Airlines, with prices starting at US$146.

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

  You can land at any one of the following hubs in Castries, with Boston Logan International Airport to Hewanorra International Airport (BOS-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 Boston and Castries?

  The time difference between Castries and Boston is 1h.

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

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Boston to Castries is US$295. Fares vary by travel date, airline and availability.

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

  Enter Boston 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.