$150 Cheap Flights from Boston (BOS) to Castries (SLU)

You can find cheap one-way flights from $150 and cheap return flights $400 Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) with Expedia. One-way flights generally range between $176 and $702, and roundtrip flights usually range from $418 to $3016. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) ticket fares go up or down.

*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

January is the cheapest month to fly from Boston, MA (BOS) to Castries (SLU), with average round-trip fares around $445. This price is about 30% lower than the average fare throughout the year, as January is typically a quieter travel month. Other budget-friendly months include February and September.

*Averages based on flights available on Expedia in the last year.

Enter BOS to SLU and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

JetBlue Airways is one of the cheapest airlines offering connecting flights from Logan Intl. (BOS) to George F. L. Charles (SLU), with round-trip tickets starting from around $506. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

*Prices based on flights available on Expedia in the last year.

To find a cheap flight from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

The best airline to fly with from Boston, MA (BOS) to Castries (SLU) will differ from traveler to traveler. If you like to fly early, JetBlue Airways offers early morning flights. If price is the most important factor, JetBlue Airways typically offers the lowest fares. Air Canada offers the most daily flights from Boston to Castries, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

The best time to fly from Boston to Castries is typically in January or February. These months are the cheapest, with average return flight prices around $445. January and February are ideal because they fall outside the peak travel season, allowing you to enjoy lower fares while still experiencing pleasant weather in the Caribbean.

*Prices based on flights available on Expedia in the last year.

Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from BOS to SLU. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.

The most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) are from 6pm to 9pm. This time window represents about 30% of passenger traffic. Airlines such as American Airlines and Delta Airlines provide flights during this period. Evening departures are popular as they allow travelers to arrive in the Caribbean in the morning.

Flights from BOS to SLU with one stop typically take around 9 hours, covering approximately 2,048 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Business class seats are offered on the BOS to SLU route with Air Canada and JetBlue Airways.

It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

If you're planning to travel to Castries from Logan Intl. (BOS), you can fly into George F. L. Charles (SLU) Some flights may connect through major hubs like Ronald Reagan Washington National (DCA), Charlotte-Douglas Intl. (CLT), Philadelphia Intl. (PHL) before reaching Castries. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.