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Castries

$657+ Cheap flights from Boston (BOS) to Castries (SLU)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SLU
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Boston to Castries

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Castries (SLU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 14, 2025.

Round-trip from

$885
(Mytrip)

One-way from

$657
(Booking.com)

Popular in

July

Cheapest in

March

Average price

$835

Good round-trip deal

$652 or less

Good one-way deal

$251 or less
From Boston Logan Intl to Castries George F. L. Charle
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One-way flight from Boston Logan Intl to Castries George F. L. Charle
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Highest demand for flights based on searches. 16% potential increase in price ($132 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Boston Logan Intl to Castries George F. L. Charle.
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Price to beat on a one-way flight from Boston Logan Intl to Castries George F. L. Charle.
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Find flight deals from Boston to Castries

Cheapest flights from Boston to Castries
Explore the most affordable flight options available from Boston to Castries. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Mytrip deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/112:18 pmBOS - SLU
2 stops21h 12mMultiple Airlines
Thu 9/186:20 pmSLU - BOS
3 stops29h 37mMultiple Airlines
Deal found 8/14$885
This Booking.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/264:45 pmBOS - SLU
2 stops20h 25mMultiple Airlines
Sun 9/2812:30 pmSLU - BOS
2 stops22h 59mMultiple Airlines
Deal found 8/13$1,410
This Mytrip deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/306:40 pmBOS - SLU
3 stops24h 20mMultiple Airlines
Tue 9/27:30 amSLU - BOS
3 stops26h 00mMultiple Airlines
Deal found 8/14$1,416
This Booking.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/186:55 pmBOS - SLU
2 stops16h 35mMultiple Airlines
Mon 9/224:35 pmSLU - BOS
2 stops23h 24mMultiple Airlines
Deal found 8/14$1,590
This Booking.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:00 amBOS - SLU
2 stops29h 25mMultiple Airlines
Sat 11/16:20 pmSLU - BOS
2 stops18h 52mMultiple Airlines
Deal found 8/14$2,699
This Expedia deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/226:15 amBOS - SLU
2 stops28h 30mMultiple Airlines
Sun 11/3012:30 pmSLU - BOS
2 stops46h 22mMultiple Airlines
Deal found 8/13$3,588
This Expedia deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:55 pmBOS - SLU
3 stops39h 35mMultiple Airlines
Sun 12/1412:30 pmSLU - BOS
3 stops46h 22mMultiple Airlines
Deal found 8/12$3,879
This Booking.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:15 amBOS - SLU
2 stops52h 10mMultiple Airlines
Sat 1/36:20 pmSLU - BOS
2 stops22h 37mMultiple Airlines
Deal found 8/13$3,916

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Castries that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Boston to Castries that are best for you.

Fly from

Boston

Fly to

Castries

Route

Depart

Return

Price

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Thu 9/11

2:18 pm-11:30 am

2 stops21h 12m

Castries George F. L. Charle

Thu 9/18

6:20 pm-11:57 pm

3 stops29h 37m

$885

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Fri 9/26

4:45 pm-1:10 pm

2 stops20h 25m

Castries George F. L. Charle

Sun 9/28

12:30 pm-11:29 am

2 stops22h 59m

$1,410

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Sat 8/30

6:40 pm-7:00 pm

3 stops24h 20m

Castries George F. L. Charle

Tue 9/2

7:30 am-9:30 am

3 stops26h 00m

$1,416

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Thu 9/18

6:55 pm-11:30 am

2 stops16h 35m

Castries George F. L. Charle

Mon 9/22

4:35 pm-3:59 pm

2 stops23h 24m

$1,590

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Sat 10/25

6:00 am-11:25 am

2 stops29h 25m

Castries George F. L. Charle

Sat 11/1

6:20 pm-1:12 pm

2 stops18h 52m

$2,699

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Sat 1/24

5:30 am-11:25 am

2 stops28h 55m

Castries George F. L. Charle

Sat 1/31

6:20 pm-6:02 pm

2 stops24h 42m

$3,091

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Sat 11/22

6:15 am-11:45 am

2 stops28h 30m

Castries George F. L. Charle

Sun 11/30

12:30 pm-9:52 am

3 stops46h 22m

$3,588

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

Fri 9/26

4:45 pm-1:10 pm

2 stops20h 25m

$657

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Best time to book a flight from Boston to Castries

Have a flexible travel schedule? Discover the best time to fly to Castries from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Castries

What is the cheapest month to book a flight from Boston to Castries?

Currently, August is the cheapest month in which you can book a flight from Boston to Castries (average of $525). Flying from Boston to Castries in July is currently the most expensive (average of $767). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to SLU?

Find hourly flight availability from Boston to Castries. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

It’s optimal to fly from Boston to Castries at noon. By choosing this option you can save up to 4% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Castries

Get insights into the airlines that provide service to Castries. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Castries. Reviews last updated August 14, 2025.
Read reviews from past customers who have flown American Airlines and JetBlue from Boston to Castries. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Crew

8.0

Comfort

7.2

Overall

7.2

Entertainment

6.9

Boarding

7.5

Food

6.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Crew

8.0

Comfort

7.2

Overall

7.2

Entertainment

6.9

Boarding

7.5

Food

6.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
JetBlue
7.2
Good
2,914 reviews
American Airlines
7.2
Good
10,000 reviews

Crew

8.0

Comfort

7.2

Overall

7.2

Entertainment

6.9

Boarding

7.5

Food

6.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.

Related info for your journey

Find useful and relevant information for your journey from Boston to Castries. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Boston to Castries round-trip?

    JetBlue, at $372, was found to be the cheapest airline from Boston to Castries. An alternate airline flying to your destination would be American Airlines. You may be able to fly from Boston to Castries for 44% less than the average price by searching for these airlines.

  • Can I find deals for flights from Boston to Castries that include hotel bookings?

    Yes. In addition to deals on Boston to Castries flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Castries?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Castries.

  • Can I find deals for business class flights from Boston to Castries?

    Yes. Cheapflights offers flight deals from Boston to Castries by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Castries?

    Currently, August is the cheapest month in which you can book a flight from Boston to Castries (average of $525). Flying from Boston to Castries in July is currently the most expensive (average of $767). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Castries?

Book flights to Castries if you plan to visit one of these locations
Gros Islet
Rodney Bay
Marigot Bay

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Alternative routes for Boston to Castries

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Castries flights
Hartford to Castries flights
Albany to Castries flights

Top 2 airlines flying from Boston to Castries

Discover the top 2 airlines that operate flights from Boston to Castries. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$372Average$669FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$449Average$605FlexibilityNo cancel feeOn-time71%

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