What is the cheapest day to fly from Boston to Castries?

Travelers seeking maximum savings on their Boston to Castries flight should consider departing on Wednesday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from Boston to Castries?

Tuesday is generally a great day to depart. Flying on this day could help you save up to 45%.

How far in advance should I book a flight from Boston to Castries?

To save up to 395% on this flight, we recommend booking at least 35 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Boston to Castries from $517 1-2 weeks out and tickets from $797 for flights departing within the next 72 hours.

What is the cheapest month to fly from Boston to Castries?

The best pricing can be found in the month of September. Prices to Castries from Boston average $646. You can even find prices in September for less than $646, as users have found deals to Castries from as low as $415. The month of July appears to be one of the more expensive times to travel to Castries from Boston. Flying in the targeted month can save you up to 33%.

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.

$331+ Flights from Boston to Castries

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Cheap flight deals from Boston to Castries

Round-trip from	$757 (Mytrip)
One-way from	$331 (Mytrip)
Popular in	July
Cheapest in	September
Average price	$745
Good round-trip deal	$830 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. 12% potential increase in price ($90 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).

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Average for round-trip flights in June 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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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 junio 12, 2025.

vie. 10/36:10 amBOS - SLU

2 stops31h 00mMultiple Airlines

dom. 10/512:30 pmSLU - BOS

3 stops29h 48mMultiple Airlines

Deal found 6/9

$757

Best flights from Boston to Castries
Discover carefully curated flight deals from Boston to Castries that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated junio 12, 2025.

vie. 10/36:10 amBOS - SLU

2 stops31h 00mMultiple Airlines

dom. 10/512:30 pmSLU - BOS

3 stops29h 48mMultiple Airlines

Deal found 6/9

$757

Last-minute flights from Boston to Castries
Discover last-minute flight deals from Boston to Castries. Data last updated junio 12, 2025 and is based on user searches.

jue. 6/196:15 amBOS - SLU

2 stops29h 15mMultiple Airlines

dom. 6/225:00 amSLU - BOS

2 stops34h 37mMultiple Airlines

Deal found 6/10

$1,209

mar. 6/2410:20 amBOS - SLU

3 stops32h 40mMultiple Airlines

dom. 6/295:00 amSLU - BOS

2 stops30h 28mMultiple Airlines

Deal found 6/10

$841

One-way flights from Boston to Castries
Search for one-way flight options from Boston to Castries. Find affordable one-way fares based on user searches. Data last updated junio 12, 2025.

sáb. 6/216:00 amBOS - SLU

2 stops29h 25mMultiple Airlines

Deal found 6/11

$331

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Castries that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

jue. 9/4

4:15 pm-11:30 am

2 stops19h 15m

Castries George F. L. Charle

dom. 9/7

5:00 am-12:39 am

2 stops19h 39m

$811

BostonCastries

BOS - SLU

BOSSLU

Boston Logan Intl

sáb. 6/21

6:00 am-11:25 am

2 stops29h 25m

$331

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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

How far ahead should I book a flight from Boston to Castries?

To ensure you get the cheapest price possible for a flight from Boston to Castries, you should look to book at least 34 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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?

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.

Related info for your journey

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.

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Alternative routes for Boston to Castries

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Top 2 airlines flying from Boston to Castries

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest$406	Average$667	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$412	Average$602	FlexibilityNo cancel fee	On-time71%

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$331+ 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 6/21. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boston to Castries with Cheapflights

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Cheap flight deals from Boston to Castries

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Find flight deals from Boston to Castries

Cheapest flights from Boston to CastriesExplore 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 junio 12, 2025.

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 junio 12, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Castries that are best for you.

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.

Cheapflights Insights

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

How far ahead should I book a flight from Boston to Castries?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Castries. Price data was last updated on June 9, 2025.

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

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 junio 12, 2025.

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.

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

How can I find direct flights from Boston to Castries?

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

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

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Alternative routes for Boston to Castries

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Top 2 airlines flying from Boston to Castries

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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 junio 12, 2025.