BOS - SLU

$625 Find Cheap Flights from Boston to Castries

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Castries departing on 2/14. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Castries

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Castries, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Castries, as well as popular online travel agencies
Travelers love KAYAK
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Everything you should know

Cheapest round-trip
$811
Typical prices: $515-$832
Multiple Airlines
Fri 1/30Thu 2/5
BOS - SLU • 2 stops
Cheapest one-way
$625
Multiple Airlines
Sat 2/14
BOS - SLU • 3 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Castries!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boston to Castries (BOS-SLU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Castries that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to Castries

Fri, Jan 30 - Thu, Feb 5
Multiple Airlines Logo
7:00 am - 1:10 pm
BOS
-
SLU
29h 10m2 stops
Multiple Airlines Logo
6:20 pm - 11:19 pm
SLU
-
BOS
29h 59m2 stops
$811Multiple Airlines
Fri, Jan 30 - Thu, Feb 5
Multiple Airlines Logo
7:00 am - 1:10 pm
BOS
-
SLU
29h 10m2 stops
Multiple Airlines Logo
6:20 pm - 11:57 pm
SLU
-
BOS
30h 37m3 stops
$832Multiple Airlines
Sat, Feb 21 - Sun, Mar 1
Multiple Airlines Logo
5:27 am - 3:15 pm
BOS
-
SLU
32h 48m2 stops
Multiple Airlines Logo
7:10 pm - 11:57 pm
SLU
-
BOS
29h 47m2 stops
$923Multiple Airlines
Thu, Feb 26 - Thu, Mar 5
Multiple Airlines Logo
4:22 pm - 1:10 pm
BOS
-
SLU
43h 48m3 stops
Multiple Airlines Logo
6:20 pm - 10:01 pm
SLU
-
BOS
28h 41m3 stops
$973Multiple Airlines
Sat, Feb 21 - Sat, Feb 28
Multiple Airlines Logo
4:35 pm - 3:15 pm
BOS
-
SLU
21h 40m3 stops
Multiple Airlines Logo
6:20 pm - 11:59 pm
SLU
-
BOS
30h 39m2 stops
$994Multiple Airlines
Wed, Feb 25 - Wed, Mar 4
Multiple Airlines Logo
3:30 pm - 1:10 pm
BOS
-
SLU
20h 40m3 stops
Multiple Airlines Logo
10:15 am - 2:38 pm
SLU
-
BOS
29h 23m3 stops
$1,016Multiple Airlines
Sat, Feb 21 - Sat, Feb 28
Multiple Airlines Logo
5:30 am - 3:15 pm
BOS
-
SLU
32h 45m3 stops
Multiple Airlines Logo
6:20 pm - 11:59 pm
SLU
-
BOS
30h 39m2 stops
$1,018Multiple Airlines
Wed, Feb 25 - Wed, Mar 4
Multiple Airlines Logo
1:00 pm - 1:10 pm
BOS
-
SLU
23h 10m2 stops
Multiple Airlines Logo
10:15 am - 2:38 pm
SLU
-
BOS
29h 23m3 stops
$1,059Multiple Airlines
Sat, Feb 21 - Sun, Mar 1
Multiple Airlines Logo
5:30 am - 3:15 pm
BOS
-
SLU
32h 45m3 stops
Multiple Airlines Logo
7:10 pm - 12:12 pm
SLU
-
BOS
18h 02m2 stops
$1,068Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
1:00 pm - 3:35 pm
BOS
-
SLU
25h 35m2 stops
Multiple Airlines Logo
7:10 pm - 12:12 pm
SLU
-
BOS
18h 02m2 stops
$1,076Multiple Airlines
Booking Insights

KAYAK's insights & trends for Boston to Castries flights

Get data-powered insights and trends into flights from Boston to Castries to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Boston to Castries?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boston to Castries departing in January.

Good to know

Low seasonMarch
Cheapest flight$625
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Boston to Castries

When to book flights from Boston to Castries

Are your dates flexible? Find out the best times to travel from Boston to Castries based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boston to Castries

  • What is the cheapest flight from Boston to Castries?

    In the last 3 days, the lowest price for a flight from Boston to Castries was $625 for a one-way ticket and $811 for a round-trip.

  • Do I need a passport to fly between Boston and Castries?

    Yes

  • Which aircraft models fly most regularly from Boston to Castries?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to Castries?

    oneworld is the only airline alliance operating flights between Boston and Castries.

  • Which is the best airline for flights from Boston to Castries, JetBlue or American Airlines?

    The two airlines most popular with KAYAK users for flights from Boston to Castries are JetBlue and American Airlines. With an average price for the route of $672 and an overall rating of 7.2, JetBlue is the most popular choice. American Airlines is also a great choice for the route, with an average price of $607 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Boston to Castries?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Castries.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Castries?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Castries from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Castries?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Castries with an airline and back to Boston with another airline. Booking your flights between Boston and SLU can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Castries?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Castries from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Boston to Castries

 
See real verified KAYAK customer reviews for airlines flying from Boston to Castries. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Castries? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
American AirlinesOverall score based on 11055 reviews
7.2Comfort
8.0Crew
6.9Entertainment
6.5Food
7.5Boarding
Airline reviews

Experience was good, however I had a delay due to weather happening and had to re purchase a seat on a new plane for a higher price (could be my own issue and misunderstanding) but other than that situation. First time flyer (by myself) was terrific!! The last from ORD to ALO didn't have wifi, but it was only 45 minutes so I'm sure that was part of the reason. Overall my experience was great! Next time I will remember to buy tickets with longer layovers. The delays really saved my overall anxiety. :)

8.0 ExcellentAustin, Dec 2025
ECP - CLT
Read more American Airlines reviews

Experience was good, however I had a delay due to weather happening and had to re purchase a seat on a new plane for a higher price (could be my own issue and misunderstanding) but other than that situation. First time flyer (by myself) was terrific!! The last from ORD to ALO didn't have wifi, but it was only 45 minutes so I'm sure that was part of the reason. Overall my experience was great! Next time I will remember to buy tickets with longer layovers. The delays really saved my overall anxiety. :)

Flight was delayed 17 hours due to aircraft issues. American did provide hotel, transportation and meals, 3 hours past boarding time, but it took us another hour to get the vouchers.

Flight was on time is the only good thing. Person loading the plane called 1-6 to board at the same time, made it chaotic. Plane was too small for even putting backpacks in overhead. Seat for normal sized people were too small. The WIFI didn't work. When we landed had to wait because not enough ground crew.

Did not understand a single word the attendant said on the pa system. I was glad it was not an emergency.

Flight was late and boarding was confusing because gate changed and I didn’t get a notification

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Not comparable to Qatar Airways services on flights to Doha. Flight attendants provided basic services; I was never recognized by name or as an Executive Platinum member. Restrooms were not kept clean during the flight.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

The ride share experience in JFK is terrible. After traveling on a flight, then you need to take a subway to the last stop to get an uber or lyft. Unacceptable. Bad job JetBlue for permitting JFK and Port Authority to do this to your passengers.

Checking In on JetBlue site was impossible. It hung up on REAL ID. Even my Global Entry did not help. Luckily, on Kayak site it was a breeze. Entire flight the temperature was COLD! Otherwise the crew was great!

The flight was two hours late due to a computer fault and resulting maintenance. Nothing was offered as compensation beyond bottles of water during the time we were deplaned and waiting in the terminal.

Very pleasant flight attendants. Gate crew rather loud chatting with each other.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

There was a fowl odour coming from the lavatory the entire flight

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

No internet on a flight over three hours in this age is criminal. Staff inattentive and dismissive

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

Information on your arrival and departure airports