BOS - SLU

$391 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 3/7. 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
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$776
Overall average: $614
Multiple Airlines
Sun 3/1Tue 3/10
BOS - SLU • 2 stops
Cheapest one-way
$391
Multiple Airlines
Sat 3/7
BOS - SLU • 1 stop
When to travel
August
Cheapest • 41% price drop
February
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Sun, Mar 1 - Tue, Mar 10
Multiple Airlines Logo
10:45 am - 6:25 pm
BOS
-
SLU
30h 40m
2 stops
Multiple Airlines Logo
7:10 pm - 11:59 pm
SLU
-
BOS
28h 49m
2 stops
$776Multiple Airlines
Sun, Mar 1 - Tue, Mar 10
Multiple Airlines Logo
4:22 pm - 3:35 pm
BOS
-
SLU
46h 13m
3 stops
Multiple Airlines Logo
7:10 pm - 11:59 pm
SLU
-
BOS
28h 49m
2 stops
$797Multiple Airlines
Sun, Mar 1 - Tue, Mar 10
Multiple Airlines Logo
4:22 pm - 3:35 pm
BOS
-
SLU
46h 13m
3 stops
Multiple Airlines Logo
4:20 pm - 11:59 pm
SLU
-
BOS
31h 39m
3 stops
$819Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
5:27 am - 3:35 pm
BOS
-
SLU
33h 08m
2 stops
Multiple Airlines Logo
4:20 pm - 11:59 pm
SLU
-
BOS
31h 39m
3 stops
$821Multiple Airlines
Sun, Mar 22 - Sat, Mar 28
Multiple Airlines Logo
5:45 am - 3:35 pm
BOS
-
SLU
33h 50m
2 stops
Multiple Airlines Logo
5:50 pm - 11:59 pm
SLU
-
BOS
30h 09m
2 stops
$978Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
1:00 pm - 3:35 pm
BOS
-
SLU
25h 35m
2 stops
Multiple Airlines Logo
4:20 pm - 11:59 pm
SLU
-
BOS
31h 39m
3 stops
$994Multiple Airlines
Sat, Apr 11 - Sat, Apr 18
Multiple Airlines Logo
3:30 pm - 7:00 pm
BOS
-
SLU
27h 30m
3 stops
Multiple Airlines Logo
5:50 pm - 10:04 pm
SLU
-
BOS
28h 14m
3 stops
$995Multiple Airlines
Sat, Apr 11 - Sat, Apr 18
Multiple Airlines Logo
6:01 am - 10:10 pm
BOS
-
SLU
16h 09m
2 stops
Multiple Airlines Logo
5:50 pm - 10:04 pm
SLU
-
BOS
28h 14m
3 stops
$999Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
4:35 pm - 12:05 pm
BOS
-
SLU
18h 30m
3 stops
Multiple Airlines Logo
4:20 pm - 11:59 pm
SLU
-
BOS
31h 39m
3 stops
$1,003Multiple Airlines
Sun, Mar 22 - Sat, Mar 28
Multiple Airlines Logo
5:45 am - 3:35 pm
BOS
-
SLU
33h 50m
2 stops
Multiple Airlines Logo
3:45 pm - 11:59 pm
SLU
-
BOS
32h 14m
3 stops
$1,128Multiple 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.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to Castries, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boston to Castries is August, where tickets cost $382 (return) on average. On the other hand, the most expensive months are April and July, where the average cost of round-trip tickets is $995 and $938 respectively.

Good to know

Low seasonAugust
Cheapest flight$391
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly and prices are also 6% 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 $391 for a one-way ticket and $776 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 $607 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 $692 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 11218 reviews
7.2Comfort
6.4Food
6.9Entertainment
7.5Boarding
8.0Crew
Airline reviews

The screens were inoperable for movies and such, but everything else was just fine

10.0 ExcellentBenn, Feb 2026
HNL - DFW
Read more American Airlines reviews

The screens were inoperable for movies and such, but everything else was just fine

For a 5 1/2 hour flite i considered the "business class" to be subpar. The seats were just ok, no amenities, really nothing more than a long domestic flight. Frankly disappointed.

Delayed an hour due to operational issues. Minimal apologies or care for the significant inconvenience caused. Landed at nearly 1am and they still couldn’t find ground staff to get us off the plane promptly.

This was one of the most frustrating travel experiences I've had to date. I had changed my flight day of to this one as it was slated to depart on time. It ended up being so delayed that my original flight took off before this one did. The boarding process began but eventually stopped and everyone had to get off the plane as a problem was identified. The person at the front desk just tried to laugh it off as if this wasn't already a huge inconvenience. From there, we eventually got to board only to sit at the gate for an additional hour because of some additional issue. This was extremely frustrating and caused a lot of stress.

Update to handle the delay was very bad, crews no smiles or welcome or thanks. Don’t care attitude

It would be nice to have some low carb options in the snacks.

I was trying to take 2 one and a half hour one way trips and I experienced almost 20 delays over the course of those two trips. Only a few of them were due to weather the rest was disorganization

No gates avail at DFW so our incoming had to wait 30 mins for a plane to push back because they Had mechanical. We boarded 90 mins delayed and then we had a mechanical. Come on American…do better. Also at my seat the tray table had not been cleaned. Floor had not been cleaned. But captain and flight Att were very picture and apologetic.

Crew was helpful and cheerful especially when they had no refreshments to work with. The plane was never serviced and had nothing but limited water and coffee onboard. For the price point, a concern of services.

Flight was smooth, quick and felt safe. The 2 delays not happening would have been better but I guess that happens in the airline industry

Because of weather and mechanical issues our flight was 4 hours late. The only compensation offered to us was a meal voucher to be used only at Boston Airport and only on the day issued. But by the time it was offered to us all the restaurants were closed, so there was no way to use that offer.

Friendly crew, efficient boarding and flight arrived early. Couldn’t ask for a better experience

Terrible. They canceled our early morning flight after midnight on the day of and had no available flights to rebook my family on for the next 72 hours. Yet they still had other flights that were not cancelled from JFK so it couldn’t be based on the weather. It felt like they canceled the flight based on it not being profitable enough for them. I am not interested in traveling with the again. The absolute worse customer service and lack of accountability.

Horribly rude check in at airport, worst in 25 years of flying. All over a simple issue they could have googled to resolve.

First time flying with JetBlue and never again. I went to the counter to request meet and assist because I'm 74 and my wife is 79. I walk with a cane and my wife is handicapped and has her own wheel chair. I told the agent that my wife and luggage was at the entrance door. The ticketing agent said to me that they don't offer meet and assist. I need to bring them our luggage and then go back and get my wife in order to get my boarding pass. As I went back to get my luggage a Southwest agent along with a TSA agent recognized the situation and came over and took my wife and luggage to the JetBlue ticketing counter alongside the line and told the JetBlue agent to issue to take our luggage as soon as they could.

Flight was fine, price was good but food onboard was abysmal. I was on there for breakfast and lunch and dinner 845am EST to 845pm GMT and all I got was a yoghurt parfait, fruit and a piece of cake. Later snacks included an ice-cream brownie and a pizza twist. I was hungry by the time I landed and the airport amenities were closed. Not happy.

1) No pilot available for 1 hour 2) no room for most passengers careyon in overhead—-> stowed below 3) when we landed we had to wait 45 min. Before docking at gate as gate was not ready

Good. No issues except a slight delay. Crew came in late.

Not a pleasant experience, service was poor. Didn't like it

It was good. I prefer JB over other airlines.I just wish we had headphones for the films, but other than that - good.

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

Information on your arrival and departure airports