BOS - SLU

$902 Find Cheap Flights from Boston to Castries

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Castries departing on 11/5. 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
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Everything you should know

Cheapest round-trip
$882
Typical prices: $635-$514
Multiple Airlines
Thu 11/5Mon 11/9
BOS - SLU • 2 stops
When to travel
July
Cheapest • 100% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Thu, Nov 5 - Mon, Nov 9
Multiple Airlines Logo
5:30 am - 7:00 pm
BOS
-
SLU
12h 30m
2 stops
Multiple Airlines Logo
12:35 pm - 9:37 am
SLU
-
BOS
22h 02m
2 stops
$882Multiple Airlines
Mon, Sep 21 - Thu, Sep 24
Multiple Airlines Logo
6:00 am - 7:00 pm
BOS
-
SLU
13h 00m
2 stops
Multiple Airlines Logo
3:45 pm - 9:55 am
SLU
-
BOS
42h 10m
2 stops
$902Multiple Airlines
Tue, Sep 1 - Sat, Sep 5
Multiple Airlines Logo
7:15 pm - 7:00 pm
BOS
-
SLU
23h 45m
2 stops
Multiple Airlines Logo
12:35 pm - 9:53 am
SLU
-
BOS
21h 18m
2 stops
$903Multiple Airlines
Sun, Jun 21 - Thu, Jun 25
Multiple Airlines Logo
5:10 am - 7:00 pm
BOS
-
SLU
13h 50m
2 stops
Multiple Airlines Logo
3:45 pm - 4:08 pm
SLU
-
BOS
48h 23m
2 stops
$915Multiple Airlines
Mon, Nov 23 - Sun, Nov 29
Multiple Airlines Logo
5:30 am - 7:00 pm
BOS
-
SLU
12h 30m
2 stops
Multiple Airlines Logo
12:35 pm - 9:37 am
SLU
-
BOS
22h 02m
2 stops
$929Multiple Airlines
Sat, Jul 4 - Sat, Jul 11
Multiple Airlines Logo
7:15 pm - 7:00 pm
BOS
-
SLU
23h 45m
2 stops
Multiple Airlines Logo
12:35 pm - 9:53 am
SLU
-
BOS
21h 18m
2 stops
$936Multiple Airlines
Sun, Nov 1 - Thu, Nov 5
Multiple Airlines Logo
5:30 am - 7:00 pm
BOS
-
SLU
12h 30m
2 stops
Multiple Airlines Logo
12:35 pm - 9:37 am
SLU
-
BOS
22h 02m
2 stops
$951Multiple Airlines
Thu, Nov 5 - Mon, Nov 9
Multiple Airlines Logo
12:55 pm - 7:00 pm
BOS
-
SLU
29h 05m
2 stops
Multiple Airlines Logo
9:10 am - 1:55 pm
SLU
-
BOS
29h 45m
3 stops
$953Multiple Airlines
Wed, Nov 4 - Wed, Nov 11
Multiple Airlines Logo
7:25 pm - 7:00 pm
BOS
-
SLU
22h 35m
2 stops
Multiple Airlines Logo
12:35 pm - 9:57 am
SLU
-
BOS
22h 22m
2 stops
$960Multiple Airlines
Tue, Nov 24 - Tue, Dec 8
Multiple Airlines Logo
7:25 pm - 7:00 pm
BOS
-
SLU
22h 35m
2 stops
Multiple Airlines Logo
12:35 pm - 9:57 am
SLU
-
BOS
22h 22m
2 stops
$962Multiple 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 November.

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 July, where tickets cost $0 (return) on average. On the other hand, the most expensive months are April and June, where the average cost of round-trip tickets is $934 and $832 respectively.

Find deals

Good to know

Low seasonAugust
Cheapest flight$882
Best time to beat the crowds with an average 39% 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 5 days, the lowest price for a flight from Boston to Castries was $902 for a round-trip ticket.

  • 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.

  • 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 airline 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.
7.1
JetBlueOverall score based on 2977 reviews
6.6Food
7.3Boarding
7.5Comfort
7.2Entertainment
7.9Crew
Airline reviews

The flight was delayed for more than 3 hours the flight attendant was so angry, it was my first flight with JetBlue but i don’t think I flight with them again.

2.0 MediocreAndre, Jun 2026
SEA - JFK
Read more JetBlue reviews

The flight was delayed for more than 3 hours the flight attendant was so angry, it was my first flight with JetBlue but i don’t think I flight with them again.

First the flt was delayed over 2 hrs bc of plane mechanics that should have been handled better! No text or email was sent so only found out at the airport so there we sat for 5 hours! THATS RIDICULOUS! The gate area was filthy! No agents showed up till hr before so no additional info was given-waited online for 15 mins while the gate agent chatted and got together then given last seat in back of plane!! No priority for senior or anything-took attendants over 2hrs to serve drinks and snack-WHY are they not served together? By time snack came needed another drink! Worst service in my life!

Since we started at syr the service, crews, and flights were just excellent

All the TV screens in my rows was non functional . The map shown for an international route was antiqued..

It was fine for what it was. It’s not luxury travel but it was efficient, for the most part. Having my carry-on transferred into luggage however, was unwelcome.

We had better-than-average leg room and I loved the access to shows and movies. During boarding, we could not hear the agent even though we were close to the boarding door, which was kind of scary when we realized that half of the passengers had already boarded. Also, the entertainment was awesome, but I could not hear the movie as well as I would have liked, because my headphones were crappy. It would have been better if I could connect my own ear buds via Bluetooth or if JetBlue provided headphones.

On time, friendly attendants, quick wheelchair assistance and help checking in bags. Also appreciated change in seats, more forward to make it easier for my 97 year old mother to board and exit the plane. Thank you, JetBlue!

Flight did not have onboard charging and TV screen flickering.

I was seated next to an autistic child who was out of control and had a child behind me kicking my seat for most of the trip. I will never fly JetBlue again. Ever. I don't care how cheap it is. It's terrible.

Boarding process was terrible. No assigned seat until the gate, then a long line to get seat assignment.

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

Information on your arrival and departure airports

Boston (BOS)
Castries (SLU)