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BOS - SLU

Find cheap flights from Boston to Castries from $636

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 8/1. 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
0 bags
Mon 6/3
Mon 6/10

Search 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
In the last 7 days travelers have searched 43,693,958 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
3:36 pm - 12:00 pmBOS-SLU
20h 24m2 stops
5:00 am - 12:38 amSLU-BOS
19h 38m2 stops
$1,172
Find Deal
Wed, May 29 - Sun, Jun 2
3:36 pm - 12:00 pmBOS-SLU
20h 24m2 stops
5:00 am - 10:18 pmSLU-BOS
17h 18m3 stops
$1,326
Find Deal
Wed, May 29 - Sun, Jun 2
4:05 pm - 11:45 amBOS-SLU
19h 40m2 stops
5:00 am - 12:29 amSLU-BOS
19h 29m2 stops
$1,410
Find Deal
Sat, Jun 1 - Sun, Jun 9
7:40 pm - 11:30 amBOS-SLU
39h 50m3 stops
12:30 pm - 6:43 pmSLU-BOS
30h 13m3 stops
$1,728
Find Deal
Wed, May 29 - Sun, Jun 2
4:05 pm - 11:45 amBOS-SLU
19h 40m2 stops
10:25 am - 6:43 pmSLU-BOS
32h 18m2 stops
$1,734
Find Deal
Sat, Jun 1 - Wed, Jun 5
6:05 am - 11:45 amBOS-SLU
29h 40m3 stops
5:00 am - 9:29 amSLU-BOS
52h 29m3 stops
$1,781
Find Deal
Sat, Jul 13 - Sun, Jul 21
6:05 am - 11:45 amBOS-SLU
29h 40m2 stops
12:30 pm - 6:44 pmSLU-BOS
30h 14m2 stops
$1,797
Find Deal
Sat, Jul 13 - Sun, Jul 21
7:40 pm - 11:45 amBOS-SLU
40h 05m3 stops
4:35 pm - 9:25 amSLU-BOS
40h 50m2 stops
$2,446
Find Deal
Fri, May 24 - Mon, May 27

Flights from Boston to Castries - Travel Insights & Trends

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 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 September, where tickets cost $617 on average. On the other hand, the most expensive months are August and December, where the average cost of tickets is $1,046 and $999 respectively.

Good to know

Low season

May

High season

February

Cheapest flight

$636
Best time to beat the crowds but there is an average 5% increase in price.
Most popular time to fly and prices are also 12% 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 $636 for a one-way ticket and $1,172 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.

  • 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.

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

    To get a below average price on the flight from Boston to Castries, you should book around 2 days before departure. For the absolute cheapest price, our data suggests you should book 62 days before departure.

See more FAQs

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.
7.6
JetBlueOverall score based on 4552 reviews
8.3Crew
7.8Boarding
7.9Comfort
7.2Food
7.5Entertainment
Airline reviews

I had back trouble prior to my flight and everyone was great about helping me.

10.0 ExcellentMichelle, Mar 2024BOS - PHX
Read more about JetBlue reviews

I had back trouble prior to my flight and everyone was great about helping me.

My tv was broken on the flight which is disappointing when you pay for a seat and expect a service

Always delays from Boston to Salt lake but this time was very long. Don’t understand while they board the passengers and then make them sit in the plane

The boarding and flight were ok, but there were several painful issues. The flight was 3:20 in the air and almost four hours door to door, but they only had snack packs on the plane. They really need to have food on longer flights or make it clear to everyone that they won’t have food. They also advertise free WiFi, but it did not work for 90% of this flight. Again, almost four hours door to door. If I had known I was flying spirit for JetBlue prices then I would have planned differently.

Service for food to our seat was a bit slow. Snack choices were just pretzels or baked chips. My seat cushion was not attached. Other than Barbie, video choice were not very good or current.

After we landed, we were held on the plane for 30 minutes. There was no one at the gate once we landed and we forced to sit on a plan that had already over an hour delayed.

almost 4 hour delay as they over booked and had to wait for 8-10 volunteers to agree to travel next day.

Old plane. No outlets for laptop or phone. Seats worn out. Area around seat dirty.

I loved the flight and the crew. It was comfortable and smooth.

The crew was openly hostile and condescending to the customers. They spent the majority of that time in the rear talking and seemed really agitated when people asked questions. I heard five different people told that the information they requested was in the handout or safety brief.

All four American Airlines flights I took in last seven days were delayed. Caused me loads of problems, missed meetings, loss of time and money.

American cancelled our flight home. Zero option for hotel, alternative transportation and took 3 hours to find our bags so we could take a 3 hour UBER ride home on our dime. Never flying AA again.

They gave my seat away although it was a connecting flight with them and the flight was a bit delayed.

Flight was cancelled had to move to another gate late again no internet paid for the month and never can use it waste of money

Not being able to purchase my check in baggage online was a negative.

LATE LATE LATE!!! Plagued by late AA flights on this trip. Such a drag. This one was by far the worst.

WiFi connected but only let you go to the AA website, not even text messaging worked.

Too bad that first class seats do not recline significantly causing discomfort

I think the seats on some of their planes are uncomfortable. You can be ok on a short flight of two hours but no more than that. The delays, and also the refreshments on the plane were not enough.

Flight delayed over an over all day until it cancelled at 1:30am. Would not repeatedly delay that late. Offer hotel rooms and rebook early. Very difficult for families with small children

Book cheap flights from Boston to Castries

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Boston to Castries found on KAYAK in the last 72 hours.
8/1Thu
2 stops
34h 06mBOS-SLU
$636
8/1Thu
3 stops
25h 45mBOS-SLU
$751

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Boston - Castries Flights

Departure:

Boston (BOS)United States

Destination:

Castries (SLU)Saint Lucia

Cabin classes:

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