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BOS - SLU

$451 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 7/13. 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
Fri 6/14
Fri 6/21

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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 42,566,405 times on KAYAK, and here is why:

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Cheap flight deals from Boston to Castries (BOS-SLU)

 
These are the cheapest deals for flights from Boston to Castries currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Boston to Castries

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Boston to Castries.

Recent one-way flight deals from Boston to Castries

Only flying one-way? Below are some of the best one-way flight deals from Boston to Castries found on KAYAK recently.

Recent last minute flight deals from Boston to Castries

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Boston to Castries.

Recent direct flight deals from Boston to Castries

The latest deals for direct flights from Boston to Castries so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Boston to Castries

Find recent round-trip train or bus tickets from Boston to Castries.

All round-trip flight deals to Castries

The cheapest plane tickets to Castries found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
10:20 am - 7:00 pmBOS-SLU
32h 40m2 stops
7:30 am - 9:38 amSLU-BOS
26h 08m3 stops
Sat, Jun 15 - Tue, Jun 18
4:05 pm - 7:00 pmBOS-SLU
26h 55m2 stops
7:30 am - 9:29 amSLU-BOS
25h 59m2 stops
Sat, Jun 15 - Tue, Jun 18
6:10 am - 12:00 pmBOS-SLU
29h 50m3 stops
9:25 am - 9:38 amSLU-BOS
24h 13m3 stops
Wed, Jun 12 - Sat, Jun 15
6:10 pm - 7:00 pmBOS-SLU
24h 50m3 stops
7:30 am - 9:38 amSLU-BOS
26h 08m3 stops
Sat, Jun 15 - Tue, Jun 18
9:19 pm - 10:10 pmBOS-SLU
24h 51m3 stops
9:25 am - 10:55 amSLU-BOS
25h 30m3 stops
$1,102
Find Deal
Fri, Jun 21 - Sat, Jun 29
7:40 pm - 3:55 pmBOS-SLU
20h 15m2 stops
9:25 am - 10:55 amSLU-BOS
25h 30m3 stops
$1,179
Find Deal
Sun, Jun 23 - Sat, Jun 29
1:53 pm - 5:30 pmBOS-SLU
27h 37m3 stops
9:25 am - 10:55 amSLU-BOS
25h 30m3 stops
$1,196
Find Deal
Sun, Jun 23 - Sat, Jun 29
9:19 pm - 10:10 pmBOS-SLU
24h 51m3 stops
9:25 am - 9:29 amSLU-BOS
24h 04m2 stops
$1,241
Find Deal
Fri, Jun 21 - Sat, Jun 29
6:05 am - 7:00 pmBOS-SLU
12h 55m3 stops
5:00 am - 11:43 pmSLU-BOS
18h 43m3 stops
$1,302
Find Deal
Sat, Aug 31 - Sun, Sep 1
7:40 pm - 3:55 pmBOS-SLU
20h 15m2 stops
9:25 am - 9:29 amSLU-BOS
24h 04m2 stops
$1,320
Find Deal
Sun, Jun 23 - Sat, Jun 29
7:40 pm - 7:00 pmBOS-SLU
23h 20m2 stops
Sat, Jul 13
6:10 am - 11:30 amBOS-SLU
29h 20m2 stops
Thu, Jun 13
3:26 pm - 7:00 pmBOS-SLU
27h 34m3 stops
Thu, Jun 13

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.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Boston to Castries, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
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.

Good to know

Low season

August

High season

February

Cheapest flight

$451
Best time to beat the crowds but there is an average 26% increase in price.
Most popular time to fly and prices are also 5% 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 $451 for a one-way ticket and $875 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.

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 4483 reviews
7.2Food
7.8Boarding
8.3Crew
7.9Comfort
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.

Tray table was filthy when I sat down. I needed to have someone come clean it because there was food and stains on it WiFi didn’t work after paying for in flight WiFi Food was terrible and was not filling at all Chicken was rubbery Flight attendant had an attitude, interrupted me and wasn’t able to answer basic questions about the food selection such as “does the chicken have red sauce in it”. If your flight attendants are not going to know what is in the meals so we can make an educated decision based on dietary restrictions, they shouldn’t be on the plane. My 1.5 year old niece was sleeping and dropped her binkie. I went on the ground under the chairs looking for it. It was at that time that she came up to me as I’m CLEARLY on all 4s with a flashlight and said “I need to get by”. I said one moment please I’m getting something from under the seat (while my head was literally under the seat). Her reply was “no you need to move now” and proceeded to almost push me out of the way. I looked up and all I saw was her toes under my eyes. When I looked in front of me, her private parts were inches away from my face. I then made a comment “you couldn’t waited 2 seconds?” and her response was, “no I need to use the bathroom”. I understand that and would never want to be the reason someone couldn’t get to the bathroom but I was under the seat. She could’ve gone around the other way instead of harassing me, basically placing her private parts on my head and borderline pushing me out of the way. You don’t pay (especially this much) for this deplorable experience. This was by far the worst experience I have ever had on American. I will be absolutely thinking twice and thrice about flying American Airlines again. I would rather pay more to fly delta because at least I know their WiFi will work and their flight attendants won’t have a terrible attitude for no reason, nor will they act the way this woman did. Unacceptable.

Tray table was filthy when I sat down. I needed to have someone come clean it because there was food and stains on it WiFi didn’t work after paying for in-flight WiFi. Food was terrible and was not filling at all Chicken was rubbery Flight attendant had an attitude, interrupted me and wasn’t able to answer basic questions about the food selection such as “does the chicken have red sauce in it”. If your flight attendants are not going to know what is in the meals so we can make an educated decision based on dietary restrictions, they shouldn’t be on the plane. My 1.5 year old niece was sleeping and dropped her binkie. I went on the ground under the chairs looking for it. It was at that time that she came up to me as I’m CLEARLY on all 4s with a flashlight and said “I need to get by”. I said one moment please I’m getting something from under the seat (while my head was literally under the seat). Her reply was “no you need to move now” and proceeded to almost push me out of the way. I looked up and all I saw was her toes under my eyes. When I looked in front of me, her private parts were inches away from my face. I then made a comment “you couldn’t waited 2 seconds?” and her response was, “no I need to use the bathroom”. I understand that and would never want to be the reason someone couldn’t get to the bathroom but I was under the seat. She could’ve gone around the other way instead of harassing me, basically placing her private parts on my head and borderline pushing me out of the way. You don’t pay that much for this deplorable experience. This was by far the worst experience I have ever had on American. I will be absolutely thinking twice and thrice about flying American Airlines again. I would rather pay more to fly delta because at least I know their WiFi will work and their flight attendants won’t have a shitty attitude for no reason, nor will they act the way this woman did. Unacceptable.

Liked - nothing. Disliked - delayed 35+ min sitting on the plane. Caused me to miss my connection in Charlotte. American Airlines is the worst US Air Carrier company with atrocious customer service.

Worst situation ever! I booked my tickets for this trip on Alaska Airlines. I guess AA is a partner and we flew nonstop from Eugene to PHX on an AA jet. I had to pay for luggage from PHX to EUG. And this was an Alaska Airlines reservation paid for with Alaska airlines credit card! Got to the PHX airport and was not able to check bags because of some weird issue with the AA software. My reservation had to be the-entered by the agent. I will never pick another American Airlines flight on the Alaska Airlines website. While on vacation, I tried to upgrade our seats for the trip home. The request just buffered and never went through. I tried four times and was charged four times on my credit card. The card was charged but the seats were never changed. What a wreck!

Left from gate 30 minutes before flight. Never been late to a flight ever. It says 15 minutes before explicitly on the ticket.

I like the boarding process, it was fast. The seat doesn’t have a TV for a long flight and food wasn’t served, just snacks.

Use planes with TVs on flights over 4 hours. The free entertainment was a cheap in between solution for a very long flight that you don't even bother providing meals or decent snacks.

Even though we left CMI late, we mostly made up the time.

Delayed almost 4 hours for a 45 minute flight with no explanation.

Again, multiple delays and I eventually just canceled and drove!

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.
7/13Sat
2 stops
23h 20mBOS-SLU
$451
6/13Thu
2 stops
29h 20mBOS-SLU
$470
6/13Thu
3 stops
27h 34mBOS-SLU
$481

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Boston - Castries Flights

Departure:

Boston (undefined)United States

Destination:

Castries (SLU)Saint Lucia

Cabin classes:

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