BOS - SLU

$406 Find Cheap Flights from Boston to Castries - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$843
Typical prices: $1,039-$1,398
Multiple Airlines
Wed 11/28Sun 12/9
BOS - SLU • 2 stops
Cheapest one-way
$406
Typical prices: $449-$449
Multiple Airlines
Wed 11/14
BOS - SLU • 2 stops
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Boston to Castries (BOS-SLU)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to Castries

Sat, Nov 28 - Wed, Dec 9
Multiple Airlines Logo
5:30 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
12h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 2:17 pmSLU  Castries George F. L. Charle-BOS Boston Logan Intl
26h 42m2 stops Bridgetown Grantley Adams Intl Toronto Pearson Intl
$843Multiple Airlines
Wed, Jan 13 - Mon, Jan 18
Multiple Airlines Logo
5:30 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
12h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
9:10 am - 9:48 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
25h 38m2 stops Bridgetown Grantley Adams Intl Montreal Pierre Elliott Trudeau Intl
$883Multiple Airlines
Sun, Feb 21 - Sun, Feb 28
Multiple Airlines Logo
5:30 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
12h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 6:59 pmSLU  Castries George F. L. Charle-BOS Boston Logan Intl
31h 24m2 stops Bridgetown Grantley Adams Intl Montreal Pierre Elliott Trudeau Intl
$885Multiple Airlines
Fri, Jan 15 - Mon, Jan 18
Multiple Airlines Logo
5:45 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
12h 15m2 stops Toronto Pearson Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
9:10 am - 9:48 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
25h 38m2 stops Bridgetown Grantley Adams Intl Montreal Pierre Elliott Trudeau Intl
$887Multiple Airlines
Sun, Oct 25 - Mon, Nov 2
Multiple Airlines Logo
5:30 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
13h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 10:22 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
22h 47m2 stops Bridgetown Grantley Adams Intl Toronto Pearson Intl
$888Multiple Airlines
Sat, Dec 12 - Tue, Dec 15
Multiple Airlines Logo
3:30 pm - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
26h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 10:17 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
22h 42m2 stops Bridgetown Grantley Adams Intl Toronto Pearson Intl
$891Multiple Airlines
Tue, Oct 20 - Tue, Oct 27
Multiple Airlines Logo
6:00 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
13h 00m2 stops Toronto Pearson Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 2:17 pmSLU  Castries George F. L. Charle-BOS Boston Logan Intl
25h 42m2 stops Bridgetown Grantley Adams Intl Toronto Pearson Intl
$896Multiple Airlines
Sat, Dec 5 - Sun, Dec 13
Multiple Airlines Logo
7:40 pm - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
22h 20m2 stops Toronto Pearson Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
9:10 am - 9:48 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
25h 38m2 stops Bridgetown Grantley Adams Intl Montreal Pierre Elliott Trudeau Intl
$896Multiple Airlines
Thu, Jan 28 - Sun, Jan 31
Multiple Airlines Logo
5:30 am - 7:00 pmBOS  Boston Logan Intl-SLU Castries George F. L. Charle
12h 30m2 stops Montreal Pierre Elliott Trudeau Intl Bridgetown Grantley Adams Intl
Multiple Airlines Logo
12:35 pm - 9:48 amSLU  Castries George F. L. Charle-BOS Boston Logan Intl
22h 13m2 stops Bridgetown Grantley Adams Intl Montreal Pierre Elliott Trudeau Intl
$897Multiple Airlines
Useful Info

Key details for Boston to Castries flights

Cheapest flight

$406
One-way 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

Your Boston to Castries flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Boston to Castries?

    Only Economy Class is available on flights from Boston to Castries.

  • Do I need a passport to fly from Boston to Castries?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • Have flight prices from Boston to Castries changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $843 to $4,172. That means the highest observed fare was about 5x higher than the lowest one.

  • How are flight prices from Boston to Castries looking right now?

    One-way fares from Boston to Castries are currently higher than usual. Average one-way flight prices are about $532, which is 18% above the typical average for this route.

  • What car rental options are available at Castries George F. L. Charle Airport (SLU)?

    Castries George F. L. Charle Airport (SLU) hosts 5 major car rental companies, with daily rates starting from around $14 for economy cars. Top options include:

    • Ace
    • Drive A Matic
    • Final Rentals
    • Sixt
    • Hertz

  • Which airports can I use when flying from Boston to Castries?

    Flights from Boston to Castries usually depart from Boston Logan Intl (BOS) and arrive at Castries George F. L. Charle (SLU).

  • Can I save money by using flexible dates for flights from Boston to Castries?

    Yes. Flexible dates can save you up to 26% on flights from Boston to Castries. Thursday is the cheapest departure day at $1,039 round-trip on average, while Friday is the most expensive at $1,398, a difference of $359.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Your guide to booking Boston to Castries flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Friday. On this route, Thursday flights average $1,039, about $359 less than Friday fares (26% savings) based on the last 12 months.
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Castries George F. L. Charle Airport.

    • Stolen Time St. Lucia
    • Sandals Regency La Toc

More options for your flight from Boston to Castries

Complete your trip to Castries with a hotel stay or car rental

Car rentals in Castries
Hotels in Castries