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C$352 Cheap Flights from Washington Dulles (IAD) to Castries (SLUA)

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Flight deals from Washington Dulles Airport to Castries

Looking for a cheap last-minute deal or the best return flight from Washington Dulles Airport to Castries? If you want to travel next month, return fares start from C$841. Find the lowest prices on one-way and return tickets right here.
Castries.C$352 per passenger.Departing Sat., Jun. 6.One-way flight with Porter Airlines.Outbound indirect flight with Porter Airlines, departs from Washington Dulles on Sat., Jun. 6, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$352, select.
Castries.C$399 per passenger.Departing Thu., Jul. 16.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Washington Dulles on Thu., Jul. 16, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$399, select.
Castries.C$474 per passenger.Departing Fri., May 29.One-way flight with United.Outbound indirect flight with United, departs from Washington Dulles on Fri., May 29, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$474, select.
Castries.C$527 per passenger.Departing Wed., Apr. 8.One-way flight with Porter Airlines.Outbound indirect flight with Porter Airlines, departs from Washington Dulles on Wed., Apr. 8, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$527, select.
Castries.C$541 per passenger.Departing Wed., Nov. 11.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Wed., Nov. 11, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$541, select.
Castries.C$541 per passenger.Departing Wed., Oct. 7.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Wed., Oct. 7, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$541, select.
Castries.C$586 per passenger.Departing Thu., Aug. 6.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu., Aug. 6, arriving in St Lucia Vigie.Price includes taxes and charges.From C$586, select.
Castries.C$1,123 per passenger.Departing Tue., Dec. 22.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Washington Dulles on Tue., Dec. 22, arriving in St Lucia Hewanorra.Price includes taxes and charges.From C$1,123, select.

Find the cheapest month to fly from Washington Dulles to Castries

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Castries flights are currently cheapest in June.
Mar.
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Apr.
from C$527
May
from C$474
Jun.
from C$352
Jul.
from C$399
Aug.
from C$586
Sep.
Find prices
Oct.
from C$541
Nov.
from C$541
Dec.
from C$1,123
Jan.
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Feb.
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Alternative Washington Dulles to Castries routes

Looking for the cheapest, fastest or easiest route from Washington Dulles to Castries? You could fly into the following airports instead.

St Lucia Vigie

1km from central Castries
Closest
from C$505
Search flights

St Lucia Hewanorra

31km from central Castries
Cheapest
from C$352
Search flights

Washington D.C. to Castries: Flight information

The things to know before you go.
Cheapest flight foundC$352
Cheapest month to flyJune

Finding cheap flights from Washington Dulles to Castries: Frequently asked questions

There are 2 airports in Castries: St Lucia Vigie and St Lucia Hewanorra.
The best price we found for a return flight from Washington Dulles to Castries is C$694. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Washington Dulles to Castries. But we found flights with one or more stops from C$694.
As of March 2026, there are no flights flying from Washington Dulles to Castries.
The cheapest month to fly from Washington Dulles to Castries is usually June.
If you're flying from Washington Dulles Airport, the cheapest airport near Castries is St Lucia Hewanorra – which is 30.5 km away from the centre of Castries. We've found flights into this airport from C$694.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Castries on Thursday, June 11, 2026.
No airlines currently offer direct flights between Washington Dulles Airport and Castries. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Castries but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Castries is around 40 days in advance, so don’t leave your flight to the last minute.
In March, the average temperature is usually around 26°C. September is typically the warmest month in Castries, when it usually averages around 28°C. You can expect the least rain in February. The coldest month is February, with temperatures averaging 25°C. The rainiest month is October.
Currently, Air Canada offers the cheapest flight tickets to Castries.

Flying from Washington Dulles International Airport (IAD) to Castries: what you need to know

  • Castries's timezone is UTC-4, which is the same as Washington DC (the location of Washington Dulles International Airport).

  • Leave enough time to get on your flight from IAD to Castries. As a general rule, arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Popular months like July or vacation periods such as Christmas and New Year will mean bigger queues at check-in and security. If you're travelling then, play it safe and get to the terminal even earlier. Arriving two hours before domestic flights and up four hours ahead of an international flight is a wise idea.

  • A stopover is the perfect opportunity to take a travel break — and perhaps even explore another city. When browsing flights from IAD to Castries, uncheck the 'Direct flights only' box to see where you can stop along the way. Top options include:

    • Grantley Adams International Airport (BGI)

    • Newark Liberty International Airport (EWR)

    • Hartsfield-Jackson Atlanta International Airport (ATL)

  • You won't need a visa for Saint Lucia if you hold a passport from United States and are travelling for tourism purposes. Visa and travel documentation requirements can change. So before booking your flight tickets from Washington Dulles International Airport to Castries, be sure to check with your airline and your destination country's local consulate or embassy for the latest information.

  • Located around 56 kilometres from central Washington DC, IAD can be reached in about 51 minutes by car (depending on traffic). The same journey on public transport takes roughly 3 hours and 26 minutes.

  • After an easy start to your vacation? Stay near IAD. Whether you're boarding an early flight from Washington Dulles International Airport to Castries or just don't want to be rushed, these hotels have you covered:

How to find the cheapest flights from Washington Dulles International Airport (IAD) to Castries

  • C$352 is the lowest price we've seen for a one-way ticket from Washington Dulles International Airport to Castries. For a return flight on this route, the best price is C$694. Depending on when you want to go and the availability, these fares can change.

  • It's usually best to book in advance if you want to get cheap tickets from IAD to Castries. That's because airlines adjust prices based on demand, which tends to rise closer to departure.

  • The 'Whole month' search function shows you the cheapest tickets from Washington Dulles International Airport to Castries throughout the entire month. It's a good way to snap up a bargain if your dates are flexible.

  • Sign into your online account or use the app to set up a Price Alert. We'll get in touch right away if there's a cheaper deal on this route. It's easy to do, and it'll save you from searching for cheap tickets from IAD to Castries every day.

  • Make the most of the filters to find your ideal trip. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Washington Dulles International Airport to Castries, use the 'Sort by' tool. You can also filter by arrival and departure times, airline, and number of stops.

Airports in Castries

Hewanorra Airport (UVF)

  • Hewanorra Airport (UVF) is around 56 kilometres from the centre of Castries. With your own car rental or if you take a cab, the drive is around 1 hour and 9 minutes.

  • If you're coming in on a late flight from Washington Dulles International Airport to Castries, nothing beats the convenience of staying close to the terminal. Collect your bags from the carousel and then be showered and snoozing not long after at one of these hotels near UVF:

George F. L. Charles Airport (SLU)

  • After your flight from Washington Dulles International Airport to Castries has touched down, you can make your way to the city centre in around 6 minutes by car. Central Castries is roughly 3 kilometres from George F. L. Charles Airport (SLU).

  • The journey will take roughly 40 minutes on public transport.

  • Hang up the 'Do not disturb' sign and rest at a hotel close to SLU. Here are a few options where you can kick back after your flight from IAD to Castries:

Best time to go to Castries

  • July is the busiest month for flights from Washington Dulles International Airport to Castries. To escape the crowds, head to Castries in May when things are quieter.

  • Lock in your flight from Washington Dulles International Airport to Castries for September to visit the city during its warmest month. You can expect temperatures to range from 26ºC to 30ºC.

  • February sees average temperatures of between 24ºC and 28ºC. Look for cheap flights from IAD to Castries around that time if you like travelling in cooler conditions.

More about Castries

  • Start your Castries trip off on the right foot by choosing the ideal place to stay. After booking your flight from Washington Dulles International Airport to Castries, check out our selection of hotels including:

  • Derek Walcott Square and Morne Fortune are just two of the big attractions to put on your Castries itinerary. Keep the sightseeing going at Immaculate Conception Church.

Complete your Castries trip with a car rental

  • Choose one of our car rentals in Castries and explore the city at your own pace. Easily compare options in one place to find the perfect set of wheels once you've locked in your hotel and cheap flights from Washington Dulles International Airport to Castries.

Plan the rest of your trip from Washington D.C. to Castries

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.