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Cheap flights from Washington Dulles to Castries

Compare Washington Dulles to Castries flight deals

Find the cheapest month or even day of the year to fly to Castries

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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 P36,649. Find the lowest prices on one-way and return tickets right here.
Castries.P17,284 per passenger.Departing Thu, 16 Jul.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Washington Dulles on Thu, 16 Jul, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P17,284, select.
Castries.P20,721 per passenger.Departing Sat, 8 Aug.One-way flight with United.Outbound indirect flight with United, departs from Washington Dulles on Sat, 8 Aug, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P20,721, select.
Castries.P21,754 per passenger.Departing Thu, 4 Jun.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Washington Dulles on Thu, 4 Jun, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P21,754, select.
Castries.P23,561 per passenger.Departing Tue, 24 Nov.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Tue, 24 Nov, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P23,561, select.
Castries.P25,641 per passenger.Departing Fri, 10 Apr.One-way flight with United.Outbound indirect flight with United, departs from Washington Dulles on Fri, 10 Apr, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P25,641, select.
Castries.P28,601 per passenger.Departing Thu, 15 Oct.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Thu, 15 Oct, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P28,601, select.
Castries.P37,228 per passenger.Departing Sun, 24 May.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Sun, 24 May, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P37,228, select.
Castries.P95,438 per passenger.Departing Mon, 30 Mar.One-way flight with WestJet.Outbound indirect flight with WestJet, departs from Washington Dulles on Mon, 30 Mar, arriving in St Lucia Hewanorra.Price includes taxes and charges.From P95,438, 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 July.
Mar
from P95,438
Apr
from P25,641
May
from P37,228
Jun
from P21,754
Jul
from P17,284
Aug
from P20,721
Sep
Find prices
Oct
from P28,601
Nov
from P23,561
Dec
Find prices
Jan
Find prices
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
Search flights

St Lucia Hewanorra

31km from central Castries
Cheapest
from P17,284
Search flights

Washington D.C. to Castries: Flight information

The things to know before you go.
Cheapest flight foundP17,284
Cheapest month to flyJuly

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 P36,649. 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 P36,649.
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 April.
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 P36,649.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Castries on Wednesday, 15 April 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 and Washington DC (where Washington Dulles International Airport is located) are both in the UTC-4 timezone. This means you won't have to adjust your watch after you land.

  • Leave enough time to catch your IAD to Castries flight. Generally, it's best to arrive two hours before international departures and an hour ahead for domestic flights.

  • Heading away during a peak period like public or school holidays? Expect longer lines at security and check-in. Play it safe and arrive up to four hours before international flights and two hours ahead of domestic departures.

  • A stopover is the ideal opportunity to break up your journey and perhaps even tick a new city off your list. When browsing for plane tickets from IAD to Castries, uncheck the 'Direct flights only' box to see where you can stop along the way. Here are some options to consider:

    • Hartsfield-Jackson Atlanta International Airport (ATL)

    • Newark Liberty International Airport (EWR)

    • Pearson International Airport (YYZ)

  • The journey from central Washington DC to IAD takes about 1 hour 10 minutes on public transport. If you drive, ride-share or take a cab, you'll cover the 40 kilometres in 50 minutes or so, depending on traffic conditions.

  • Looking for a hotel close to IAD? If you're boarding an early flight from Washington Dulles International Airport to Castries, these accommodation options will get you from your pillow to the plane in no time:

  • 74.39% of flights leaving from Washington Dulles International Airport arrive at their destination on time.

  • You'll find IAD at 1 Saarinen Circle.

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

  • P17,284 is currently the best price for a one-way Washington Dulles International Airport to Castries flight. A return plane ticket starts at P36,649. These fares may change based on availability.

  • To pick up cheap flights from IAD to Castries, book ahead. Airlines usually offer lower prices when tickets are first released.

  • If you're flexible with your travel plans, check out the 'Whole month' tool. It'll show you the lowest price across every month when looking for a Washington Dulles International Airport to Castries ticket.

  • You don't need to check back in every day to see if fares have dropped when you set up a Price Alert. We'll notify you when there's an updated deal for cheap flights from IAD to Castries.

  • Select your ideal arrival and departure times, number of stops and airlines with our filters. Then, sort the results for your flight from Washington Dulles International Airport to Castries by 'Fastest,' 'Best' or 'Cheapest.'

Airports in Castries

George F. L. Charles Airport (SLU)

  • George F. L. Charles Airport (SLU) to the centre of Castries takes around 5 minutes by car. The centre is roughly 3 kilometres away.

  • When travelling on public transport, expect a journey time of around 40 minutes.

  • The last thing you want is a long journey to your hotel if you're arriving on a late flight from Washington Dulles International Airport to Castries. Reserve one of these accommodation options near SLU instead:

  • Pick up a George F. L. Charles Airport rental car and discover Castries and beyond with your own wheels. Drive A Matic, Final Rentals and Sixt are leading providers you can book with here.

  • Reserving your ride from George F. L. Charles Airport around one week ahead of your flight from IAD to Castries can help you get the best possible rate.

Hewanorra Airport (UVF)

  • Hewanorra Airport (UVF) is about 56 kilometres from the centre of Castries. After your flight from Washington Dulles International Airport to Castries, it'll take you around 1 hour 10 minutes to reach the heart of the city in a ride-share or cab.

  • After stepping off your IAD to Castries flight, tuck yourself in at a hotel close to UVF. These are some great options that'll help you switch to relaxation mode:

  • The quickest way to get to where you're going is with a Hewanorra Airport rental car. Grab a set of wheels from Drive A Matic, Sixt or Final Rentals and get going in the blink of an eye.

  • Lock in the best price by reserving your ride from UVF one week ahead of time. You can also expect to have a greater selection of vehicles.

Best time to go to Castries

  • Carefully consider your trip dates before booking your flight from Washington Dulles International Airport to Castries. The city buzzes during high season, but rates are often higher and major attractions can be busy. Go to Castries in the low season if you prefer a more relaxed vibe.

  • Before locking in your Washington Dulles International Airport to Castries plane ticket, think about the type of weather you enjoy. September is the warmest month in Castries, with temperatures ranging from 26ºC (79ºF) to 30ºC (86ºF).

  • Look for cheap tickets from IAD to Castries in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 24ºC (75ºF) and 28ºC (82ºF) on average.

More about Castries

  • When it comes to looking for somewhere to lay your head, you'll find the best places to stay in Castries right here. Check out these hotels after locking in your flight from Washington Dulles International Airport to Castries:

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

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.