C$244 Cheap Flights from Philadelphia International (PHL) to Castries (SLUA)

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Flight deals from Philadelphia International to Castries

Looking for a cheap last-minute deal or the best return flight from Philadelphia International Airport to Castries? If you want to travel next month, return fares start from C$739. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Philadelphia International to Castries from C$244 one-way

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia International to Castries flights are currently cheapest in June.

Which airlines fly from Philadelphia International to Castries?

Alternative Philadelphia International to Castries routes

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

Philadelphia to Castries: Flight information

The things to know before you go.
Cheapest flight foundC$244
Cheapest month to flyJune
Average flight time4 hrs, 48 mins
Most popular airlineAmerican Airlines
Average flights per week2

Finding cheap flights from Philadelphia International 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 Philadelphia International to Castries is C$670. 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.
4 hours and 48 minutes is the average flight time from Philadelphia International to Castries.
American Airlines flies direct from Philadelphia International to Castries.
As of May 2026, there are 2 flights per week flying from Philadelphia International to Castries.
The cheapest month to fly from Philadelphia International to Castries is usually May.
If you're flying from Philadelphia International 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$670.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to Castries on Friday, May 29, 2026.
Yes – the average flight time is 4 hours and 48 minutes.
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 May, the average temperature is usually around 27°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 Philadelphia International Airport (PHL) to Castries: what you need to know

  • Castries and Philadelphia (where Philadelphia International Airport is located) share the UTC-4 timezone. That means you won't need to change your watch when you land.

  • To ensure you catch your flight from PHL to Castries, leave plenty of time to navigate the airport and find your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • If you're going away during a popular month like August, head to the airport even earlier. You'll want to arrive up to four hours before international flights and two hours ahead of a domestic departure. Check-in and security lines are longer during vacation periods like summer and spring break.

  • You can catch a direct flight from Philadelphia International Airport to Castries that touches down at Hewanorra Airport (UVF).

  • American Airlines is a popular airline that operates direct flights from Philadelphia International Airport to Castries.

  • We make it easy to book a flight from PHL to Castries with a stopover. To see your options, deselect 'Direct flights only.' Then, simply select a flight offering a stop long enough to tour the city of your choice. Some popular stopovers include:

    • Grantley Adams International Airport (BGI)

    • Newark Liberty International Airport (EWR)

    • Hartsfield-Jackson Atlanta International Airport (ATL)

  • If you have a passport from United States and are travelling to Saint Lucia for tourism purposes, you won't need a visa. However, visa and entry requirements may vary based on your reason for visiting and are subject to change. For the latest rules, contact your destination's nearest consulate or embassy before reserving a cheap ticket from Philadelphia International Airport to Castries.

  • PHL is about 19 kilometres from central Philadelphia. If you're ride-sharing, driving or catching a cab from the centre, it'll take 17 minutes or so to get there, depending on traffic conditions. If you're taking public transport, expect the journey time to be approximately 44 minutes.

  • Want a stress-free start to your travels? Stay near PHL. Whether you're taking an early flight from Philadelphia International Airport to Castries or want to avoid feeling rushed, these hotels have you covered:

How to find the cheapest flights from Philadelphia International Airport (PHL) to Castries

  • The best price we've seen for a one-way ticket from Philadelphia International Airport to Castries is C$244. The cheapest price for a return flight is C$670. Bear in mind fares can change due to demand at the time of booking.

  • To score cheap tickets from PHL to Castries, reserve your trip 10 months ahead of the departure date.

  • Schedule your trip for June. That's the cheapest month for tickets from Philadelphia International Airport to Castries. If your travel dates are flexible, use the 'Whole month' tool to find the lowest price across each month.

  • Create a Price Alert for cheap tickets from PHL to Castries. You don't need to check every day to find out if prices have dropped. We'll let you know the moment there's a change in price.

  • Use the filters to tailor your flights from Philadelphia International Airport to Castries. Simply enter your preferred departure and arrival times, number of stops and airlines. Alternatively, sort your results by 'Cheapest' to get the best deals.

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 about 1 hour and 9 minutes.

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

George F. L. Charles Airport (SLU)

  • After your flight from Philadelphia International Airport to Castries has landed, you can make your way to the city centre in about 6 minutes by car. Central Castries is approximately 3 kilometres from George F. L. Charles Airport (SLU).

  • If you're catching public transport, it'll take about 40 minutes.

  • After your flight from PHL to Castries, tuck yourself in at a hotel near SLU. These are some comfortable options that'll help you get into relaxation mode:

Best time to go to Castries

  • July is the most popular month to board a flight from Philadelphia International Airport to Castries while May is the quietest. To work out the ideal time to go to Castries, consider your preferred travel pace and style.

  • Book your flight from Philadelphia International Airport to Castries for September to experience the city during its warmest month. You can expect temperatures to range from 26ºC to 30ºC.

  • Search for cheap flights from PHL to Castries in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 24ºC and 28ºC on average.

More about Castries

  • Start your Castries trip off on the right foot by choosing the perfect place to stay. As soon as you've booked your flight from Philadelphia International Airport to Castries, explore our selection of hotels including:

  • Derek Walcott Square and Morne Fortune are a couple of top attractions to put on your Castries travel itinerary. Keep the adventure rolling by checking out Immaculate Conception Church.

Complete your Castries trip with a car rental

  • Finding you a cheap flight from Philadelphia International Airport to Castries isn't the only trick up our sleeve. Check out our car rentals in Castries and see the sights your way. We search for deals from trusted car rental companies and put them all in one place. Instantly compare rates and then book with no fees.

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