HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Castries

$348+ Cheap flights from Philadelphia (PHL) to Castries (SLU)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SLU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Castries with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Philadelphia to Castries

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Castries (SLU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$784
(Mytrip)

One-way from

$348
(Mytrip)

Popular in

December

Cheapest in

September

Average price

$626

Good round-trip deal

$752 or less

Good one-way deal

$413 or less
From Philadelphia to Castries George F. L. Charle
Search Deals
One-way flight from Philadelphia to Castries George F. L. Charle
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($271 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease ($99 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Philadelphia to Castries George F. L. Charle.
Search Deals
Price to beat on a one-way flight from Philadelphia to Castries George F. L. Charle.
Search Deals

Find flight deals from Philadelphia to Castries

Cheapest flights from Philadelphia to Castries
Explore the most affordable flight options available from Philadelphia to Castries. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/119:20 amPHL - SLU
2 stops23h 10mMultiple Airlines
Sat 11/156:20 pmSLU - PHL
3 stops30h 16mMultiple Airlines
Deal found 9/9$885
This Mytrip deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:25 pmPHL - SLU
3 stops27h 35mMultiple Airlines
Sat 9/279:10 amSLU - PHL
2 stops24h 44mMultiple Airlines
Deal found 9/8$917
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/124:50 pmPHL - SLU
2 stops24h 40mMultiple Airlines
Sun 10/1912:30 pmSLU - PHL
3 stops27h 10mMultiple Airlines
Deal found 9/9$919
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/119:20 amPHL - SLU
3 stops33h 40mMultiple Airlines
Wed 10/159:10 amSLU - PHL
2 stops30h 39mMultiple Airlines
Deal found 9/9$921
This Mytrip deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:33 amPHL - SLU
2 stops31h 37mMultiple Airlines
Fri 10/1712:35 pmSLU - PHL
2 stops33h 54mMultiple Airlines
Deal found 9/10$982
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/215:33 amPHL - SLU
3 stops27h 57mMultiple Airlines
Fri 10/241:55 pmSLU - PHL
3 stops25h 54mMultiple Airlines
Deal found 9/9$1,009
This Mytrip deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/275:33 amPHL - SLU
2 stops12h 32mMultiple Airlines
Thu 10/3012:35 pmSLU - PHL
2 stops27h 16mMultiple Airlines
Deal found 9/9$1,039

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia to Castries that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Philadelphia to Castries that are best for you.

Fly from

Philadelphia

Fly to

Castries

Route

Depart

Return

Price

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Tue 11/11

9:20 am-9:30 am

2 stops23h 10m

Castries George F. L. Charle

Sat 11/15

6:20 pm-11:36 pm

3 stops30h 16m

$885

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Fri 9/19

3:25 pm-7:00 pm

3 stops27h 35m

Castries George F. L. Charle

Sat 9/27

9:10 am-9:54 am

2 stops24h 44m

$917

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Sun 10/12

4:50 pm-5:30 pm

2 stops24h 40m

Castries George F. L. Charle

Sun 10/19

12:30 pm-3:40 pm

3 stops27h 10m

$919

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Sat 10/11

9:20 am-7:00 pm

3 stops33h 40m

Castries George F. L. Charle

Wed 10/15

9:10 am-3:49 pm

2 stops30h 39m

$921

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Fri 10/10

5:33 am-1:10 pm

2 stops31h 37m

Castries George F. L. Charle

Fri 10/17

12:35 pm-10:29 pm

2 stops33h 54m

$982

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Tue 10/21

5:33 am-9:30 am

3 stops27h 57m

Castries George F. L. Charle

Fri 10/24

1:55 pm-3:49 pm

3 stops25h 54m

$1,009

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Tue 10/21

4:50 pm-7:00 pm

2 stops26h 10m

Castries George F. L. Charle

Sun 10/26

12:30 pm-2:47 pm

3 stops26h 17m

$1,024

PhiladelphiaCastries

PHL - SLU

PHLSLU

Philadelphia

Tue 11/11

9:20 am-9:30 am

2 stops23h 10m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Best time to book a flight from Philadelphia to Castries

Have a flexible travel schedule? Discover the best time to fly to Castries from Philadelphia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Castries

What is the cheapest month to book a flight from Philadelphia to Castries?

Currently, August is the cheapest month in which you can book a flight from Philadelphia to Castries (average of $525). Flying from Philadelphia to Castries in July is currently the most expensive (average of $767). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Castries

Get insights into the airlines that provide service to Castries. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Castries. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with American Airlines from Philadelphia to Castries by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Overall

7.2

Entertainment

6.9

Food

6.4

Crew

8.0

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Boarding

7.5

Overall

7.2

Entertainment

6.9

Food

6.4

Crew

8.0

Comfort

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Castries. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Philadelphia to Castries round-trip?

    According to our current data, American Airlines ($547), offers the cheapest pricing from Philadelphia to Castries. American Airlines is 37% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Philadelphia to Castries that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Castries flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Castries?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Castries.

  • Can I find deals for business class flights from Philadelphia to Castries?

    Yes. Cheapflights offers flight deals from Philadelphia to Castries by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to Castries?

    Currently, August is the cheapest month in which you can book a flight from Philadelphia to Castries (average of $525). Flying from Philadelphia to Castries in July is currently the most expensive (average of $767). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Castries?

Book flights to Castries if you plan to visit one of these locations
Rodney Bay
Gros Islet
Marigot Bay

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Philadelphia to Castries

Discover the top airline that operate flights from Philadelphia to Castries. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$547Average$818FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.