PHL - SLU

$550 Find Cheap Flights from Philadelphia to Castries

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Castries departing on 7/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Castries

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Castries, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Castries, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$820
Multiple Airlines
Fri 5/1Sat 5/9
PHL - SLU • 3 stops
Cheapest one-way
$550
Multiple Airlines
Sat 7/18
PHL - SLU • 3 stops
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Castries!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Philadelphia to Castries (PHL-SLU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Castries that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Castries

Fri, May 1 - Sat, May 9
Multiple Airlines Logo
7:00 am - 1:10 pm
PHL
-
SLU
30h 10m
3 stops
Multiple Airlines Logo
5:50 pm - 11:37 pm
SLU
-
PHL
29h 47m
2 stops
$820Multiple Airlines
Wed, May 6 - Sun, May 10
Multiple Airlines Logo
5:45 am - 1:10 pm
PHL
-
SLU
31h 25m
3 stops
Multiple Airlines Logo
5:00 am - 11:37 pm
SLU
-
PHL
18h 37m
2 stops
$822Multiple Airlines
Fri, May 1 - Sat, May 9
Multiple Airlines Logo
5:45 am - 1:10 pm
PHL
-
SLU
31h 25m
2 stops
Multiple Airlines Logo
5:50 pm - 11:37 pm
SLU
-
PHL
29h 47m
2 stops
$833Multiple Airlines
Wed, May 6 - Sun, May 10
Multiple Airlines Logo
10:25 am - 7:00 pm
PHL
-
SLU
32h 35m
2 stops
Multiple Airlines Logo
5:00 am - 11:37 pm
SLU
-
PHL
18h 37m
2 stops
$854Multiple Airlines
Tue, May 26 - Fri, May 29
Multiple Airlines Logo
6:00 am - 6:25 pm
PHL
-
SLU
12h 25m
2 stops
Multiple Airlines Logo
6:00 pm - 3:38 pm
SLU
-
PHL
21h 38m
2 stops
$961Multiple Airlines
Tue, May 26 - Fri, May 29
Multiple Airlines Logo
6:00 am - 6:25 pm
PHL
-
SLU
12h 25m
2 stops
Multiple Airlines Logo
6:00 pm - 2:48 pm
SLU
-
PHL
20h 48m
3 stops
$964Multiple Airlines
Tue, May 26 - Fri, May 29
Multiple Airlines Logo
6:00 am - 9:30 am
PHL
-
SLU
27h 30m
3 stops
Multiple Airlines Logo
6:00 pm - 2:48 pm
SLU
-
PHL
20h 48m
3 stops
$1,011Multiple Airlines
Fri, May 1 - Sat, May 9
Multiple Airlines Logo
7:00 am - 1:10 pm
PHL
-
SLU
30h 10m
3 stops
Multiple Airlines Logo
3:45 pm - 11:37 pm
SLU
-
PHL
31h 52m
3 stops
$1,027Multiple Airlines
Sun, Apr 12 - Sun, Apr 19
Multiple Airlines Logo
8:53 pm - 3:35 pm
PHL
-
SLU
42h 42m
3 stops
Multiple Airlines Logo
6:00 pm - 9:57 pm
SLU
-
PHL
27h 57m
3 stops
$1,057Multiple Airlines
Wed, Apr 15 - Sun, Apr 19
Multiple Airlines Logo
4:25 pm - 1:10 pm
PHL
-
SLU
20h 45m
2 stops
Multiple Airlines Logo
6:00 pm - 10:43 pm
SLU
-
PHL
28h 43m
2 stops
$1,061Multiple Airlines
Booking Insights

KAYAK's insights & trends for Philadelphia to Castries flights

Get data-powered insights and trends into flights from Philadelphia to Castries to help you find the cheapest flights, the best time to fly and much more.

Which airlines fly non-stop between Philadelphia and Castries?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Philadelphia to Castries.

There is just one airline that flies from Philadelphia to Castries direct and that is American Airlines. The best round-trip deal found from American Airlines for the route is $587.

Find deals

Good to know

Cheapest flight$550
Flight from Philadelphia to Castries

When to book flights from Philadelphia to Castries

Are your dates flexible? Find out the best times to travel from Philadelphia to Castries based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Castries

  • What is the cheapest flight from Philadelphia to Castries?

    In the last 3 days, the lowest price for a flight from Philadelphia to Castries was $550 for a one-way ticket and $820 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Castries?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Philadelphia and on arrival in Castries.

  • Which aircraft models fly most regularly from Philadelphia to Castries?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Castries?

    oneworld is the only airline alliance operating flights between Philadelphia and Castries.

  • How does KAYAK find such low prices on flights from Philadelphia to Castries?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Castries.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Castries?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Castries from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Castries?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Castries with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and SLU can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Castries?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Castries from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Philadelphia to Castries

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Castries. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Castries? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11488 reviews
6.4Food
7.2Comfort
6.9Entertainment
7.5Boarding
7.9Crew
Airline reviews

It would have been nice if American tried to care.

2.0 MediocreJeffrey, Mar 2026
PHL - RDU
Read more American Airlines reviews

It would have been nice if American tried to care.

Delayed initially because they couldn’t print the flight details. Poor instruction on delay. When I got on the plane the flight attendant argued with me about whether my carry on would fit (it did, although she didn’t acknowledge that). No greeting (other than arguing with me) getting on or off the plane.

Beverage service was not good. Also just one service in 5 hr 30 min flight. No ask fir water ir anything beside one time beverage service.

They are always late and seats was also not having working charger

Broke my luggage and I can't get a resolution yet.

My flight to London from Philadelphia was cancelled due to weather.

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Long delays, lack of information about the status of the flight. The flight was delayed 4 times.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

Flight was late and boarding was confusing because gate changed and I didn’t get a notification

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

Information on your arrival and departure airports

Philadelphia (PHL)
Castries (SLU)