PHL - SLU

$336 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 10/25. 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

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
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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

Sun, Sep 28 - Sun, Oct 5
Multiple Airlines Logo
10:35 am - 5:30 pmPHL-SLU
30h 55m2 stops
Multiple Airlines Logo
5:00 am - 11:59 pmSLU-PHL
18h 59m2 stops
$743Multiple Airlines
Find Deal
Sun, Sep 28 - Sun, Oct 5
Multiple Airlines Logo
9:20 am - 5:30 pmPHL-SLU
32h 10m3 stops
Multiple Airlines Logo
5:00 am - 11:59 pmSLU-PHL
18h 59m2 stops
$756Multiple Airlines
Find Deal
Sun, Sep 28 - Sun, Oct 5
Multiple Airlines Logo
9:20 am - 5:30 pmPHL-SLU
32h 10m3 stops
Multiple Airlines Logo
12:30 pm - 3:40 pmSLU-PHL
27h 10m3 stops
$780Multiple Airlines
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Tue, Sep 30 - Tue, Oct 7
Multiple Airlines Logo
2:07 pm - 7:00 pmPHL-SLU
28h 53m3 stops
Multiple Airlines Logo
7:30 am - 11:29 pmSLU-PHL
39h 59m3 stops
$966Multiple Airlines
Find Deal
Fri, Nov 7 - Mon, Nov 10
Multiple Airlines Logo
9:20 am - 10:10 pmPHL-SLU
35h 50m3 stops
Multiple Airlines Logo
9:10 am - 2:47 pmSLU-PHL
30h 37m3 stops
$987Multiple Airlines
Find Deal
Wed, Nov 5 - Mon, Nov 10
Multiple Airlines Logo
9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
Multiple Airlines Logo
9:10 am - 2:47 pmSLU-PHL
30h 37m3 stops
$1,002Multiple Airlines
Find Deal
Wed, Nov 5 - Mon, Nov 10
Multiple Airlines Logo
10:34 am - 1:10 pmPHL-SLU
25h 36m3 stops
Multiple Airlines Logo
12:35 pm - 2:47 pmSLU-PHL
27h 12m3 stops
$1,173Multiple Airlines
Find Deal
Tue, Sep 30 - Tue, Oct 7
Multiple Airlines Logo
10:35 am - 7:00 pmPHL-SLU
32h 25m2 stops
Multiple Airlines Logo
7:30 am - 11:29 pmSLU-PHL
39h 59m3 stops
$1,181Multiple Airlines
Find Deal
Tue, Nov 4 - Sat, Nov 8
Multiple Airlines Logo
9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
Multiple Airlines Logo
9:10 am - 2:47 pmSLU-PHL
30h 37m3 stops
$1,221Multiple Airlines
Find Deal
Tue, Nov 4 - Sat, Nov 8
Multiple Airlines Logo
9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
Multiple Airlines Logo
6:20 pm - 3:51 pmSLU-PHL
22h 31m2 stops
$1,327Multiple Airlines
Find Deal

Everything you should know

When to travel
September
Cheapest • 28% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$743
Overall average: $626
Multiple Airlines
Sun 9/28Sun 10/5
PHL - SLU • 2 stops
Cheapest one-way
$336
Multiple Airlines
Sat 10/25
PHL - SLU • 3 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Castries!
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.

What is the cheapest month to fly from Philadelphia to Castries?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Castries, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Castries is September, where tickets cost $626 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,960 and $965 respectively.

Find deals

Good to know

Low seasonSeptember
Cheapest flight$336
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly and prices are also 14% lower on average.
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 $336 for a one-way ticket and $743 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.

  • 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.
7.2
American AirlinesOverall score based on 10000 reviews
7.5Boarding
7.2Comfort
8.0Crew
6.4Food
6.9Entertainment
Airline reviews

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

4.0 OkayDavid, Aug 2025PHL - MCO
Read more American Airlines reviews

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

Did not get the seat I selected and paid for.

The flight was canceled 3 hours after original take off time

Plane was delayed for 6 hours, at first by weather, which is understandable, but was further delayed with NO given reason for 2 1/2 hours more. We had no clue when we were going to depart actually until they opened the ramp. VERY POOR to ZERO COMMUNICATION!!!

Flight was delayed and after being in the airport for like seven hours, it was canceled.

Flight delays numerous times. Everytime we would get close to boarding it would be delayed again. Strung along the entire time.

Overall very good, only complaint I have is the crew from CLT to SAT could have collected trash sooner.

Above and beyond effort from this crew in a tough situation. So helpful and understanding. Thank you!

We started with trouble checking in 24 hours early. Then my husband did not get his TSA precheck. Finally flight delayed due to no crew. I know things happen

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

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

Information on your arrival and departure airports

Philadelphia (PHL)
Castries (SLU)

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