PHL - SLU

$642 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 4/1. 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
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Everything you should know

Cheapest round-trip
$780
Overall average: $811
Multiple Airlines
Mon 1/5Sat 1/10
PHL - SLU • 2 stops
Cheapest one-way
$642
Multiple Airlines
Wed 4/1
PHL - SLU • 3 stops
When to travel
September
Cheapest • 20% price drop
February
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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!
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

Mon, Jan 5 - Sat, Jan 10
Multiple Airlines Logo
6:10 am - 6:05 pmPHL-SLU
10h 55m2 stops
Multiple Airlines Logo
6:20 pm - 12:32 amSLU-PHL
31h 12m2 stops
$780Multiple Airlines
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Mon, Nov 10 - Thu, Nov 13
Multiple Airlines Logo
9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
Multiple Airlines Logo
3:20 pm - 8:27 pmSLU-PHL
30h 07m3 stops
$815Multiple Airlines
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Mon, Nov 10 - Thu, Nov 13
Multiple Airlines Logo
9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
Multiple Airlines Logo
6:20 pm - 11:26 pmSLU-PHL
30h 06m2 stops
$817Multiple Airlines
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Mon, Nov 10 - Thu, Nov 13
Multiple Airlines Logo
6:00 am - 3:15 pmPHL-SLU
32h 15m3 stops
Multiple Airlines Logo
3:20 pm - 8:27 pmSLU-PHL
30h 07m3 stops
$880Multiple Airlines
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Thu, Dec 11 - Sun, Dec 14
Multiple Airlines Logo
5:15 am - 11:30 amPHL-SLU
29h 15m2 stops
Multiple Airlines Logo
7:10 pm - 11:34 pmSLU-PHL
29h 24m3 stops
$921Multiple Airlines
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Thu, Jan 15 - Mon, Jan 19
Multiple Airlines Logo
5:15 am - 3:15 pmPHL-SLU
33h 00m2 stops
Multiple Airlines Logo
12:35 pm - 2:47 pmSLU-PHL
27h 12m2 stops
$935Multiple Airlines
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Thu, Dec 11 - Sun, Dec 14
Multiple Airlines Logo
6:00 am - 11:30 amPHL-SLU
28h 30m3 stops
Multiple Airlines Logo
7:10 pm - 11:34 pmSLU-PHL
29h 24m3 stops
$955Multiple Airlines
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Sat, Nov 29 - Sat, Dec 6
Multiple Airlines Logo
5:25 am - 10:10 pmPHL-SLU
15h 45m3 stops
Multiple Airlines Logo
6:20 pm - 5:17 pmSLU-PHL
23h 57m2 stops
$980Multiple Airlines
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Thu, Nov 27 - Sun, Nov 30
Multiple Airlines Logo
3:30 pm - 7:00 pmPHL-SLU
26h 30m3 stops
Multiple Airlines Logo
7:10 pm - 11:03 pmSLU-PHL
28h 53m2 stops
$990Multiple Airlines
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Sat, Nov 22 - Thu, Nov 27
Multiple Airlines Logo
5:25 am - 10:10 pmPHL-SLU
15h 45m3 stops
Multiple Airlines Logo
3:20 pm - 11:46 pmSLU-PHL
33h 26m3 stops
$1,011Multiple Airlines
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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 June and December, where the average cost of round-trip tickets is $965 and $945 respectively.

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Good to know

Low seasonDecember
Cheapest flight$642
Best time to beat the crowds but there is an average 20% increase in price.
Most popular time to fly and prices are also 11% 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 $642 for a one-way ticket and $780 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.
7.2
American AirlinesOverall score based on 11030 reviews
7.5Boarding
6.4Food
8.0Crew
6.9Entertainment
7.2Comfort
Airline reviews

Delays to take off and to leave the plane after landing added a lot of time to this flight.

6.0 GoodMiguel, Oct 2025PHL - MIA
Read more American Airlines reviews

Delays to take off and to leave the plane after landing added a lot of time to this flight.

The Phildalphia to Allentown portion was a BUS, not a plane. All was as expected.

Excellent - explanations were clear staff was nice and flight was comfortable

Airport in MXP is crazy. Get there at least 2 hours before flight.

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.

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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