PHL - SLU

$788 Find Cheap Flights from Philadelphia to Castries

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Castries departing on 9/4. 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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Flights 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

Thu, Sep 4 - Sun, Sep 7
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4:03 pm - 11:30 amPHL-SLU
19h 27m2 stops
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12:30 pm - 8:55 pmSLU-PHL
32h 25m2 stops
$788
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Thu, Sep 4 - Sun, Sep 7
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4:03 pm - 11:30 amPHL-SLU
19h 27m2 stops
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12:30 pm - 3:08 pmSLU-PHL
26h 38m3 stops
$832
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Thu, Sep 4 - Sun, Sep 7
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4:03 pm - 1:10 pmPHL-SLU
21h 07m3 stops
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12:30 pm - 3:08 pmSLU-PHL
26h 38m3 stops
$894
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Sat, Nov 29 - Sat, Dec 6
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9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
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9:10 am - 2:47 pmSLU-PHL
30h 37m2 stops
$1,017
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Sat, Nov 8 - Sun, Nov 16
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9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
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9:10 am - 2:47 pmSLU-PHL
30h 37m3 stops
$1,023
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Sat, Nov 29 - Sat, Dec 6
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9:20 am - 7:00 pmPHL-SLU
32h 40m2 stops
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9:10 am - 2:47 pmSLU-PHL
30h 37m3 stops
$1,024
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Thu, Aug 14 - Sun, Aug 17
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5:05 am - 11:30 amPHL-SLU
30h 25m2 stops
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12:30 pm - 8:54 pmSLU-PHL
32h 24m2 stops
$1,088
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Sat, Aug 9 - Sat, Aug 16
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6:00 am - 11:45 amPHL-SLU
29h 45m3 stops
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11:00 am - 11:20 pmSLU-PHL
12h 20m3 stops
$1,147
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Thu, Aug 21 - Sun, Aug 24
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3:51 pm - 11:30 amPHL-SLU
19h 39m2 stops
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5:00 am - 9:46 amSLU-PHL
28h 46m2 stops
$1,161
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Sat, Nov 8 - Sun, Nov 16
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4:35 pm - 11:25 amPHL-SLU
17h 50m3 stops
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12:35 pm - 2:47 pmSLU-PHL
27h 12m3 stops
$1,206
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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 $587 (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 $937 respectively.

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Good to know

Low seasonOctober
High seasonMarch
Cheapest flight$788
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 13% 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 $788 for a round-trip ticket.

  • 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
6.9Entertainment
7.2Comfort
8.0Crew
6.5Food
7.5Boarding
Airline reviews

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

8.0 ExcellentFernando, Jul 2025PHL - CLT
Read more American Airlines reviews

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.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

It’s a great flight. Service is good. Staff is awesome.

Again flight was awesome except British Airways lost both gate checked luggage’s. Still missing

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

Everyone was nice. It was on time and the food was. Airplane food, but not horrible

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

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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