$120 Cheap Flights from St. Thomas (STT) to Philadelphia (PHL)

View $120 flight on Mon, Sep 29, 2025Opens in a new window

Popular airlines from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)

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Cheap Flights from St. Thomas to Philadelphia (STT-PHL)

Prices were available within the past 7 days and start at $120 for one-way flights and $255 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Fri, Nov 14 - Tue, Nov 18
STT
St. Thomas
PHL
Philadelphia
$255 Roundtrip, found 6 days ago
$255
Roundtrip
found 6 days ago
Select Spirit Airlines flight, departing Fri, Nov 14 from St. Thomas to Philadelphia, returning Tue, Nov 18, priced at $255 found 6 days ago
Spirit Airlines
Mon, Sep 22 - Sat, Oct 4
STT
St. Thomas
PHL
Philadelphia
$256 Roundtrip, found 3 days ago
$256
Roundtrip
found 3 days ago
Select Spirit Airlines flight, departing Mon, Sep 22 from St. Thomas to Philadelphia, returning Sat, Oct 4, priced at $256 found 3 days ago
Spirit Airlines
Thu, Oct 30 - Wed, Nov 5
STT
St. Thomas
PHL
Philadelphia
$257 Roundtrip, found 3 days ago
$257
Roundtrip
found 3 days ago
Select Spirit Airlines flight, departing Thu, Oct 30 from St. Thomas to Philadelphia, returning Wed, Nov 5, priced at $257 found 3 days ago
Spirit Airlines
Fri, Nov 14 - Tue, Nov 18
STT
St. Thomas
PHL
Philadelphia
$265 Roundtrip, found 6 days ago
$265
Roundtrip
found 6 days ago
Select Spirit Airlines flight, departing Fri, Nov 14 from St. Thomas to Philadelphia, returning Tue, Nov 18, priced at $265 found 6 days ago
Spirit Airlines
Sat, Oct 11 - Sat, Oct 18
STT
St. Thomas
PHL
Philadelphia
$268 Roundtrip, found 6 hours ago
$268
Roundtrip
found 6 hours ago
Select Spirit Airlines flight, departing Sat, Oct 11 from St. Thomas to Philadelphia, returning Sat, Oct 18, priced at $268 found 6 hours ago
Spirit Airlines
Fri, Nov 14 - Tue, Nov 18
STT
St. Thomas
PHL
Philadelphia
$273 Roundtrip, found 6 days ago
$273
Roundtrip
found 6 days ago
Select Spirit Airlines flight, departing Fri, Nov 14 from St. Thomas to Philadelphia, returning Tue, Nov 18, priced at $273 found 6 days ago
JetBlue Airways
Tue, Oct 28 - Sat, Nov 15
STT
St. Thomas
PHL
Philadelphia
$345 Roundtrip, found 6 days ago
$345
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Tue, Oct 28 from St. Thomas to Philadelphia, returning Sat, Nov 15, priced at $345 found 6 days ago
American Airlines
Wed, Jan 28 - Sun, Feb 1
STT
St. Thomas
PHL
Philadelphia
$570 Roundtrip, found 1 day ago
$570
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jan 28 from St. Thomas to Philadelphia, returning Sun, Feb 1, priced at $570 found 1 day ago
Delta
Fri, Jan 9 - Wed, Jan 14
STT
St. Thomas
PHL
Philadelphia
$579 Roundtrip, found 1 day ago
$579
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Jan 9 from St. Thomas to Philadelphia, returning Wed, Jan 14, priced at $579 found 1 day ago
United
Sun, Dec 21 - Mon, Dec 29
STT
St. Thomas
PHL
Philadelphia
$579 Roundtrip, found 14 hours ago
$579
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Dec 21 from St. Thomas to Philadelphia, returning Mon, Dec 29, priced at $579 found 14 hours ago

Find the cheapest month to fly from St. Thomas (STT) to Philadelphia (PHL)

October is typically the cheapest month to fly

From $145 - $683 per traveler.

Graph displaying average flight prices per month

Alternative airports near Philadelphia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to New Castle ILG. Average driving time to city center is 44 minutes. Flights from $649
ILG
New Castle
Average driving time to city center44 min
Flights from $649
Flights from St. Thomas (STT) to Philadelphia (PHL)
Origin airport
Cyril E. King
Destination airport
Philadelphia Intl.
Airlines serving
American Airlines, Delta, JetBlue Airways, Spirit Airlines, United
Roundtrip price
$254
Distance
1609 mi

St. Thomas to Philadelphia Flights

The cheapest times to fly from St. Thomas to Philadelphia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Thomas to Philadelphia are during the month of November. You can find some of the cheapest flights from St. Thomas to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Thomas to Philadelphia

Sunday is one of the best days to book for cheap flights from St. Thomas to Philadelphia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Thomas to Philadelphia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Thomas to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $120 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Thomas to Philadelphia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Thomas to Philadelphia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL) cost?
Snag a cheap one-way flight from $120 or cheap return flight from $255 from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
The cheapest month to fly from STT to PHL is November, when demand is low. Off-peak months are often when you'll find lower airfares between these airports.
Which airlines fly direct from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
Hop on a direct flight with American Airlines and travel straight from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL).
What is the cheapest airline that flies from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
To find the cheapest airline flying from STT to PHL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
On average, there is just 1 nonstop flight taking off from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL) every day. If this doesn't fit your plans, check out flights with layovers. Just customize your search results on Expedia to include one or more stops to find the next best option.
What are the most popular departure times for flights from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
More travelers fly between STT and PHL at 2 PM than at any other point in the day. Rather go when it's quieter? Pick a flight outside the busiest times and it's possible you'll save on your ticket as well.
What day of the week has the most flights from STT to PHL?
If you travel on a Friday, you'll get the biggest range of options for flights from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL).
What is the earliest flight from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
Catch the earliest flight at around 2:09PM UTC-4, departing from Cyril E. King Airport (STT). You'll be in the air for around 4h 30m, touching down at Philadelphia Intl. Airport (PHL) at approximately 5:39PM UTC-5.
How long does it take to fly from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
The average flight time from STT to PHL is 4 hours and 30 minutes, covering a distance of 1,600 mi.
What is the best time to fly from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
Opt for a flight from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Philadelphia from Cyril E. King Airport (STT)?
Browse your flight options from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL). This is the only airport in Philadelphia you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL) last-minute?
Booking your flight from STT to PHL just before your getaway is generally more expensive. But if you're flexible with your departure times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a STT to PHL flight and hotel package?
Opting for a STT to PHL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Pick from our extensive range of hotels and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cyril E. King Airport (STT) to Philadelphia Intl. Airport (PHL)?
If you reserved your STT to PHL flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

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*Available to One Key members.