$1,043 Cheap Flights from Cardiff (CWL) to Philadelphia (PHL)

View $1,043 flight on Mon, Nov 17, 2025Opens in a new window

Popular airlines from Cardiff International Airport (CWL) to Philadelphia Intl. Airport (PHL)

Cheap Flights from Cardiff to Philadelphia (CWL-PHL)

Prices were available within the past 7 days and start at $1,043 for one-way flights and $913 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$913 Roundtrip, found 6 days ago
$913
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $913 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$919 Roundtrip, found 6 days ago
$919
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $919 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$927 Roundtrip, found 6 days ago
$927
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $927 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$928 Roundtrip, found 6 days ago
$928
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $928 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$934 Roundtrip, found 6 days ago
$934
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $934 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$944 Roundtrip, found 6 days ago
$944
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $944 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$1,026 Roundtrip, found 6 days ago
$1,026
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $1,026 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$1,032 Roundtrip, found 6 days ago
$1,032
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $1,032 found 6 days ago
KLM
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$1,041 Roundtrip, found 6 days ago
$1,041
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $1,041 found 6 days ago
Aer Lingus
Mon, Sep 8 - Mon, Sep 15
CWL
Cardiff
PHL
Philadelphia
$1,121 Roundtrip, found 6 days ago
$1,121
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Mon, Sep 8 from Cardiff to Philadelphia, returning Mon, Sep 15, priced at $1,121 found 6 days ago
Flights from Cardiff (CWL) to Philadelphia (PHL)
Origin airport
Cardiff Intl.
Destination airport
Philadelphia Intl.
Roundtrip price
$913
Distance
3418 mi

Cardiff to Philadelphia Flights

The cheapest times to fly from Cardiff 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 Cardiff to Philadelphia are during the month of September. You can find some of the cheapest flights from Cardiff to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Cardiff to Philadelphia

Sunday is one of the best days to book for cheap flights from Cardiff 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 Cardiff 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 Cardiff to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $1,043 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 Cardiff 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 Cardiff 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 Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL) cost?
Get a cheap one-way flight from $1,043 or cheap return flight from $913 from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL)?
The cheapest month to fly from CWL to PHL is September, when demand is low. Off-peak months are usually when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL)?
To find the cheapest airline flying from CWL to PHL, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL)?
There are no daily direct flights departing from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way in no time at all.
What day of the week has the most flights from CWL to PHL?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL)?
To avoid potential delays on the Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL) route, aim to travel before 3 PM. Flights after this time are 22% more likely to be canceled.**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.
Is it cheaper to buy a plane ticket from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL) last-minute?
Last-minute fares from CWL to PHL are generally more expensive. To secure the lowest rates, start looking for flights as soon as possible. That said, if you're flexible with your travel dates, you may land a cheap fare right before your trip.
Is it cheaper to book a CWL to PHL flight and hotel package?
You'll typically save money by securing a CWL to PHL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. Once you've selected your ideal accommodations and flights, you can add extras like car rentals, tours and activities.
Can I cancel or change the date of my flight from Cardiff Intl. Airport (CWL) to Philadelphia Intl. Airport (PHL)?
It's usually possible to cancel or reschedule your CWL to PHL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.