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Cheap flights from Cardiff to Philadelphia from £591

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — PHL
21 Aug — 28 Aug1
1 adult

Cheap flight deals from Cardiff to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 16 August 2025.

Round-trip from

£591
KLM
  • KLM
  • 30/9-7/10
  • 4 total stops
  • 31h 17m total
  • Cardiff to Philadelphia
Search Deals

Find flight deals from Cardiff to Philadelphia

Cheapest flights from Cardiff to Philadelphia
Explore the most affordable flight options available from Cardiff to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 August 2025.

Tue 30/909:50CWL - PHL
2 stops16h 44mKLM
Tue 7/1013:42PHL - CWL
2 stops14h 33mKLM
Deal found 15/8£591
Sun 28/911:00CWL - PHL
2 stops34h 25mMultiple Airlines
Sun 5/1020:30PHL - CWL
1 stop11h 15mMultiple Airlines
Deal found 14/8£616
Sun 28/909:50CWL - PHL
2 stops16h 44mDelta
Sun 5/1007:10PHL - CWL
2 stops21h 05mDelta
Deal found 14/8£651
Tue 30/916:20CWL - PHL
1 stop31h 40mMultiple Airlines
Tue 7/1020:30PHL - CWL
1 stop29h 55mMultiple Airlines
Deal found 15/8£857

Cheapflights Fare Finder

 
Customise your flight search to find flights from Cardiff to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 August 2025.
Use the filters below to find and compare flights from Cardiff to Philadelphia that are best for you.

Fly from

Cardiff

Fly to

Philadelphia

Route

Depart

Return

Price

CardiffPhiladelphia

CWL - PHL

CWLPHL

Cardiff Wales

Tue 30/9

09:50-21:34

2 stops16h 44m

Philadelphia

Tue 7/10

13:42-09:15

2 stops14h 33m

£591

CardiffPhiladelphia

CWL - PHL

CWLPHL

Cardiff Wales

Sun 28/9

11:00-16:25

2 stops34h 25m

Philadelphia

Sun 5/10

20:30-12:45

1 stop11h 15m

£616

CardiffPhiladelphia

CWL - PHL

CWLPHL

Cardiff Wales

Sun 28/9

09:50-21:34

2 stops16h 44m

Philadelphia

Sun 5/10

07:10-09:15

2 stops21h 05m

£651

CardiffPhiladelphia

CWL - PHL

CWLPHL

Cardiff Wales

Tue 30/9

16:20-19:00

1 stop31h 40m

Philadelphia

Tue 7/10

20:30-07:25

1 stop29h 55m

£857

Flights are sorted by cheapest return flights first.

Deals found on 15/8

Best time to book a flight from Cardiff to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Cardiff with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Cardiff to Philadelphia

What is the cheapest month to book a flight from Cardiff to Philadelphia?

Currently, March is the cheapest month in which you can book a flight from Cardiff to Philadelphia (average of £648). Flying from Cardiff to Philadelphia in July is currently the most expensive (average of £839). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated 16 August 2025.
Read reviews from past customers who have flown with KLM from Cardiff to Philadelphia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,384 reviews
Check prices

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,384 reviews
KLM
7.8
Good
1,384 reviews
Check prices

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from Cardiff to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Cardiff to Philadelphia round-trip?

    Cheapflights users have booked flights from Cardiff to Philadelphia round-trip from £527.

  • Can I find deals for flights from Cardiff to Philadelphia that include hotel bookings?

    Yes. In addition to deals on Cardiff to Philadelphia flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Philadelphia.

  • Can I find deals for business class flights from Cardiff to Philadelphia?

    Yes. Cheapflights offers flight deals from Cardiff to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Cardiff to Philadelphia?

    Currently, March is the cheapest month in which you can book a flight from Cardiff to Philadelphia (average of £648). Flying from Cardiff to Philadelphia in July is currently the most expensive (average of £839). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Cardiff to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Cardiff to Philadelphia

Discover the top airline that operate flights from Cardiff to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 August 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£527Average£578FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Cardiff to Philadelphia?

Deals for Cardiff to Philadelphia flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Cardiff to Philadelphia?

Cheapflights simply makes it quick and affordable to book flights from Cardiff to Philadelphia by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Cardiff to Philadelphia with no change fees?

Need flexible booking options for your flight to Philadelphia from Cardiff? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Cardiff to Philadelphia become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Philadelphia from Cardiff today and book when prices fit your budget.

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