Find flights
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Cardiff from £99

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CWL
3 Sep — 10 Sep1
1 adult

Cheap flight deals from Heathrow to Cardiff

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Cardiff (CWL). 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 29 August 2025.

Round-trip from

£170

One-way from

£99

Popular in

July

Cheapest in

December

Average price

£337
11/10-18/10
  • 11/10-18/10
  • 2 total stops
  • 24h 45m total
  • London to Cardiff
Search Deals
27/9
  • 27/9
  • 1 total stop
  • 13h 25m total
  • London to Cardiff
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£35 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Heathrow to Cardiff

Cheapest flights from Heathrow to Cardiff
Explore the most affordable flight options available from Heathrow to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 August 2025.

Sat 11/1021:10LHR - CWL
1 stop13h 25mMultiple Airlines
Sat 18/1009:00CWL - LHR
1 stop11h 20mMultiple Airlines
Deal found 28/8£170
Sat 25/1021:10LHR - CWL
1 stop13h 40mMultiple Airlines
Wed 29/1015:55CWL - LHR
1 stop5h 10mMultiple Airlines
Deal found 27/8£180
Mon 13/1020:50LHR - CWL
2 stops19h 05mMultiple Airlines
Thu 16/1007:55CWL - LHR
1 stop5h 30mMultiple Airlines
Deal found 27/8£186
Fri 3/1021:10LHR - CWL
1 stop10h 20mMultiple Airlines
Tue 7/1020:20CWL - LHR
2 stops18h 25mMultiple Airlines
Deal found 28/8£209
Fri 26/920:10LHR - CWL
1 stop11h 20mMultiple Airlines
Fri 3/1012:25CWL - LHR
1 stop7h 55mMultiple Airlines
Deal found 27/8£219
Thu 25/915:50LHR - CWL
1 stop20h 10mMultiple Airlines
Thu 9/1007:55CWL - LHR
1 stop4h 45mMultiple Airlines
Deal found 28/8£221
Fri 10/1008:40LHR - CWL
1 stop8h 05mKLM
Sun 12/1009:50CWL - LHR
1 stop8h 00mKLM
Deal found 28/8£228
Thu 25/920:10LHR - CWL
1 stop15h 50mMultiple Airlines
Thu 2/1007:55CWL - LHR
1 stop8h 00mMultiple Airlines
Deal found 28/8£232

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Cardiff 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 29 August 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Cardiff that are best for you.

Fly from

Heathrow

Fly to

Cardiff

Route

Depart

Return

Price

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Sat 11/10

21:10-10:35

1 stop13h 25m

Cardiff Wales

Sat 18/10

09:00-20:20

1 stop11h 20m

£170

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Sat 25/10

21:10-10:50

1 stop13h 40m

Cardiff Wales

Wed 29/10

15:55-21:05

1 stop5h 10m

£180

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Mon 13/10

20:50-15:55

2 stops19h 05m

Cardiff Wales

Thu 16/10

07:55-13:25

1 stop5h 30m

£186

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Wed 29/10

19:45-10:05

1 stop14h 20m

Cardiff Wales

Thu 30/10

14:30-21:05

1 stop6h 35m

£191

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Fri 3/10

21:10-07:30

1 stop10h 20m

Cardiff Wales

Tue 7/10

20:20-14:45

2 stops18h 25m

£209

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Fri 26/9

20:10-07:30

1 stop11h 20m

Cardiff Wales

Fri 3/10

12:25-20:20

1 stop7h 55m

£219

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Thu 25/9

15:50-12:00

1 stop20h 10m

Cardiff Wales

Thu 9/10

07:55-12:40

1 stop4h 45m

£221

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Fri 10/10

08:40-16:45

1 stop8h 05m

Cardiff Wales

Sun 12/10

09:50-17:50

1 stop8h 00m

£228

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Sat 27/9

21:10-10:35

1 stop13h 25m

£99

LondonCardiff

LHR - CWL

LHRCWL

London Heathrow

Sun 14/9

09:50-12:45

1 stop26h 55m

£132

Flights are sorted by cheapest return flights first.

Deals found on 28/8

Showing 1-10 of 16 results
1
2

Best time to book a flight from Heathrow to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Heathrow 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 London Heathrow Airport to Cardiff

What is the cheapest month to book a flight from London Heathrow Airport to Cardiff?

Currently, July is the cheapest month in which you can book a flight from London Heathrow Airport to Cardiff (average of £169). Flying from London Heathrow Airport to Cardiff in December is currently the most expensive (average of £263). 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.

What is the cheapest time of day to fly from LHR to CWL?

Find hourly flight availability from Heathrow to Cardiff. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 August 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Cardiff in the afternoon. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight in the morning.

Reviews of airlines servicing Cardiff

Get insights into the airlines that provide service to Cardiff. 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 Cardiff. Reviews last updated 29 August 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Cardiff, such as KLM. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,383 reviews
Check prices

Food

7.3

Overall

7.8

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

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
1,383 reviews
KLM
7.8
Good
1,383 reviews
Check prices

Food

7.3

Overall

7.8

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

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 Heathrow to Cardiff. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Cardiff from London Heathrow?

    Most people fly into Cardiff Wales (CWL) if they book a flight to Cardiff from London Heathrow. On average, Cardiff Wales has 0 inbound flights from London Heathrow per day from 1 airline. Cardiff Wales is conveniently located just 9.1 mi from Cardiff’s city center.

  • What is the cheapest airline to fly from London Heathrow Airport to Cardiff round-trip?

    Cheapflights users have booked flights from London Heathrow Airport to Cardiff round-trip from £195. Users have found that KLM is 46% cheaper than the other options available to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to Cardiff 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 London Heathrow Airport to Cardiff?

    Currently, July is the cheapest month in which you can book a flight from London Heathrow Airport to Cardiff (average of £169). Flying from London Heathrow Airport to Cardiff in December is currently the most expensive (average of £263). 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

Travelling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
Barry
Bridgend

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Heathrow to Cardiff

Discover the top airline that operate flights from Heathrow to Cardiff. 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 29 August 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£195Average£340FlexibilityNo 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 Heathrow to Cardiff?

Deals for Heathrow to Cardiff 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 Heathrow to Cardiff?

Cheapflights simply makes it quick and affordable to book flights from Heathrow to Cardiff 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 Heathrow to Cardiff with no change fees?

Certainly. Search results for flights to Cardiff from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.