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Cheap flights from Cardiff to London Heathrow Airport from £84

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 18/12. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — LHR
6 Dec — 13 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Cardiff to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Heathrow (LHR). 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 6 November 2025.

Round-trip from

£190

One-way from

£84

Popular in

June

Cheapest in

May

Average price

£384
24/11-26/11
  • 24/11-26/11
  • 2 total stops
  • 17h 15m total
  • Cardiff to London
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18/12
  • 18/12
  • 1 total stop
  • 4h 35m total
  • Cardiff to London
Search Deals
High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 7% potential price decrease (£19 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find flight deals from Cardiff to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Cardiff to Heathrow
Explore the most affordable flight options available from Cardiff to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 November 2025.

Mon 24/1123:30CWL - LHR
1 stop9h 35mMultiple Airlines
Wed 26/1107:50LHR - CWL
1 stop7h 40mMultiple Airlines
Deal found 3/11£190
Tue 23/1222:00CWL - LHR
1 stop11h 05mMultiple Airlines
Tue 30/1220:45LHR - CWL
1 stop10h 15mMultiple Airlines
Deal found 5/11£194
Thu 18/1216:30CWL - LHR
1 stop4h 35mMultiple Airlines
Thu 25/1218:50LHR - CWL
2 stops20h 50mMultiple Airlines
Deal found 3/11£209
Thu 20/1110:30CWL - LHR
1 stop5h 05mMultiple Airlines
Mon 24/1117:45LHR - CWL
1 stop5h 20mMultiple Airlines
Deal found 5/11£223
Fri 21/1122:25CWL - LHR
1 stop9h 40mMultiple Airlines
Mon 8/1217:45LHR - CWL
1 stop5h 20mMultiple Airlines
Deal found 5/11£232
Mon 10/1123:30CWL - LHR
1 stop13h 55mMultiple Airlines
Mon 17/1117:45LHR - CWL
1 stop5h 20mMultiple Airlines
Deal found 3/11£242
Fri 19/1222:25CWL - LHR
1 stop9h 40mMultiple Airlines
Fri 26/1216:20LHR - CWL
1 stop5h 40mMultiple Airlines
Deal found 4/11£243
Tue 18/1116:45CWL - LHR
2 stops26h 05mMultiple Airlines
Sat 22/1107:50LHR - CWL
1 stop11h 50mMultiple Airlines
Deal found 3/11£245
Tue 30/1222:00CWL - LHR
1 stop10h 05mMultiple Airlines
Thu 1/109:50LHR - CWL
1 stop6h 15mMultiple Airlines
Deal found 4/11£255
Sat 20/1223:45CWL - LHR
1 stop8h 20mMultiple Airlines
Sat 27/1207:50LHR - CWL
1 stop11h 50mMultiple Airlines
Deal found 5/11£256

Cheapflights Fare Finder

 
Customise your flight search to find flights from Cardiff to Heathrow 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 6 November 2025.
Use the filters below to find and compare flights from Cardiff to London Heathrow Airport that are best for you.

Fly from

Cardiff

Fly to

Heathrow

Route

Depart

Return

Price

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 24/11

23:30-09:05

1 stop9h 35m

London Heathrow

Wed 26/11

07:50-15:30

1 stop7h 40m

£190

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 23/12

22:00-09:05

1 stop11h 05m

London Heathrow

Tue 30/12

20:45-07:00

1 stop10h 15m

£194

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 20/11

10:30-15:35

1 stop5h 05m

London Heathrow

Mon 24/11

17:45-23:05

1 stop5h 20m

£223

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 21/11

22:25-08:05

1 stop9h 40m

London Heathrow

Mon 8/12

17:45-23:05

1 stop5h 20m

£232

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 19/12

22:25-08:05

1 stop9h 40m

London Heathrow

Fri 26/12

16:20-22:00

1 stop5h 40m

£243

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 18/11

16:45-18:50

2 stops26h 05m

London Heathrow

Sat 22/11

07:50-19:40

1 stop11h 50m

£245

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 13/3

17:15-20:50

1 stop3h 35m

London Heathrow

Wed 18/3

10:00-16:55

1 stop6h 55m

£247

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 30/12

22:00-08:05

1 stop10h 05m

London Heathrow

Thu 1/1

09:50-16:05

1 stop6h 15m

£255

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 20/12

23:45-08:05

1 stop8h 20m

London Heathrow

Sat 27/12

07:50-19:40

1 stop11h 50m

£256

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Wed 26/11

15:55-21:05

1 stop5h 10m

London Heathrow

Fri 28/11

17:05-19:40

2 stops26h 35m

£262

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 15 results
1
2

Best time to book a flight from Cardiff to Heathrow

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

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

Currently, September is the cheapest month in which you can book a flight from Cardiff to London Heathrow Airport (average of £217). Flying from Cardiff to London Heathrow Airport in August is currently the most expensive (average of £374). 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 CWL to LHR?

Find hourly flight availability from Cardiff to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 November 2025.

A simple way to save on the total cost of your ticket is to fly from Cardiff to London Heathrow Airport in the morning. If you’re flexible enough to do this you can expect to save up to 45% on your trip compared to booking a flight in the evening.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 6 November 2025.
Get a feel of what it's like to fly with KLM from Cardiff to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,405 reviews
Check prices

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,405 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Crew

8.4

Comfort

7.7

Food

7.3

Entertainment

7.1

Boarding

7.8

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from Cardiff to Heathrow. 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 from for flights from Cardiff to London Heathrow?

    Most people fly from Cardiff Wales (CWL) if they book a flight from Cardiff to London Heathrow. On average, Cardiff Wales has 0 outbound flights to 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 Cardiff to London Heathrow Airport round-trip?

    According to our current data, KLM (£226), offers the cheapest pricing from Cardiff to London Heathrow Airport.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Cardiff to London Heathrow Airport (average of £217). Flying from Cardiff to London Heathrow Airport in August is currently the most expensive (average of £374). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Slough
Gatwick
Hounslow
Northampton
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Winchester
Swindon
Crawley
Brentford
Romford
Chichester
Ipswich

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Cardiff to Heathrow

Discover the top airline that operate flights from Cardiff to Heathrow. 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 6 November 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£226Average£298FlexibilityNo 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 Heathrow?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Cardiff today with Cheapflights!

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

Cheapflights helps you find that perfect flight to Heathrow from Cardiff by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Cardiff to Heathrow flexibly with Cheapflights today.

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

Yes, Cheapflights offers price alerts on Cardiff to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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