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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 20/3. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — LHR
20 Mar — 27 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap 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 18 February 2026.

Mon 2/323:30
CWL
-
LHR
1 stop9h 35m
Multiple Airlines
Fri 6/316:20
LHR
-
CWL
1 stop5h 40m
Multiple Airlines
Deal found 15/2£176
Wed 11/315:55
CWL
-
LHR
1 stop5h 10m
Multiple Airlines
Fri 27/317:45
LHR
-
CWL
1 stop4h 15m
Multiple Airlines
Deal found 16/2£180
Thu 5/321:55
CWL
-
LHR
1 stop10h 10m
Multiple Airlines
Mon 9/317:45
LHR
-
CWL
1 stop5h 20m
Multiple Airlines
Deal found 18/2£196
Thu 30/422:50
CWL
-
LHR
1 stop9h 15m
Multiple Airlines
Mon 4/513:45
LHR
-
CWL
2 stops20h 05m
Multiple Airlines
Deal found 16/2£206
Thu 2/422:50
CWL
-
LHR
1 stop10h 15m
Multiple Airlines
Thu 9/415:10
LHR
-
CWL
1 stop7h 15m
Multiple Airlines
Deal found 16/2£209
Wed 18/315:55
CWL
-
LHR
1 stop5h 10m
Multiple Airlines
Wed 25/307:50
LHR
-
CWL
1 stop7h 40m
Multiple Airlines
Deal found 16/2£224
Mon 16/323:30
CWL
-
LHR
2 stops11h 15m
Multiple Airlines
Mon 23/311:45
LHR
-
CWL
2 stops11h 20m
Multiple Airlines
Deal found 16/2£239
Tue 30/609:45
CWL
-
LHR
1 stop11h 10m
KLM
Wed 12/806:30
LHR
-
CWL
1 stop10h 15m
KLM
Deal found 16/2£262

Find 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 18 February 2026.

Round-trip from

£176

One-way from

£84

Popular in

June

Cheapest in

May

Average price

£340

Good round-trip deal

£832 or less
2/3-6/3
  • 2/3-6/3
  • 2 total stops
  • 15h 15m total
  • Cardiff to London
Search Deals
20/3
  • 20/3
  • 1 total stop
  • 9h 40m total
  • Cardiff to London
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Cardiff Wales to London Heathrow.
Search Deals

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 18 February 2026.
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 2/3

23:30-09:05

1 stop9h 35m

London Heathrow

Fri 6/3

16:20-22:00

1 stop5h 40m

£176

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Wed 11/3

15:55-21:05

1 stop5h 10m

London Heathrow

Fri 27/3

17:45-22:00

1 stop4h 15m

£180

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 16/3

23:30-09:05

1 stop9h 35m

London Heathrow

Mon 23/3

17:45-23:05

1 stop5h 20m

£180

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 5/3

21:55-08:05

1 stop10h 10m

London Heathrow

Mon 9/3

17:45-23:05

1 stop5h 20m

£196

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 30/4

22:50-08:05

1 stop9h 15m

London Heathrow

Mon 4/5

13:45-09:50

2 stops20h 05m

£206

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Wed 18/3

15:55-21:05

1 stop5h 10m

London Heathrow

Wed 25/3

07:50-15:30

1 stop7h 40m

£224

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 30/6

09:45-20:55

1 stop11h 10m

London Heathrow

Wed 12/8

06:30-16:45

1 stop10h 15m

£262

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 2/4

22:50-08:05

1 stop9h 15m

London Heathrow

Thu 9/4

08:05-22:25

2 stops14h 20m

£270

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 20/3

22:25-08:05

1 stop9h 40m

£84

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sun 29/3

21:45-08:05

1 stop10h 20m

£92

Flights are sorted by cheapest return flights first.

Deals found on 17/2

Showing 1-10 of 12 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 £208). Flying from Cardiff to London Heathrow Airport in May is currently the most expensive (average of £419). 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 18 February 2026.

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 38% on your trip compared to booking a flight in the evening.

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 0 airlines. Cardiff Wales is conveniently located just 9.1 mi from Cardiff’s city center.

  • What are the cheapest flights from Cardiff to London Heathrow Airport?

    On average you can expect to pay £832 for a flight from Cardiff to London Heathrow Airport. The cheapest flight overall is £581 while the most popular route, (Cardiff Wales - London Heathrow) is currently priced at £180.

  • 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 £208). Flying from Cardiff to London Heathrow Airport in May is currently the most expensive (average of £419). 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
Luton
Croydon
Wembley
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Swindon
Bedford

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

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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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