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Cheap flights from Cardiff to London Heathrow Airport from £125

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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — LHR
21 Apr — 28 Apr1
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 22 March 2026.

Thu 16/422:50
CWL
-
LHR
1 stop9h 15m
Multiple Airlines
Thu 23/416:50
LHR
-
CWL
1 stop5h 35m
Multiple Airlines
Deal found 19/3£165
Fri 17/422:45
CWL
-
LHR
1 stop9h 20m
Multiple Airlines
Fri 24/421:10
LHR
-
CWL
1 stop9h 45m
Multiple Airlines
Deal found 20/3£177
Wed 1/423:30
CWL
-
LHR
1 stop8h 35m
Multiple Airlines
Sun 5/416:50
LHR
-
CWL
1 stop4h 30m
Multiple Airlines
Deal found 17/3£208
Sun 19/421:45
CWL
-
LHR
1 stop10h 20m
Multiple Airlines
Sun 26/415:10
LHR
-
CWL
1 stop6h 10m
Multiple Airlines
Deal found 22/3£220
Sat 4/407:30
CWL
-
LHR
1 stop9h 50m
Multiple Airlines
Sun 5/415:50
LHR
-
CWL
1 stop5h 30m
Multiple Airlines
Deal found 18/3£252
Mon 6/422:10
CWL
-
LHR
1 stop15h 45m
Multiple Airlines
Fri 10/421:10
LHR
-
CWL
1 stop9h 45m
Multiple Airlines
Deal found 22/3£253
Sun 3/521:45
CWL
-
LHR
1 stop10h 20m
Multiple Airlines
Sun 10/516:50
LHR
-
CWL
1 stop4h 30m
Multiple Airlines
Deal found 19/3£259
Mon 4/522:10
CWL
-
LHR
1 stop9h 55m
Multiple Airlines
Mon 11/515:50
LHR
-
CWL
1 stop5h 55m
Multiple Airlines
Deal found 20/3£260

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 22 March 2026.

Round-trip from

£165

One-way from

£125
16/4-23/4
  • 16/4-23/4
  • 2 total stops
  • 14h 50m total
  • Cardiff to London
Search Deals
1/8
  • 1/8
  • 1 total stop
  • 6h 00m total
  • Cardiff to London
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 22 March 2026.
Use the filters below to find and compare flights from Cardiff to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 16/4

22:50-08:05

1 stop9h 15m

London Heathrow

Thu 23/4

16:50-22:25

1 stop5h 35m

£165

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sun 19/4

21:45-08:05

1 stop10h 20m

London Heathrow

Sun 26/4

15:10-21:20

1 stop6h 10m

£220

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 4/4

07:30-17:20

1 stop9h 50m

London Heathrow

Sun 5/4

15:50-21:20

1 stop5h 30m

£252

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 6/4

22:10-13:55

1 stop15h 45m

London Heathrow

Fri 10/4

21:10-06:55

1 stop9h 45m

£253

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 4/4

07:30-20:20

1 stop12h 50m

London Heathrow

Wed 8/4

15:50-23:05

1 stop7h 15m

£276

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 4/5

22:10-08:05

1 stop9h 55m

London Heathrow

Mon 11/5

16:50-21:45

1 stop4h 55m

£290

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Wed 1/4

23:30-08:05

1 stop8h 35m

London Heathrow

Sun 5/4

08:40-21:20

2 stops12h 40m

£295

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 18/4

12:00-20:20

1 stop8h 20m

London Heathrow

Sat 25/4

07:30-11:30

1 stop4h 00m

£358
Fastest return journey

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 21/4

12:00-17:45

1 stop5h 45m

London Heathrow

Wed 22/4

07:40-11:30

1 stop3h 50m

£361

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 2/5

07:30-19:25

1 stop11h 55m

London Heathrow

Sat 9/5

07:40-17:05

2 stops9h 25m

£364

Flights are sorted by cheapest return flights first.

Deals found on 17/3

Showing 1-10 of 13 resultsSorted by cheapest first
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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 £211). Flying from Cardiff to London Heathrow Airport in May is currently the most expensive (average of £425). 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 22 March 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.

  • 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 £211). Flying from Cardiff to London Heathrow Airport in May is currently the most expensive (average of £425). 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
Wembley
Croydon
Northampton
Luton
Hounslow
Slough
Gatwick
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Romford
Ipswich
Swindon
Bedford

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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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