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

According to our current data, KLM (£217), offers the cheapest pricing from Cardiff to London Heathrow Airport. Users have found that KLM is 39% cheaper than the other options available to this destination.

What is the cheapest day to fly from Cardiff to London Heathrow Airport?

Travellers seeking maximum savings on their Cardiff to London Heathrow Airport flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

On average you can expect to pay £711 for a flight from Cardiff to London Heathrow Airport. The cheapest flight overall is £519 while the most popular route, (Cardiff Wales - London Heathrow) is currently priced at £184.

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

Leaving on a Sunday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 55% on the overall cost on flights from Cardiff to London Heathrow Airport.

What is the cheapest month to fly from Cardiff to London Heathrow Airport?

Flights from Cardiff to London Heathrow Airport lean towards being more expensive in June. Prices are generally better when you fly from Cardiff to London Heathrow Airport in May, with the cheapest ticket starting at £105.

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.

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.

£178+ Flights from Cardiff to London Heathrow Airport

Cheap flight deals from Cardiff to Heathrow

Round-trip from	£181
One-way from	£178
Popular in	August
Cheapest in	February
Average price	£591
Good round-trip deal	£531 or less

20/9-24/9
2 total stops
21h 35m total
Cardiff to London

Search Deals

British Airways
27/9
1 total stop
8h 20m total
Cardiff to London

Search Deals

Highest demand for flights based on searches. 14% potential increase in price (£45 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease (£18 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2025

Search Deals

Price to beat on a round-trip flight from Cardiff Wales to London Heathrow.

Search Deals

Find flight deals from Cardiff to Heathrow

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 15 August 2025.

Sat 20/909:00CWL - LHR

1 stop11h 20mMultiple Airlines

Wed 24/921:10LHR - CWL

1 stop10h 15mMultiple Airlines

Deal found 14/8£181

Tue 16/916:20CWL - LHR

1 stop17h 45mMultiple Airlines

Tue 23/908:50LHR - CWL

1 stop7h 05mMultiple Airlines

Deal found 14/8£215

Fri 12/912:25CWL - LHR

1 stop6h 30mMultiple Airlines

Fri 19/907:40LHR - CWL

1 stop4h 20mMultiple Airlines

Deal found 13/8£226

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Tue 6/108:40LHR - CWL

1 stop8h 05mKLM

Deal found 14/8£243

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Mon 5/110:00LHR - CWL

1 stop6h 45mKLM

Deal found 14/8£269

Wed 10/909:50CWL - LHR

1 stop7h 45mKLM

Wed 17/911:45LHR - CWL

1 stop5h 00mKLM

Deal found 13/8£280

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Sun 4/120:25LHR - CWL

1 stop13h 25mKLM

Deal found 14/8£286

Fri 26/1210:20CWL - LHR

1 stop10h 30mKLM

Mon 5/120:25LHR - CWL

1 stop13h 25mKLM

Deal found 14/8£299

Thu 11/907:55CWL - LHR

1 stop5h 30mMultiple Airlines

Thu 18/921:10LHR - CWL

2 stops36h 00mMultiple Airlines

Deal found 14/8£325

Best flights from Cardiff to Heathrow
Discover carefully curated flight deals from Cardiff to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 August 2025.

Sat 20/909:00CWL - LHR

1 stop11h 20mMultiple Airlines

Wed 24/921:10LHR - CWL

1 stop10h 15mMultiple Airlines

Deal found 14/8£181

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Tue 6/108:40LHR - CWL

1 stop8h 05mKLM

Deal found 14/8£243

Tue 16/916:20CWL - LHR

1 stop17h 45mMultiple Airlines

Tue 23/908:50LHR - CWL

1 stop7h 05mMultiple Airlines

Deal found 14/8£215

Fri 12/912:25CWL - LHR

1 stop6h 30mMultiple Airlines

Fri 19/907:40LHR - CWL

1 stop4h 20mMultiple Airlines

Deal found 13/8£226

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Mon 5/110:00LHR - CWL

1 stop6h 45mKLM

Deal found 14/8£269

Wed 10/909:50CWL - LHR

1 stop7h 45mKLM

Wed 17/911:45LHR - CWL

1 stop5h 00mKLM

Deal found 13/8£280

Thu 25/1210:20CWL - LHR

1 stop10h 30mKLM

Sun 4/120:25LHR - CWL

1 stop13h 25mKLM

Deal found 14/8£286

Thu 11/907:55CWL - LHR

1 stop5h 30mMultiple Airlines

Thu 18/921:10LHR - CWL

2 stops36h 00mMultiple Airlines

Deal found 14/8£325

Fri 26/1210:20CWL - LHR

1 stop10h 30mKLM

Mon 5/120:25LHR - CWL

1 stop13h 25mKLM

Deal found 14/8£299

Last-minute flights from Cardiff to Heathrow
Discover last-minute flight deals from Cardiff to Heathrow. Data last updated 15 August 2025 and is based on user searches.

Thu 21/807:55CWL - LHR

1 stop4h 45mMultiple Airlines

Sat 23/821:10LHR - CWL

1 stop13h 25mMultiple Airlines

Deal found 15/8£409

Wed 10/909:50CWL - LHR

1 stop7h 45mKLM

Wed 17/911:45LHR - CWL

1 stop5h 00mKLM

Deal found 13/8£280

Wed 10/912:00CWL - LHR

1 stop5h 25mMultiple Airlines

Wed 17/907:40LHR - CWL

1 stop3h 50mMultiple Airlines

Deal found 13/8£355

Thu 11/907:55CWL - LHR

1 stop5h 30mMultiple Airlines

Thu 18/921:10LHR - CWL

2 stops36h 00mMultiple Airlines

Deal found 14/8£325

Fri 12/912:25CWL - LHR

1 stop6h 30mMultiple Airlines

Fri 19/907:40LHR - CWL

1 stop4h 20mMultiple Airlines

Deal found 13/8£226

Tue 16/916:20CWL - LHR

1 stop17h 45mMultiple Airlines

Tue 23/908:50LHR - CWL

1 stop7h 05mMultiple Airlines

Deal found 14/8£215

Sat 20/909:00CWL - LHR

1 stop11h 20mMultiple Airlines

Wed 24/921:10LHR - CWL

1 stop10h 15mMultiple Airlines

Deal found 14/8£181

Cheapflights Fare Finder

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

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 20/9

09:00-20:20

1 stop11h 20m

London Heathrow

Wed 24/9

21:10-07:25

1 stop10h 15m

£181

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 16/9

16:20-10:05

1 stop17h 45m

London Heathrow

Tue 23/9

08:50-15:55

1 stop7h 05m

£215

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 12/9

12:25-18:55

1 stop6h 30m

London Heathrow

Fri 19/9

07:40-12:00

1 stop4h 20m

£226

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 25/12

10:20-20:50

1 stop10h 30m

London Heathrow

Tue 6/1

08:40-16:45

1 stop8h 05m

£243

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 25/12

10:20-20:50

1 stop10h 30m

London Heathrow

Mon 5/1

10:00-16:45

1 stop6h 45m

£269

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Wed 10/9

09:50-17:35

1 stop7h 45m

London Heathrow

Wed 17/9

11:45-16:45

1 stop5h 00m

£280

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 25/12

10:20-20:50

1 stop10h 30m

London Heathrow

Sun 4/1

20:25-09:50

1 stop13h 25m

£286

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 26/12

10:20-20:50

1 stop10h 30m

London Heathrow

Mon 5/1

20:25-09:50

1 stop13h 25m

£299

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 11/9

07:55-13:25

1 stop5h 30m

London Heathrow

Thu 18/9

21:10-09:10

2 stops36h 00m

£325

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 27/9

12:00-20:20

1 stop8h 20m

£178

Flights are sorted by cheapest return flights first.

Deals found on 13/8

Showing 1-10 of 11 results

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, January is the cheapest month in which you can book a flight from Cardiff to London Heathrow Airport (average of £112). Flying from Cardiff to London Heathrow Airport in August is currently the most expensive (average of £164). 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?

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 55% on your trip compared to booking a flight at midday.

Reviews of airlines servicing Heathrow

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

7.8

Good

1,384 reviews

Check prices

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

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

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 (£217), offers the cheapest pricing from Cardiff to London Heathrow Airport. Users have found that KLM is 39% cheaper than the other options available to this destination.
What are the cheapest flights from Cardiff to London Heathrow Airport?
On average you can expect to pay £711 for a flight from Cardiff to London Heathrow Airport. The cheapest flight overall is £519 while the most popular route, (Cardiff Wales - London Heathrow) is currently priced at £184.
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, January is the cheapest month in which you can book a flight from Cardiff to London Heathrow Airport (average of £112). Flying from Cardiff to London Heathrow Airport in August is currently the most expensive (average of £164). 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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Gatwick

Slough

Northampton

Deal

Luton

Wembley

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Hayes

Ipswich

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Winchester

Folkestone

Eastbourne

Maidstone

Watford

Chichester

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Cardiff to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
KLM	Cheapest£217	Average£388	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Fly with Cheapflights

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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Cheap flights from Cardiff to London Heathrow Airport from £178

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.

Cheap flight deals from Cardiff to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Find flight deals from Cardiff to Heathrow

Cheapest flights from Cardiff to HeathrowExplore 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 15 August 2025.

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 15 August 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Cardiff to London Heathrow Airport that are best for you.

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.

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?

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 15 August 2025.

Reviews of airlines servicing Heathrow

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.

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?

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

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

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

How can I find direct flights from Cardiff to Heathrow?

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

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

Travelling to a place near London Heathrow Airport?

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.

Alternative routes for Cardiff to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Cardiff to Heathrow

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?

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

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

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

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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 15 August 2025.