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Cheap flights from Cardiff to London from £99

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Cardiff to London departing on 26/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Cardiff to London

Cheap return flights

Logo
09:00 - 20:20CWL-LHR
11h 20m1 stop
Logo
21:10 - 10:35LHR-CWL
13h 25m1 stop
£179
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Sat, 13 Sep - Sat, 20 Sep
Logo
16:20 - 20:20CWL-LHR
4h 00m1 stop
Logo
07:40 - 15:55LHR-CWL
8h 15m1 stop
£184
Find Deal
Tue, 9 Sep - Tue, 16 Sep
Logo
13:10 - 18:55CWL-LHR
5h 45m1 stop
Logo
21:10 - 07:25LHR-CWL
10h 15m1 stop
£200
Find Deal
Mon, 8 Sep - Wed, 10 Sep
Logo
09:00 - 18:20CWL-LHR
9h 20m1 stop
Logo
11:05 - 10:35LHR-CWL
23h 30m2 stops
£206
Find Deal
Sat, 13 Sep - Sat, 20 Sep
Logo
12:25 - 19:25CWL-LHR
7h 00m1 stop
Logo
21:10 - 07:30LHR-CWL
10h 20m1 stop
£207
Find Deal
Fri, 12 Sep - Fri, 19 Sep
KLM Logo
10:20 - 19:15CWL-LHR
8h 55m1 stop
KLM Logo
20:25 - 09:50LHR-CWL
13h 25m1 stop
£256KLM
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Thu, 22 Jan - Sun, 25 Jan
Logo
16:20 - 20:20CWL-LHR
4h 00m1 stop
Logo
16:50 - 09:15LHR-CWL
16h 25m2 stops
£276
Find Deal
Tue, 9 Sep - Tue, 16 Sep
Logo
13:10 - 18:55CWL-LHR
5h 45m1 stop
Logo
19:35 - 16:45LHR-CWL
21h 10m2 stops
£291
Find Deal
Mon, 8 Sep - Wed, 10 Sep
British Airways Logo
09:00 - 21:35CWL-LHR
12h 35m2 stops
British Airways Logo
21:45 - 11:30LHR-CWL
13h 45m2 stops
£735British Airways
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Fri, 12 Sep - Fri, 19 Sep
British Airways Logo
12:00 - 07:30CWL-LHR
19h 30m2 stops
British Airways Logo
14:45 - 11:30LHR-CWL
20h 45m2 stops
£943British Airways
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Sat, 13 Sep - Sat, 20 Sep

British Airways flights from Cardiff to London Heathrow Airport

Our best British Airways deals on Cardiff to London Heathrow Airport flight tickets
British Airways
12 Sept
CWL09:00Cardiff Wales
12h 35m
2 stops
LHR21:35London Heathrow
19 Sept
LHR21:45London Heathrow
13h 45m
2 stops
CWL11:30Cardiff Wales
£735
Find similar
British Airways
31 Jul
CWL12:00Cardiff Wales
8h 45m
1 stop
LHR20:45London Heathrow
7 Aug
LHR07:30London Heathrow
4h 00m
1 stop
CWL11:30Cardiff Wales
£915
Find similar
British Airways
13 Sept
CWL12:00Cardiff Wales
19h 30m
2 stops
LHR07:30London Heathrow
20 Sept
LHR14:45London Heathrow
20h 45m
2 stops
CWL11:30Cardiff Wales
£943
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Cardiff to London Heathrow Airport 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, momondo users made 279,928 searches. Data last updated 31 July 2025.
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 13/9

09:00-20:20

1 stop11h 20m

London Heathrow

Sat 20/9

21:10-10:35

1 stop13h 25m

£179

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 9/9

16:20-20:20

1 stop4h 00m

London Heathrow

Tue 16/9

07:40-15:55

1 stop8h 15m

£184

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 8/9

13:10-18:55

1 stop5h 45m

London Heathrow

Wed 10/9

21:10-07:25

1 stop10h 15m

£200

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 13/9

09:00-18:20

1 stop9h 20m

London Heathrow

Sat 20/9

11:05-10:35

2 stops23h 30m

£206

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 12/9

12:25-19:25

1 stop7h 00m

London Heathrow

Fri 19/9

21:10-07:30

1 stop10h 20m

£207

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Thu 22/1

10:20-19:15

1 stop8h 55m

London Heathrow

Sun 25/1

20:25-09:50

1 stop13h 25m

£256

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Tue 9/9

16:20-20:20

1 stop4h 00m

London Heathrow

Tue 16/9

16:50-09:15

2 stops16h 25m

£276

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Mon 8/9

13:10-18:55

1 stop5h 45m

London Heathrow

Wed 10/9

19:35-16:45

2 stops21h 10m

£291

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Fri 12/9

09:00-21:35

2 stops12h 35m

London Heathrow

Fri 19/9

21:45-11:30

2 stops13h 45m

£735

CardiffLondon

CWL - LHR

CWLLHR

Cardiff Wales

Sat 13/9

12:00-07:30

2 stops19h 30m

London Heathrow

Sat 20/9

14:45-11:30

2 stops20h 45m

£943

Flights are sorted by cheapest return flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
1
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See travel insights to London from

How to get the cheapest flight ticket from Cardiff to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Cardiff is on a Thursday. momondo users have found tickets for Thursday departures for as low as £912. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £1,049.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Cardiff to London Heathrow Airport in the morning for as low as £657. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £1,275 on average. Flights to London Heathrow Airport from Cardiff in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Cardiff Wales to London Heathrow flight route?

Fly from Cardiff Wales to London Heathrow for the best Cardiff Wales - London Heathrow flight prices

What cabin class options are available on Cardiff Wales to London Heathrow flights?

There are 1 cabin classes available to choose from on Cardiff Wales to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

When to book flights from Cardiff to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Cardiff to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Cardiff to London Heathrow Airport (CWL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Cardiff to London Heathrow Airport

Best price found

£99

Fastest flight time

4h 00m

Direct flights

None
The best one-way flight to London Heathrow Airport from Cardiff in the past 72 hours is £99. The best return flight deal from Cardiff to London Heathrow Airport found on momondo in the last 72 hours is £179.
The fastest flight from Cardiff to London Heathrow Airport takes 4h 00m
There are no direct flights from Cardiff to London Heathrow Airport. Popular non-direct route for this connection is Cardiff Wales Airport - London Heathrow Airport.
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  • How far is Cardiff Wales to London Heathrow by plane?

    Cardiff Wales and London Heathrow are 117.1 mi apart from one another. Typically, this will take 4h 00m by plane in normal conditions.

  • When did momondo last update prices for flights from Cardiff Wales Airport to London Heathrow Airport?

    Prices for flights from Cardiff Wales Airport to London Heathrow Airport refresh daily.

  • How many operators does momondo search for flights from Cardiff Wales Airport to London Heathrow Airport?

  • How old do you have to be to fly from Cardiff Wales Airport to London Heathrow Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Cardiff Wales Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Cardiff to London Heathrow Airport?

Best airlines flying from Cardiff to London Heathrow Airport

Compare and see reviews for airlines that fly from Cardiff to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom £221Free CancellationRating
7.8
1,383 reviews
Search KLM flights

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Why use momondo?

Why should I use momondo to find a flight deal from Cardiff to London?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Cardiff to London for you.

Can I find flights from Cardiff to London with flexible booking policies on momondo?

momondo does allow users to show only those flights to London from Cardiff which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Cardiff to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Cardiff.

I’m not ready to book a flight from Cardiff to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Cardiff and alert you when they change.

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