Cheap flights from Cardiff to London from £100
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 22/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customise your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Cardiff to London
Cheap return flights
Cheap one-way flights
British Airways flights from Cardiff to London Heathrow Airport
Our best British Airways deals on Cardiff to London Heathrow Airport flight tickets
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 £894. 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 £2,125.
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 evening. momondo users have found flights departing from Cardiff to London Heathrow Airport in the evening for as low as £977. 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 £1,028 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
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
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 3h 35m 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?
As of June 2025, there is 1 operator available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Cardiff to London Heathrow Airport is KLM (100% of total bookings).
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 | ||
|---|---|---|---|---|---|
| PriceFrom £221 | Free Cancellation | Rating 7.8 1,358 reviews |
Travelling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy 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.