Gateways to Europe: How to take a train from London Heathrow

Heathrow Airport is comparatively close to central London, but it has an awkward location on Britain's rail network.
The main rail routes from London to the west of England, South Wales and the South-west pass to the north and the south, leaving connections with the city centre as the airport's only rail link.

In contrast Manchester airport has direct trains to / from a swathe of other cities including Edinburgh, Glasgow, Leeds, Liverpool and York - Plus direct links with tourist areas including the Lake District and North Wales.

Birmingham Airport has rail links which include trains to from Mid and North Wales, Bournemouth, Edinburgh, Glasgow, Manchester, Oxford and Southampton.

London's second airport Gatwick is served by trains to and from dozens of locations across south-east England, including Brighton, Cambridge, Chichester, Hastings and Portsmouth.

Though when flying into Europe for a holiday beyond London, using Heathrow can be a much cheaper, or the only, direct flight option.
Hence this guide to how to travel from Heathrow on to destinations across England, Scotland and Wales - and beyond, by train!

Use the Contents menu to jump to the info you need.

Five things which are good to know

(1) The Elizabeth line and the Heathrow Express depart from the same platforms / stations at Heathrow.
The next train to depart can be a Heathrow Express or an Elizabeth line service, so check the departure indicators, listen for announcements and check the exterior of the trains.
If you board a Heathrow Express train having tapped the ticket gate and not specifically purchased a Heathrow Express ticket, your journey won't be valid.
If you board an Elizabeth line train with a Heathrow Express ticket, you will have wasted the extra money you have paid to take the Heathrow Express.

(2) At Terminals 2, 3 and 4 the Piccadilly line is accessed through a separate Underground station - Also the Piccadilly is an Underground line, but the Elizabeth line isn't
This can matter because they are manage separately too, if there's a problem with the Elizabeth line etc it's good to know that a different option is available, by heading to the Underground instead.

(3) Terminals 2 and 3 don't have their own separate stations.
Instead there is a passage beneath street level which links the two terminals and in this passage there are separate entrances to the Underground station and the station used by the Elizabeth line and Heathrow Express trains.

(4) Note that this station for the Elizabeth line and Heathrow Express can be called both Heathrow Central and Heathrow Terminals 2 and 3.

(5) The access to and from the trains at all of the Heathrow stations is step-free.

An essential planning tip:

At the risk of stating the obvious it's best to look up your rail journey options before you book your flight.

One of the ticks in  the 'why taking a train can be a good option in Britain box', is the frequency of the services.
All of the UK routes below have trains departing at least hourly and most of them have trains every 30 mins.

However, you won't be able to make a planned journey at all if there isn't enough time between a flight arrival and making the final train departure of the day
Avoiding having to rely on that final connection is also a good idea, as adding an hour or two of contingency time is pretty much essential.

Also  on Sunday mornings the first trains of the day on to a final destination may not be departing until after 09:00am.

The Heathrow to Eurostar Connection

I know from the weight of questions I've had from ShowMeTheJourney users that making the transfer between Heathrow and Eurostar's London terminal at St Pancras International is a popular, but confusing route.

The combination of a  long-haul flight to Heathrow from outside Europe + a  Eurostar ticket can be cheaper than flying direct to the likes of Amsterdam. Brussels and Paris.

Plus for those who'll be flying in and out of Heathrow to follow a Eurail pass itinerary, it's usually less risky in terms of making connections, to stay in London after the rail travel adventure and pre-homeward flight.

Hence heading to a Eurostar from a Heathrow flight arrival can be a logical way to go - plus the optimum routes to take are comparatively straightforward.

What not to do

When looking up a Heathrow to St Pancras International route on a Journey Planning tool including Conductor Sam, more often than not, the top suggestion is to make a connection between trains at London Paddington station.

Because at face value it makes sense, both the Elizabeth line and the Heathrow Express trains go to Paddington; And both the Circle and Hammersmith & City lines of the Underground connect Paddington to St Pancras.

However, three factors which are tricky for the likes of Chat GPT, Conductor Sam and Gemini to pick up on are:

1. The connection at Paddington is comparatively awkward - It's a vast labyrinth of a station, with the Elizabeth line and the Underground connections on to St Pancras being at opposite sides of the station. Making the transfer will take around five minutes and involve taking three lifts/elevators, or four sets of escalators.
2. The shortest route between a Heathrow Express arrival and the Underground station used by the Circle / Hammersmith & City lines, is by taking stairs.
3. A short staircase has to be used to reach the exits, when the Underground train arrives at King's Cross St Pancras station.

However, two much less awkward alternatives are typically available.

Elizabeth line or Piccadilly line

When travelling between Heathrow and Eurostar, what's easier than making a connection at Paddington is:

(1) Making a connection between the Elizabeth line and Thameslink trains at Farringdon station - so that you get to/from the Eurostar without using the Underground.
Board towards the rear of the Elizabeth line train and you'll be closer to the transfer at Farringdon.

OR

(2) Going direct from Heathrow to St Pancras on the Piccadilly line of the Underground.

Journey time:
From Heathrow Terminals 2 and 3

• Elizabeth line + Thameslink = 40 mins (I have verified this)
• Piccadilly line = 50 mins (minimum)

Though at Terminal 2 the Underground station for the Piccadilly line is closer than than the station used by the Elizabeth line and Heathrow Express.
Conversely at Terminal 3 the station used by the Piccadilly line is farther away.

Frequency:

• Elizabeth line + Thameslink = 6 x trains per hour from Terminals Two and Three; 4 x trains per hour from Terminal Four; 2 x trains per hour from Terminal Five
• Piccadilly line = aprrox 25 x trains per hour from Terminals Two and Three; approx 10 x trains per hour from Terminal Four; approx 15 x trains per hour from Terminal Five.

Cost:

• Elizabeth line + Thameslink = £13.30
• Piccadilly line = £5.60

These are the prices when tapping bank cards / travel apps on the ticket gates - There's no need to buy tickets and it's actually more expensive to do so.
In contrast buying a Heathrow Express ticket at the airport + the Underground ticket at Paddington will cost £28.

Quality of journey:

• Elizabeth line + Thameslink = no luggage racks on the Elizabeth line trains, but they are full size trains, so they are comparatively spacious and quiet. They also have air-conditioning.
• Piccadilly line = the trains are smaller and they pick up the vibrations from the tracks so they are noisier. Though brand new trains are being introduced which are smarter and have air-conditioning.

Both the Elizabeth and Piccadilly line trains commence their journeys at Heathrow so finding seats on the trains when boarding won't be a problem.

Ease of Journey:
The step-free routes after boarding the train at Heathrow are:

• Elizabeth line + Thameslink = at Farringdon there will be a choice between one long escalator or two elevators / lifts; At St Pancras there's a choice between two short escalators or one elevator.
• Piccadilly line at King's Cross St Pancras = one long escalator + either two short flights of stairs, or two short elevator rides.

The route to take when stepping off the Piccadilly line at King's Cross St Pancras is to ignore the sings pointing to 'the Trains'.

Instead head for the Hammermith & City line at Euston Road. as the shortest route by around 3 mins to Eurostar departures, is by passing through the Hammersmith & City line lobby.

Go that way and the transfer time will be around 2 mins, which is similar to the transfer time from the Thameslink station.  

In summary:

Despite the need to make a connection at Farringdon, taking the Elizabeth line is faster and more comfortable
Plus when you get to St Pancras the route is a little easier to follow, compared to taking the Piccadilly line.
However, that all comes at cost, as the ticket price for taking the Piccadilly is more than 50% cheaper.

Planning a journey from Heathrow to Eurostar Departures

How long should I allow from flight arrival at Heathrow to departing by Eurostar from St Pancras is something ShowMeTheJourney users often ask me.
It's also a question that Chat GPT and Conductor Sam can struggle with, because when they are asked for timings, AI based solutions typically work off the departure times of the trains without factoring the check-in times.

Similar to taking international flights from airports, departing by Eurostar from St Pancras International involves a chain of queuing for check-in desks, luggage screening and passport / customs control.
Hence a recommendation to be at St Pancras International station 75 mins prior to departure if you will be travelling with Standard or Plus tickets - Or 45mins prior if you have booked Premier tickets.
Having passed through Eurostar departures twice in the past 6 months, I know that this recommended time isn't excessive.

Add an hour to those 75 / 45 mins for the rail train journey, to allow for some contingency + then the  final element of the sum = the time from the plane arriving at the gate, to being on the platform, awaiting the train's departure.

However, the timing of the plane to train transfer needs to be estimated.
It depends on multiple factors including how busy Heathrow is at the time; and that all is working as it should.
So it can take anything from 10 mins to 90 mins plus to pass through passport control.

Hence allowing 120 mins (two hours) for the plane to train transfer + 60 mins for the rail journey + 75 mins at St Panrcas = an optimum minimum of 4hr 15mins between flight arrival and Eurostar departure.

If you then happen to breeze through flight arrivals in 45 mins or less, you'll then have more than an hour to have something to eat / drink in St Pancras International.

Though if you arrive at St Pancras early you should still head to the Eurostar check-in 75 mins prior to departure if you will be travelling with Standard or Plus tickets, or 45mins prior if you have booked Premier tickets.

From Heathrow to Locations across Britain

If you will be heading on to a more distant location from Heathrow, other than a connecting flight to Aberdeen, Edinburgh, Glasgow, Manchester or Newcastle, the onward journey options are:

1. By train to a London terminus for an onward rail connection.
2. A RailAir link bus to the stations in Guilford, Reading, Watford and Woking - which are all located on main line rail routes from London.
3. By National Express bus - destinations it serves with a direct link include Aberystwyth, Bath, Bournemouth, Bradford, Bristol, Cambridge, Cardiff, Chester, Derby, Leeds, Liverpool, Norwich, Nottingham, Oxford, Sheffield, Swansea plus locations in Devon and Cornwall.
4. By local London bus: Route 285 goes from the Heathrow Central bus station, by terminals 2 and 3 and route 490 goes from terminals 4 and 5 to Feltham station - which has trains to Ascot, Clapham Junction, Putney, Richmond, Weybridge and Windsor.

The RailAir buses don't use the Heathrow Central bus station, but they also don't serve Terminal 4: And the route to and from Watford Junction doesn't serve Terminal 5.
They stop directly outside:

• Terminal 2
• Terminal 3
• Terminal 5

to Bath, Bristol, Oxford, South Wales, Devon, Cornwall and The Cotswolds

The options are:

(1) Taking a Heathrow Express train to Paddington station to connect into an onward train; You can simply walk ahead on to the main concourse to await your onward departure.
Journey time = from 15 mins

(2)Take the Elizabeth line and on arrival at Paddington, you will need use two escalators or an elevator/lift to access the departure concourse.

When booking an end-2-end rail ticket ahead of the travel date, the ticket will cover the Heathrow Express.
However, if you haven't booked ahead, you'll save more than £10 by taking the Elizabeth line.
Journey time = from 26 mins

(3) Take a RailAir bus to Reading station.
Most trains from Paddington call in Reading around 25 mins after leaving London.
Journey time = around 45 mins from Terminal 5; 60mins from Terminal 2 and 65 mins from Terminal 3.

The journey time from Heathrow to Reading via Paddington is around 60 to 80 mins, So, in particular, the bus saves around 25 mins on a Terminal 5 to Reading transfer.

to Birmingham, Chester, Glasgow, North Wales, Liverpool, Manchester and The Lake District

The options are:

(1) By train to Euston station for onward trains to all of these destinations.
The easiest option is by taking the Elizabeth line to Tottenham Court Road and then connecting to the northbound Northern line of the Underground, by escalator or elevator.
Board towards the front of the Elizabeth line train and you'll be closer to the transfer at Tottenham Court Road.

Though the transfer from the Northern Line to the concourse at Euston station involves taking a short flight of stairs - But none of the alternatives are step-free.

Journey time = around 45 mins

(2) Take a RailAir bus to Watford Junction station.
Journey time = around 45 mins from Terminal 2; around 50 mins from Terminal 3.

Watford Junction has hourly trains operated by Avanti West Coast on to Coventry and Birmingham; Plus at around 15:50 on Monday to Friday there is a train which travels on to locations including Crewe, Preston, Lancaster, Penrith, Carlisle and Glasgow.
The Caledonian Sleeper service to Edinburgh and Glasgow typically departs from Watford Junction shortly after midnight on Monday to Friday (on Tues to Saturday mornings) and at 23:45 on Sunday.

Onward connections are available at Birmingham International into trains on to Chester, Manchester and both Mid and North Wales.

Connect at Birmingham New Street for a swathe of destinations including Liverpool, Lancaster, Oxenholme, Penrith, Derby, Leeds, Nottingham and Sheffield.
Which is why Conductor Sam often suggests the transfer at Watford Junction when asking about journeys from north-west England to Heathrow.

to Leeds, York, Newcastle, Edinburgh and beyond to other locations in Scotland

The trains on to these locations depart from King's Cross station, which is across the street from St Pancras International.

Hence the info above for making the Heathrow to Eurostar connection also applies to making the transfer between Heathrow and onward train from King's Cross.

Though to access the concourse at King's Cross instead of Eurostar departures:

• from the Thameslink station, turn left from from the exit, then cross the street when you leave the station
• from the Piccadilly line, do follow the signs pointing the way 'to the Trains'.

Though when booking rail tickets ahead for an end-to-end journey from Heathrow, you will be typically be routed through Paddington, with the journey by Underground on to King's Cross not covered by the ticket.
So the better option can be booking the rail ticket on from King's Cross and then using Pay and Go, by tapping the ticket gates, to get to King's Cross from Heathrow.

to Brighton, Cambridge, Gatwick Airport, Greenwich, Rochester and Peterborough

Take the Elizabeth line to Farringdon to connect into a Thameslink train - Board towards the rear of the Elizabeth line train and you'll be closer to the transfer at Farringdon.

Take the lift / elevator to platform 3 if you will be going to Brighton, Gatwick Airport, Greenwich or Rochester.
Connect in East Croydon or Gatwick for other locations in Sussex including Chichester, Eastbourne, Lewes and Worthing.

Take the escalator to platform 4 if you will be going to Bedford, Cambridge, Luton Airport or Peterborough.

to Colchester, Norwich, Ipswich and locations in Essex, Norfolk and Suffolk

Take the Elizabeth line to Liverpool Street as a step-free route is available to the departure concourse; plus you can board your onward train at the station at which it will be commencing its journey.
Board towards the front of the Elizabeth line train and you'll be closer to the transfer at Liverpool Street.

to Bournemouth, Salisbury, Southampton, Winchester and Weymouth

The options are:

(1) Take the Elizabeth line to Bond Street; Board towards the rear of train and you will be closer to the transfer to an eastbound Jubilee train on to Waterloo - the train will be heading to North Greenwich or Stratford.
Go this way and the route will be step-free.
Journey time = around 50 mins

(2)  Take a RailAir bus to Woking station.
Journey time = Around 30 mins from Terminal 5; Around 45 mins from Terminal 2; Around 50 mins from Terminal 3.

The trains depart from Woking around 25 to 30 mins after they leave Waterloo - So taking the bus typically saves around 25 to 45 mins compared to travelling through Waterloo and it will be cheaper too!

to Portsmouth

The options are the same as the journeys above to Bournemouth etc, except that the RailAir bus transfer is at Guilford station, so its journey times are 30 mins longer.

Booking the rail tickets

In the labyrinth of how British rail tickets can be purchased and used the three things most worth knowing are:

(1) By far the most expensive option is to book tickets when you get to the station that the long-distance onward train is departing from.
The temptation of this is that you won't have to factor in the time variables between flight and train, which can impact how the Advance tickets can be used - see below.
Though rather than booking on the next train that will be leaving, you can ask for the first later departure on which Advance tickets are available.

(2) You can save money by booking Advance tickets online, but you will need to select a specific departure when booking and then your ticket will only be valid if you make this departure.
So you'll need to consider the time between flight arrival and train departure - But the time needed to pass through Heathrow flight arrivals can vary by more than two hours.
So to err on the side of caution, you'll need to add at least two hours to the transfer time for the onward train + another 30mins for delay contingency.

If need be you can exchange your ticket to a later departure and pay a difference in price / and or an admin fee - but you can only do this before your booked train departs.
So if your flight is delayed, but you arrive at Heathrow before your train will be leaving, you can go online and try to make an exchange.

(3) On most routes the Advance tickets are now taken off sale around 10 mins to an hour pre-departure.
So an option is to find a quiet spot and log on to the airport wifi after you have exited arrivals to make a ticket booking.
You won't save as much if you had booked ahead, but it will typically be much cheaper than waiting until you are at the station, to book on to the next train to leave.