Although it’s a bit beyond our site’s purpose, there are a few words to be said about the Piccadilly line going to Heathrow, because it could be confusing.
Trains heading west from central London on the Piccadilly line split at Acton Town. Make sure you are not going on the trains that head north towards Uxbridge. Check on the indicators, on the front of the train and station announcements that it’s a Heathrow train.
The line also splits after Hatton Cross. You will need to know which airline you are travelling on and which terminal they are using for that flight. This is especially complicated if it’s a code share. There are posters on the trains showing which terminal you need, but don’t believe them alone. Check your actual flight on the day.
Also be aware that there is no wireless on the train, only at stations. Some parts of this route are above ground, so your phone may get a signal, but not all of the route, so don’t leave it to the last minute.
Some trains from Hatton Cross go to Terminals 2 and 3, then on to Terminal 5. The signs will say “Terminals 2 and 3 and Terminal 5”.
Other trains go to Terminal 4 first, then turn back, apparently heading towards London, before stopping at Terminals 2 and 3. The signs will say “Terminal 4 and Terminals 2 and 3”.
There is no Terminal 1 any more.
You can see from the map extract that there’s a kind of one-way loop that takes your round the houses, well, the airport a bit. It’s often called the “T4 loop”. Don’t be confused that the train seems to be going back the way you came.
If you are going to T2 or T3 you can take any train. Our experience is that T5 trains are quicker but less frequent, but it depends.
If you are going to T4 you have no choice.
If you are going to T5 you have no choice.
If your required train is not shown you can go as far as Hatton Cross and then change. It won’t be any faster, but it will at least get you close.
Use the extra large spaces on the train for any suitcase or big bag you may have, but keep an eye on it. Make sure you have a valid ticket or payment method. Make sure you allow plenty of time in case of delays.