For one traveler the Piccadilly line is cheaper by £20.10. That does not change up to 8 travelers.
The Heathrow Express is quicker: 15 min against 50 min.
Piccadilly line: 05:00–23:30. Heathrow Express: hours not recorded.
Priced against each other
Whole-party totals · adult fares
What each costs for the whole party, in GBP. The cheaper of the two is marked on every row.
Travelers
Piccadilly line
Heathrow Express
Difference
1
£5.90
£26
£20.10
2
£11.80
£52
£40.20
3
£17.70
£78
£60.30
4
£23.60
£104
£80.40
5
£29.50
£130
£100.50
6
£35.40
£156
£120.60
7
£41.30
£182
£140.70
8
£47.20
£208
£160.80
Side by side
Where each one leaves you
Piccadilly · Transport for LondonPiccadilly line
From
Underground stations at Terminals 2 & 3, Terminal 4 and Terminal 5
To
Every Zone 1 station without a change, including Piccadilly Circus and King's Cross
Luggage
No stated limit, but it is a tube train and the Piccadilly line has no racks.
Runs
05:00–23:30
Journey
50 min
It is the slowest of the three trains at about 50 minutes, and it stops everywhere. What it buys is £20.10 kept and a fare that counts towards your daily cap.
There is no off-peak fare on this journey. Landing at a quiet hour saves you nothing, which is not true of any other Zone 6 station.
The Night Tube runs on Friday and Saturday nights only, and not to Terminal 4.
Terminals 2 & 3 and Terminal 5; Terminal 4 by a free four-minute transfer train
To
London Paddington, and nowhere else
Luggage
Racks throughout; it is built as an airport train.
Journey
15–21 min
£26.00 against £5.90 on the Underground is 4.4 times the fare to save about 35 minutes — roughly £34 an hour, before you count what the cap would have saved you.
It does not count towards the daily cap. TfL states that Heathrow Express journeys "are not included in caps and Travelcards", so a same-day return is £52.00 and caps at nothing.
It goes to Paddington and nowhere else. If Paddington is not your destination, add a further journey and its fare to everything above.
Terminal 5 adds five or six minutes to the quoted fifteen — the operator says six, the airport says five.
The first departure from the airport is not stated here: the operator publishes the first train from Paddington at 04:34 Monday to Saturday and the last from Terminal 5 at 23:57, but does not publish a first departure from the airport itself.
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