not that long...
About 20 minutes.
Heathrow Airport is situated at the Western extent of the Piccadilly line. Passengers for Terminals 1, 2 & 3 should alight at the Central Station, which is announced and displayed as 'Terminals 1,2,3'. Trains currently serve the airport via direct services to the Central Station before carrying on to the station at Terminal 5, or by diverting to the station at Terminal 4 by way of a loop prior to calling at the Central Station. Regular crew-made and automated announcements remind passengers to observe which train they are on as the Terminal 4 trains may hold at Terminal 4 for 8 mins prior to returning to the Central Station.
About 20 miles
It depends on how many flights are landing around the time of your own flight.
From Chicago to Heathrow it takes about 7 hours and 50 minutes of flying time
No.
45 minutes on the Piccadilly line
25 miles taking this route:Follow A3 towards LONDON from Guildford to M25. Once you are at M25, follow signs to M25 (W) to HEATHROW.Take M25 around London on the LONDON ORBITAL to HEATHROW. FOLLOW SIGNS to your TERMINAL.
Between Terminals 1, 2 and 3Heathrow Terminals 1, 2 and 3 are close together at the centre of the airport and linked by a pedestrian underpass with moving walkways. Just follow the signs for your terminal.Approximate walking times between terminals are:Terminal 1 - Terminal 2: Seven minutes.Terminal 1 - Terminal 3: 11 minutes.Terminal 2 - Terminal 3: 10 minutes.
Atlantic Terminal in downtown Brooklyn. The Atlantic Terminal on the corner of Flatbush and Atlantic connects the Long Island Railroad (LIRR) with most of the Brooklyn and Manahattan subway lines. Grand Central and Penn Station in Manhattan have more tourists, but Atlantic Terminal in Brooklyn has more locals.
As there are no direct trains from Heathrow to London Waterloo, it's quicker to travel by underground from Heathrow on the Piccadilly Line to Leicester Square Underground Station and then change onto the Northern Line to London Waterloo Railway Station.
You can't use a boat from Heathrow. It's an AIRport.