It depends (among other things) on where your coming from, what modes of transport you use (airplane, Tube/train), which route you select (direct, indirect), whether there is traffic congestion or unforeseen obstacles, and whether you mean the City of London, the general vicinity, one of the major airports/train stations, or some other definition you may have in mind. You have to be a little bit more specific. It could take days, hours, or just a few minutes.
About two to three hours
A direct flight from London, England to Amarillo, Texas will take about 10 hours.
The distance from London, England to Cornwall, England is 269 miles and takes approximately 4 hours and 45 minutes.
There are no trains from Minnesota to London, England. Train travel is not possible across the Atlantic ocean.
London-Prague is about 1hr 40mins.
It's about a four hour drive.
About 2 hours.
4 hours
It takes about 3 h 50 min to drive from York to London. The trip is 215 miles.
The flight would be 21 hours long.
A flight will take about 6 hours and 50 minutes.
It takes 13 hours and 59 minutes to fly from London, England, to Singapore. This is adding in an extra 30 minutes for take off and landing.