it depends what jet.
Jet airliners travel at about 500mph
A typical Jumbo Jet will fly at 550-600 mph top speed.
This depends on the type of jet.
The SR-71 is the fastest manned jet. Its fastest recored speed is Mach 3.3 (3.3 the speed of sound.)
It depends on the model of the Royal Air Force fighting jet that you are asking about. But the Eurofighter Typhoon jet, has a top speed of 1,320mph.
The crusing speed of the concord jet is Mach 2, or 1,336 mph (2,150 kph).
Airspeed
Flying with the jet stream, the plane's speed is its own speed plus the jet stream speed, totaling 80mph more than its usual speed. So, when it travels for 5 hours, it covers 5 hours x (its speed + 80mph). After leaving the jet stream, it flies at its own speed, without the jet stream speed. For the next 4 hours, it covers 4 hours x its speed. The total distance traveled during the entire trip is the sum of these two distances.
A fighter jet can be faster than the speed of sound.
Mach 3.7
280kmph.
It is 1,550mph