A flight from Glasgow to Denver takes at least 12 hours 45 minutes. As there are no direct flights, you will have to change flights, either at London Heathrow or in the eastern US (Newark or Philadelphia).
The 12 hours 45 minutes time is based on British Airways with a 1 hour 40 minute layover at Heathrow.
it's a long way
About six hours
About 24 hours
About 3 hours
About five hours
about 6hrs
3 hours
Around 3 hours.
About 24 hours
around 7 hours
It will take 2 hours 45 minutes.
It will take about 3 hours and 30 minutes.