It takes nearly 12hrs to fly from London Heathrow to Mauritius
Southbound over Southern Europe, over the Sahara desert, the rain forests and grasslands of East Africa then down towards Mauritius.
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8hr 25min Muscat (MCT) to London Heathrow (LHR) by a nonstop flight operated by Oman Air.
Flights from Heathrow to Bangkok can fly as far north as Siberia on the way and they can also fly as far south as the Alps in Europe.
A flight from Heathrow to Helsinki would fly northeast out of London and head over Norfolk and then it will spend some time over the North Sea, then the flight would cross the middle of Denmark the over Southern Sweden before reaching Finland.
Direct GPS from EGLL (London Heathrow) to CYTZ (Toronto Center City) - Initial heading 299 (West - Across Atlantic Ocean - Across Nova Scotia - Into Toronto) Flight time at 500 kts - 6 hours
A flight from Heathrow to Miami will fly southwest out of London and then fly towards Devon and Cornwall before leaving UK airspace, then the flight will fly over much of the Atlantic before reaching Florida.
Out from heathrow turning south over the english channel over france coming over marsaille... then over baleric islands area algeria mali and into nigeria
10hr 05min London Gatwick (LGW) to Male (MLE) by a nonstop flight operated by British Airways (Flt 2043 on Tue,Fri).10hr 20min London Heathrow (LHR) to Male (MLE) by a nonstop flight operated by Srilankan Airlines (Flt 510 on Mon,Thu).
Using this as an example; The flight path from Vancouver to London (using London Heathrow Airport) would ypically travel northeast over Canada, then over the tip of Greenland, then down towards Northern Ireland, then across to Liverpool and finally south-east towards Birmingham and Oxford before approaching London.
Most long distance flights try to keep close to a Great Circle route (to save fuel). Stretch a string or thread tightly on the surface of a globe and have it go through London and NYC and you have a great circle route. the path goes pretty fr north and follows the Canadian and New England coast before arriving at JFK.
The flight path follows a Northeast direction.