en route /ˌɒn ˈruːt $ ˌɑːn-/ BrE AmE adverb
[ Date: 1700-1800 ; Language: French ; Origin: 'on the way' ]
on the way
en route from/to
a flight en route from Tokyo to Sydney
en route for British English :
We stayed there en route for London.
Why don’t we stop for lunch en route?