On or along the way: We are en route to the museum. The store is en route. (adverb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "en route" in a sentence
"Fumbling in the pitch black of their Idaho hotel room, where they had stopped en route to their final destination, Jan switched on the bedside lamp and stood for a moment in the circle of reassuring yellow light."
"Vidalin, which we carrried in our car en route to Seattle."
"For coded movement reports of Japanese warships en route to Hitokappu Bay in November 1941, see the SRN documents in RG 457, MMRB, Archives II."