What is another word for on way?
Pronunciation: [ˌɒn wˈe͡ɪ] (IPA) 
The phrase "on way" means to be traveling or going towards a certain destination or goal. There are several synonyms for this phrase which can be used in different contexts. Some of the synonyms for "on way" are en route, making progress, in transit, moving forward, heading towards, underway, approaching, coming closer, and advancing. These words can be used interchangeably to convey the same meaning, but their connotation and suitability differ depending on the context. For instance, "underway" is a great synonym for "on way" when referring to a ship or a plane that's already moving, while "approaching" is a better choice when referring to someone who's almost getting to a particular place.
