"Favorable to" is a common phrase used to describe something that is advantageous, beneficial, or supportive towards an individual or an event. However, there are several synonyms that can be used interchangeably to convey the same or similar meaning. For instance, the phrase "conducive to" can be used to depict an environment or a situation that is ideal for the growth or progress of something. Similarly, "propitious" can be used to indicate a favorable start or a moment that presents great opportunities. "Advantageous," "positive," and "supportive" are other words that can be used to describe a favorable condition or situation. In conclusion, there are several synonyms that can effectively communicate the same idea and meaning as "favorable to".