In a large mixing bowl, combine the diced cantaloupe, diced cucumber, and finely chopped red onion.
Add the chopped mint leaves and crumbled feta cheese (if using) to the bowl.
In a small bowl, whisk together the olive oil, lime juice, honey (if using), salt, and pepper until well combined.
Pour the dressing over the salad mixture and gently toss to combine all ingredients evenly.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Serve chilled and enjoy!