Slice cucumbers thinly using a knife or mandoline.
Place cucumber slices in a colander and toss with salt. Let sit for 10 minutes to draw out moisture.
While cucumbers rest, whisk together rice vinegar, soy sauce, sesame oil, honey, minced garlic, and chili flakes in a small bowl.
Rinse salted cucumbers under cold water and pat completely dry with paper towels.
Transfer dried cucumbers to a mixing bowl. Pour dressing over and toss to coat evenly.
Add toasted sesame seeds and chopped cilantro. Gently mix everything together.
Let salad sit for 5 minutes before serving to allow flavors to combine.