In a large mixing bowl, combine the diced cucumbers and salt. Let them sit for about 10 minutes to draw out excess moisture, then drain any liquid.
In a separate bowl, whisk together the Greek yogurt, olive oil, lemon juice, minced garlic, dill, black pepper, and red pepper flakes (if using) until smooth.
Add the drained cucumbers to the yogurt mixture and stir gently to combine, ensuring the cucumbers are well coated.
Taste and adjust seasoning if necessary. Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Serve the salad in individual bowls or on a platter, garnished with halved cherry tomatoes.