Place the sliced cucumbers in a colander and sprinkle with 1 teaspoon of salt. Let sit for 10 minutes to draw out excess moisture, then pat dry with paper towels.
In a medium bowl, whisk together Greek yogurt, apple cider vinegar, honey, Dijon mustard, remaining salt, and black pepper until smooth.
Add the drained cucumbers, red onion, chopped dill, and olive oil to the yogurt mixture. Gently toss to combine.
Cover and refrigerate for at least 30 minutes before serving to allow flavors to meld.
Notes
For best results, use English cucumbers and serve chilled.