Preheat your oven to 400°F. Toss the halved cherry tomatoes with olive oil and a pinch of salt.
Spread them on a baking sheet in a single layer. Roast for 10–15 minutes until the tomatoes are soft and slightly caramelized. Set aside to cool slightly.
In a large bowl, add the spiralized zucchini noodles. Drizzle with the cilantro pesto and sprinkle the red pepper flakes over the noodles.
Add the cherry tomatoes, then toss gently to combine and evenly coat the noodles with the pesto and spices.