In a large bowl, whisk together honey, lime juice, soy sauce, olive oil, minced garlic, cumin, salt, black pepper, and red pepper flakes until well combined.
Add the chicken thighs to the marinade, ensuring they are fully coated. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or up to 4 hours for more flavor.
Preheat your grill or a grill pan over medium-high heat.
Remove the chicken from the marinade, letting any excess drip off. Discard the remaining marinade.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F and the chicken is nicely charred.
Remove the chicken from the grill and let it rest for 5 minutes before slicing.
Garnish with chopped cilantro if desired and serve with lime wedges.