I live near Phoenix, AZ and find these beautiful butterflies on my Lantana flowers in my yard often.
I am pretty sure it is a Monarch. I am not a pro, so please forgive me if I am wrong. My 5-year-old son ran inside to tell me about this one. So I had 3 kids and had to take the picture while holding my baby.
The picture isn't the best, but the kids really enjoyed watching the butterflies dance around. The butterflies were hard to keep track of because they were a bit camouflaged in these orange flowers. I did snap this photo though.