We just put together an app that helps you with that!
Just draw around your area of interest, wait for a few seconds, and see all the species that had been reported there and when it is more probable that they’ll be flying there!
You can find this app in the Science section of our discussion forum here: https://forum.e-butterfly.org/t/what-is-flying-around/220.
Or sign up to the forum here: https://bit.ly/3RuDxJG
Note: this app is experimental and eButterfly is not responsible for its performance, accuracy or maintenance