Django is much larger with its ORM, template system, admin site, and so on.
Feature-wise it seems close to Flask. I suspect that Flask is more opinionated than Falcon: it requires the Jinja2 template library and your project may end up with a tight coupling with Flask if you use its blueprint system or don't think through how you use Flask's context variables flask.request and flask.g (Flask tries to be too clever here IMO).
Falcon looks more like a library than a framework to me and its design seems less likely to affect how you structure projects compared to Django in particular but also Flask.
Feature-wise it seems close to Flask. I suspect that Flask is more opinionated than Falcon: it requires the Jinja2 template library and your project may end up with a tight coupling with Flask if you use its blueprint system or don't think through how you use Flask's context variables flask.request and flask.g (Flask tries to be too clever here IMO).
Falcon looks more like a library than a framework to me and its design seems less likely to affect how you structure projects compared to Django in particular but also Flask.