Oh wow, looks really interesting! Great job! Out of curiosity, where do you get the data from ?

Some feedback:

* it'd be practical to be able to set an end date

* considering the type of visitor, a small link to Wikitravel/Wikivoyage or something could be useful to help decide

* i think that if you use referral links to flight and hotel booking platforms, at least some would use them ( i know i would) and that way help with dev/maintenance/hosting costs