All European capitals and many other cities have direct connections with Schiphol airport. The airport has regular direct train connections with Enschede (2 hours, €25).
For European flights from Copenhagen, Vienna or Munich: The airports of Münster and Osnabrück are also close-by and have good train connections to Enschede. Check their website to travel to and from this airport: https://www.fmo.de/en/service/arrival-departure/
There are also good train connections with Belgium and Germany (direct trains to Hannover and Berlin). Plan your trainride here: https://www.ns.nl/en
For planning your travel with public transport use: https://9292.nl/en
For specific route description to our campus: https://www.utwente.nl/en/contact/route/