Hello lauratravelunrivaled
Zurich mainstation is named ‘Zürich HB’.
Single journey tickets are not valid 24 hours. You would need to purchase a return journey.
Simply purchase a return journey ticket Zürich Flughafen to Zürich HB, which is automatically converted into a day pass.
Online tickets need the name / date of birth of the person travelling. The person must carry their physical passport or ID.
Kind regards,
Roland
