Within 25 minutes by public transport from Zurich Airport:

Line 10 - direction Hauptbahnhof: exit the tram at 'Milchbuck' or at 'Universität Irchel'.

Within 15 minutes by public transport from Zurich Main Station:

Line 10 - direction Zürich Flughafen: exit the tram at 'Universität Irchel'
Line 14 - direction Seebach: exit the tram at 'Milchbuck'
Line 7 - direction Bahnhof Stettbach: exit the tram at 'Michbuck'.

Public transport Zurich: ZVV

By car: Routeplanner Campus Irchel

A large underground parking called 'Irchel' is directly accessible from the freeway A1. 

By taxi/cab:

Destination taxi stand of the University of Zurich Irchel (from Zurich Airport ~CHF 40).

Campus Irchel: Finding your way

The numbering scheme for buildings and rooms is as follows: 
Y11 G 23
Y = Irchel Campus
11 = building number
G = floor
23 = room number

Access from one building to another is via Floor G.

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Find Schmelzbergstrasse 26 on the map.

Within 40 minutes by public transport from Zurich Airport:

Line 10 - direction Hauptbahnhof: exit the tram at 'Haldenbach' or 'ETH/Universitätsspital'.

Within 15 minutes by public transport from Zurich Main Station:

Line 10 - direction Zürich Flughafen: exit the tram at 'ETH/Universitätsspital'
Line 6 - direction Zürich Zoo: exit the tram at 'ETH/Universitätsspital'

Public transport Zurich: ZVV.