Airports near Trier
Hahn (also called “Frankfurt-Hahn”), 65 km (40 mi) east of Trier
http://www.hahn-airport.de/default.aspx
served by Ryanair, LTU, WIZZ, and Iceland Air
many inexpensive flights from Italy (e.g., Bolzano, Genova, Milano, Pescara, Pisa, Rome, Venice),
France e.g., Biarritz, Marseilles, Montpellier), London, Budapest etc.
Luxembourg, 47 km (29 mi) west of Trier
http://www.luxairport.lu/fr/
Frankfurt, 180 km (112 mi) east of Trier
http://www.airportcity-frankfurt.com/
many flights from everywhere, on the way to the Mosel you can visit the Rhine river and the Rheingau.