Latvia is becoming easier and cheaper by plane. There are now daily flights directly from the airport to Riga with AirBaltic and KLM. Most and least expensive flights to Riga with Ryanair. You departs from the airport in Dusseldorf (Weeze).
Information about flights and reservations can be obtained from a travel agency or via:
At the airport of Riga you can then rent a car for your journey again.