SAS offers cheap flights from Germany to Svalbard (Spitsbergen). Tickets from Düsseldorf to Longyearbyen for only 261 EUR round trip.
Sample travel dates:
Düsseldorf (DUS) – Longyearbyen (LYR) – Düsseldorf (DUS).
Baggage during the trip:
One cabin bag and one checked baggage per passenger.
Cheap accomodation on Longearbyen Camping (information and rates).