The LZ 127 polar flight (1931)

The Graf Zeppelin made another groundbreaking flight in July 1931 with a research trip to the Arctic (Polarfahrt 1931).

A year before the Graf flew on a three-day trip to Norway and Spitsbergen in July 1930 in order to determine its performance in this region. This was followed shortly thereafter by a three-day flight to Iceland. Both trips were completed without technical problems. The polar flight took one week from July 24–31, 1931. The Graf Zeppelin traveled about 10,600 km (6,600 mi) with the longest leg without refueling being 8,600 km (5,345 miles). The average speed was 88 km/h (55 mph).

Route:
Friedrichshafen–Berlin – 600 km (370 mi) in 8 hours (75 km/h; 47 mph)
Berlin–Leningrad – 1,400 km (870 mi) in 16 hours (87 km/h; 54 mph)
Leningrad–Kanin – 1,300 km (810 mi) in 12 hours (108 km/h; 67 mph)
Kanin–Franz-Joseph-Land – 1,200 km (750 mi) in 18 hours (67 km/h; 42 mph)
Franz-Joseph-Land–Nordland–Taimyr–Novaya Zemlya – 2,400 km (1,500 mi) in 32 hours (75 km/h; 47 mph)
Novaya Zemlya–Leningrad – 2,300 km (1,400 mi) in 25 hours (92 km/h; 57 mph)
Leningrad–Berlin – 1,400 km (870 mi) in 13 hours (108 km/h; 67 mph)
Berlin–Friedrichshafen – 600 km (370 mi) in 8 hours (75 km/h; 47 mph)

Source: Wikipedia