The calculated distance (air line) between Saarbrücken and Saarwellingen is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Saarwellingen is certainly longer, as only the direct route (as the crow flies) between Saarbrücken and Saarwellingen has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles