The calculated distance (air line) between Pruszcz Gdański and Bydgoszcz is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Pruszcz Gdański and Bydgoszcz has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles