The calculated distance (air line) between Thornaby-on-Tees and Birkenhead is approximately 105 miles respectively 169 kilometers.
By car or train, the actual journey to Birkenhead is certainly longer, as only the direct route (as the crow flies) between Thornaby-on-Tees and Birkenhead has been calculated here.
Air line (approximately)
169 kilometers
91 nautical miles