The calculated distance (air line) between Newbiggin-by-the-Sea and Birkenhead is approximately 138 miles respectively 222 kilometers.
By car or train, the actual journey to Birkenhead is certainly longer, as only the direct route (as the crow flies) between Newbiggin-by-the-Sea and Birkenhead has been calculated here.
Air line (approximately)
222 kilometers
120 nautical miles