The calculated distance (air line) between Koshigaya and Yotsukaidō is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Yotsukaidō is certainly longer, as only the direct route (as the crow flies) between Koshigaya and Yotsukaidō has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles