The calculated distance (air line) between Guinea and Sierra Leone is approximately 175 miles respectively 282 kilometers.
By car or train, the actual journey to Sierra Leone is certainly longer, as only the direct route (as the crow flies) between Guinea and Sierra Leone has been calculated here.
The center of the country is used to calculate the distance. For a more precise determination of the distance, please use one (or better yet two) cities for the distance calculation.
Air line (approximately)
282 kilometers
152 nautical miles