The calculated distance (air line) between Bratislava - Vajnory and Trenčín is approximately 61 miles respectively 98 kilometers.
By car or train, the actual journey to Trenčín is certainly longer, as only the direct route (as the crow flies) between Bratislava - Vajnory and Trenčín has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles