Question : What are the chances this flight will be delayed?
Answer : The Louisville to Saint Louis route has a 50% on-time rate, ranking in the bottom 50% of the world in getting their passengers to their destinations on schedule. If a flight is late, expect an average of about half an hour added to your flight time.
Question : What's the likelihood of you being delayed on this route?
Answer : SDF to SUS currently scores 2 out of a possible 5 stars in promptness. This score combines both the number of delayed flights and total delay minutes. With 2 stars, you should feel rather worried about getting to Saint Louis on time.