Tuesday flights are found to be more expensive to fly from Idaho Falls to St. Louis. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to St. Louis.
Unlike in the morning, when flights are generally more expensive, you can save up to 45% on flights from Idaho Falls to St. Louis by exploring options for tickets at noon.
Our data shows that September tends to be the cheapest month to fly to St. Louis from Idaho Falls. Users have commonly found prices around $456 for the month, but tickets can be as low as $184. Due to multiple factors, prepare for potentially higher prices in May.