Sunday flights are generally found to be more expensive for flights 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.
To save up to 96% on this flight, we recommend booking at least 31 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Idaho Falls to St Louis from $374 1-2 weeks out and tickets from $553 for flights departing within the next 72 hours.
Our data shows that August tends to be the cheapest month to fly to St Louis from Idaho Falls. Users have commonly found prices around $266 for the month, but tickets can be as low as $158. Due to multiple factors, prepare for potentially higher prices in December.
Unlike in the morning, when flights are generally more expensive, you can save up to 8% on flights from Idaho Falls to St Louis by exploring options for tickets at noon.