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 Decatur 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 Decatur. 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.
When flying from Decatur to St Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.