When flying from Waterloo, Iowa 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.
American Airlines is one of the carriers that may have flexible change policies. You can use our site to filter for other airlines that may also have this kind of flexibility.
Looking at all options, your cheapest flight can be booked for $417. While the most popular route (Waterloo - Lambert-St Louis) can be booked for $738 on average our data indicates $426 when flying from Waterloo, Iowa to St. Louis.