Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at Apr 12th. As of Mar 20th, it's showing the cheapest ticket sales at $1,345. That is 10% below the average price for this route, so you can spend that extra money on an adventure in Cologne.
Question : How much should a trip from Saint Louis (STL) to Cologne (CGN) cost?
Answer : Ranging from $876 to $1,966, prices for STL to CGN change less than the majority of routes from the United States. Prices tend to be lower the further out you book.
Question : How long do most people stay in Cologne?
Answer : Of course you're not most people, but if you were, you'd stay roughly one week.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : The best day to fly on a budget this month is Wednesday. Flexibility is paramount when booking travel plans in order to keep travel costs down.