From most locations, the cheapest flights to Cologne can be found during the month of January; however great deals can be found at other times.
Most flyers found that booking flight tickets 60 days in advance of their planned departure date is, on average, the best time to get cheap flights to Cologne.
In general, booking your departure to Cologne for a Wednesday represents the best deal on airfare. Try to avoid a Sunday departure to stay away from the highest prices.
Typically, cheap prices to Cologne are most often found for morning flights. Cheap prices are less likely for midday flights.