The cheapest flight to Milan you can get by boooking 28 days before departure.
The most popular airlines on the route Cologne - Milan: Ryanair (FR), Germanwings (4U), Air Berlin (AB).
The cheapest flights you can book on the route Cologne - Bonn Airport (CGN) - Bergamo Orio al Serio (BGY).
Direct flights last about 1h 20min.
Direct flights available 7 days a week.
Direct flights: Ryanair (FR), Germanwings (4U).