For the cheapest flights to Bologna book 6 days before departure.
The most popular airlines on the route Cologne - Bologna: Germanwings (4U), Pegasus (PC), Lufthansa (LH).
The cheapest flights are on the route Cologne - Bonn Airport (CGN) - Guglielmo Marconi (BLQ).
Direct flights last about 1h 25min.
Direct flights available 4 days a week - Monday, Tuesday, Friday, Sunday.
Direct flights: Germanwings (4U), Eurowings (EW).