For the cheapest flights to Barcelona El Prat book 5 days before departure.
The most popular airlines on the route Cologne - Bonn Airport - Barcelona El Prat: Ryanair (FR), Germanwings (4U), Lufthansa (LH).
Direct flights last about 2h 5min.
Direct flights are available 7 days a week.
Direct flights: Ryanair (FR), Germanwings (4U).