The cheapest flight to Madrid you can get by boooking 28 days before departure.
The most popular airlines on the route Cologne - Madrid: Ryanair (FR), Pegasus (PC), Germanwings (4U).
The cheapest flights you can book on the route Cologne - Bonn Airport (CGN) - Barajas (MAD).
Direct flights last about 2h 40min.
Direct flights available 3 days a week - Monday, Wednesday, Sunday.
Direct flights: Ryanair (FR).