The cheapest flight to Budapest you can get by boooking 25 days before departure.
The most popular airlines on the route Cologne - Budapest: Germanwings (4U), Air Berlin (AB), Lufthansa (LH).
The cheapest flights you can book on the route Cologne - Bonn Airport (CGN) - Liszt Ferenc (BUD).
Direct flights last about 1h 40min.
Direct flights available 7 days a week.
Direct flights: Germanwings (4U), Eurowings (EW).