The cheapest flight to London you can get by boooking 19 days before departure.
The most popular airlines on the route Cologne - London: Ryanair (FR), Germanwings (4U), Flybe (BE).
The cheapest flights you can book on the route Cologne - Bonn Airport (CGN) - Southend (SEN).
Direct flights last about 1h 10min.
Direct flights available 7 days a week.
Direct flights: Ryanair (FR), Germanwings (4U), Flybe (BE).