If you compare transportation prices, the taxi ride in London costs an average of 4.50 GBP, 8% more expensive than Cologne, with a fare of 4.17 GBP,
while train tickets costs 9% more in London: 2.90 GBP against 2.67 GBP in Cologne.
If you compare the price of a lunch meal, however, you can find it from 20.00 GBP in London, 71% more than the 11.67 GBP in Cologne.
The price of the coffee is around 23% more expensive in London, with an average of 3.75 GBP , while in Cologne the coffee costs 3.05 GBP.
The main airport route flying between Cologne and London is: Koeln - Bonn (CGN) to Heathrow (LHR). This route is covered by the following airline(s):
Eurowings.
British Airways.
Alternatively, you can find Cologne - London flights between Koeln - Bonn (CGN) to Stansted (STN) with the following airline(s) flying the route: Ryanair.
Ryanair UK.
Airlines with direct flights departing from Cologne to London are:
Eurowings, stopping in Hamburg for 65 minutes minimum.