If you compare transportation prices, the taxi ride in London costs an average of 4.00 GBP, 4% cheaper than Cologne-Bonn, with a fare of 4.17 GBP,
while train tickets costs 3% more in London: 2.90 GBP against 2.81 GBP in Cologne-Bonn.
If you compare the price of a lunch meal, however, you can find it from 20.00 GBP in London, 68% more than the 11.92 GBP in Cologne-Bonn.
The price of the coffee is around 19% more expensive in London, with an average of 3.82 GBP , while in Cologne-Bonn the coffee costs 3.21 GBP.
The main airport route flying between Cologne-Bonn and London is: Koeln - Bonn (CGN) to Heathrow (LHR). This route is covered by the following airline(s):
British Airways.
Eurowings.
Alternatively, you can find Cologne-Bonn - 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-Bonn to London are:
Eurowings, stopping in Hamburg for 65 minutes minimum.