The best way to find a cheap bus ticket from Cologne Bonn Airport to London is to book your journey as far in advance as possible and to avoid traveling at rush hour.
This is the last bus of the day.
Find all the dates and times for this journey
12 h 35 m
15 h 1 m
Buses per day
Of the 6 buses that leave Cologne Bonn Airport for London every day 6 travel direct so it’s quite easy to avoid journeys where you’ll have to change along the way.
Here are some other resources that might have the information you need