If you want a cheap flight from Manchester to Berlin, you've got zero airlines to choose from.
Berlin-tegel / Otto Lilienthal Airport is just one of the airports in Berlin. If you're not set on a specific airport, try changing your search from Berlin-tegel / Otto Lilienthal Airport to Berlin to see a broader range of flights – they might be cheaper.
The cheapest month of the year to fly to Berlin is January.
July tends to be the most expensive time of the year to fly to Berlin. During this peak season, accommodation prices often increase too, so it's best to book early. Or you could keep your fingers crossed and hold out for a last-minute deal.