Manchester is one of a number of European airports where the Gulf carrier is poised to add capacity for 2025.
Like Manchester, Paris will gain a second daily Abu Dhabi flight in January.
It means by next July, Etihad will fly twice a day to Barcelona, Frankfurt, Madrid, Manchester, Milan, Munich, Paris, Rome and Zurich from Abu Dhabi.
Dublin is also gaining additional flights, with Etihad set to go up from seven services a week to 10, starting next July.
The new flights are open for booking now. Etihad said they would be timed for convenient morning and evening departures and arrivals.
