The airline will increase frequency on the route from three-times daily to five-times daily at its peak.
Between 26 May and 22 June, the service will increase to four-times daily.
Etihad will then add a fifth daily flight between 23 June and 28 September.
This will revert to four-times daily between 29 September and 26 October before returning to three-times daily.
The additional flights will be operated by a Boeing 787-9 Dreamliner aircraft featuring 271 economy seats and 28 business.
Etihad’s usual three-times daily Abu Dhabi-Heathrow service will continue to be operated by Airbus A380 aircraft.
