Etihad Airways said it had cancelled the following flights: EY21, Abu Dhabi to Manchester; EY22, Manchester to Abu Dhabi; EY17, Abu Dhabi to Heathrow, due to depart at 9.30am local time; EY18, Heathrow to Abu Dhabi; and EY20, Heathrow to Abu Dhabi.
Heavy smoke from a volcano that has erupted in Iceland is to blame.
Emirates have cancelled London Heathrow (EK29/030, EK03/04 and EK05/06), London Gatwick (EK09/10), Manchester (EK17/18 and EK19/20), Newcastle (EK35/36), Birmingham (EK39/40 and EK37/38), Glasgow (EK27/28)