Fourteen short-haul flights were cancelled
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British Airways had to cancel flights to Europe from Heathrow's Terminal 4 after a power failure meant planes could not be refuelled.
Fourteen return short-haul flights were cancelled and other airlines were hit when a "power outage" affected the ability to refuel aircraft, BA said.
Flights leaving from terminals 1, 2 and 3 were not affected by the problem, which was rectified on Friday night.
BA apologised to travellers and said flights returned to normal by 1930 BST.
A spokesman said: "We apologise to customers for the disruption to their travel arrangements."
Planes leaving Heathrow were affected as well as flights returning from Zurich, Copenhagen, Lyon, Amsterdam, Paris Charles de Gaulle, Brussels, Oslo, Geneva and Basle.