The Icelandic volcanic ash cloud chaos cost easyJet £65 million as passenger numbers dropped by 8%.
EasyJet was forced to cancel 7,314 flights affecting almost one million passengers.
The budget carrier saw sales rise to almost £760 million in the three months to the end of June despite the April ash disruption.
It reported a 5.3% rise in third-quarter revenue and said it would report an annual pre-tax profit of £100-£150 million.
Former Guardian Media boss Carolyn McCall, who replaced Andy Harrison as the airline’s chief executive this month, said: “This was in spite of the challenges presented by significant disruption caused by volcanic ash and, more recently, the combination of air traffic control industrial action and crewing issues in some parts of our network.
“We have put a mitigation plan in place in response to these recent issues in order to minimise the future impact to our passengers and staff.”