Ryanair is to reschedule another 400,000 passengers booked on to 18,000 flights between November and March.
It will be flying 25 fewer aircraft in the hope of cut the risk of further flight cancellations.
Earlier this month the Irish airline cancelled up to 50 flights a day through to October after it admitted “messing up” pilot holiday rosters.
Ryanair said that by slowing the monthly growth rate from 9% down to 4% it will avoid roster problems.
The decision will mean schedule changes and Ryanair says it will offer affected passengers alternative flights or full refunds.