The carrier blamed the government for refusing to suspend or reduce APD (Air Passenger Duty], and the lack of Covid recovery incentives from both Belfast airports
The airline said the planes based at those airports will be reallocated to lower-cost airports elsewhere in the UK and Europe for the winter schedule, which starts in November.
Ryanair will stop its flights from Belfast international to six destinations – Alicante, Málaga, Kraków, Gdansk, Warsaw, and Milan – by 30 October.
And it will withdraw eight services from City airport – to Alicante, Barcelona, Faro, Ibiza, Mallorca, Málaga, Milan, and Valencia – on 12 September.
The decision comes at a challenging time for the airline industry.