Ryanair carried 17.4 million passengers across its route network last month, latest figures from the airline show.
The September passenger figures represent a 9% increase on the same month last year.
In all, Ryanair operated more than 97,350 flights during September, with load factor – which measures how full planes are – consistent at 94%.
On a rolling 12-month basis, from September 2022, Ryanair carried almost 179 million passengers – marking a 17% annual increase.