Ryanair will trial a reserved seating service on its Dublin-Malaga and Dublin-Gatwick routes from 16 May.
The pre-booked service costs €10 ($14.3) each way, including priority boarding. It allows passengers to pre-reserve seats in the front two rows, or in over-wing rows (16 and 17) says Ryanair.
Ryanair says it will continue to provide its priority boarding service for €4.
The company says if the trial proves successful it will be rolled out "selectively on other Ryanair routes in the coming months".