score:8
No.
All Ryanair flights are changeable but they cannot be cancelled.
The policy you are probably thinking about is mainly a US requirement that flights to and within the US are freely cancelable for a 24 hour period after purchase. This does not, obviously, include Ryanair.
Upvote:-2
Yes you can - but Ryanair doesn't like you doing it so you have to call them. There is no means to electronically do this.