No, but as with all domestic flights, the airline will want some proof of ID;
Acceptable form of non-photographic ID:
does my passport need to be in date to go to belfast
No
No, Belfast is in Northern Ireland which is part of the UK - you don't need a passport to travel from one part of the country to another.
No
No but you do need I.D.
Yes
No, you shoudn't because it is part of the United Kingdom.
No but you will need photographic identity. Check wit the ferry company.
NO
Yes - you will need to show it on arrival in Prague and to leave Northern Ireland.
You will certainly need a passport - since Ireland is off the UK mainland.
A passport money for ticktes and a plane would help.