Northern Ireland is part of the UK. A citizen would not necessarily need a passport. Someone from outside of the UK would need one. As a general rule, a person should always have a passport when flying anywhere in the world.
Northern Ireland is part of the United Kingdom, therefore you do not need a passport if you are travelling from other parts of the United Kingdom (England, Scotland, Wales). However, photographic identity is essential and a passport is one way to provide this.
From outside the UK a passport is required (as of 2018, it's unclear how Brexit will affect passport law, but it's likely that EU countries will need passports).
From outside the UK And the EU, passports are definitely required.
Note: babies now passports or photographic identity in their own right and cannot travel on a parent's passport. Check with the Passport Agency in the UK for further advice.
Yes, you need a passport. You can stay 90 days without a visa.
Yes
no
I am a british citizen living in northern Ireland and I am attending a wedding in Scotland. I intend to travel to Scotland to the wedding by ferry but intend to fly back to belfast. I do not have a passport but do have a Northern Ireland electoral I.D. card - will this suffice as a means of I.D. at the airport.
no - it's an internal UK ferry trip
No, Not if you a Citizen of the UK or Ireland.
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.
That will depend on your nationality. Irish and British citizens can travel between Ireland and Britain without needing a passport, though many will bring their passport with them anyway. If you are not from Ireland or Britain, then you will need a passport, and may even need a visa.
Yes South African passport holders require a visa. You cannot get an Electronic Travel Authority (ETA). You must apply in person at your nearest embassy.
You don't need a passport to travel between the UK and the Republic of Ireland.
No. You can use any passport that is legally yours.
Not from Northern Ireland as it is a part of the UK.
No. Northern Ireland is part of the UK, so the visa will cover it.
No. You don't need a passport to go to any part of Ireland from anywhere in the UK. However, due to increased security in recent years, you can't board an aircraft without an acceptable form of photo ID and a current passport is the best form of ID. If you are travelling by ferry, you won't need a passport, but it is advisable to check with whichever carrier you are planning to use as the rules could change.
It is unlikely Ireland would join the Schengen Area unless the UK also joins. There is currently a passport-free area made up of Ireland and the UK. If Ireland were to join the Schengen passport-free Area without the UK it would mean passport controls on the border with Northern Ireland, which would be politically unacceptable.