Hi Aroa:
Thanks for asking.
Regarding your question, as your flight arrives in the Republic of Ireland and you will be returning from Northern Ireland, you will need to have a passport in hand to show it to the relevant authorities. 🛂
You can find more information on this topic on the
Visas and Passports page.
In any case, I would also recommend contacting your airline or the
British embassy to get confirmation on that.
Oh, and if you have any other questions about an itinerary, what to visit, how to get there, I can answer you in Spanish too. 😀
I hope you have a nice day! ☘️
Cristine