How long needed on passport to travel to FinlandFinland
UK passport holders require 6 months left on their passport
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You don't need a passport to travel between the UK and the Republic of Ireland.
It must at least have three months left.
You need at least 3 months left from the time that you depart for US. But many countries need at least 6 months left of passport validity for international travel.
As long as you are an EU citizen, you will not need a passport to travel to any EU country. As a Hungary resident, you can travel with only your ID to Greece from UK.
You can travel immediately after acquiring a passport.
According to the State Department website and the airlines (USAirways) your passport just needs to be valid for your travel dates. As long as you are back before your passport expires, you are OK.
A person may still travel to any country as long as the passport is not expired. How long before it expires is not taken into account unless the passport expires before the traveler is expected to return.
Usually at least six months but it may differ by country.
You need a minimum of 6 months from your date of return