US To Philippines Visa WaiverInstead of applying for a visa beforehand, US citizens simply present a valid passport with at least six months of validity to the immigration counter when entering the country. Note that using a visa waiver still requires US citizens to present proof of an onward departure ticket.
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Philippines - Level 2: Exercise Increased Caution. Reissued with obsolete COVID-19 page links removed. Exercise increased caution to the Philippines due to crime, terrorism, civil unrest, and kidnapping.
If you would normally require a visa to enter the UK, then you will have to apply for one even if you have a Green Card. Unfortunately, a Green Card does not allow the holder to enter the UK just like it does not allow them to enter the European Union.