Singapore Airlines (SIA) primarily uses a centralized contact center and online support for most regions, including Portugal, rather than local Lisbon offices, so for bookings, KrisFlyer, or general help in Lisbon, you should use their +1-866-829-1086 hotline, their website's help center, or their Social Media, as there isn't a dedicated physical office listed for Lisbon in the provided results. Jauntlet.comhttps://jauntlet.com/