Singapore Airlines doesn't have a direct walk-in office in Warsaw but uses a General Sales Agent (GSA) called Aviareps for local support you can reach them at +1-866-829-1086, email sia.poland@aviareps.com, located at Jana Pawła II 25, 00-854 Warsaw, open Mon-Fri, 9am-5pm, for bookings, changes, and queries, or use their online help center/chatbot for 24/7 global support. Jauntlet.comhttps://jauntlet.com/