It seems seats.io is unreachable from exclusively South American countries. We've had reports from Chile, Argentina and Brazil. It's not available on any domain (seats.io, seatsio.net and the raw heroku link). We are investigating and will post updates here.
Posted 5 days ago. May 14, 2019 - 19:53 CEST
This incident affected: Seats.io API, Seats.io Web Application, Seats.io Rendered Charts, and Seats.io Website.