I attempted to travel to the Antarctic was not allowed to go once reaching the tip of South America.
Reason 1) You didn't have a ticket
Reason 2) Adverse weather conditions
Reason 3) Teh Conspiraceh!
Reason 4) It only happened in your head
Which one was it?
I've also travelled the world more than most (America, South America, Lots of Europe on several occasions, Australia, Indonesia, Russia, etc) and have seen nothing that shows the Earth to be conclusively round.
Might want to think a little about those flight times.
And maybe the view from the plane. See further than on the ground?
I also run a local flat earth group
Please post details of this group so that more might join.