Originally Posted by
ac777
Any changes to the RTW flights ( except the first one) do not cost anything. So book the ticket and change the last leg at your leisure. BTW--if you do NOT use the last leg the issuing carrier has the right to calculate your trip as if you did one way flights and charge you the difference, if any. I don't know if any airline enforces this rule.
No fees only for changes in dates and times but not routing.