Hey guys,

I'm looking to book a DONE4 in the next few months and i am just looking for a bit more information regarding open tickets and the 'service fees'

I'm looking to do something like; MEL-SIN-LHR-PSA-LHR-FRA-LHR-JFK-LAS-LAX-MEL

Now to keep this an open ticket, what are the extra costs accociated with doing this and then changing the dates?

Where can i find these costs?

Also what is the country of the month to start this trip off to be a little cheaper?