The first plane there was a delay.
When they got to San Paulo airport they raced to the gate their plane to Lisbon was at and just missed it.
So they had to find another plane and flew into London. I think they still had a chance at this point but when they were seated in the plane to leave again they had another delay. At this point I don't know if they were then flying to Madrid and then Lisbon or directly to Lisbon.
On this show I have mainly seen folks only have one delay or missed flight but unfortunately they had it happen 3 times to them.