Mr Key entered the final day buoyed by four polls in the last 24 hours showing it has enough support to lead the next government.
Mr Key shook hands and chatted to commuters today hammering home National's message to vote for change.
He was challenged by one young voter on National's plans to introduce a 90-day probation period for new workers, but received a cordial response from most others.
About 50 placard-bearing National supporters turned up to see Mr Key.
The Wellington campaigning is part of a whistle-stop tour that has seen Mr Key charter a plane to blitz eight towns and cities in the last two days of the campaign.
Mr Key will fly into Palmerston North and New Plymouth today before ending up in Auckland where he will hit the malls and hold a series of rallies.
He will close his campaign with a rally in his Helensville electorate about 6pm.
All campaigning as well as media reports that could sway voters are banned from midnight.