The Finnish youngster dropped back from the lead on Saturday morning when a rollover cost him around one minute. He limped back to service with no windscreen, handing the top spot to William Creighton.
Creighton, however, sustained tyre damage later in the day, promoting Korhonen back in front heading into Sunday’s four-stage finale.
With Creighton’s attentions centred around maintaining his hefty advantage in the FIA Junior WRC, Korhonen pulled further clear in the final leg and ended the four-day fixture 51.5sec to the good. He now leads the series by 38 points with a clean sweep of three rally wins.
Spain’s Roberto Blach completed the podium ahead of Ali Türkkan, while Laurent Pellier - who restarted having crashed out on Saturday - placed fifth.