As per data from aviation analytics company Cirium, the longest direct flight from Australia is over 25 hours in length. Australia's Longest Flights ExploredCredit: ShutterstockAustralia has seven routes with a block time of 21 hours or above, all of which are one-stop itineraries. The longest nonstop flights nowadays are around 19 hours of flying, but the longest direct services can reach almost 26 hours. The Perth-Paris leg also ranks as one of the longest nonstop segments in commercial aviation, measuring in at 7,700 nautical miles (14,265 km). Related Over 17 Hours: Australia & New Zealand's Longest Nonstop Flights Five airlines operate eight airport pairs.