Qantas, Perth to London Heathrow: 17 hours and 15 minutes. Air New Zealand, Auckland to New York JFK: 17 hours and 50 minutes. Singapore Airlines, Singapore to New York JFK: 18 hours and 50 minutes.Yes, those are nonstop flights, and those times don’t include boarding, deplaning, and everything else on either side. So, if you’re soon planning on spending just a few hours flying across the country or to the other side of the pond, know this – surviving a long-haul flight is very possible, to extremes that you may not have even known existed!