The Friday File: With more efficient planes and low fuel costs, ultra-long flights are in. The longest flight in the world is 8,810 miles, takes 17 hours and 20 minutes, and is from Auckland to Dubai. The next longest is 8,569 miles from Dallas to Sydney and takes 16 hours and 50 minutes, followed by Atlanta to Johannesburg, at 8,433 miles and 15 hours and 21 minutes long. OMG!