I took one that lasted about fourteen hours. From here (Phoenix, Arizona) to Surabaya, Indonesia.
What’s the longest you’ve spent on a plane all at the same time?
Frankfurt to Los Angeles. Just short of 12 hours. With a thumping headache and already short of sleep. :mad:
Single leg? Melbourne, Australia to Los Angeles is about fourteen hours; the return leg about 16 hours.
Unpleasant.
London to Orlando, which was only what, 9 hours or so? But definitely not as bad as the Europe-bound flight, because the cheapest was through Toronto with a 6 hour layover, and my first destination was actually Madrid, so I didn’t leave Gatwick but then had a 4 hour layover til the Madrid flight. I woke up at midnight to drive to the Orlando outgoing flight and didn’t get to sleep in a bed until midnight the following day.
California to Pretoria, with an overnight layover in NYC.
It was either JFK to Tokyo or LAX to Sydney. Both were around 14 hours and change, IIRC. Those lay-flat seats in bizclass are a lifesaver. 
Jacksonville, FL to Rota Spain. In a Navy P-3C, not a nice, comfy jet. I think it took somewhere between 11-12 hours. Oh, and they had no toilet facilities aboard except for a urinal for the men. I was the only woman aboard. Yeah, great flight.
Toronto to Vancouver. No idea how long it took, but I remember it being unpleasant.
For non-stops, Sydney-Dallas, Chicago-Dubai, Atlanta-Johannesburg are all in the 15-16 hour range, and that is way longer than one should be cooped up on a plane. For connections (not counting delayed flights), I flew from Abu Dhabi to Amsterdam (7 hours), spent 8 hours in Amsterdam, and then flew to Atlanta (7.5 hours). Did get to wander through Amsterdam for 4 hours or so, but still a long, long day.
I’ve done the non stop Chicago to Tokyo flight several times. And always preceded by a flight TO Chicago and followed by a flight onward from Tokyo!
(Returning from Singapore at the height of the SARS crisis, when most inbound flights were being cancelled, meant what should have been a 24hr, three flight journey home, became a 30+hr ordeal. Arrived into Toronto just in time for an ice storm to hit. Causing the two hr intercity transport to turn into a five hour trip on dangerous roads. Yikes!)
Vancouver to HK, diverted to Taipei, 15 hours in the air. Should have been only 13 hours but we circled HK for a while before heading to Taipei.
I rarely fly - maybe four or five times in my life. The longest flight distance wise was from St. Paul, Minnesota to New York City (and back).
The longest time wise was when I flew from Denver to Yankton SD. In Omaha NEB we switched (after a lengthy layover) planes to “the blue goose” (a local subisdiary of I forget which airline) which was a very anitquated and small plane that went up and down to just about every small airport in a good chunk of Nebraska and the lower portion of South Dakota.
I think it was Los Angeles to Hong Kong, around 14 hours. The longest overall journey was Kathmandu, Nepal to Cincinnati, around 40 hours.
Detroit=>Nova Scotia=>Reykjavik=>Brussels, 11 hours on Sabena airlines. Wasn’t the quickest way to get to Europe but at the time it was the cheapest.
San Francisco to Paris, 10.5 hours. It was a redeye. And because I was inexperienced about airline seating, I accidentally booked us seats just in front of an emergency row, and our seats did not recline. We arrived dangerously exhausted and had to deal with car rental and French highway signage before we could get to our hotel and collapse into bed.
San Francisco to Sydney. IIRC, about 16 hours. This was before smoking had been banned on airline flights, and the smoking section began 2-3 rows behind my seat. :mad:
Man, I’ve been fortunate with my flights, nowhere near any of these. Longest single leg by distance, HNL-ATL; by time, CDG-ATL. Actually Paris-Atlanta is 91 miles shorter than the Honolulu-Atlanta, but on the HNL-ATL flight we caught a Jet Stream tailwind and made it in like 7 and a half hours while the transatlantic flight took a bit over 9. But that HNL flight had me in a last row seat aboard a well-seasoned discontinued-model plane of a domestic carrier. The one from Paris saw me on a fresher current model plane wearing AirFrance colors so it was a bit more pleasant.
My shortest commercial hop has been SJU-STT, which is 70 miles and you fly in a virtual straight line from the E end of the SJU runway to the W end of the STT runway. You spend as much time taxiing as flying.
Longest leg was Frankfort to Washington. That’s about 9 hours, depending upon how bad the headwinds were. I don’t really recall if the flight arrived on time.
For sheer length of trip including layovers I’ve had 30+ hours to cover a net 1065 miles when flights did not synch up flying GCM --> MIA --> BOG --> PEI.
It would either be the one from San Bernadino, CA to Da Nang, RVN, or the one from Kampala, Uganda to Anchorage, AK. Probably the former, as I had to change planes a couple of times from Uganda; but it was 12 time zones, so it seemed like forever. I seem to recall that the trip to Vietnam took 23 hours, but there was one stop for refueling and crew change, probably in the Philippines.
I’ve never been anywhere in the eastern hemisphere. so I’m nowhere near the maximums reported by most of y’all.
Longest single flight for me was Houston-Frankfurt at 11:15, followed by Paris - Johannesburg at just under 11.
Longest multi-leg was again Houston-Frankfurt, 4-hour layover then Frankfurt-Abu Dhabi, for a total of 22:30. I was fairly wrecked by the end of that one.