Flightradar24 shows that JFK-Beijing had a flight time of 15h 50m to 16h 23m between September 20th and 25th. In contrast, Korean Air from JFK back to Seoul took between 14h 22m and 15:28. Air China always had a more northerly routing and presumably covered more distance in practice.
The five longest 747 routes
October
They are summarized in the following table. If you are considering it by distance, Korean Air on the SkyTeam link between Seoul Incheon and Atlanta is the world's longest 747 flight.
However, if you would prefer block time, which varies in each direction based on wind, airport slots, congestion, and so on, Air China from JFK back to Beijing Capital is first – despite only raking fourth by distance. Block time is published on websites and in timetables and includes flight time, taxi time at both ends, and time for short delays. It should be short enough to be competitive but long enough to ensure good punctuality.
Flightradar24 shows that JFK-Beijing had a flight time of 15h 50m to 16h 23m between September 20th and 25th. In contrast, Korean Air from JFK back to Seoul took between 14h 22m and 15:28. Air China always had a more northerly routing and presumably covered more distance in practice.
