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In aviation, the flight length is defined as the time airborne during a flight. There are four categories: short-haul, medium-haul, long-haul and ultra long-haul.
|Short-haul flight:||Under 4 hours|
|Medium-haul flight:||3 to 6 hours|
|Long-haul flight:||6 to 12 hours|
|Ultra long-haul flight:||Over 12 hours|
Absolute distance versus flight length
A flight is typically planned to follow a direct route wherever possible to minimise flight length. For long-haul flights, the most direct route follows a great circle along the diameter of the Earth. For example, aircraft travelling westward between continents in the northern hemisphere often follow paths extending northward near or into the Arctic region. When shown on a conventional projection of a world map, the resulting route looks curved and appears longer than it really is. The great-circle distance between airports may therefore give a better indication of the shortest flight length.
However, a flight route must also take into account weather conditions, air currents, and fuel economy. A long-haul flight in an easterly direction often takes a longer more southerly route than the great circle in order to take advantage of the jet stream, a high-altitude wind that can allow an aircraft to cover a longer absolute distance using less fuel than on a more direct route.
Air time versus time zones on the ground
Time on the ground will be affected by time zones. A flight going westward, or "chasing the sun", is lengthened, and conversely an eastbound flight is shortened in terms of clock time. This does not affect the classification as long, medium, or short haul.
Airline definitions differ on what is to be considered a short-haul flight, Thomas Cook Airlines defines it as a flight taking less than three hours to complete. A short-haul flight for Cathay Pacific may be a flight between Hong Kong and Taipei or Manila. For Etihad, a short-haul might include a flight from the UAE to India. In the United Kingdom, Air Passenger Duty is levied on all flights by the UK Treasury according to banding by distance. It defines a short-haul flight as an absolute flight distance under 3,200 kilometres (2,000 mi). Most domestic flights (where the departure airport and the arrival airport are in the same country) are short-haul.
A medium-haul flight lasts from three to six hours and is typically made by an Airbus A320, Airbus A321, Airbus A319, Airbus A318, Boeing 737-300, Boeing 737-400, Boeing 737-500, Boeing 737-600, Boeing 737-700, Boeing 737-800, Boeing 737-900, Boeing 737-900 ER, Boeing 757-200, Boeing 757-300. An example of a medium-haul flight is between the United Kingdom and Egypt, which takes approximately five and half hours. Domestic flights can be medium-haul in larger countries; flights between the east and west coasts of the United States also average around five and a half hours.
A long-haul flight lasts from six to twelve hours and is typically made by a wide-body aircraft, such as the Airbus A330, Airbus A340, Airbus A350, Airbus A380, Boeing 747, Boeing 767, Boeing 777 or Boeing 787. The flight length typically requires over six and a half hours to cover and is often a non-stop flight. Only a few narrow-body aircraft such as the Boeing 757 have true long-haul capability. These aircraft are commonly used on secondary transatlantic routes. Domestic flights can be long-haul in larger countries. Some of the longest domestic flights are between Moscow and the Russian Far East (Vladivostok or Petropavlovsk-Kamchatsky), as well as between New York City and Hawaii.
Ultra long-haul flights
An ultra long-haul flight is typically made by a long-range wide-body aircraft such as the Boeing 777-200LR, the Boeing 747-8 (for example Mumbai-Newark, by Air India), the Airbus A380-800 or the Airbus A340-500, such as Dubai to Toronto and Dubai to Los Angeles by Emirates with its Airbus A380-800. These flights involve the longest distances flown by commercial aircraft, requiring over 12 hours to cover, and are also often non-stop flights. The longest such flight, Emirates Flights 448 and 449, from Dubai to Auckland (DXB-AKL), is operated by a Boeing 777-200LR. The flight will take 17 hours and 15 minutes in the westbound direction and will traverse a distance of approximately 14,210 km (8,824 miles). The flight will depart Auckland at 9:30 p.m. and arrive in Dubai at 5:45 a.m. daily. The return flight (EK 448) will leave Dubai at 10:05 a.m., arriving in Auckland at 11:00 a.m. the next day. 
Qatar Airways has announced the longest ultra long-haul flight between Auckland and Doha. The 17-hour-and-30-minute flight will commence on 3 December 2016 and will cover a distance of 14,535 km (9,032 miles) - approximately 320 km longer than the Emirates operated Dubai - Auckland flight. QR920 will depart Doha at 3:30 a.m. and arrive in Auckland at 5:50 a.m. the following day, and QR921 will depart Auckland at 2:40 p.m. and arrive in Doha at 10:10 p.m. It will be operated by a Boeing 777-200LR in a two cabin configuration, offering Economy and Business Class.
The previous longest flight, Qantas flight 8, from Dallas to Sydney (DFW-SYD) was by Airbus A380-800 with the flight before that, Singapore Airlines Flight 21 from Newark to Singapore, covered 15,343 kilometres (9,534 mi) in about 18.5 hours flight time using an Airbus A340-500.
- List of short-haul civilian aircraft post war
- List of short-haul regional airliners
- List of short-haul narrow-body airliners
- List of ultra long-haul civilian aircraft post war
- Regional airliner
- Wide-body aircraft
- Non-stop flight
- Flight distance record
- International flight
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