A typical single-aisle jet like a Boeing 737 or Airbus A320 burns roughly 75 to 120 kilograms of fuel (about 25 to 40 gallons) during the takeoff roll alone, which lasts only 30 to 40 seconds. But if you’re asking about the full departure, from the moment the engines spool up to the point the aircraft levels off at cruising altitude, the number jumps to roughly 800 to 1,000 kilograms (250 to 320 gallons). For a wide-body like a Boeing 777 or 747, those figures can triple or quadruple.
What Counts as “Takeoff”
The answer depends on where you draw the line. The takeoff roll, from brake release to wheels off the ground, is the shortest and most intense phase. Engines run at or near full power for less than a minute. But the aircraft is far from done burning heavy fuel at that point. The climb to cruising altitude (typically 30,000 to 40,000 feet) takes another 15 to 25 minutes, and engines stay at high thrust settings through most of it. Pilots and airlines typically lump the takeoff roll and initial climb together as the “departure” phase when calculating fuel.
Fuel Burn by Aircraft Size
Fuel consumption during departure scales directly with the size and weight of the aircraft. Here’s roughly what different categories burn from brake release through the climb to cruise altitude:
- Narrow-body jets (A320, 737): 800 to 1,000 kg (250 to 320 gallons). These aircraft have two engines, each burning roughly 1.2 to 1.5 kg per second at full takeoff thrust.
- Wide-body twins (777, A330): 2,500 to 3,500 kg (800 to 1,100 gallons). MIT research using flight data recorders shows the Boeing 777’s fuel burn at taxi idle runs about 0.034 kg per second per engine, but at full takeoff power that figure increases by more than tenfold.
- Four-engine heavies (747, A380): 4,000 to 5,500 kg (1,250 to 1,750 gallons). With four engines at full thrust, these aircraft consume fuel at roughly 12 to 15 kg per second during the takeoff roll itself.
- Business jets (Gulfstream G650): 300 to 500 kg (100 to 160 gallons). The G650 burns about 500 U.S. gallons per hour at cruise, but the departure phase at higher thrust settings concentrates fuel burn into a shorter window.
Why the Takeoff Roll Burns So Much Per Minute
During the takeoff roll, engines operate at or near 100% thrust. The International Civil Aviation Organization (ICAO) defines four standard engine power settings for emissions testing: 7% for taxiing, 30% for approach, 85% for climb, and 100% for takeoff. That jump from idle to full power means an A320 engine goes from burning about 0.0125 kg per second at taxi to well over 1 kg per second at takeoff thrust. It’s the most fuel-intensive moment of the flight on a per-minute basis, even though the phase lasts under a minute.
Once airborne, pilots reduce to climb thrust (roughly 85% power) and continue burning fuel at a high rate as the aircraft gains altitude. Fuel consumption drops steadily as the plane climbs because the air thins out, reducing drag, and the aircraft burns off its own weight. By the time it reaches cruise altitude, fuel flow has typically dropped to about half of what it was during the takeoff roll.
Taxiing Adds More Than You’d Think
Before the takeoff roll even begins, the aircraft has already been burning fuel on the ground. A single-aisle jet at a busy airport might taxi for 15 to 30 minutes. At idle thrust, an A320 with two engines burns roughly 90 to 120 kg of fuel during a 20-minute taxi. At major hubs where delays are common, taxi fuel can approach the amount burned during the takeoff roll itself. Some airlines have adopted single-engine taxiing or electric tug towing to cut this cost.
What Makes One Takeoff Burn More Than Another
Two identical aircraft departing from the same runway can use noticeably different amounts of fuel depending on conditions.
Aircraft weight is the single biggest variable. A fully loaded wide-body at maximum takeoff weight needs more thrust and a longer roll to get airborne, burning more fuel in both phases. A lightly loaded repositioning flight might use 15 to 20% less departure fuel than the same plane packed with passengers and cargo.
Temperature matters too. Hot air is less dense, which means engines produce less thrust and wings generate less lift. On a scorching afternoon, a plane needs a longer takeoff roll and may have to reduce its payload to meet runway performance requirements. Aviation Week has reported that rising temperatures are already forcing some operators to add fuel stops or limit afternoon departures at airports in hot climates.
Flap configuration creates smaller but measurable differences. Airbus data shows that using higher flap settings on an A320 adds 3 to 13 kg of fuel per takeoff compared to the lowest available setting. That sounds trivial on a single flight, but for an airline operating thousands of departures per day, it adds up to millions of dollars annually. Pilots also have the option of using reduced (flex) thrust on takeoff when the runway is long enough, which slightly increases fuel burn by about 1 to 5 kg but saves significantly on engine maintenance costs.
How Takeoff Compares to the Full Flight
Despite being the most intense phase, the departure from brake release to cruise altitude accounts for a relatively small share of total trip fuel. An A320 flying a typical two-hour domestic route burns roughly 2,500 to 3,000 kg total. The 800 to 1,000 kg departure burn represents about 30 to 35% of that. On a long-haul flight, the proportion shrinks further. A 777 crossing the Atlantic might burn 50,000 to 60,000 kg over ten hours, making the 3,000 kg departure phase only about 5 to 6% of the total.
Cruise is where the vast majority of fuel goes, simply because it lasts so much longer. But takeoff and climb are where the engines work hardest, where the fuel flow rate peaks, and where small operational decisions (flap settings, thrust levels, climb profiles) compound into meaningful savings over time.