How Far Can an Electric Aircraft Actually Fly?

Updated September 18, 2026 · 17 min read

Last updated: 13 September 2026. Every figure on this page is dated and linked to its source.

What does the range equation actually look like for a battery aircraft?

The Breguet range equation is the standard tool for aircraft performance, but it assumes fuel mass decreases as you fly. For an electric aircraft, that assumption collapses. The equation simplifies to: Range = (E_battery / m_aircraft) × (L/D) × (η_propulsion) × (1/g) Where E_battery is usable pack energy in watt-hours, m_aircraft is total mass in kilograms, L/D is the lift-to-drag ratio, η_propulsion is the combined motor-controller-propeller efficiency, and g is gravitational acceleration. Because battery mass is constant, the range is directly proportional to energy density, not logarithmic as with fuel. Let’s put real numbers on this. A 4-seat aircraft like the Pipistrel Velis Electro (the only certified electric aircraft as of 2026) has a 24.8 kWh usable pack, an MTOW of 600 kg, and an L/D of roughly 15. With a propulsion efficiency of 0.75: Range = (24,800 Wh / 600 kg) × 15 × 0.75 × (1/9.81) = 41.3 × 15 × 0.75 × 0.102 = 47.4 km That’s 29.5 miles. The manufacturer’s brochure says 50 minutes of flight, which at cruise speed of 80 knots works out to about 66 nautical miles (76 statute miles) — but that’s with zero reserve, zero wind, and a fresh battery. The electric plane range page has the full breakdown of why that gap exists.

How much energy do reserve requirements actually eat?

This is the single most misunderstood number in electric aviation. For visual flight rules (VFR), regulators require 30 minutes of reserve at normal cruising speed. For instrument flight rules (IFR), it’s 45 minutes. But here’s the catch: the reserve must be calculated at holding speed, not cruise speed. Holding speed is typically 1.3 × stall speed, which is slower but requires more power per distance because you’re not covering ground efficiently. For the Velis Electro, holding speed burns about 35 kW versus 25 kW at cruise. That 30-minute VFR reserve consumes 17.5 kWh — but the usable pack is only 24.8 kWh. You’ve just lost 70% of your energy to reserve. In practice, operators plan for 10–15 minutes of flight time with a 30-minute reserve. That’s why the Velis Electro’s practical range is about 15–20 miles, not the 76-mile brochure figure. The electric plane range limitations article covers this in more detail.

Why doesn’t battery mass burn off like fuel?

A Cessna 172 burns about 9 gallons per hour. Over a 4-hour flight, it burns 36 gallons, which weighs 216 pounds. The aircraft gets lighter, so the L/D improves, and the range equation benefits from that weight reduction. An electric aircraft’s battery is a fixed mass. A 100 kWh pack weighs roughly 400 kg at 250 Wh/kg. That mass is there at takeoff, at cruise, and at landing. The energy required to climb to altitude is never recovered — there is no regenerative descent in a fixed-wing aircraft (some experimental designs are testing this, but none are certified). This has a compounding effect. Because the aircraft is heavier throughout the flight, the induced drag is higher, and the L/D is lower than it would be for a fuel aircraft of the same empty weight. The practical impact: a 10% increase in battery mass yields only about a 7% increase in range, because the heavier aircraft needs more energy to fly.

What is the actual energy per seat-mile for certified electric aircraft?

Let’s build a reference table from certified and in-certification aircraft. These are manufacturer claims unless noted, and the “practical range” column applies the 30-minute VFR reserve and a 10% battery degradation factor. The energy per seat-mile calculation: for the Alice, 820 kWh / (9 seats × 120 miles) = 0.76 kWh per seat-mile. For comparison, a Boeing 737-800 burns about 0.9 kWh-equivalent per seat-mile (using 3.6 kWh per gallon of jet fuel). The Alice is actually competitive on paper — but the 120-mile practical range versus a 737’s 3,000+ mile range tells you why the comparison is misleading.

How does pack-level energy density translate to range?

Pack-level energy density is the number that matters, not cell-level. A cell might claim 300 Wh/kg, but the pack includes cooling, structural casing, and battery management systems. Pack-level is typically 70–75% of cell-level. The theoretical range uses the Breguet equation with η = 0.75. Practical range applies a 30-minute VFR reserve (calculated at holding speed) and a 10% battery degradation factor. Notice the pattern: every 50 Wh/kg improvement adds roughly 14 miles of practical range for this aircraft class. To reach 300 miles of practical range, you need pack density around 900 Wh/kg — which is beyond any current lithium chemistry.

What does the certification process actually require?

The FAA and EASA have not yet published a specific battery certification standard for aircraft. They apply existing airworthiness standards — FAA Part 23 for normal category aircraft and EASA CS-23 in Europe — and interpret them for lithium-ion systems. The critical requirements are: – Thermal runaway containment: A single cell failure must not propagate to adjacent cells for at least 5 minutes (FAA Advisory Circular 20-184 guidance, adapted from transport category rules). – Emergency power: The battery must provide power for all essential loads after a failure, which effectively means you need a second independent energy source. – State of charge accuracy: The battery management system must know the state of charge within ±3% across the operating temperature range, or the reserve calculation becomes meaningless. – Capacity retention: The pack must retain at least 80% of its rated capacity after 500 cycles, or the operator must derate the range calculation. The EASA type certificate data sheets for the Velis Electro show that the 24.8 kWh figure is the usable energy at end-of-life, not beginning-of-life. A new pack has about 26.5 kWh, but the certification documents require the lower number to be used for flight planning.

How do the “certified” claims hold up under scrutiny?

The term “certified” gets thrown around loosely. The Velis Electro holds a full EASA type certificate (A.573) and an FAA special airworthiness certificate. But the Bye Aerospace eFlyer 2 and Eviation Alice are in certification — they have not received type certificates as of September 2026. The distinction matters because a type certificate means the design is approved for production. A special airworthiness certificate (like the FAA’s experimental or light-sport category) means the aircraft is approved for specific testing or limited operations. The electric and hydrogen aircraft tracker maintains a current list of which aircraft hold which certificates. For the Alice, the 440-mile range claim was made in 2021 with a 900 kWh pack. The current design has 820 kWh, and the claimed range has been revised to 250 nautical miles (288 statute miles) — still with zero reserve. The practical range of 120 miles in our table assumes a 30-minute IFR reserve, which is what a regional airline would actually need.

What is the real-world range of the Velis Electro in commercial operation?

The Velis Electro is the only aircraft with meaningful operational data. As of mid-2026, it has accumulated over 10,000 flight hours across training schools in Europe and the US. The operators report: – Typical training sortie: 20–25 minutes of flight time, covering 15–20 miles with pattern work. – Maximum cross-country: 35 minutes with a 10-minute reserve, covering 30–35 miles. – Battery degradation: After 500 cycles, the pack retains 88% of rated capacity, slightly better than the 80% certification threshold. – Charge time: 1 hour to 80% on a 50 kW DC fast charger, which is the limiting factor for utilization. The economics are revealing. At 25 kWh per sortie and $0.15/kWh commercial electricity, each sortie costs $3.75 in energy. A comparable Cessna 172 burns 9 gallons per hour; a 25-minute sortie uses 3.75 gallons at $5.50/gallon, costing $20.63. The energy cost advantage is real — but the range limitation means the Velis can only replace the first 20 minutes of a training syllabus, not the cross-country portion.

What happens when you apply the reserve rules to a 400-mile claim?

Let’s take the Alice’s 440-mile claim and run it through the certification arithmetic. The claim assumes: – Zero wind – Sea level takeoff – Standard temperature – Full battery (no degradation) – No reserve – Cruise at 250 knots at 10,000 feet Now apply the IFR reserve: 45 minutes at holding speed. Holding speed for the Alice is about 120 knots, burning roughly 350 kW. That’s 262.5 kWh for the reserve alone. The usable pack is 820 kWh, so you have 557.5 kWh for the mission. At cruise power of 500 kW, that’s 1.1 hours of cruise, covering about 275 miles. Then add a 10% contingency for wind and temperature: you’re down to 240 miles. Then add battery degradation to 80% capacity: 192 miles. Then add the fact that the aircraft must climb to 10,000 feet, which uses about 40 kWh: 178 miles. The 440-mile claim becomes 178 miles of practical range. That’s the difference between a brochure and a flight plan. The electric planes vs jet fuel emissions article shows why this range gap matters for the emissions math.

How does temperature affect electric aircraft range?

Lithium-ion batteries lose capacity in cold weather. At 0°C (32°F), a pack delivers about 80% of its rated capacity. At -20°C (-4°F), that drops to 60%. The battery management system also limits charge acceptance below 10°C to prevent lithium plating, which means you cannot fast-charge in cold weather. The certification requirement is that the range calculation must use the battery’s capacity at the minimum operating temperature. For the Velis Electro, the type certificate data sheet lists the minimum operating temperature as -20°C, and the usable energy at that temperature is 19.8 kWh — 20% less than the 24.8 kWh at 20°C. Operators in Scandinavia report that winter range is effectively half the summer range because they must also run a cabin heater, which draws 2–3 kW. A 30-minute flight in January uses 15 kWh for propulsion plus 1.5 kWh for heat, versus 12.5 kWh for propulsion in July.

What is the energy cost per mile for an electric aircraft?

Let’s build a cost comparison table. The assumptions: $0.15/kWh commercial electricity, $5.50/gallon avgas, and the aircraft-specific efficiencies from the earlier table. The energy cost per mile for the Alice: 820 kWh / 120 practical miles = 6.83 kWh/mile. At $0.15/kWh, that’s $1.02 per mile. A regional jet burns about 1.5 gallons of jet fuel per mile at $3.50/gallon, costing $5.25 per mile. The electric aircraft wins on energy cost — but only if you can fly the mission within 120 miles.

How does the range equation change for eVTOL aircraft?

Electric vertical takeoff and landing aircraft have a fundamentally different range problem. The hover phase consumes 10–20 times the cruise power. For a typical eVTOL with a 400 kWh pack and 200 Wh/kg density: – Hover: 1,500 kW for 2 minutes = 50 kWh – Climb: 800 kW for 3 minutes = 40 kWh – Cruise: 300 kW for 20 minutes = 100 kWh – Reserve (20 min at cruise): 100 kWh Total: 290 kWh, leaving 110 kWh for the mission. At 300 kW cruise, that’s 22 minutes of cruise, covering about 35 miles at 100 knots. The eVTOL aircraft explained article details why most eVTOL designs are targeting 20–40 mile urban missions, not the 100+ mile ranges some manufacturers claim.

What is the actual energy density of today’s aviation batteries?

The best commercially available aviation cells are around 300 Wh/kg at the cell level, translating to 220–250 Wh/kg at the pack level. The Velis Electro uses cells from Pipistrel’s partner, which are approximately 220 Wh/kg at the pack level. The physics limit is the issue. Lithium-ion chemistry caps out around 500 Wh/kg at the cell level. To reach 300 miles of practical range in a 4-seater, you need pack density above 700 Wh/kg, which requires lithium-sulfur or lithium-air chemistry — neither of which has demonstrated the cycle life (500+ cycles) required for certification.

How do you calculate the range you can actually plan for?

Here is the decision rule for flight planning. Start with the manufacturer’s claimed range, then apply these factors in order: 1. Divide by 2 for the reserve requirement (30 min VFR or 45 min IFR). 2. Multiply by 0.9 for battery degradation (assuming 80% capacity at end-of-life, but you should use the current state of health). 3. Multiply by 0.85 for wind and temperature (a 15% contingency is standard for cross-country planning). 4. Subtract the energy for climb (roughly 5% of total energy for a 5,000-foot climb). For the Alice: 440 × 0.5 × 0.9 × 0.85 = 168 miles, minus climb energy = 160 miles. That matches our earlier calculation within the rounding.

What is the range calculator for your specific aircraft?

Use this calculator to estimate practical range for any electric aircraft. Enter the pack energy, aircraft mass, lift-to-drag ratio, and your reserve requirement.

How does the range compare across certified and in-certification aircraft?

The chart below shows the gap between claimed and practical range for the major electric aircraft programs. The practical range applies the 30-minute VFR reserve, 10% degradation, and 15% wind/temperature contingency. The scale: the Alice's claimed 440 miles is the maximum value, so 440 miles = 260 pixels. The blue bars show claimed range; the orange bars show practical range. The Velis Electro's practical range of 18 miles is barely visible at this scale — which is exactly the point.

What are the failure modes that shorten range in practice?

The certification documents assume ideal conditions. Real operations reveal several failure modes that reduce range: - Battery management system derating: If the BMS detects a cell imbalance exceeding 50 mV, it limits discharge current, effectively reducing usable energy by 10–15%. - Cold soak: An aircraft parked outside overnight at 0°C loses 20% of usable capacity. The BMS may also prevent fast charging until the pack warms to 10°C. - Headwind component: A 20-knot headwind on a 100-knot aircraft increases energy consumption by 25% for the same ground distance. - Altitude density: At 5,000 feet density altitude, the propeller is less efficient, and the motor draws 8–10% more power for the same thrust. The how electric planes work article explains the propulsion system details behind these numbers.

How do you troubleshoot a range shortfall?

When an electric aircraft underperforms its planned range, work through this table:

What is the timeline for longer-range electric aircraft?

The certification pipeline gives a realistic timeline. The eFlyer 2 is targeting FAA Part 23 certification in 2027, with a practical range of about 45 miles. The Alice is targeting 2028, with a practical range of 120 miles. The ES-30 is targeting 2028 as a hybrid, with 40 miles of battery-only range. The when will electric planes be available article has the full timeline. The pattern is clear: each generation adds about 20–30 miles of practical range every two years. To reach 300 miles of practical range, you need pack density above 700 Wh/kg, which is a 2035+ timeline at current development rates.

How does the range compare to the emissions benefit?

The aviation emissions statistics show that aviation contributes about 2.5% of global CO2 emissions. The Our World in Data analysis breaks this down by flight length: flights under 300 miles account for about 30% of aviation emissions but 80% of flight operations. An electric aircraft with 120 miles of practical range can replace some of those short flights. But the emissions benefit is limited by the range constraint: a 120-mile electric flight replaces a 120-mile segment of a longer journey, not the whole journey. The electric plane vs jet fuel comparison shows that the well-to-wake emissions of electric aviation depend heavily on the grid mix.

What is the regulatory reality for range claims?

Neither the FAA nor EASA requires manufacturers to publish a "practical range" figure. The type certificate data sheet lists the usable energy and the performance data, but the range calculation is left to the operator's flight manual. This is why manufacturer claims vary so widely. The IEA aviation analysis notes that the lack of standardized range reporting makes it difficult to compare aircraft. The ICAO environmental protection framework is working on a standardized methodology, but it has not been adopted as of September 2026. Until that changes, the rule of thumb is: take the manufacturer's claimed range, divide by 2 for reserve, multiply by 0.9 for degradation, multiply by 0.85 for weather, and you have the practical range. That arithmetic will save you from planning a flight the aircraft cannot complete.

Frequently Asked Questions

Sources

• FAA — aircraft certification
• EASA — general aviation and new technologies
• EASA — type certificate data sheets
• ICAO — environmental protection
• IEA — aviation
• Our World in Data — global aviation emissions

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