Load Factor — Passenger Load Factor

How Load Factor Is Calculated

Passenger load factor is a ratio of two capacity metrics airlines already track for every flight: Revenue Passenger Kilometres (RPK) — the number of paying passengers multiplied by the distance flown — divided by Available Seat Kilometres (ASK) — the total number of seats available multiplied by distance flown. A flight with 150 of its 180 seats occupied by paying passengers has a load factor of 150/180, or 83.3%. Because it's expressed as a ratio, load factor lets airlines compare capacity utilisation across completely different aircraft types, route lengths, and networks on a like-for-like basis.

Why Load Factor Matters Commercially

An airline's costs for operating a given flight — fuel, crew, airport fees, aircraft ownership — are largely fixed regardless of how many seats are actually sold, which means load factor is directly tied to profitability through the concept of a breakeven load factor: the occupancy percentage at which ticket revenue exactly covers the flight's costs. Every seat sold above that breakeven point is close to pure margin, and every empty seat below it represents a flight losing money. This is why airlines obsess over load factor at a route and even flight-by-flight level, adjusting pricing, schedules and capacity constantly to push utilisation as close to full as demand allows.

Current Industry Benchmark

IATA reported a global average passenger load factor of 83.6% for full-year 2025, a record for full-year traffic and a slight increase (0.1 percentage points) over 2024 — achieved, per IATA's own reporting, by airlines keeping aircraft in service longer and filling more seats per flight to meet record demand even amid ongoing capacity constraints across the industry. Load factor of that magnitude — well above 80% globally — reflects how tightly airlines now manage capacity compared to decades past, when load factors in the 60–70% range were far more common.

Load Factor vs Yield

Load factor alone doesn't tell the whole profitability story — a fully booked flight sold entirely at deep-discount fares can still lose money, while a flight at a lower load factor but higher average fare (yield) can be more profitable overall. Airlines therefore manage load factor and yield together through revenue management systems, sometimes deliberately holding back the last few seats at a low fare in the hope of selling them later at a higher one, accepting a slightly lower load factor in exchange for higher total revenue.

Load Factor's Limits as a Metric

Because load factor only measures how full a flight is, not how much revenue each seat actually generated, it's best read alongside other commercial metrics rather than in isolation — a headline load-factor number, whether for a single airline or the global industry average, says how efficiently capacity is being filled but nothing on its own about whether that capacity is being filled profitably.