According to the US Department of Transportation, approximately 77 million passengers traveled between the United States and Europe in the year leading up to November 2024. This figure represents over 30% of international travelers from the US. During this period, more than 37 airlines operated over 500 routes connecting over 340 airport pairs, achieving an average seat load factor of 83%.
An airline’s seat load factor is a measure of how much available capacity is utilized by passengers or revenue passenger miles. If there is too much capacity compared to demand, fares may decrease while load factors increase. Conversely, if capacity is insufficient for demand at a given price point, fares might rise while load factors drop.
In an analysis of over 500 routes during this timeframe, ten routes were identified as having the highest load factors. These routes were predominantly point-to-point and focused on leisure or visiting friends and relatives traffic. Notably, three of these routes offered only weekly services, benefiting from limited capacity and specific demand characteristics.
The average load factor for each route was calculated based on its operational period within the examined year. For instance, Delta’s New York JFK-Prague service varied between 87.9% and 98.0% in load factor from May to October 2024.
Iberojet emerged as the top performer with its Madrid to Orlando route reaching a load factor of 99.1%. This route began in June 2024 and operated weekly through September using A350-900 aircraft.
Other notable high-load-factor routes included Kraków to Chicago O’Hare operated by LOT Polish Airlines with a load factor of 93.9%, and American Airlines’ Chicago O’Hare to Athens route at 93.7%.
While high load factors can indicate strong performance, they do not necessarily correlate with financial success unless costs are sufficiently low relative to yields generated by passengers.
