IBA, the aviation market intelligence and consultancy company, has released new insights into the soaring value of airport slots, as unprecedented demand at London Heathrow (IATA: LHR) continues to drive record prices.
Slot transactions at Heathrow frequently make headlines due to the high amounts airlines are prepared to pay for access. However, the underlying factors driving these valuations are often overlooked.
Analysis of Summer 2025 (S25) slot data shows supply at Heathrow is approximately 90% of recorded demand. This excludes unregistered demand, where airlines may choose not to apply due to the extremely low probability of securing a slot via the free allocation pool. As a result, very few slots are returned for reallocation, underscoring the intense competition and scarcity in the market.
“Slots are critical strategic assets, and their value is influenced by regulatory environments, market conditions, and timing,” said William McClintock, Manager, Markets & Sustainability at IBA.
IBA has an LHR transaction database with over 15 years of transactions. Many of these transactions have been fully verified via rigorous research and client intelligence. Historic Heathrow transactions illustrate the scale of valuations. In 2016, Oman Air purchased a slot pair from Air France-KLM for US$75 million – the highest publicly reported slot trade to date. The transaction coincided with Oman’s launch of its 25-year National Tourism Strategy, highlighting how slot investments often align with wider economic and strategic objectives.
Ultimately, slot values are determined by how much an airline is willing to pay to gain a competitive advantage. This dynamic has the potential to trigger pricing wars where strategic gains outweigh the high investment costs.
