Heathrow Issues Warning as Iran War Threatens to Reduce Passenger Numbers

Airspace closures, rerouted flights, and rising costs are the full impact of the Iran war on British travellers.

Heathrow Airport has issued a formal warning that passenger numbers are expected to be impacted for the remainder of 2026, as the ongoing conflict in Iran continues to disrupt global air travel. The alert was raised in the airport's latest quarterly trading update, published in late April 2026, coming at a particularly sensitive time with millions of British holidaymakers in the process of finalising their summer travel plans.

In the first three months of 2026 alone, 18.9 million people passed through Heathrow's four terminals — a 3.7% rise compared to the same period last year. The airport attributed this temporary surge to passengers rerouting away from disrupted Middle Eastern hubs. However, Heathrow was clear that this short-term boost is unlikely to be sustained while significant uncertainty in the region continues.

The Middle East sits at the heart of some of the world's busiest flight corridors. Major airports in Dubai, Doha, and Abu Dhabi collectively handle hundreds of thousands of connecting passengers every day, serving as essential bridges between Europe, Asia, and Australia.

When the conflict in Iran broke out on 28 February 2026, airspace closures across the region had an immediate and widespread impact on international aviation. Airlines were forced to reroute flights, journey times increased, and operational costs rose sharply. Although much of the regional airspace has since reopened, passenger confidence has been slow to recover, and a large number of travellers are still choosing to avoid the region entirely — a hesitation that is now being felt at airports across the UK.

Adding to the pressure is a long-standing issue that the current conflict has brought sharply into focus. Heathrow's Chief Financial Officer, Sally Ding, confirmed in the trading update that the airport is currently operating at full capacity. She noted that this results in fewer route choices and higher fares for passengers, as well as missed economic opportunities for the wider UK.

Heathrow has reaffirmed its commitment to building a third runway and its readiness to proceed, subject to the appropriate government approvals. Without that additional capacity, the airport remains vulnerable to exactly the kind of disruption that global events such as the Iran conflict produce.

The situation does not mean travel plans need to be abandoned. Most popular holiday destinations remain fully operational and accessible. However, routes connecting through Gulf hubs may see reduced availability or adjusted timings, and fares on some routes may be elevated.

At Crystal Travel, our team is monitoring the situation closely and is here to help you plan and book with complete confidence. Get in touch with us today.