The US and Israel’s attack on Iran continued to cause severe disruption to flights throughout the Middle East and beyond on Sunday.

Countries across the region closed their airspace, and three of the key airports that connect Europe, Africa and the west to Asia halted operations.

Hundreds of thousands of travellers were either stranded or diverted to other airports after Israel, Qatar, Syria, Iran, Iraq, Kuwait and Bahrain shut their airspace. There were also no flights over the United Arab Emirates, the flight tracking website FlightRadar24 said, after the government announced a “temporary and partial closure” of its airspace.

That led to the closure of airports in Dubai, Abu Dhabi and Doha and the cancellation of thousands of flights by major Middle Eastern and global airlines, including British Airways and Virgin Atlantic.

The three major airlines that operate at those airports – Emirates, Qatar Airways and Etihad – typically have about 90,000 passengers a day passing through those hubs, and even more travellers headed to destinations in the Middle East, according to the aviation analytics firm Cirium. Dubai is the world’s busiest airport for international traffic.

On Sunday, more than 3,400 flights were cancelled across the seven main airports in the Middle East. Emirates said all operations to and from Dubai had been suspended until 3pm UAE time on Monday.

Qatar Airways said it would resume operations when the Qatar Civil Aviation Authority announced the safe reopening of Qatari airspace, adding that it would provide a further update by 9am Doha time on Monday. Etihad said flights to and from Abu Dhabi were suspended until 2am UAE time on Monday.

Major international airports in the region also became targets of Iran’s retaliatory strikes. Dubai’s international airport and its landmark Burj Al Arab hotel sustained damage and four people were injured. Abu Dhabi Airports said in a post on X that an incident at Zayed international airport in the UAE’s capital resulted in one death and seven injuries. It later deleted the post.

Airspace over Iran, Iraq, Kuwait, Israel, Bahrain, the UAE and Qatar remained virtually empty, maps by Flightradar24 showed on Sunday.

Passengers bound for the Middle East wait at Tribhuvan international airport, Nepal. Photograph: Skanda Gautam/Zuma/Shutterstock

The tracking service said a new “notice to airmen” had extended closure of Iranian airspace until at least 8.30am UK time on Tuesday.

Henry Harteveldt, an airline industry analyst and president of Atmosphere Research Group, said: “For travellers, there’s no way to sugarcoat this. You should prepare for delays or cancellations for the next few days as these attacks evolve and hopefully end.”

According to Cirium, of about 4,218 flights scheduled to land in Middle Eastern countries on Saturday, 966 (23%) were cancelled. It said the number of cancellations rose above 1,800 if including outbound flights.

The website FlightAware said more than 18,000 flights had been delayed globally and more than 2,350 cancelled worldwide as of 10.30pm GMT on Saturday.

Airlines that are crossing the Middle East will have to reroute flights around the conflict, with many flights headed south over Saudi Arabia. That will add hours to those flights and consume additional fuel, adding to the costs airlines will have to absorb. So ticket prices could quickly start to increase if the conflict lingers.

The added flights will also put pressure on air traffic controllers in Saudi Arabia who may have to slow traffic to make sure they can handle it safely.

“It’s the sheer volume of people and the complexity,” said John Strickland, a UK-based aviation analyst. “It is not only customers, it is the crews and aircraft all over the place.”

On Sunday, Austrian Airlines sent an evacuation flight to Muscat, the capital of Oman, to return staff and crew unable to fly from Dubai.

The airspace closures in the Middle East could be exacerbated by the fighting between Pakistan and Afghanistan, squeezing airlines into even narrower flight corridors.

“Any escalation in the conflict between Pakistan and Afghanistan that results in the closure of airspace would have drastic consequences for travel between Europe and Asia,” said Ian Petchenik, a communications director at Flightradar24.

Passengers whose flights were cancelled wait at the departure terminal of Rafik Hariri international airport in Beirut, Lebanon Photograph: Hassan Ammar/AP

It is unclear how long the disruption to flights could last. The situation was changing quickly and airlines urged passengers to check their flight status online before heading to the airport.

Nearly half – 24 out of 56 – of the flights scheduled to depart from London Heathrow to destinations in the Middle East were cancelled on Sunday, according to data from Cirium. Some airlines issued waivers to travellers that will allow them to rebook their flight plans without paying extra fees or higher fares.

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