BERLIN- Qatar Airways will report a "very large loss" because of a regional political dispute that has slapped restrictions on the airline, its chief executive said on Wednesday.

The major Gulf airline lost access to 18 cities in Saudi Arabia, the United Arab Emirates (UAE), Egypt, and Bahrain last June when those four countries cut ties with Qatar after accusing it of supporting terrorism. Qatar denies the charges.

The restrictions, which include a ban on using airspace over the four countries, is "putting financial strain" on Qatar Airways, Chief Executive Akbar al-Baker told reporters at the ITB travel fair in Berlin.

"We will announce a very large loss during the current financial year which ends this month," he said, without giving further details.

Baker has previously warned that Qatar Airways would make a loss but had declined to disclose how significant it would be.

Qatar Airways made 1.97 billion Qatari riyals ($541 million) profit in its previous fiscal year.

Saudi Arabia and the UAE were popular routes for Qatar Airways. The airspace ban means that for many flights to the west and south of the Gulf the airline has to fly longer routes around the four countries which requires more fuel and increases costs.

The political dispute with its neighbours remains unresolved despite efforts by fellow Gulf state Kuwait as well as the United States to mediate.

The government of Qatar agreed in January that Qatar Airways would release detailed financial information to the U.S. government as part of a response to accusations by U.S. airlines that the carrier had been illegally state-subsidized.

Qatar Airways has denied the allegations and Baker has said the release of the data would have no impact on the airline.

(Writing by Alexander Cornwell, editing by Elaine Hardcastle)