The collapse of Adria Airways has cost Slovenia connections to dozens of international markets, a study has revealed.

The national airline filed for bankruptcy and cancelled all flights on Monday.

Adria had previously withdrawn virtually all its flights last week.

“Bankruptcy proceedings were initiated by the management of the company because of the company’s insolvency,” the carrier said in a statement.

A study by ForwardKeys, the travel analytics firm, revealed that the bankruptcy resulted in the loss of direct flight connections with two dozen countries, including Czech Republic, Spain and Switzerland, all important origin markets for the country.

Adria has accounted for 60 per cent of all international seat capacity to Slovenia.

Other key source markets such as Austria, Germany and France will also be impacted, as Adria Airways accounted for 99 per cent, 87 per cent and 51 per cent of seat capacity on flights from these countries.

The full list of countries, which had direct connections to Slovenia in the past 12 months and have now lost them, comprises: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Egypt, Estonia, Georgia, Greece, Hungary, Iceland, Ireland, Italy, Jordan, Latvia, Macedonia, Norway, Romania, Spain, Sweden, Switzerland and Ukraine.

However, the impact is less dramatic than the list suggests, because some of the routes, such as those from Estonia, Georgia and Greece are seasonal, and others, from Cyprus, Hungary, Italy, Jordan, Latvia, Romania and Ukraine are irregular.

Olivier Ponti, vice president, insights, ForwardKeys, said: “Given the attractiveness of Slovenia as a destination, I expect other airlines to fill the gaps left by Adria Airways but how long it will take to get back to the previous level is anyone´s guess.

“Slovenia, and its vibrant capital Ljubljana, remain accessible and well worth a visit; however, if you were counting on Adria Airways to get you there quickly, you must now allow more time.”