- Austria
- Belgium
- Bosnia & Herzegovina
- Bulgaria
- Croatia
- Czech Republic
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Macedonia
- Malta
- Moldova
- Netherlands
- Norway
- Poland
- Portugal
- Romania
- Russia
- Slovak Republic
- Slovenia
- Spain
- Sweden
- Switzerland
- Ukraine
- United Kingdom
- Yugoslavia
Bulgaria
Sofia Airport
As a commercial enterprise, Sofia Airport performs several business activities in parallel with its main role as a designated airport operator.
Varna Airport
On 24 December 1919 the first mail-plane from Sofia to Varna landed here, but this airline was functional for only one month.