Budapest BUD to Sofia SOF flight with Ryanair

Lufthansa is Germany’s largest airline and one of the leading carriers in Europe, connecting travelers to destinations worldwide from its main hubs in Frankfurt and Munich. Its modern fleet offers a wide choice of travel experiences, from Economy Class with affordable fares and onboard entertainment to Premium Economy, Business Class, and First Class with extra comfort, fine dining, and exclusive lounge access.

Austrian Airlines is the flag carrier of Austria and a member of the Lufthansa Group, offering flights across Europe and to long-haul destinations in Asia, North America, and beyond. Operating primarily from Vienna International Airport, Austrian combines efficiency with warm hospitality. Economy Class passengers enjoy comfort, onboard entertainment, and meals, while Business Class offers spacious seating, fine dining inspired by Austrian cuisine, and lounge access. With a reputation for quality service and reliable connections, Austrian Airlines is a trusted choice for travelers worldwide

Lufthansa CityLine is a German regional airline and a wholly-owned subsidiary of Deutsche Lufthansa AG, operating as part of the Lufthansa Regional concept. Headquartered at Munich Airport, with hubs also at Frankfurt Airport, it operates a dense domestic and European network on behalf of its parent company. The airline primarily uses regional jets like the Bombardier CRJ900, along with Airbus A319s and A320neos, to connect smaller European cities to Lufthansa's major hubs. Lufthansa CityLine is known for its reliability in providing feeder traffic to Frankfurt and Munich.

Air Serbia is the national flag carrier of Serbia, with its main hub at Belgrade Nikola Tesla Airport. The airline's origins trace back to Aeroput, established in 1927, making it one of the oldest airlines in Europe. Rebranded as Air Serbia in 2013 after a partnership with Etihad Airways, the airline has since modernized its fleet and expanded its network. Air Serbia operates scheduled, seasonal, and charter flights to over 90 destinations across Europe, the Mediterranean, North America, Asia, and Africa. They offer both passenger and cargo services, and in cooperation with partner airlines, extend their reach to international destinations in Asia, Australia, North America, and Africa. The airline is a member of the International Air Transport Association (IATA).

LOT Polish Airlines, legally Polskie Linie Lotnicze LOT S.A., is the flag carrier of Poland and one of the world's oldest airlines, founded in 1928. It is a founding member of IATA and joined the Star Alliance in 2003. With its main hub at Warsaw Chopin Airport, LOT serves over 97 destinations across Europe, Asia, and North America with a fleet of 87 aircraft as of June 2025. The airline is recognized for operating one of Europe's youngest fleets and was the first European operator of the Boeing 787 Dreamliner.

Norwegian Air International (NAI) was an Irish airline and a fully integrated subsidiary of Norwegian Air Shuttle, operating under its corporate identity. Headquartered at Dublin Airport, NAI operated flights to destinations across Europe and the Middle East from various European bases. Between 2017 and 2019, it also offered services from Europe to the United States and Canada. NAI received its operating license and air operator's certificate from Ireland in February 2014, allowing it to leverage European Union airline freedoms. By April 2021, its aircraft and operations were gradually transferred to its Swedish sister airline, Norwegian Air Sweden, and its parent company.

AirBaltic is the flag carrier of Latvia and a leading hybrid airline in the Baltics, combining aspects of traditional network and low-cost carriers. Founded in 1995, it operates a modern fleet of Airbus A220-300 aircraft, connecting the Baltics from hubs in Riga, Tallinn, Vilnius, and Tampere to over 70 destinations across Europe, the Middle East, North Africa, and the Caucasus. The company is majority-owned by the Latvian state. AirBaltic is recognized for its commitment to passenger experience, having received awards for cabin service and being among the world's safest airlines. In a pioneering move, AirBaltic became the first European airline to offer free high-speed SpaceX Starlink internet on its flights in February 2025.

Ryanair is one of Europe’s largest and most popular low-cost airlines, headquartered in Ireland. It offers affordable flights to destinations across the continent, often operating to smaller or secondary airports outside major cities to keep fares low. All Ryanair tickets include an allowance for one small personal bag, with additional fees for cabin baggage and checked luggage. Known for its extensive network and budget-friendly fares, Ryanair makes it easy to travel quickly and affordably to popular European destinations.