List of Airlines beginning with U
- USA3000 Airlines
- United Arabian Airlines
- United Airlines
- United Air Charters
- United Carriers Systems
- United Eagle Airlines
- United Feeder Service
- United Kingdom Civil Aviation Authority
- United Kingdom Royal VIP Flights
- United States Coast Guard Auxiliary
- United States Department Of Agriculture
- University Air Squadron
- Universal Avia
- UK HEMS
- USA Jet Airlines
- Unijet
- US Marshals Service
- University of North Dakota
- Universal Airlines
- Uganda Royal Airways
- United Aviation Services
- Ural Airlines
- Ukraine Transavia
- United Arab Emirates Air Force
- Union Africaine des Transports
- Uganda Air Cargo
- US Airports Air Charter
- Ucoaviacion
- Ues-Avia Aircompany
- Uganda Airlines
- Urgemer Canarias
- Ukrainian Helicopters
- Ulyanovsk Higher Civil Aviation School
- Universal Jet Rental de Mexico
- Universal Jet Aviation
- UK International Airlines
- Ukraine Air Alliance
- UM Airlines
- Ukraine Air Enterprise
- United Kingdom Home Office
- Ukrainian Cargo Airways
- Ultrair
- Unitemp-M