The airline was established in 1934 by Viggo Widerøe, a notable Norwegian aviator, and was engaged in various general aviation activities in its early days. In 1936, Widerøe started scheduled seaplane flights and, from 1940, also ambulance flights. During the 1940s and 1950s, the airline increased its seaplane routes and established a fleet based on de Havilland Canada DHC-3 Otter and Noorduyn Norseman aircraft. From 1968, Widerøe started flying to STOLports in northern and western Norway using DHC-6 Twin Otters, and later also with Dash 7 aircraft. In 1989, Widerøe bought Norsk Air and started services from Sandefjord. During the 1990s, it replaced all its aircraft with Dash 8 aircraft; in the 2000s it was bought by the SAS Group and took over SAS Commuter's operations in northern Norway. In 2010, Widerøe took over regional SAS services in western Norway. In 2013, SAS Group sold 80% of the shares to WF Holding, an investment company controlled by Torghatten ASA, and in June 2016 the remaining 20% of the shares were transferred to WF Holding, ending SAS ownership of Widerøe, albeit still as a close regional partner of SAS.