Orion Airways (known simply as 'Orion') was an airline based in the United Kingdom with its head office on the grounds of East Midlands Airport in Castle Donington, North West Leicestershire. It was created as the charter airline of Horizon Travel and went on to successfully develop scheduled services. The airline operated a fleet of Boeing 737-200s, Boeing 737-300s and Airbus A300s between 1979-1989.

Horizon Travel created Orion in 1978 to support Horizon's package holiday business at a time when there was a shortage in capacity provided by charter airlines. Orion began operation with three Boeing 737-200s on 28 March 1980.

Over the next few years, Orion gradually expanded its fleet, operating 11 737-200s by the summer of 1984, and from 1985, beginning to replace them by more modern Boeing 737-300s. From 1984, the airline began to diversify, taking on charter work from other tour operators, while in 1986, Orion successfully gained permission to fly scheduled services from East Midlands Airport and Birmingham airport to various holiday destinations.

The airline quickly won a reputation for its quality of service, punctuality and distinctive look. The competition was fierce but Horizon’s destinations continued to increase, correlating with Orion’s increased route-network and fleet growth.

In 1987, the Horizon group, including Orion was bought by Bass the large brewing and hotels group. As a successful holiday tour operator and integrated airline it was an appealing, tidy, and importantly a 'no-strings' package ripe for sale to a competitor. In 1988, Bass accepted an offer from the ever-expanding Thomson Travel Group. When the news was released that Orion was to be integrated into Britannia during 1989, it came as a surprise to the industry and public alike. The last flight took place on 26 January 1989 and it was not long before the familiar livery and titles disappeared from aircraft and buildings at East Midlands Airport because the new owner understandably intended to concentrate its activities at its Luton Airport base. Naturally the scheduled licenses were transferred to Britannia without interruption, but at the end of the 1990 summer season, the airline decided to withdraw from this market in favour of its charter work. Ironically, in 2005, TUI UK (owner of Thomson Travel Group) made big expansion plans into the scheduled market.

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