Thomsonfly was a British airline, which had been known as Britannia Airways. Thomsonfly was the first stage of TUI AG's plans to expand its business within TUI UK prior to September 2007. After TUI UK merged with First Choice Holidays in September 2007, it became part of TUI Travel PLC. The new holiday company continued with both in-house airlines (Thomsonfly and First Choice Airways) through Winter 2007 and Summer 2008 until the two were merged on 1 November 2008 as Thomson Airways.

Thomsonfly was the largest charter airline in the world, and also operated scheduled services to 20 European cities. The airline had several bases including Birmingham, Bournemouth, Cardiff, Coventry, Glasgow, Liverpool, London Gatwick, Belfast, London Luton, Manchester, Newcastle and Doncaster-Sheffield.

Thomsonfly Limited held a United Kingdom Civil Aviation Authority Type A Operating Licence permitting it to carry passengers, cargo and mail on aircraft with 20 or more seats.

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