TUIfly Belgium, legally incorporated as TUI Airlines Belgium NV and formerly branded Jetairfly until October 2016, is a Belgian airline headquartered in Ostend with its largest base at Brussels Airport.

The airline adopted its trading names Jetairfly in November 2005 and TUIfly Belgium in October 2016. It is a subsdiary of the TUI Group and part of the TUI Airlines. TUI Airlines also incorporates the sister companies TUI Airlines Netherlands (The Netherlands), Corsair International (France), TUIfly (Germany), Thomson Airways (United Kingdom) and TUIfly Nordic (Sweden).

The airline was created in November 2003 as home carrier for tour operator Jetair, part of tourism group TUI AG. The original plans were to operate two aircraft, but after charter company Sobelair (home carrier for Jetair) ceased its operations, Jetairfly started its operations with 5 aircraft. On 23 November 2005, The airline was rebranded Jetairfly as part of the rebranding around Belgium's number 1 tourism brand Jetair.

In January 2012 Jetairfly announced that Jet4you, a low-cost Moroccan carrier and also a subsidiary of the TUI AG Group, would be fully integrated in Jetairfly. The merger was complete in April 2012. In March 2012 Jetairfly officially became a full scheduled airline, while previously a part of their flights were conducted as charter flights. As a result, all flights can be booked in both directions even by non-EU citizens.

In the beginning of 2013, Jetairly was the first leisure airline worldwide to introduce the Embraer E-Jet 190 in its fleet. In the autumn of 2013, the new office building and maintenance hangar "Jetairport" was inaugurated at Brussels Airport. In December 2013, Jetairfly was the first and only Belgian airline to introduce the brand new Boeing 787-8 "Dreamliner".

On 14 November 2014 Jetairfly sealed a wet-lease deal to provide up to four aircraft with crew to operate on behalf of ECAir, the flag carrier of the Republic of the Congo, from mid 2015 on.

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