It operates scheduled domestic, regional and long-haul flights from its two bases at Gimpo and Incheon.

[3] T'Way's predecessor, Hansung Airlines (한성항공), first obtained an air operator's certificate (AOC) in April 2005[4] and received its first aircraft, an ATR 72 for its inaugural domestic services between Cheongju and Jeju shortly after.

[5][6] Hansung Airlines had planned to expand to international routes and subsequently ordered 20 ATR 72-500 aircraft.

[16][17] In October 2022, T'way announced a route from Seoul to Sydney, which is its first long-haul connection.

[18] In October 2024, the airline inaugurated flights to Germany with a route between Seoul and Frankfurt, which it had been granted due to a concession deal as part of the merger between Korean Air and Asiana Airlines, which both serve Frankfurt.