[5] Langdon joined the Nine Network after completing her journalism degree, which included an internship with CBS in New York City.
Seeking more on-the-road experience, Langdon moved to Nine's Darwin newsroom and, in her first year in the Top End, won the David Marchbank Award for best new journalist.
[7] Alongside her round as political reporter for the Northern Territory, Langdon travelled to Mexico and East Timor covering stories for news and the Sunday program.
[9] In February 2009, Langdon was criticised for her reporting in Marysville, Victoria, which had been devastated by the Black Saturday bushfires, and where 34 people had died.
[16] In November 2022, Nine Network announced that Langdon was appointed as the host of A Current Affair, replacing Tracy Grimshaw from 2023, with her role on Today taken over by Sarah Abo.
[18] In her acceptance speech, Langdon acknowledged her late father-in-law Mike Willesee, the first presenter of A Current Affair.