The ASA found "insufficient evidence" that this advertised price was genuinely available across a range of flight routes and dates.
The airline is now banned from using the phrase in marketing communications and must ensure future "from" prices reflect the lowest price accessible across a significant proportion of flights.
A Which? investigation supported the ruling, revealing that the actual price for a large cabin bag was significantly higher, with the lowest found being £23.49 and the average £30.
EasyJet stated it always aims to provide clear pricing and has made changes to its page following the ASA's feedback to ensure information is as clear as possible for consumers.