The group chronicle their rise to fame and success in the clip for 'Beautiful World', which is one of the new tracks included on their recent Greatest Hits compilation.
The promo sees the boyband behind the scenes of the video for their debut single 'Swear It All Over Again', right up to them filming in South Africa for their previous cut 'Lighthouse'.
Former member Brian McFadden is included in the footage, which also sees a cameo from the band's manager Louis Walsh.
Westlife recently revealed that record bosses offered them more money to stay together, but they felt they needed to depart and "see what else is out there".
The Irish pop act will embark on their farewell tour across the UK and Ireland next summer and have added a collection of new dates to meet ticket demands.
> Westlife: 'Louis Walsh leaked ridiculous stories about us'
Watch the music video for Westlife's 'Beautiful World' below: