The Posh initially took the lead through Hector Kyprianou’s first half header, before Shayne Lavery levelled the scores from the penalty spot, ahead of the eventual decider in the 89th minute.
Seasiders supporters have endured their fair share of disappointment in recent weeks, but were given a day out to remember on Saturday afternoon.
Here’s some of the best fan photos:
1. Blackpool fans
Seasiders supporters made the trip to Peterborough. Photo: CameraSport - Andrew Kearns
2. Blackpool fans
Seasiders supporters made the trip to Peterborough. Photo: CameraSport - Andrew Kearns
3. Full time celebrations
The Blackpool players enjoyed the victory in front of the travelling supporters. Photo: CameraSport - Andrew Kearns
4. Blackpool fans
Seasiders supporters made the trip to Peterborough. Photo: CameraSport - Andrew Kearns
5. Blackpool fans
Seasiders supporters made the trip to Peterborough. Photo: CameraSport - Andrew Kearns
6. Blackpool fans
Seasiders supporters made the trip to Peterborough. Photo: CameraSport - Andrew Kearns