Blackpool recorded a sixth away win of the season at Leyton Orient and boosted their League One play-off hopes.
Orient had more chances in the first half with Justin Miller and Gary Alexander seeing their efforts cleared.
Blackpool went closest to taking the lead midway through the second half when Andy Morrell headed Shaun Barker's cross over the bar.
Orient had late chances too but Keith Southern snatched it for Blackpool, scoring in the 85th minute.
Leyton Orient: Garner, Miller, Lockwood, Saah, Thelwell, Tudor, Corden, Easton, Chambers, Alexander, Ibehre (Walker 83).
Subs Not Used: Morris, Barnard, Tann, Demetriou.
Blackpool: Evans, Barker, Gorkss, Jackson, Evatt, Forbes, Hoolahan (Jorgensen 88), Fox, Southern, Vernon (Parker 64), Morrell (Burgess 79).
Subs Not Used: Tierney, Bean.
Goals: Southern 85.
Referee: R Lewis (Shropshire).