Gary Madine's first-half penalty lifted Blackpool into the top half of the Championship table as they saw off Hull at Bloomfield Road.
Madine rifled home from the spot after Josh Bowler had been felled in the box - and it proved enough to seal victory for the Seasiders.
However, they were indebted to goalkeeper Dan Grimshaw, who made two key saves late on to deny Hull a point.
The Tigers stay in 19th place, while Blackpool climb above Sheffield United to 12th.
Blackpool began brightly, with the lively Bowler and Keshi Anderson causing problems for the Tigers defence.