DJ Campbell enhanced his prospects of earning a move to Blackpool and landing Tony Parkes the manager's job permanently with the winner at Swansea.
The on-loan Leicester striker struck on 13 minutes, finishing calmly into the bottom corner when Brett Ormerod squared the ball across the Swans area.
Thomas Butler worked Blackpool keeper Paul Rachubka twice early on.
Jordi Gomez also went close while Rachubka had to save at the feet of Swansea top scorer Jason Scotland.
Swansea manager Roberto Martinez: "Ending the season with a top-eight in the table has been a huge achievement.
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"But there are many things we can learn from today's performance.
"We're looking to improve the squad for next season and I was delighted with certain things, but not too pleased with others."
Blackpool caretaker manager Tony Parkes: "Success for Blackpool is staying in this division and we have done that quite comfortably.
"We have finished on a good note with only one defeat in our last 10 matches.
"There is a board meeting in a couple of weeks when my position will be discussed, but I would definitely like the job."
Swansea: De Vries, Williams, Tate, Bessone (Gower 83), Serran, Britton (Allen 46), Orlandi, Gomez, MacDonald (Pintado 60), Butler, Scotland. Subs Not Used: O'Leary, Collins.
Booked: Tate.
Blackpool: Rachubka, Baptiste, Crainey, Barker, Coid, Southern, Adam, Vaughan, O'Donovan (Small 90), Ormerod (Jorgensen 86), Campbell. Subs Not Used: Gilks, Burgess, Walton.
Booked: Ormerod.
Goals: Campbell 13.
Att: 16,316
Ref: Carl Boyeson (E Yorkshire).
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