PA reports that the viewing figures were over 2m up on those for the competition's semi-finals.
However, despite being the highest rated programme of the day, the show had almost 5m fewer viewers than the corresponding finale of ratings rival Britain's Got Talent.
The Voice UK has experienced a sharp decline in viewers over its 11-week run, rising to nearly 12m in its early audition stages before dropping to as low as 6.2m in recent weeks.
The falling ratings have led to rumours that all four judges will be replaced in the next series.
However, will.i.am has gone on the record to state that he would still love to be involved next year.
