The episode had 17.1% of the audience share and was the 9th most watched programme of the day.
The programme faced strong opposition from Billy Connolly's Route 66, which had 5.4 million watching and which won the timeslot.
Final ratings, which include those who record the programme and watch it within seven days,will be released next week.
The broadcast of the episode on Starz on 9th September achieved a total of 950,000 viewers over its premiere evening, with 640,000 watching at 10:00pm and 310,000 for the 11:00pm repeat.
With the figures of the finale in the United States now in, here is a round-up of how Miracle Day has fared over its ten week run thus far:
Starz Premiere UK Overnight UK Final BARB The New World 1.506m * 4.8m 6.59m Rendition 1.4m ** 4.4m 5.75m Dead of Night 1.018m 4.2m 5.49m Escape to L.A. 0.935m 4.0m 5.19m The Categories of Life 1.024m 4.1m 5.17m The Middle Men 0.804m 3.4m 4.60m Immortal Sins 0.917m 3.4m 4.48m End of the Road 1.172m 3.5m 4.64m The Gathering 1.024m 3.5m (due 19 Sep) The Blood Line 0.950m 3.9m (due 26 Sep) * - Starz reported 2.7m viewers for the full week/Live+3 DVR data ** - This is a weekend figure, with 609,000 viewers for the 10:00pm broadcast