BBC One's flagship spring dance contest grabbed a slot-winning 3.45m (18.1%) for its main performance show between 7.15pm and 8.20pm, before Matt Flint's victory was seen by 3.39m (16.9%) at 10pm.
Despite climbing over a million week-on-week, last night's So You Think You Can Dance's figure is nearly 2m below last year's final.
After premiering with 4.9m in March, the format struggled to top 3m for the majority of its run.
The National Lottery: Who Dares Wins entertained 4.61m (21.8%) at 8.15pm, then an episode of Casualty titled 'One Good Day' topped the night for BBC One with 4.76m (21.6%) at 9.15pm.
Meanwhile, a repeat screening of Ice Age: The Meltdown logged 3.06m (16%) between 7pm and 8.45pm (+1: 180k) for ITV1 . A Cube celebrity special was the channel's strongest performer, with 3.09m (14%) until 9.45pm.
Elsewhere, BBC Two picked up 2.18m (12.2%), 2.71m (13.4%) and 2.18m (9.8%) for Dad's Army (7pm), Trooping The Colour (7.30pm) and Have I Got A Bit More News For You (9pm), while screenings of Sahara and Camelot fetched 1.47m (7.6%) from 6.45pm (+1: 257k) and 2.24m (10.9%) at 10pm (+1: 299k).
Channel 5's evening got better as it went on: CSI: Crissom's Greatest mustered 813k (3.9%) at 8pm, CSI: NY had 1.05m (4.8%) at 9pm, and Law & Order: SVU drew 1.21m (6.8%) at 10pm.
Overall, BBC One topped primetime with 19.5%, way ahead of ITV1's 13.3% (+1: 0.8%). Not far behind ITV was BBC Two with 10.8% and Channel 4 with 9.4% (+1: 1.2%). Channel 5 averaged 4.7%.
BARB ratings data supplied by Attentional