From Programming Insider (see end of article for link)
Live +7 Day Ratings
18-49
L+SD - 0.41
L+7D - 0.81
Total Increase 0.40
Percent Increase - +96%
Total Viewers
L+SD - 1.391M
L+7D - 2.325M
Total Increase - 0.934M
Percent Increase - +67.15%
Live + 3 Day Ratings
18-49
L+SD - 0.41
L+3D - 0.71
Total Increase - 0.30
Percent Increase - +71%
L+3D - 0.71
Total Increase - 0.30
Percent Increase - +71%
Total Viewers
L+SD - 1.391M
L+3D - 2.077M
Total Increase - 0.686
Percent Increase - +49.32%
L+3D - 2.077M
Total Increase - 0.686
Percent Increase - +49.32%
Final Ratings from Spoiler TV
18-49 - 0.4
Final Ratings - 1.39
Final Ratings - 1.39
Overnight ratings for Supernatural season 13 episode 21.
From Showbuzz Daily

Change from last week via TV Series Finale

Live+7 Weekly #Ratings: ‘#TheOriginals’ on CW More Than Doubles its Live Plus Same Day Figures in Delayed Viewing https://t.co/JUElSkwK0C pic.twitter.com/GFFxSHxfzo
— Douglas Pucci (@SonOfTheBronx) May 16, 2018
Live+3 Weekly Ratings: 'Brockmire', 'Siren', 'The Royals' and 'Krypton' Lead TV's Best Percentage Boosts Among Adults 18-49 https://t.co/wEjP9FdX8F - Programming Insider https://t.co/wEjP9FdX8F
— Programming Insider (@PIUpdate) May 11, 2018