The season seven premiere, by comparison, averaged 16.1 million total viewers, including 10.1 million who watched on the linear channel and the rest coming from DVR and streaming.
That also beats the previous series high of 16.9 million multi-platform viewers for the season seven finale. However, the season seven finale drew 12.1 million linear viewers, meaning this season's premiere was down slightly in that measure.
Priyanka Chopra wishes 'good luck' to Sophie Turner aka 'Sansa Stark' for 'Game of Thrones' final season!
The last season premiered internationally on April 14. It will air in India on Star World on April 16.
In addition, HBO NOW saw a jump of approximately 50 per cent in viewing when compared to last season's finale and a 97 per cent increase when compared to the seventh season premiere. It also accounts for largest night of streaming activity ever for HBO.
The season eight premiere was also the most-tweeted episode in series history with more than five million tweets on Sunday alone.