Season Episodes Originally aired Nielsen ratings First aired Last aired Viewers (millions) Viewers rank 18 -- 49 rating / share 18 - 49 rank 22 October 23, 2011 (2011 - 10 - 23) May 13, 2012 (2012 - 05 - 13) 11.71 28 4.1 / 10 18 22 September 30, 2012 (2012 - 09 - 30) May 12, 2013 (2013 - 05 - 12) 10.24 35 3.6 / 9 18 22 September 29, 2013 (2013 - 09 - 29) May 11, 2014 (2014 - 05 - 11) 9.38 35 3.3 / 8 12 22 September 28, 2014 (2014 - 09 - 28) May 10, 2015 (2015 - 05 - 10) 8.98 50 3.2 / 7 17 5 23 September 27, 2015 (2015 - 09 - 27) May 15, 2016 (2016 - 05 - 15) 6.32 69 2.2 / 7 34 6 22 September 25, 2016 (2016 - 09 - 25) May 14, 2017 (2017 - 05 - 14) 4.39 105 1.5 / 5 70 7 22 October 6, 2017 (2017 - 10 - 06) May 18, 2018 (2018 - 05 - 18) TBA TBA TBA TBA
how many season in once upon a time
7 7 7 7 7 7 7 7 7 7 7 7