<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="3"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Network </Th> <Th> Rank </Th> <Th> Average viewership ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 20 </Td> <Td colspan="1"> October 26 , 2015 ( 2015 - 10 - 26 ) </Td> <Td> April 18 , 2016 ( 2016 - 04 - 18 ) </Td> <Td> CBS </Td> <Td> 39 </Td> <Td> 9.81 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 22 </Td> <Td colspan="1"> October 10 , 2016 ( 2016 - 10 - 10 ) </Td> <Td> May 22 , 2017 ( 2017 - 05 - 22 ) </Td> <Td> The CW </Td> <Td> 129 </Td> <Td> 3.12 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 9 , 2017 ( 2017 - 10 - 09 ) </Td> <Td> June 18 , 2018 ( 2018 - 06 - 18 ) </Td> <Td> 154 </Td> <Td> 2.82 </Td> </Tr> </Table>
<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="3"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Network </Th> <Th> Rank </Th> <Th> Average viewership ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 20 </Td> <Td colspan="1"> October 26 , 2015 ( 2015 - 10 - 26 ) </Td> <Td> April 18 , 2016 ( 2016 - 04 - 18 ) </Td> <Td> CBS </Td> <Td> 39 </Td> <Td> 9.81 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 22 </Td> <Td colspan="1"> October 10 , 2016 ( 2016 - 10 - 10 ) </Td> <Td> May 22 , 2017 ( 2017 - 05 - 22 ) </Td> <Td> The CW </Td> <Td> 129 </Td> <Td> 3.12 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 9 , 2017 ( 2017 - 10 - 09 ) </Td> <Td> June 18 , 2018 ( 2018 - 06 - 18 ) </Td> <Td> 154 </Td> <Td> 2.82 </Td> </Tr> </Table>
when did season 3 of supergirl come out
when did season 3 of supergirl come out
October 9 , 2017
October 9 , 2017