Drew Brees has the highest completion percentage by a quarterback in a season, at 74.4 percent in 2018.

nfl which qb has the highest completion% for a season
Interpreted as:
NFL which qb has the highest completion% with a minimum of 14 passing attempts per team game for a season
2018Brees2019Brees2017Brees2016Bradford2011Brees2020Rodgers2009Brees1982Anderson2020Brees2019Carr1945Baugh1994Young2019Tannehill2020Watson1989Montana2018Cousins2016Brees2014Romo2016Ryan2015Cousins2018Wentz2013Rivers2018Ryan74.474.372.071.671.270.770.670.670.570.470.370.370.370.270.270.170.069.969.969.869.669.569.4
NAMESEASONTMGPPCTCMPATTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Drew BreesDrew Brees2018NONO1574.43644893,9928.2266.1326.551.017121115.7
Drew BreesDrew Brees2019NONO1174.32813782,9797.9270.8277.141.11289116.3
Drew BreesDrew Brees2017NONO1672.03865364,3348.1270.9234.381.520145103.9
Sam BradfordSam Bradford2016MINMIN1571.63955523,8777.0258.5203.650.93727699.3
Drew BreesDrew Brees2011NONO1671.24686575,4768.3342.3467.0142.124158110.6
Aaron RodgersAaron Rodgers2020GBGB1670.73725264,2998.2268.7489.151.020182121.5
Drew BreesDrew Brees2009NONO1570.63635144,3888.5292.5346.6112.120135109.6
Ken AndersonKen Anderson1982CINCIN970.62183092,4958.1277.2123.992.92615495.3
Drew BreesDrew Brees2020NONO1270.52753902,9427.5245.2246.261.51389106.4
Derek CarrDerek Carr2019OAKOAK1670.43615134,0547.9253.4214.181.629184100.8
Sammy BaughSammy Baugh1945WASWAS870.31281821,6699.2208.6116.042.2109.9
Steve YoungSteve Young1994SFSF1670.33244613,9698.6248.1357.6102.231163112.8
Ryan TannehillRyan Tannehill2019TENTEN1270.32012862,7429.6228.5227.762.131212117.5
Deshaun WatsonDeshaun Watson2020HOUHOU1670.23825444,8238.9301.4336.171.349293112.4
Joe MontanaJoe Montana1989SFSF1370.22713863,5219.1270.8266.782.133198112.4
Kirk CousinsKirk Cousins2018MINMIN1670.14256064,2987.1268.6305.0101.74026299.7
Drew BreesDrew Brees2016NONO1670.04716735,2087.7325.5375.5152.227184101.7
Tony RomoTony Romo2014DALDAL1569.93044353,7058.5247.0347.892.129215113.2
Matt RyanMatt Ryan2016ATLATL1669.93735344,9449.3309.0387.171.337235117.1
Kirk CousinsKirk Cousins2015WASWAS1669.83795434,1667.7260.4295.3112.026186101.6
Carson WentzCarson Wentz2018PHIPHI1169.62794013,0747.7279.5215.271.731202102.2
Philip RiversPhilip Rivers2013SDSD1669.53785444,4788.2279.9325.9112.030150105.5
Matt RyanMatt Ryan2018ATLATL1669.44226084,9248.1307.8355.871.242296108.1
Brian GrieseBrian Griese2004TBTB1169.32333362,6327.8239.3206.0123.62616997.5
Josh AllenJosh Allen2020BUFBUF1669.23965724,5447.9284.0376.5101.726159107.2
StatMuse has season-level data for completion percentage and pass attempts per team game going back to the 1932 season.

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