Drew Brees had the highest completion percentage by a quarterback with more than 20 passing attempts in 2018, at 74.4 percent.

what was the highest completion percentage by a qb with more than 20 attempts in the 2018 nfl season
Interpreted as:
What was the highest completion percentage by a qb with more than 20 passing attempts in the 2018 NFL season?
2018Brees2018Foles2018Glennon2018Cousins2018Daniel2018Wentz2018Ryan2018Carr2018Mariota2018Watson2018Rivers2018Newton2018Prescott2018Luck2018Roethlisberger2018Fitzpatrick2018Trubisky2018Stafford2018Mahomes2018Manning2018Brady2018Wilson2018Kessler74.472.371.470.169.769.669.468.968.968.368.367.967.767.367.066.766.666.166.066.065.865.664.9
NAMESEASONTMGPPCTATTCMPYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Drew BreesDrew Brees2018NONO1574.44893643,9928.2266.1326.551.017121115.7
Nick FolesNick Foles2018PHIPHI572.31951411,4137.2282.673.642.194796.0
Mike GlennonMike Glennon2018ARIARI271.421151748.387.014.800.018112.0
Kirk CousinsKirk Cousins2018MINMIN1670.16064254,2987.1268.6305.0101.74026299.7
Chase DanielChase Daniel2018CHICHI569.776535156.8103.033.922.694090.6
Carson WentzCarson Wentz2018PHIPHI1169.64012793,0747.7279.5215.271.731202102.2
Matt RyanMatt Ryan2018ATLATL1669.46084224,9248.1307.8355.871.242296108.1
Derek CarrDerek Carr2018OAKOAK1668.95533814,0497.3253.1193.4101.85129993.9
Marcus MariotaMarcus Mariota2018TENTEN1468.93312282,5287.6180.6113.382.44224392.3
Deshaun WatsonDeshaun Watson2018HOUHOU1668.35053454,1658.2260.3265.191.862384103.1
Philip RiversPhilip Rivers2018LACLAC1668.35083474,3088.5269.3326.3122.432204105.5
Cam NewtonCam Newton2018CARCAR1467.94713203,3957.2242.5245.1132.82921394.2
Dak PrescottDak Prescott2018DALDAL1667.75263563,8857.4242.8224.281.55634796.9
Andrew LuckAndrew Luck2018INDIND1667.36394304,5937.2287.1396.1152.31813498.7
Ben RoethlisbergerBen Roethlisberger2018PITPIT1667.06754525,1297.6320.6345.0162.42416696.5
Ryan FitzpatrickRyan Fitzpatrick2018TBTB866.72461642,3669.6295.8176.9124.91476100.4
Mitchell TrubiskyMitchell Trubisky2018CHICHI1466.64342893,2237.4230.2245.5122.82414395.4
Matthew StaffordMatthew Stafford2018DETDET1666.15553673,7776.8236.1213.8112.04025589.9
Patrick MahomesPatrick Mahomes2018KCKC1666.05803835,0978.8318.6508.6122.126171113.8
Eli ManningEli Manning2018NYGNYG1666.05763804,2997.5268.7213.6111.94735892.4
Tom BradyTom Brady2018NENE1665.85703754,3557.6272.2295.1111.92114797.7
Russell WilsonRussell Wilson2018SEASEA1665.64272803,4488.1215.5358.271.651355110.9
Cody KesslerCody Kessler2018JAXJAX564.9131857095.4141.821.521.52214977.4
Jared GoffJared Goff2018LARLAR1664.95613644,6888.4293.0325.7122.133223101.1
Jameis WinstonJameis Winston2018TBTB1164.63782442,9927.9272.0195.0143.72715790.2
StatMuse has season-level data for completion percentage and passing attempts going back to the 1932 season.

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