Ben Roethlisberger has the best completion percentage by a quarterback in a game with 20+ completions against the Cowboys, at 84.0 percent on October 17, 2004.

highest completion percentage in a game vs cowboys by quarterback with at least 20 completions
Interpreted as:
highest completion percentage in a regular-season game vs cowboys by quarterback with at least 20 completions
10/17/2004Roethlisberger10/27/2014McCoy9/29/2013Rivers10/29/2000Brunell11/10/2013Brees9/29/1991Hostetler11/23/2017Rivers10/4/2015Brees11/13/2016Roethlisberger9/30/2018Stafford11/7/2010Rodgers10/24/2004Favre10/6/2013Manning12/22/2019Wentz11/24/2016Cousins9/29/2019Bridgewater9/10/2017Manning11/17/2002Manning11/12/2017Ryan12/13/2020Allen10/7/2018Watson9/16/2018Manning12/9/2013McCown84.083.383.383.382.982.481.880.580.480.079.479.378.677.577.476.776.376.375.975.075.075.075.0
NAMEDATETMOPPPCTCMPATTYDSAVGTDTD%INTINT%SCKSCKYRATE
Ben RoethlisbergerBen Roethlisberger10/17/2004PITPIT@ DAL
@
84.021251937.728.000.0321125.5
Colt McCoyColt McCoy10/27/2014WASWAS@ DAL
@
83.3253029910.000.013.331394.3
Philip RiversPhilip Rivers9/29/2013SDSDvs. DAL
vs.
83.335424019.537.112.417120.3
Mark BrunellMark Brunell10/29/2000JAXJAX@ DAL
@
83.320242319.6312.500.000146.4
Drew BreesDrew Brees11/10/2013NONOvs. DAL
vs.
82.934413929.649.800.019139.0
Jeff HostetlerJeff Hostetler9/29/1991NYGNYG@ DAL
@
82.4283436810.812.912.900109.3
Philip RiversPhilip Rivers11/23/2017LACLAC@ DAL
@
81.8273343413.239.100.000149.1
Drew BreesDrew Brees10/4/2015NONOvs. DAL
vs.
80.533413598.824.900.0324119.4
Ben RoethlisbergerBen Roethlisberger11/13/2016PITPITvs. DAL
vs.
80.437464088.936.500.018125.4
Matthew StaffordMatthew Stafford9/30/2018DETDET@ DAL
@
80.0243030710.226.700.0321131.5
Aaron RodgersAaron Rodgers11/7/2010GBGBvs. DAL
vs.
79.427342898.538.800.0112131.5
Brett FavreBrett Favre10/24/2004GBGBvs. DAL
vs.
79.323292588.926.900.016126.7
Peyton ManningPeyton Manning10/6/2013DENDEN@ DAL
@
78.633424149.949.512.400129.6
Carson WentzCarson Wentz12/22/2019PHIPHIvs. DAL
vs.
77.531403198.012.500.016108.2
Kirk CousinsKirk Cousins11/24/2016WASWAS@ DAL
@
77.441534498.535.700.000120.7
Teddy BridgewaterTeddy Bridgewater9/29/2019NONOvs. DAL
vs.
76.723301936.400.013.354478.9
Eli ManningEli Manning9/10/2017NYGNYG@ DAL
@
76.329382205.800.012.632278.8
Peyton ManningPeyton Manning11/17/2002INDINDvs. DAL
vs.
76.329382526.625.312.60099.9
Matt RyanMatt Ryan11/12/2017ATLATLvs. DAL
vs.
75.922292157.426.913.4111104.8
Brandon AllenBrandon Allen12/13/2020CINCINvs. DAL
vs.
75.027362176.012.800.00099.0
Deshaun WatsonDeshaun Watson10/7/2018HOUHOUvs. DAL
vs.
75.033443758.512.312.31198.2
Eli ManningEli Manning9/16/2018NYGNYG@ DAL
@
75.033442796.312.300.065998.6
Josh McCownJosh McCown12/9/2013CHICHIvs. DAL
vs.
75.027363489.7411.100.017141.9
Michael VickMichael Vick10/30/2011PHIPHIvs. DAL
vs.
75.0212827910.027.100.0423129.9
Peyton ManningPeyton Manning12/5/2010INDINDvs. DAL
vs.
75.036483657.624.248.30075.4
Results may be incomplete. StatMuse has complete game-level data for completion percentage and completions going back to the 1950 season.

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