Brett Favre has the best completion percentage by a quarterback in a game with 20+ completions against the Seahawks, at 88.0 percent on November 22, 2009.

highest completion percentage by quarterback with at least 20 completions in a game vs seahawks
Interpreted as:
highest completion percentage by quarterback with at least 20 completions in a regular-season game vs seahawks
11/22/2009Favre11/14/1976Tarkenton11/25/2018Newton11/8/2020Allen11/2/1986O'Brien12/26/2010Freeman12/23/2000Flutie10/14/1979Fouts10/18/2009Warner9/27/2009Cutler11/13/1983Lomax10/9/1983Fouts10/7/1979DeBerg10/30/2016Brees11/9/1987O'Brien11/24/2002Green11/15/2009Warner12/26/1982Anderson9/20/2015Rodgers9/14/2014Rivers10/4/2009Manning10/27/2019Schaub11/27/2016Winston88.083.983.381.681.380.880.080.078.077.877.877.877.577.176.776.576.375.975.875.775.675.075.0
NAMEDATETMOPPPCTCMPATTYDSAVGTDTD%INTINT%SCKSCKYRATE
Brett FavreBrett Favre11/22/2009MINMINvs. SEA
vs.
88.022252138.5416.000.0219141.8
Fran TarkentonFran Tarkenton11/14/1976MINMINvs. SEA
vs.
83.926312748.826.500.0125.0
Cam NewtonCam Newton11/25/2018CARCARvs. SEA
vs.
83.325302568.526.713.300110.6
Josh AllenJosh Allen11/8/2020BUFBUFvs. SEA
vs.
81.6313841510.937.900.0729138.5
Ken O'BrienKen O'Brien11/2/1986NYJNYJ@ SEA
@
81.3263243113.5412.500.0212158.3
Josh FreemanJosh Freeman12/26/2010TBTBvs. SEA
vs.
80.821262379.1519.200.0221144.2
Doug FlutieDoug Flutie12/23/2000BUFBUF@ SEA
@
80.0202536614.6312.000.000158.3
Dan FoutsDan Fouts10/14/1979SDSDvs. SEA
vs.
80.028353189.138.600.0133.1
Kurt WarnerKurt Warner10/18/2009ARIARI@ SEA
@
78.032412766.724.912.4210100.8
Jay CutlerJay Cutler9/27/2009CHICHI@ SEA
@
77.821272479.1311.113.7214126.4
Neil LomaxNeil Lomax11/13/1983STLSTLvs. SEA
vs.
77.821272539.4414.800.0322145.3
Dan FoutsDan Fouts10/9/1983SDSDvs. SEA
vs.
77.828363319.212.825.632291.1
Steve DeBergSteve DeBerg10/7/1979SFSFvs. SEA
vs.
77.531403067.712.512.596.5
Drew BreesDrew Brees10/30/2016NONOvs. SEA
vs.
77.127352657.612.900.0213107.4
Ken O'BrienKen O'Brien11/9/1987NYJNYJvs. SEA
vs.
76.723302267.513.300.0216108.5
Trent GreenTrent Green11/24/2002KCKC@ SEA
@
76.5263434310.125.912.928115.2
Kurt WarnerKurt Warner11/15/2009ARIARIvs. SEA
vs.
76.329383408.925.300.000120.5
Ken AndersonKen Anderson12/26/1982CINCINvs. SEA
vs.
75.922292659.113.426.92986.1
Aaron RodgersAaron Rodgers9/20/2015GBGBvs. SEA
vs.
75.825332497.526.100.0215116.9
Philip RiversPhilip Rivers9/14/2014SDSDvs. SEA
vs.
75.728372847.738.100.018124.2
Peyton ManningPeyton Manning10/4/2009INDINDvs. SEA
vs.
75.631413538.624.912.400107.1
Matt SchaubMatt Schaub10/27/2019ATLATLvs. SEA
vs.
75.039524608.811.911.921999.8
Jameis WinstonJameis Winston11/27/2016TBTBvs. SEA
vs.
75.021282207.927.113.600106.3
Jeff GarciaJeff Garcia10/19/2008TBTBvs. SEA
vs.
75.027363108.612.800.015109.7
John ElwayJohn Elway9/23/1990DENDENvs. SEA
vs.
75.030402977.437.500.0216120.5
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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