Peyton Manning has the highest completion percentage in a game with 15+ completions against the Oakland Raiders, at 89.3 percent on December 29, 2013.

highest completion% in a game vs raiders with at least 15 completions including playoffs
Interpreted as:
highest completion% by a player in a game vs raiders with at least 15 completions including playoffs
12/29/2013Manning10/31/2004Brees10/12/2008Brees9/23/2013Manning10/16/2016Smith12/9/2018Roethlisberger12/15/2013Smith9/24/2017Cousins9/7/2014Smith10/7/2018Rivers11/19/2017Brady11/5/2017Cutler10/20/2019Rodgers11/19/1995Aikman9/16/1990Krieg9/30/2012Manning10/8/2006Smith11/3/2013Foles9/8/2013Luck12/8/2019Tannehill10/19/1970Jurgensen12/26/2020Tagovailoa11/2/2008Ryan89.388.086.786.586.486.285.083.382.181.581.181.080.679.279.278.978.978.678.377.877.477.377.3
NAMEDATETMOPPPCTCMPATTYDSAVGTDTD%INTINT%SCKSCKYRATE
Peyton ManningPeyton Manning12/29/2013DENDEN@OAKOAK89.325282669.5414.300.019145.8
Drew BreesDrew Brees10/31/2004SDSDvsOAKOAK88.0222528111.2520.000.018153.1
Drew BreesDrew Brees10/12/2008NONOvsOAKOAK86.7263032010.7310.000.011144.4
Peyton ManningPeyton Manning9/23/2013DENDENvsOAKOAK86.5323737410.138.100.012135.8
Alex SmithAlex Smith10/16/2016KCKC@OAKOAK86.4192222410.200.000.011109.1
Ben RoethlisbergerBen Roethlisberger12/9/2018PITPIT@OAKOAK86.225292829.726.900.016130.2
Alex SmithAlex Smith12/15/2013KCKC@OAKOAK85.0172028714.4525.000.0212158.3
Kirk CousinsKirk Cousins9/24/2017WASWASvsOAKOAK83.3253036512.2310.000.019150.7
Geno SmithGeno Smith9/7/2014NYJNYJvsOAKOAK82.123282217.913.613.623196.6
Philip RiversPhilip Rivers10/7/2018LACLACvsOAKOAK81.5222733912.627.400.016143.4
Tom BradyTom Brady11/19/2017NENE@OAKOAK81.130373409.238.100.018132.0
Jay CutlerJay Cutler11/5/2017MIAMIAvsOAKOAK81.034423117.437.100.012121.3
Aaron RodgersAaron Rodgers10/20/2019GBGBvsOAKOAK80.6253142913.8516.100.018158.3
Troy AikmanTroy Aikman11/19/1995DALDAL@OAKOAK79.219242279.514.200.014120.0
Dave KriegDave Krieg9/16/1990SEASEAvsRAIRAI79.219242259.400.014.21388.4
Peyton ManningPeyton Manning9/30/2012DENDENvsOAKOAK78.930383388.937.900.000130.0
Alex SmithAlex Smith10/8/2006SFSFvsOAKOAK78.915191658.7315.815.300120.5
Nick FolesNick Foles11/3/2013PHIPHI@OAKOAK78.6222840614.5725.000.011158.3
Andrew LuckAndrew Luck9/8/2013INDINDvsOAKOAK78.318231787.728.700.0431127.9
Ryan TannehillRyan Tannehill12/8/2019TENTEN@OAKOAK77.8212739114.5311.113.700140.4
Sonny JurgensenSonny Jurgensen10/19/1970WASWAS@OAKOAK77.424312327.526.500.0119.3
Tua TagovailoaTua Tagovailoa12/26/2020MIAMIA@LVLV77.31722944.314.500.032399.4
Matt RyanMatt Ryan11/2/2008ATLATL@OAKOAK77.3172222010.029.100.0319138.4
Tarvaris JacksonTarvaris Jackson11/18/2007MINMINvsOAKOAK77.317221717.800.014.531579.9
Drew BreesDrew Brees12/4/2005SDSDvsOAKOAK77.317221607.329.100.0212127.1
Results may be incomplete. StatMuse has complete game-level data for completion percentage and completions going back to the 1950 season.