Peyton Manning had the most passing yards in 2003, with 4,267 yards.

passing yards leaders 2003
2003Manning2003Green2003Bulger2003Hasselbeck2003Johnson2003Brady2003Kitna2003Brooks2003Culpepper2003Maddox2003Favre2003Carter2003Delhomme2003McNabb2003McNair2003Collins2003Harrington2003Bledsoe2003Leftwich2003Garcia2003Blake2003Plummer2003Ramsey4.3k4.0k3.8k3.8k3.8k3.6k3.6k3.5k3.5k3.4k3.4k3.3k3.2k3.2k3.2k3.1k2.9k2.9k2.8k2.7k2.2k2.2k2.2k
NAMESEASONTMGPYDSCMPATTPCTAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Peyton ManningPeyton Manning2003INDIND164,26737956667.07.5266.7295.1101.81810799.0
Trent GreenTrent Green2003KCKC164,03933052363.17.7252.4244.6122.32013092.6
Marc BulgerMarc Bulger2003STLSTL153,84533653263.27.2256.3224.1224.13728881.4
Matt HasselbeckMatt Hasselbeck2003SEASEA163,84131351361.07.5240.1265.1152.94224688.8
Brad JohnsonBrad Johnson2003TBTB163,81135457062.16.7238.2264.6213.72011181.5
Tom BradyTom Brady2003NENE163,62031752760.26.9226.3234.4122.33221985.9
Jon KitnaJon Kitna2003CINCIN163,59132452062.36.9224.4265.0152.93724987.4
Aaron BrooksAaron Brooks2003NONO163,54630651859.16.8221.6244.681.53419588.8
Daunte CulpepperDaunte Culpepper2003MINMIN143,47929545465.07.7248.5255.5112.43719696.4
Tommy MaddoxTommy Maddox2003PITPIT163,41429851957.46.6213.4183.5173.34124275.3
Brett FavreBrett Favre2003GBGB163,36130847165.47.1210.1326.8214.51913790.4
Quincy CarterQuincy Carter2003DALDAL163,30229250557.86.5206.4173.4214.23718571.4
Jake DelhommeJake Delhomme2003CARCAR163,21926644959.27.2201.2194.2163.62316880.6
Donovan McNabbDonovan McNabb2003PHIPHI163,21627547857.56.7201.0163.3112.34325379.6
Steve McNairSteve McNair2003TENTEN143,21525040062.58.0229.6246.071.819108100.4
Kerry CollinsKerry Collins2003NYGNYG133,11028450056.86.2239.2132.6163.22816470.7
Joey HarringtonJoey Harrington2003DETDET162,88030955455.85.2180.0173.1224.095563.9
Drew BledsoeDrew Bledsoe2003BUFBUF162,86027447158.26.1178.8112.3122.54937173.0
Byron LeftwichByron Leftwich2003JAXJAX152,81923941857.26.7187.9143.3163.8199073.0
Jeff GarciaJeff Garcia2003SFSF132,70422539257.46.9208.0184.6133.32110480.1
Jeff BlakeJeff Blake2003ARIARI132,24720836756.76.1172.8133.5154.11913269.6
Jake PlummerJake Plummer2003DENDEN112,18218930262.67.2198.4155.072.3147391.2
Patrick RamseyPatrick Ramsey2003WASWAS112,16617933753.16.4196.9144.292.73020675.8
Chad PenningtonChad Pennington2003NYJNYJ102,13918929763.67.2213.9134.4124.02516082.9
Jay FiedlerJay Fiedler2003MIAMIA122,13817931457.06.8178.2113.5134.11912672.4
StatMuse has season-level data for passing yards going back to the 1932 season.