Lahiri's score was highest of the week as he finished at nine-over 289, dropping 13 places from his overnight position.
Justin Thomas, meanwhile, grabbed a play-off over Luke List while Tiger Woods was 12th.
Lahiri had three birdies, the first of which came on the third.
He dropped a double on fifth followed by a bogey on sixth and another on ninth and turned in three over.
He birdied 12th on the back nine but once again had a bogey and double bogey on back-to-back holes 14th and 15th and not even a birdie on the tough 17th could better his day.
Thomas beat List on the first extra hole Sunday to win event. Thomas rose to No. 3 with this win.
Thomas and List finished at 8-under 272. It was the seventh playoff in 15 PGA TOUR events this season.
Thomas closed with a 2-under 68 and won for the second time this season. He also won in a playoff at the CJ Cup in South Korea last fall.
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